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? 2008 mcquay international models mps030a ? 050a 30 to 50 tons r-410a refrigerant operation and maintenance manual om 843-1 microtech ii ? unit controls for maverick ii? commercial packaged rooftop systems group: applied systems part number: om 843 date: july 2008 free datasheet http://www.datasheet-pdf.com/
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contents introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 agency listed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 keypad functions . . . . . . . . . . . . . . . . . . . . . . . . . . 5 keypad/display menu structure. . . . . . . . . . . . . . . 6 menu summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 standard menu structure . . . . . . . . . . . . . . . . . . . 14 system menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 duct pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 bldg pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 stgd exh fans . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 zone cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 disch cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 alarm out faults . . . . . . . . . . . . . . . . . . . . . . . . . 26 alarm problems . . . . . . . . . . . . . . . . . . . . . . . . . . 27 alarm warning. . . . . . . . . . . . . . . . . . . . . . . . . . . 27 extended menus . . . . . . . . . . . . . . . . . . . . . . . . . . 28 password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 condenser fans . . . . . . . . . . . . . . . . . . . . . . . . . 30 economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 min oa damper. . . . . . . . . . . . . . . . . . . . . . . . . . 31 daily schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . 33 holiday schedule. . . . . . . . . . . . . . . . . . . . . . . . . 33 one event sched . . . . . . . . . . . . . . . . . . . . . . . . 34 optimal start . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 time settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 time/date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 stgd exh fan setup . . . . . . . . . . . . . . . . . . . . . . 36 heating setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 cooling setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 operating hours . . . . . . . . . . . . . . . . . . . . . . . . . 39 manual control . . . . . . . . . . . . . . . . . . . . . . . . . . 40 alarm limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 general description . . . . . . . . . . . . . . . . . . . . . . . 43 control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 unit controller . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 analog input . . . . . . . . . . . . . . . . . . . . . . . . . . 45 binary inputs . . . . . . . . . . . . . . . . . . . . . . . . . 46 fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 compressor control . . . . . . . . . . . . . . . . . . . . 46 power supply terminals . . . . . . . . . . . . . . . . 46 communication modules . . . . . . . . . . . . . . . . 46 bacnet/ip or bacnet ethernet . . . . . . . . . . . 47 bacnet ms/tp . . . . . . . . . . . . . . . . . . . . . . . . 47 lonworks scc . . . . . . . . . . . . . . . . . . . . . . . . 47 lonworks dac . . . . . . . . . . . . . . . . . . . . . . . . 47 keypad/display . . . . . . . . . . . . . . . . . . . . . . . 47 temperature sensors . . . . . . . . . . . . . . . . . . . 47 pressure transducers . . . . . . . . . . . . . . . . . . 47 actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 variable frequency drives (vfds) . . . . . . . . . 47 field wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 field output signal . . . . . . . . . . . . . . . . . . . . . . . 48 remote alarm output . . . . . . . . . . . . . . . . . . . 48 fan interlock . . . . . . . . . . . . . . . . . . . . . . . . . . 48 vav box output/fan operation output . . . . . 48 field input signal . . . . . . . . . . . . . . . . . . . . . . . . . 49 smoke detectors . . . . . . . . . . . . . . . . . . . . . . 49 external time clock . . . . . . . . . . . . . . . . . . . . 49 external discharge air temperature reset . . 49 space sensor . . . . . . . . . . . . . . . . . . . . . . . . . 49 free datasheet http://www.datasheet-pdf.com/
4 mcquay om 843-1 introduction introduction this manual provides information regarding the microtech ii ? control system used in the mcquay commercial packaged rooftop unit model mps product line. it specifically describes the operation and programmable options for units with constant air volume (cav) control and variable air volume (vav) control. agency listed note ? lonmark and the lonmark logo are manag ed, granted, and used by lonmark international under a license granted by echelon corporation. for installation and startup instructions and gene ral information regarding a particular rooftop unit, refer to the applicable model-speci fic installation and maintenance manual. notice this equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with this instruction manual, may cause interference to radio communications. it has been tested and found to comply with the limits for a class a digital device, pursuant to part 15 of the fcc rules. these limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. operation of this equipment in a resi dential area is likely to cause harmful interference in which case the user is required to correct the interference at his own expense. mcquay international disclaims any liability resulting from any interference or for the correction thereof. warning electric shock hazard. can cause personal injury or equipment damage. this equipment must be properly grou nded. connections and service to the microtech ii control panel must be performed only by personnel that are knowledgeable in the operation of the equipment being controlled. warning excessive moisture in the control panel can cause hazardous working conditions and improper equipment operation. when servicing this equipment during rainy weather, the electrical components in the main control panel must be protected from the rain. free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 5 keypad functions keypad functions the keypad consists of 6 keys to control th e navigation of the cursor through the menus. figure 1: keypad controls menu ( =) ? pressing this key at any location wi thin the menu structure (other than edit mode) will bring you to the beginning of the system menu. while in edit mode, pressing it twice will bring you to the system menu. up ( k ) ? moves the cursor up the menu structure. down ( l ) ? moves the cursor down the menu structure. right ( j ) ? moves the menu structure to the next available menu to the right. left ( ) ? moves the menu structure to the next available menu to the left. enter ( ) ? pressing this key will allow the entry into a menu structure for editing. pressing this key after a field edit will also save the changed input value. caution extreme temperature hazard. can cause damage to system components. the microtech ii controller is designed to operate in ambient temperatures from -20f to 125f. it can be stored in ambient temperatures from -40f to 140f. it is designed to be stored and operated in relative humidity up to 95% (non-condensing). caution static sensitive components. a static discharge while handling electronic circuit boards can cause damage to the components. discharge any static electrical charge by touching the bare metal inside the main control panel before performing any service work. never unplug any cables, circuit board term inal blocks, relay module s, or power plugs while power is applied to the panel. free datasheet http://www.datasheet-pdf.com/
6 mcquay om 843-1 keypad/display menu structure keypad/display menu structure the following is a description of each menu an d menu item within th e rooftop microtech ii menu structure. tables are included which s how every menu, item, and field in the menu structure of the program. these menus and items can all be displayed with the keypad/display. the keypad display menus are divided into two sections. the first section is the standard menus which do not require a password to gain access. the second section is the extended menus which do require a password (?4545?, see figure 2) to gain access. figure 2: keypad/display menu structure active alarm alarm log no more alarms press enter to clear alarm log standard menus occupancy occupanc y occ mode occ src tnt ovrd time system temperatures disch air return air space temp oa temp duct pressure (vav) supply fan cap duct pres s duct sp spt dsp db sf cap ctrl remote sf cap enter password for extended menus password = 4 5 4 5 condenser fan cond fan 2 spt cond fan 3 spt cond fan 4 spt cond fan diff economizer economizer po s disch air dat clg spt min oa po s chgover temp chgover diff min oa damper min oa po s vent limit dcv limi t design clg spd min clg spd loflo vent limit iaq ppm iaq spt iaq deadband min oa type ai3 config daily schedule holiday schedule hol 1 hol 2 hol 3 hol 4 hol 5 hol 6 hol 7 hol 8 hol 9 hol 10 hol 11 hol 12 mon tu e we d th u fr i sa t su n hol time/ date time date da y operating hours supply fa n exhaust fan mech cool comp # 1 comp # 2 comp # 3 comp # 4 heatin g economizer stgd exh fan setu p exh fan #1 on exh fan #1 of f exh fan #2 on exh fan #2 of f exh fan #3 on exh fan #3 of f tnt override heating setup unocc htg spt unocc diff ctrl temp src oat htg loc k oat lock diff stage time cooling setu p unocc clg spt unocc diff ctrl temp src oat clg lock oat lock diff stage time unit status op status ctrl mode clg status htg status econ status clg capacit y htg capacity oa damper pos ` emerg mode appl mode esc no more alarms press enter to clear all active alarms free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 7 keypad/display menu structure bldg pressure exh fan cap bldg pres s bldg sp sp t bsp db ef cap ctrl remote ef cap stgd exh fans (cav ) exh fan cap heating control temp heating spt heating db heating type heating cap zone cooling (cav ) control temp cooling spt cooling db min dat sp t disch cooling (vav ) one event sched beg end optimal star t enable space temp oa temp htg rate htg oat design htg oat clg rate clg oat design clg oat setu p ai1 space t present units bo 9 manual control supply fa n comp # 1 comp # 2 comp # 3 comp # 4 cond fan # 2 cond fan # 3 alarm ou t vav/ fan op out heat # 4 exh fan # 1 exh fan # 2 sup fan spd exh fan sp d oa damper pos manual control heat # 1 heat # 2 heat # 3 alarm limits hi disch alm lo disch alm hi return alm time settings service start up recirculate zero oa time tnt override post heat password notes 1. your display may not show all of these menus. only the menus that apply to this configured unit will be available. 2. hit return to scroll through changeable variable on the current page . 3. when no alarm is active, hitting the menu key when curser is at page header will return you to the system page. when any alarm is active, hitting the menu key will return you to the alarm page. 4. hitting the menu key when curser is not at page header will return you to the top of that page. disch air dat clg spt clg reset dat clg db control temp chgover sp t chgover db ` min dat ctrl (vav only) min dat limit (cav only) min dat spt occ heating (cav only) disch air (modulating only) dat mtg spt (mod. only) dat htg db (mod. only) free datasheet http://www.datasheet-pdf.com/
8 mcquay om 843-1 menu summary menu summary table 1 lists basic unit operating status and co ntrol set point parameters. the ?range? column in the table lists all possible values for each item. the factory settings for the adjustable parameters are shown in the ?default? column. table 1: menu summary menu menu item default range active alarm alarm log system unit status= - off startup recirc fan only min dat heating econo cooling op status= - off unocc unocc op tnt ovrd occ op off net off alm off man off man ctrl off emerg ctrl mode= off off auto heat only cool only fan only clg status= - enabled off man off net off alm off amb htg status= - enabled none off man of net off amb econo status= - enabled none off man off net off amb clg capacity= - 0 - 100% htg capacity= - 0 - 100% oa damper pos= - 0 - 100% emerg mode= normal shutdown appl mode= heat/cool off heat only cool only fan only heat/cool free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 9 menu summary occupancy occupancy= - occ unocc tnt ovrd occ mode= auto auto occ unocc tnt ovrd occ src= int sched ts ta t remote sw network occ mode tnt ovrd time= 0 min 0 - 300 temperatures disch air= - -45 - 212 return air= - -45 - 212 space temp= - -45 - 212 oa temp= - -45 - 212 duct pressure supply fan cap= - 0 - 100 duct press= - 0 - 5 ductsp spt= 1.00iwc .20 - 4.00 dsp db= 0.1iwc .02 - .400 sf cap ctrl= ductpres ductpres speed remote sf cap= 25% 25 - 100 bldg pressure (exh fan ctrl=vfd) exh fan cap= - 0 - 100 bldg press= - -.25 - .25 bldgsp spt= .050iwc -.250 - .250 bsp db= .010iwc .001 - .100 ef cap ctrl= bldg pres bldg pres speed remote ef cap= 25% 25 - 100 stgdexh fans (exh fan ctrl=stgd) exh fan cap= - 0 - 100 heating (any heat) control temp= - -45 - 212 heating spt= 70f 32 - 100 heating db 2.0f 1.0 - 9.9 heating type= none 2 stg 4 stg modlogas modhigas min dat ctrl=(vav only) no no/yes min dat limit=(cav only) 55f 32 - 99.9 max dat spt= 105f 50.0 - 120.0 occ heating=(vav only) always mwu/always mod gas disch air= dat htg spt= 100f 0.0 - 120.0 dat htg db= 2.0f 1.0 - 9.9 zone cooling (cav) control temp= - -45 - 212 cooling spt= 75.0f 40.0 - 99.0 cooling db= 2.0f 1.0 - 9.9 min dat setpt= 55.0f 40.0 - 99.0 table 1: menu summary (continued) menu menu item default range free datasheet http://www.datasheet-pdf.com/
10 mcquay om 843-1 menu summary discharge cooling (vav) disch air= - -45 - 212 dat clg spt= 55.0f 50.0 - 99.0 clg reset= none none network space return oat airflow ext ma ext v dat clg db= 2.0f 1.0 - 9.9 min clg spt= 55.0f 50.0 - 99.0 min clg spt @ 0.0 0.0 - 100.0 max clg spt= 65.0f 50.0 - 99.0 max clg spt @ 100.0 0.0 - 100.0 control temp= - -45 - 212 chgover spt= 75.0f 32.0 - 99.0 chgover db= 2.0f 1.0 - 9.9 condenser fans cond fan 2 spt= - 0 - 104 cond fan 3 spt= - 0 - 104 cond fan 4 spt= - 0 - 104 cond fan diff= 5.0f 5 - 20 economizer (automatic or cav) economizer pos= - 0 - 100 disch air= - -45 - 212 dat clg spt= 55.0f 50.0 - 99.0 min oa pos= - 0 - 100 chgover temp= 60f 32.0 - 99.0 chgover diff= 10.0f 5 - 20 min oa damper min oa pos= - 0 - 100 vent limit= 20% 1 - 99 dcv limit= 10% 1 - 99 min oa type= none none network external iaq xx.x% @ dcv limit 0 0 - 100 xx.x% @ vent limit 100 0 - 100 ext percent = - 0 - 100 0% @ xx v/ma 4 ma 0 - 20 100% @ xx v/ma 20 ma 0 - 20 xxxx ppm @ dcv limit 800 0 - 9999 xxxx ppm @ vent limit 1000 0 - 9999 xxxx ppm @ xx v/ma 0 4ma 0 - 9999 xxxx ppm @ xx v/ma 2000 20ma 0 - 9999 min clg spd= 40% 1 - 99 loflo vent limit= 30% 1 - 99 daily schedule mon= 00:00 - 00:00 00:00 - 23:59 tue= 00:00 - 00:00 00:00 - 23:59 wed= 00:00 - 00:00 00:00 - 23:59 thu= 00:00 - 00:00 00:00 - 23:59 fri= 00:00 - 00:00 00:00 - 23:59 sat= 00:00 - 00:00 00:00 - 23:59 sun= 00:00 - 00:00 00:00 - 23:59 hol= 00:00 - 00:00 00:00 - 23:59 table 1: menu summary (continued) menu menu item default range free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 11 menu summary holiday schedule hol 1= na 00 - na 00 jan-dec 0-31 hol 2= na 00 - na 00 jan-dec 0-31 hol 3= na 00 - na 00 jan-dec 0-31 hol 4= na 00 - na 00 jan-dec 0-31 hol 5= na 00 - na 00 jan-dec 0-31 hol 6= na 00 - na 00 jan-dec 0-31 hol 7= na 00 - na 00 jan-dec 0-31 hol 8= na 00 - na 00 jan-dec 0-31 hol 9= na 00 - na 00 jan-dec 0-31 hol 10= na 00 - na 00 jan-dec 0-31 hol 11= na 00 - na 00 jan-dec 0-31 hol 12= na 00 - na 00 jan-dec 0-31 hol 13= na 00 - na 00 jan-dec 0-31 hol 14= na 00 - na 00 jan-dec 0-31 hol 15= na 00 - na 00 jan-dec 0-31 hol 16= na 00 - na 00 jan-dec 0-31 one event sched beg= na 00 @ 00:00 jan-dec 00:00 - 23:59 end= na 00 @ 00:00 jan-dec 00:00 - 23:59 optimal start enable= no no/yes space temp= - -45 - 212 oa temp= - -45 - 212 htg rate= .400 .000 - .999 htg oat= 35f -40 - 60 design htg oat= 0f -40 - 60 clg rate= .400 .000 - .999 clg oat= 85f 60 - 140 design clg oat= 95f 60 - 140 setup ai1= rat none rat spacespt space t present= yes no yes units= english english metric b09= fan op output fan op output vav output time settings service= 0 min 0 - 240 start up= 180 sec 0 - 240 recirculate= 180 sec 120 - 3600 zero oa time= 90 min 0 - 240 tnt override= 120 min 0 - 300 post heat= 0 sec 0 - 180 password= 15 min 5 - 60 time/date time= - 00:00 - 23:59 date= - jan-dec 0-31 2000-2009 day= - sunday - saturday stgdexh fan setup exh fan # 1 on= 40% 0 - 99 exh fan # 1 off= 30% 0 - 99 exh fan # 2 on= 55% 0 - 99 exh fan # 2 off= 40% 0 - 99 exh fan # 3 on= 70% 0 - 99 exh fan # 3 off= 50% 0 - 99 table 1: menu summary (continued) menu menu item default range free datasheet http://www.datasheet-pdf.com/
12 mcquay om 843-1 menu summary heating setup unocc htg spt= 55.0f 32.0 - 99.0 unocc diff= 3.0f 1.0 - 9.9 ctrltemp scr= return return space oat htg lock= 2.0f 1.0 - 99.0 oat lock diff stage time= 5 min 4 - 60 cooling setup unocc clg spt= 55.0f 32.0 - 99.0 unocc diff= 3.0f 1.0 - 9.9 ctrltemp scr= return return space oat clg lock= 2.0f 1.0 - 99.0 oat lock diff= stage time= 5 min 4 - 60 operating hours supply fan= 000,000 0 - 999999 exhaust fan= 000,000 0 - 999999 mech cool= 000,000 0 - 999999 comp # 1 = 000,000 0 - 999999 comp # 2 = 000,000 0 - 999999 comp # 3 = 000,000 0 - 999999 comp # 4 = 000,000 0 - 999999 heating= 000,000 0 - 999999 economizer= 000,000 0 - 999999 tnt override= 000,000 0 - 999999 table 1: menu summary (continued) menu menu item default range free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 13 menu summary manual control manual ctrl= off on off supply fan= off on off comp # 1 = off on off comp # 2 = off on off comp # 3 = off on off comp # 4 = off on off cond fan # 2 = off on off cond fan # 3 = off on off heat # 1 = off on off heat # 2 = off on off heat # 3 = off on off heat # 4 = off on off exh fan # 1 = off on off exh fan # 2 = off on off alarm out= off on off vav/fan op out= off on off sup fan spd= 0.0% 0.0 - 100.0 exh fan spd= 0.0% 0.0 - 100.0 oa damper pos= 0.0% 0.0 - 100.0 htg mod vlv 0 0.0 - 100.0 alarm limits hi disch alm= 170 90 - 250 lo disch alm= 40 20 - 50 hi return alm= 120 90 - 150 table 1: menu summary (continued) menu menu item default range free datasheet http://www.datasheet-pdf.com/
14 mcquay om 843-1 standard menu structure standard menu structure the standard menus are menu it ems that control the unit's day to day operation. the menus provide information about the units operation and its control parameters. figure 3: keypad standard menu structure active alarm alarm log no more alarms press enter to clear alarm log standard menus system unit status op status ctrl mode clg status htg status econ status clg capacit y htg capacity oa damper pos ` emerg mode appl mode esc no more alarms press enter to clear all active alarms bldg pressure exh fan cap bldg pres s bldg sp sp t bsp db ef cap ctrl remote ef cap stgd exh fans (cav ) exh fan cap heating control temp heating spt heating db heating type heating cap min dat ctrl (vav only) min dat limit (cav only) min dat spt occ heating (cav only) disch air (modulating only) dat mtg spt (mod. only) dat htg db (mod. only) free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 15 standard menu structure occupancy occupanc y occ mode occ src tnt ovrd time temperatures disch air return air space temp oa temp duct pressure (vav) supply fan cap duct pres s duct sp spt dsp db sf cap ctrl remote sf cap zone cooling (cav ) control temp cooling spt cooling db min dat sp t disch cooling (vav ) disch air dat clg spt clg reset dat clg db control temp chgover sp t chgover db ` notes 1. your display may not show all of these menus. only the menus that apply to this configured unit will be available. 2. hit return to scroll through changeable variable on the current page . 3. when no alarm is active, hitting the menu key when curser is at page header will return you to the system page. when any alarm is active, hitting the menu key will return you to the alarm page. 4. hitting the menu key when curser is not at page header will return you to the top of that page. free datasheet http://www.datasheet-pdf.com/
16 mcquay om 843-1 standard menu structure system menu the ?system? menu provides a summary of basic unit status and control items. this menu summarizes the current operating st ate of the unit, giving the op erating state the unit is in, along with the current capacity level of that operating state. table 2: system menu menu menu item default range system unit status= - off startup recirc fan only min dat heating econo cooling op status= off unocc unocc op tnt ovrde occ op off net off alrm off man off man ctrl off emerg ctrl mode= off off auto heat/cool cool only fan only clg status= - enabled off man off net off alm off amb htg status= - enabled none off man of net off amb econo status= - enabled none off man off net off amb clg capacity= - 0 - 100% htg capacity= - 0 - 100% oa damper pos= - 0 - 100% emerg mode= normal normal shutdown appl mode= off heat only cool only fan only heat/cool free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 17 standard menu structure unitstatus= is a status only item which indicates the state of operation in which the unit is currently operating. the unit can be in any of the operating states shown in figure 4. figure 4: state diagram the transition from any operating st ate to another is also graphical ly represented in this figure. with a ?start up? command from an off state the unit will always go into the ?start up? state of operation for 3 minutes. next, it will trans ition into the ?recirculation? state of operation for another 3 minutes before finally going into the fan only state of operation. then, based on sensor inputs it will go into any of the 4 remaining states of operation - heating, cooling, economizer, or minimum discharge air heating. opstatus= is a status only item which indicates th e operating status of the unit. this menu item will indicate why the unit is running or why the unit is off. ctrl mode= is an adjustable item which allows the un it to be set for off, auto heating/cooling operation, cooling only, heating only, and fan only. clg status= is a status only item which indicates whether or not cooling (economizer and/or mechanical) is curren tly allowed. if cooling is di sabled, the reason is indicated. htg status= is a status only item which indicates wh ether or not heating is currently allowed. if heating is disabled, the reason is indicated. econostatus= is a status only item which indicates wh ether or not the economizer is enabled clg capacity= is a status only item which indicates the percentage of the unit maximum cooling capacity currently operating. htg capacity= is a status only item which indicates the percentage of the unit maximum heating capacity currently operating. oa damper pos= is a status only item which indicates the percentage that the outdoor damper is currently open. emergmode= is a status only item which indicates if the unit was shut down in an emergency situation. appl mode= is a network adjustable item which indicates that the unit is set for network off, cooling only, heating only, fan only or auto heating/cooling operation via a network signal. this item has no affect on the unit operation unless the ctrl mode= item is set to "auto." free datasheet http://www.datasheet-pdf.com/
18 mcquay om 843-1 standard menu structure occupancy menus in the occupancy menu contain status and control items that relate to unit occupied/unoccupied operation. occupancy= is a status only item which indicates whet her the unit is currently in an occupied, unoccupied, or tenant override mode of operation. occmode= is an adjustable item which allows the unit to be set for manual occupied or unoccupied operation, automatic operation based on a time schedule input or manual bypass operation. occsrc= is a status only item which indicates the input source or function that is responsible for setting the occupancy= parameter to ?occ?. tnt ovrd= is a status only item which indicates the amount of time remaining for unit operation since the tenant override button was activated. table 3: occupancy menu menu menu item default range occupancy occupancy= - occ unocc tnt ovrd occ mode= auto auto occ unocc tnt ovrd occ src= int sched ts ta t remote sw network occ mode tnt ovrde time= 120min 0 - 300 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 19 standard menu structure temperatures menus in the temperatures menu contain unit temperature stat us information. disch air = is a status only item which displays th e current temperatur e reading from the unit's discharge air temperature sensor (dat). this sensor is standard on all units. return air= is a status only item which displays the current temperatur e reading from the unit's return air temperature sensor (rat). this sensor is standard on all units. space temp= is a status only item which displays the current space (or zone) temperature reading from the optional unit sp ace air temperature sensor input. if an optional space temperature se nsor is not installed, the spacet present= item in the setup menu should be set to ?no? to disable the alarm function associated with an open circuit at the space temperature sensor input. oa temp= is a status only item which displays th e current temperature reading from the unit mounted outdoor air temperature sensor. this sensor is standard on all units. table 4: temperatures menu menu menu item default range temperatures disch air= - -45 - 212 return air= - -45 - 212 space temp= - -45 - 212 oa temp= - -45 - 212 free datasheet http://www.datasheet-pdf.com/
20 mcquay om 843-1 standard menu structure duct pressure the duct pressure menu provides a summary of the duct pressure items and parameters associated with variable air volume (vav) fan c ontrol units. this menu is only available on vav units. the supply air fan speed in controlled by a vfd that is mounted in the control cabinet. the control parameter for the fan speed is the duct static pressure setpoint. if the duct static pressure is below the duct static pressure setpoint by more than ? the deadband, the fan speed will increase. likewise if the duct static pressure is above the duct static pressure setpoint by more than ? the deadband the fan sp eed will decrease. exampl e - if the duct static pressure setpoint is 1.2" and the deadband is 0.1", the duct static pr essure must reach 1.14 before the fan will increase in speed. supply fan cap= is a status only item which indicat es the capacity of the supply air fan. duct press= is a status only item which indicates the current pressure of the supply air ductwork. the duct pressure is measured at th e location in which the duct static pressure tap was field installed. this de vice is not factory installed. duct sp spt= is an adjustable item which sets the duct static pressure set point used for controlling the vfd for the supply air fan. the vfd is modulated to maintain the duct pressure at this value. dsp db= is an adjustable item which sets a dead band around the ductsp spt= parameter. no duct static pressure control action is taken when the current duct static pressure input is within this dead band. sf cap ctrl= is an adjustable parameter to control supply air fan by duct pressure or by a percentage of supply air fan speed from 25% to 100%. the speed option is only used with a building automation system. remote sf cap = is an adjustable item for setting the supply fan speed by the keypad or by a network control signal. table 5: duct pressure menu menu menu item default range duct pressure supply fan cap= - 0 - 100 duct press= - 0 - 5 ductsp spt= 1.00iwc .20 - 4.00 dsp db= 0.1iwc .02 - .400 sf cap ctrl= ductpres ductpres speed remote sf cap= 25% 25 - 100 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 21 standard menu structure bldg pressure the building pressure menu provides a summar y of the control parameters for the exhaust fans. this menu is only available on units with exhaust fans. the building pressure control application can be on cav or vav units. exh fan cap= is a status only item which indicates the capacity of the exhaust air fans. bldg press= is a status only item which indicates the building static pressure at the building static pressure sensor location. bldg sp spt= is an adjustable item which sets the building static pressure set point used for controlling the exhaust fan vfd. the exhaust fan vfd is modulated to maintain the building static pressure sensor input at this set point. bsp db= is an adjustable item which sets a dead band around the bldgsp spt= parameter. no building static pressure control action is taken when the current building static pressure input is within this dead band. ef cap ctrl= is an adjustable parameter to control how the exhaust fans are to be controlled. the exhaust fans can be controlled by the building pressure or by a percentage of exhaust air fan speed from 25% to 100%. the speed option is only used with a building automation system. remote ef cap = is an adjustable item for setting the exhaust fan speed by the keypad or by a network control signal. stgd exh fans the staged exhaust fans menu provides a summar y of the control parameters for the exhaust fans. the staged exhaust fan control is only available on constant volume (cav) units. the capacity of the exhaust fans are controlled by the position of the economizer dampers. as the oa damper position is increased the exhaust fans will stage up increasing in exhaust airflow capacity. exh fan cap= is a status only menu to indicate the capacity of the exhaust air fans. table 6: bldg pressure menu menu menu item default range bldg pressure (exh fan ctrl=vfd) exh fan cap= - 0 - 100 bldg press= - -.25 - .25 bldgsp spt= .050iwc -.250 - .250 bsp db= .010iwc .001 - .100 ef cap ctrl= bldg pres bldg pres speed remote ef cap= 25% 25 - 100 table 7: stgd exh fans menu menu menu item default range stgd exh fans (exh fan ctrl=stgd) exh fan cap= - 0 - 100 free datasheet http://www.datasheet-pdf.com/
22 mcquay om 843-1 standard menu structure heating the heating menu provides a summary of the control parameters for units with heating. the unit's heating mode of operation is controlled by the control temperature and the heating setpoint temperature. the unit goes into the heating mode of operation by analyzing the control temperature. the control temperature can be either the return temperature or the space temperature. the return temper ature is typically used for vav units and the space temperature is typically used for cav units. the unit goes into the heating mode of operation when the control temperature (return or sp ace temperature) is below the heat ing setpoint by more than ? the deadband. example - if the h eating setpoint is 68.0f and the deadband is 1.0f, the unit will not go into the heating mode of operatio n until the control temper ature reaches 67.4f. when this occurs the heating mode of opera tion will begin and the 1st stage of heating operation will start. the next st age up/down will take place after 4 minutes. this ?4 minutes? is called the stage timer. the gas heat module will continue to stage up as long as the control temperature is below the heating setpoint by more than ? the heating setpoint deadband. the unit will stage down if the maximum discharge ai r temperature is reached . units with one gas valve have 2 stages of heating and units with two gas valves have 4 stages of heating. control temp= is a status only item which indicates what the current control temperature is. heating spt= is an adjustable item which sets the temperature in which the unit will go into the heating mode of operation. heating db= is an adjustable item which sets a d eadband around the heating spt= parameter. no heating control action (staging up or down) is taken when the control temperature is within this deadband around the setpoint. heating type= is a status only item. 1) 2 stg - is the low heat op tion with a single furnace. the furnace uses a two stage gas valve. 2) 4 st g - is the high heat option with dual furnaces. each furnace uses a two stage valve. 3) modlog as - is the modulating low heat option with a single furnace. the furnace uses a 25 - 100% modulating va lve.4) modhigas - is the modulating high h eat option with dual furnaces. one fu rnace uses a 25 -100% m odulating valve and the other uses a 2 stage valve. min dat ctrl (vav only)= is an adjustable item which sets the minimum that the discharge air temperature can be. if the minimu m is reached, the unit will stage up min dat limit (cav only)= is an adjustable item which sets the temperature on cav units in which the heating mode of operation will start if the da t reaches this temperature. table 8: heating menu menu menu item default range heating (any heat) control temp= - -45 - 212 heating spt= 70f 32 - 100 heating db 2.0f 1.0 - 9.9 heating type= none 2 stg 4 stg modlogas modhigas min dat ctrl (vav only)= no no/yes min dat limit (cav only)= 55f 32 - 99.9 max dat spt= 105f 50.0 - 120.0 occ heating (vav only)= always mwu/always mod gas disch air= dat htg spt= 100f 0.0 - 120.0 dat htg db= 2.0f 1.0 - 9.9 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 23 standard menu structure max dat spt= is an adjustable item which sets the maximum that the discharge air temperature can be. if this maximum is reached then the unit will stage down. occ heating (vav only)= is an adjustable item which allows a morning warm-up (mwu) cycle or an always heating mode cycle for the h eating mode of operation. if mwu is used the unit will only go into heating during the initial morning warm-up cycle. if always is selected the unit can go into the heating mode of operation any time of the day. disch air= is a measurement of the temperature at the discharge air sensor during the heating mode. it is used for modulating gas heat only. dat htg spt= is an adjustable item which sets the temperature of the discharge air when the unit is in heating mode. it is used for modulating gas heat only. dat htg db= is an adjustable item which sets a deadband around the dat htg spt= parameter. no heating control action (staging up or down) is taken when the control temperature is within this deadband around the setpoint. it is used for modulating gas heat only. zone cooling the zone cooling menu provides a summary of the cooling control parameters for units with constant air volume control only. these units are equipped with th e space comfort control (scc) software. the unit's cooling mode of operation is controlled by the control temperature and the cooling setpoint. the control temperature for a cav uni t is typically the space temperature. a space temperature sensor must be fiel d installed into the occupied space and connected to the unit controller. the unit goes into the cooling mode of operation when the control temperature (space temperature) is above the cooling setpoint by more than ? the deadband. example - the cooling setpoint is set to 70.0f and the deadband is 1.0f, the unit will not go into the cooling mode of operation until the space sensor reaches 70.6f. wh en this takes place the cooling mode of operation will begin and the 1st stage of compressor operation will start. the unit controller will turn on the next stage of co mpressor operation, or turn off a stage of compressor operation, to maintain the coolin g setpoint temperature within the deadband. when a compressor stage turns on, the next co mpressor stage up or do wn will not take place for the next 4 minutes. this ?4 minutes? is ca lled the stage time. reference the cooling setup menu for the adjustable stage time value. when a cooling stage is initiated no further operation will take place within the stage timer limit. in the above example the un it will stage down or turn off the cooling mode of operation wh en the cooling setpoint reaches 69.4f. control temp= is a status only item which indicates what the current cont rol temperature is. cooling spt= is an adjustable item which sets the temperature in which the unit will go into the cooling mode of operation. cooling db= is an adjustable item which sets a deadband around the cooling spt= parameter. no cooling control action (staging up or down) is taken when the control temperature is within this deadband around the setpoint temperature. min dat spt = is an adjustable item which sets the minimum discharg e air temperature allowed when the unit is in zone cooling. when the unit is in zone cooling the staging of compressors is controlled by the cooling setpoint, 75f. the unit controller is also analyzing the discharge air temperature and will not allow operation be low the min dat spt. table 9: zone cooling menu menu menu item default range zone cooling (cav) control temp= - -45 - 212 cooling spt= 75.0f 32.0 - 99.0 cooling db= 2.0f 1.0 - 9.9 min dat spt= 55.0f 40.0 - 99.0 free datasheet http://www.datasheet-pdf.com/
24 mcquay om 843-1 standard menu structure disch cooling the discharge cooling menu provides a summary to the cooling control parameters for units with variable air volume (vav) control. thes e units are equipped with the discharge air control (dac) software. the unit's cooling mode of operation is controlled by the control temperature, the change over temperature and the discharge air temperature. the unit goes into the cooling mode of operation by analyzing the control temperature. the control temperature for a vav system is the return temperature. the unit goes into the cooling mode of operation when the control temperature (return temperature) is above th e change-over setpoint by more than ? the deadband. example - if the change over temperat ure is 70.0f and the deadband is 1.0f, the unit will not go into the cooling mode of operatio n until the return temperature reaches 70.6f. when this takes place the cooling mode of operation will begin and the 1st stage of compressor operation will start. the unit controller will turn on the next stage of compressor operation, or turn off a stage of compressor operation, to maintain the discharge air temperature setpoint within the deadband. when a compressor stage turns on, the next compressor stage up or down will not take place for the next 4 minutes. this ?4 minutes? is called the stage timer. when a cooling stage is initiated no further operation will take place within the stage timer limit. reference the cooling setup menu for the adjustable stage time value. in the above example the unit will stage down or turn off the cooling mode of operation when the return temperature reaches 69.4f. disch air= is a status only item which indicates wh at the current discharge air temperature is. dat clg spt= is an adjustable item which sets th e temperature that the dat should be maintained at when it is in the cooling mode of operation. dat clg db= is an adjustable item which sets a deadband around the dat clg spt. no cooling control action (staging up or down) is taken when the dat is within this deadband around the setpoint temperature. control temp= is a status only item which indicates what the current control temperature is. chgover spt= is an adjustable parameter that puts the unit into the cooling mode of operation. chgover db= is an adjustable item which sets a deadband around the chgoverspt. clg reset= is an adjustable item that allows the da t to be reset based on one of the selected parameters. the setpoint is modulated between a minimum and maximum value at the respective conditions. table 10: disch cooling menu menu menu item default range discharge cooling (vav) disch air= - -45 - 212 dat clg spt= 55.0f 50.0 - 99.0 control temp= chgover spt= 75.0f 32.0 - 99.0 chgover db= 2.0f 1.0 - 9.9 clg reset= none none network space return oat airflow ext ma ext v dat clg db= 2.0f 1.0 - 9.9 min clg spt= 80.0f 50.0 - 99.0 min clg spt @ 0.0 0.0 - 100.0 max clg spt= 65.0f 50.0 - 99.0 max clg spt @ 35.0 0.0 - 100.0 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 25 standard menu structure figure 5 graphically shows the cooling reset operation. exam ple, the normal dat cooling setpoint is 55.0f. the cooling reset scheme is set to airflow. the unit is to adjust the dat from 55.0f to 65.0f. when the unit is at 35% of the design airflow the discharge temperature is to be 65.0f. when the unit is at 80% of its airflow the dat is to be 55.0f. this example would give the following inputs. min clg spt = 55.0f min clg spt @ = 80% max clg spt = 65.0f max clg spt @ = 35% based on the above, the unit will have a discha rge air temperature setpoint of 55.0f from 80% to 100% of the airflow. figure 5: cooling reset free datasheet http://www.datasheet-pdf.com/
26 mcquay om 843-1 alarms alarms alarms are divided into three categories - wa rnings, problems, and fa ults. these categories are prioritized with the warnings being the l east important and faults being of the highest importance. when a unit enters into a fault alarm, the unit shuts down and requires a manual reset before the unit will start again. fault alarms do not have an automatic reset to them. alarm out faults when the unit controller receives a fault alarm the unit responds by shutting down. emergency off= is a notification that the unit has been shut down on emergency. this is done by a network communication or an external devi ce. the external emergency off input is on tb2 at terminals 105 and 106. the return air smoke detector is on tb2 at terminals 104 and 105 and the supply air smoke detectors is on tb2 at terminals 103 and 104. all three external inputs are wired into the digital input id1 on the unit controller which controls this alarm. control t fail= is a notification that bo th the return air temperature and space temperature sensor are shorted or opened. disch sensor= is a notification that the discharge air temperature sensor (dat) has shorted or opened. alarm will clear when the dat sensor is replaced. duct hi limit= is a notification that the duct high limit (dhl) switch has tripped indicating that the duct static pressure has reached it s maximum of 3.5" wc. check all supply air ductwork dampers to confirm they are open. hi return tmp= is a notification that the rat sensor has indicated a return air temperature equal to that set up for the hireturnalm= parameter in the alarm limits menu. refer to the alarm limits menu for this temperature limit setting. hi disch tmp= is a notification that the dat sensor has indicated a discharge air temperature equal to that set up for the hidischalm= parameter in the alarm limits menu. refer to the alarm limits menu for this temperature limit setting. lo disch tmp= is a notification that the dat sensor has indicated a discharge air temperature equal to that set up for the lowdischalm= parameter in the alarm limits menu. refer to the alarm limits menu for this temperature limit setting. fan fail= is a notification that the proof of airflow switch (pc7) has not indicated any airflow. this can be caused by the belts being broken on the supply air fan. on cav units, if the airflow switch is open, the unit will gat a fan fail alarm. on vav units, the fan fail alarm will occur if the pc7 switch is open and the duct static pressure (as meas ured by sps1) is less than 1/2 of the setpoint. the duct static setpoint is ?ductsp spt=? found in table 5 on page 20. the pc7 switch is factory set a differential pressure of 0.25" 0.05". table 11: alarms menu menu alarm alarm faults emergency off= control t fail= disch sensor= duct hi limit= hi return tmp= hi disch tmp= lo disch tmp= fan fail= alarm problems oat sensor= space sensor= return sensor= hi pres-ckt1= hi pres-skt2= lo pres-ckt1= lo pres-ckt2= alarm warning dirty filter= free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 27 alarms alarm problems problem alarms will alter the unit operation by shutting down or a portion of its operation. oat sensor= is a notification that the outdoor air te mperature sensor (oat) has shorted or opened. the alarm will clear automati cally when the sensor is replaced. space sensor= is a notification that the space temperat ure sensor has shorted or opened. the alarm will clear automatically when the sensor is replaced. return sensor= is a notification that the return air temperature sensor (rat) has shorted or opened. the alarm will clear automati cally when the sensor is replaced. hi pres-ckt1= is a notification that the high refrigerant pressure switch has tripped and that the refrigerant pressure has exceeded 650 psi. this alarm will require a manual reset at the first condition of the alarm. this al arm is not an automatic reset. hi pres-ckt2= is a notification that the high refrigerant pressure switch has tripped and that the refrigerant pressure has exceeded 650 psi. this alarm will require a manual reset at the first condition of the alarm. this al arm is not an automatic reset. lo pres-ckt1= is a notification that the low refriger ant pressure switch has tripped and the unit could be low on re frigerant. this alarm will deactivate compressor circuit number 1 and require a manual reset after 3 attempts have been made in 24 hrs. lo pres-ckt2= is a notification that the low refriger ant pressure switch has tripped and the unit could be low on re frigerant. this alarm will deactivate compressor circuit number 2 and require a manual reset after 3 attempts have been made in 24 hrs. alarm warning warnings will only give a notification and will not shut the unit operation down. dirty filter= is a notification that the dirt y filter switch has tripped and the filters need to be changed. free datasheet http://www.datasheet-pdf.com/
28 mcquay om 843-1 extended menus extended menus the extended menus are menu items that are used to set up the unit for its hvac application. they are also used in serv icing the rooftop equipment. password accessing the extended menus requires the operator to enter the four-digit password ?4545?, (see figure 6) using the keypad buttons located on the controller interface. figure 6: keypad extended menu structure enter password for extended menus password = 4 5 4 5 condenser fan cond fan 2 spt cond fan 3 spt cond fan 4 spt cond fan diff economizer economizer po s disch air dat clg spt min oa po s chgover temp chgover diff min oa damper min oa po s vent limit dcv limi t design clg spd min clg spd loflo vent limit iaq ppm iaq spt iaq deadband min oa type ai3 config daily schedule holiday schedule hol 1 hol 2 hol 3 hol 4 hol 5 hol 6 hol 7 hol 8 hol 9 hol 10 hol 11 hol 12 mon tu e we d th u fr i sa t su n hol time/ date time date da y operating hours supply fa n exhaust fan mech cool comp # 1 comp # 2 comp # 3 comp # 4 heatin g economizer stgd exh fan setu p exh fan #1 on exh fan #1 of f exh fan #2 on exh fan #2 of f exh fan #3 on exh fan #3 of f tnt override heating setup unocc htg spt unocc diff ctrl temp src oat htg loc k oat lock diff stage time cooling setu p unocc clg spt unocc diff ctrl temp src oat clg lock oat lock diff stage time free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 29 extended menus one event sched beg end optimal star t enable space temp oa temp htg rate htg oat design htg oat clg rate clg oat design clg oat setu p ai1 space t present units bo 9 manual control supply fa n comp # 1 comp # 2 comp # 3 comp # 4 cond fan # 2 cond fan # 3 alarm ou t vav/ fan op out heat # 4 exh fan # 1 exh fan # 2 sup fan spd exh fan sp d oa damper pos manual control heat # 1 heat # 2 heat # 3 alarm limits hi disch alm lo disch alm hi return alm time settings service start up recirculate zero oa time tnt override post heat password notes 1. your display may not show all of these menus. only the menus that apply to this configured unit will be available. 2. hit return to scroll through changeable variable on the current page . 3. when no alarm is active, hitting esc ape when curser is at page header will return you to the system page. when any alarm is active, hitting esc ape will return you to the alarm page. 4. hitting escape when curser is not at page header will return you to the top of that page. htg mod vlv free datasheet http://www.datasheet-pdf.com/
30 mcquay om 843-1 extended menus condenser fans the condenser fan menu is used to set up the turning on and off of the condenser fans. the condenser fans are controlled by the outdoor air temperature. when compressor operation starts condenser fan #1 always comes on. cond fan 2 spt = is an adjustable item that turns condenser fan number 2 on when the outdoor temperature reach es this setpoint. cond fan 3 spt= is an adjustable item that turns condenser fan number 3 on when the outdoor temperature reach es this setpoint. cond fan 4 spt= is an adjustable item that turns condenser fan number 4 on when the outdoor temperature reaches th is setpoint. not all units have four condenser fans. cond fan diff= is an adjustable item that sets the temp erature differential with respect to the setpoint. economizer the economizer menu is used to set up the airside economizer operation. economizer pos= is a status only item that is used to indicate percentage that the economizer dampers are open. disch air= is a status only item that indicates the current discharge air temperature. dat clg spt= is an adjustable item which sets th e temperature that the dat should be maintained at. min oa pos= is a status only item which indicat es the current minimum position of the outdoor air damper (see ?min oa damper? on page 31). chgover temp= is an adjustable item which sets the oa dry bulb temperature at which the units changes over to the economizer operation. chgover diff= is an adjustable item which sets the te mperature differential with respect to the chgover temp. table 12: system summary menus menu menu item default range 030a 035a 040a 050a condenser fan cond fan 2 spt= 55 50 45 35 0 - 104 cond fan 3 spt= 80 80 60 55 0 - 104 cond fan 4 spt= n/a n/a 80 80 0 - 104 table 13: economizer menu menu menu item default range economizer (automatic or cav) economizer pos= - 0 - 100 disch air= - -45 - 212 dat clg spt= 55.0f 40.0 - 99.0 min oa pos= - 0 - 100 chgover temp= 60f 32.0 - 99.0 chgover diff= 2.0f 1 - 10 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 31 extended menus min oa damper the min oa damper menu is used to set up the minimum damper position. figure 7 shows a graphical explanation of the cont rol parameters. when a reset scheme is used (min oa type=) the oa damper position can be reset, or the damper can be closed to a position not lower than the demand control ve ntilation outdoor air damper position profile. figure 7: damper position vs. fan speed chart min oa pos= is a status only item which indicat es the current minimum position of the outdoor damper. this value does not go above a value called the ventilation limit and does not go below a value called the demand control ventilation limit. on cav units the ventilation limit and the demand control ventilation limit are fixed values set equal to the vent limit= and dcv limit= parameters. on vav units the oa damper position increases from the vent limit= value to the loflovent limit= value as the vfd speed goes from 100% down to the min clg spd= value. the demand control ventilation limit in this is determined by the ventilation limit x dvc limit=/vent limit=. when the min oa type= parameter is set to ?n one? the min oa pos= value is set to the ventilation limit. if min oa type= is set to network, external or iaq, the min oa pos= varies between the ventilation limit and the demand control ventilation limit as the reset signal varies from its maximum to minimum value. table 14: min oa damper menu menu menu item default range min oa damper min oa pos= - 0 - 100 vent limit= 20% 1 - 99 dcv limit= 10% 1 - 99 min oa type= none none network external iaq xxx% @ dcv limit= 0 0 - 100 xxx% @ vent limit= 100 0 - 100 ext percent= - 0 - 100 0% @ xx v/ma 4 ma 0 - 20 v/ma 100% @ xx v/ma 100% 1 - 100 min clg spd= 40% 1 - 99 loflo vent limit= 30% 1 - 99 10 20 30 40% 100% pp (minimum) min clg spd= (default 40%) demand control ventilation oa damper position lo flow vent limit= (default 30%) minimum outdoor air damper position vent limit= (default 20%) dcv limit= (default 10%) oa damper position % airflow free datasheet http://www.datasheet-pdf.com/
32 mcquay om 843-1 extended menus vent limit= is an adjustable item that sets the value of the ventilation limit on a cav unit or when a vav unit is at 100% discharge fan speed. dcv limit= is an adjustable item that sets the value of the demand control ventilation limit on a cav unit or when a vav unit is at 100% discharge fan speed. this item is only used when the ?min oa type=? is set to something other than ?none?. min oa type= is an adjustable item that sets the type of minimum oa damper position reset to be used. when this is set to ?none? the min oa pos= parameter is set to the ventilation limit. when this is set to ?network?, ?exter nal? or ?iaq? then the min oa pos= parameter varies from the ventilation limit down to the demand control ventilation limit as the reset signal goes from its maximum to minimum value. xxx % @ dcv limit= is an adjustable item used when min oa type= is set to ?external? to define at what percent of the field input si gnal the min oa pos= is to be at the demand control ventilation limit value. xxx % @ vent limit= is an adjustable item used when min oa type= is set to ?external? to define at what percent of the field input signal the min oa pos= is to be at the ventilation limit value. ext percent= is a status only item th at indicates what percent th e field signal currently is between the minimum and maximum value when min oa type= is set to ?external?. 0 % @ xx v/ma= is an adjustable item that sets the minimum dc voltage or ma value of the field signal used when min oa type= is set to ?external?. 100 % @ xx v/ma= is an adjustable item that sets the maximum dc voltage or ma value of the field signal used when min oa type= is set to ?external?. xxxx ppm @ dcv limit= is an adjustable item used wh en min oa type= is set to ?iaq? to define at what ppm value the min oa pos= is to be at the demand control ventilation limit value. xxxx ppm @ vent limit= is an adjustable item used when min oa type= is set to ?iaq? to define at what ppm value the min oa pos= is to be at the ventilation limit value. iaq ppm= is a status only item which indi cates the current reading from the co 2 sensor. xxxx ppm @ xx v/ma= is an adjustable item that sets the minimum ppm value and the minimum dc voltage or ma value of the co 2 sensor used when min oa type= is set to ?iaq?. xxxx ppm @ xx v/ma= is an adjustable item that sets the maximum ppm value and the maximum dc voltage or ma value of the co 2 sensor used when min oa type= is set to ?iaq?. min clg spd= is an adjustable item th at sets the discharge fan speed on a vav unit at which the ventilation limit reaches the loflovent= value. loflo vent limit= is an adjustable item that sets the maximum value for the ventilation limit on a vav unit. free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 33 extended menus daily schedule the daily schedule sets the start and stop times for each of the days of the week. one start and one stop time can be set for each day. holiday schedule the holiday schedule is used to set the start and stop times for up to 16 different holidays. to enter a 1-day holiday, the start date and the end date must both be entered as the same day. for example: to enter a holiday of july 4th, the date must be entered as ?jul 04 - jul 04?. if both the start and end dates are not entered, the unit will not recognize the holiday. the start and stop times for the holidays must be entered at the daily schedule menu (table 16). all 16 holidays will follow the start and stop times as indicated in the daily schedule for ?hol=?. table 15: daily schedule menu menu menu item default range daily schedule mon= 00:00 - 00:00 00:00 - 23:59 tue= 00:00 - 00:00 00:00 - 23:59 wed= 00:00 - 00:00 00:00 - 23:59 thu= 00:00 - 00:00 00:00 - 23:59 fri= 00:00 - 00:00 00:00 - 23:59 sat= 00:00 - 00:00 00:00 - 23:59 sun= 00:00 - 00:00 00:00 - 23:59 hol= 00:00 - 00:00 00:00 - 23:59 table 16: holiday schedule menu menu menu item default range holiday schedule hol 1= na 00 - na 00 jan-dec 0-31 hol 2= na 00 - na 00 jan-dec 0-31 hol 3= na 00 - na 00 jan-dec 0-31 hol 4= na 00 - na 00 jan-dec 0-31 hol 5= na 00 - na 00 jan-dec 0-31 hol 6= na 00 - na 00 jan-dec 0-31 hol 7= na 00 - na 00 jan-dec 0-31 hol 8= na 00 - na 00 jan-dec 0-31 hol 9= na 00 - n a00 jan-dec 0-31 hol 10= na 00 - na 00 jan-dec 0-31 hol 11= na 00 - na 00 jan-dec 0-31 hol 12= na 00 - na 00 jan-dec 0-31 hol 13= na 00 - na 00 jan-dec 0-31 hol 14= na 00 - na 00 jan-dec 0-31 hol 15= na 00 - na 00 jan-dec 0-31 hol 16= na 00 - na 00 jan-dec 0-31 free datasheet http://www.datasheet-pdf.com/
34 mcquay om 843-1 extended menus one event sched the one event schedule is used to set the start and stop times for one event. optimal start the optimal start menu is used to set up the unit so it starts at the most efficient time before building occupancy. enable= is an adjustable item that turns on the optimal start feature. setting the value to yes will activate this function. space temp= is a status only item that indicates the curren t space temperature. a space temperature sensor must be connected to the unit controller for this feature to function. refer to ?space sensor? on page 49. oa temp= is a status only item that indicates the current outdoo r air temperature. htg rate= is an adjustable item that sets the rate of temperature rise in degrees per minute when the unit was last started optimally in heating. htg oat = is an adjustable item that sets the ou tdoor air temperature wh en the unit was last started optimally in heating. design htg oat= is an adjustable item that sets th e outdoor air temperat ure at which the heating system could just ho ld the load. rate of temperature rise would equal zero. clg rate= is an adjustable item that sets the rate of temperature drop in degrees per minute when the unit last started optimally in cooling. clg oat= is an adjustable item that sets the outdoor air temper ature when the unit was last started optimally in cooling. design clg oat= is an adjustable item that sets th e outdoor air temperature at which the cooling system could just hold the load. rate of temperature rise would equal zero. table 17: one event sched menu menu menu item default range one event sched beg= na 00 @ 00:00 jan-dec 00:00-23:59 end= na 00 @ 00:00 jan-dec 00:00-23:59 table 18: opti mal start menu menu menu item default range optimal start enable= no no/yes space temp= - -45 - 212 oa temp= - -45 - 212 htg rate= .400 .000 - .999 htg oat= 35f -40 - 60 design htg oat= 0f -40 - 60 clg rate= .400 .000 - .999 clg oat= 85f 60 - 140 design clg oat= 95f 60 - 140 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 35 extended menus setup ai1= is an adjustable item to indicate what anal og input b1 is being used for, a return air temperature sensor (rat) or an adjustable space sensor setpoint. if a space senor is connected to the unit but it does not have an adjustable setpoint adjustment knob this item should be set to none. this connection is made at tb2 terminal 108. space t present= is an adjustable item to indicate if a space sensor is connected to the unit controller. units= is an adjustable item to indicate if the unit is to display english or metric units of measure. b09= is an adjustable item to conf igure binary output b09. this output can be configured for a fan operation output or a vav box output. time settings service= is an adjustable item that sets the am ount of time the unit can operate in manual control. startup= is an adjustable item that sets the ti me in seconds that the unit will perform its startup operation. recirculate= is an adjustable item that sets the time in seconds that the unit operates with only the fan, recirculating the building air. zero oa time= is an adjustable item that sets the ti me in minutes that the outdoor air damper stays at a zero position upon unit start up. tnt override= is an adjustable item that sets the amount of time that the unit will go into operation when the tenant override button is activated on the space sensor. post heat= is an adjustable item that sets the amo unt of time in seconds for the post heat operation. password= is an adjustable item that sets the amount of time in minutes that the unit will stay in the extended menus. table 19: setup menu menu menu item default range setup ai1= rat none rat spacespt space t present= yes no yes units= english english metric b09= fan op output fan op output vav output table 20: time settings menu menu menu item default range time settings service= 0 min 0 - 240 start up= 180 sec 0 - 240 recirculate= 180 sec 120 - 3600 zero oa time= 90 min 0 - 240 tnt override= 120 min 0 - 300 post heat= 0 sec 0 - 180 password= 15 min 5 - 60 free datasheet http://www.datasheet-pdf.com/
36 mcquay om 843-1 extended menus time/date time= is an adjustable item th at sets the current time. date= is an adjustable item that sets the current date. day= is an adjustable item that se ts the current day of the week. stgd exh fan setup the stgd exh fan setup is used to setup the operation of the exhaust fans for a cav application. this menu is used to select at wh at oa damper position each of the exhaust fans will turn on and off. exh fan #1 on= is an adjustable item that turns on exhaust fan #1 based on the economizer position. exh fan #1 off= is an adjustable item that turns off exhaust fan #1 based on the economizer damper position. exh fan #2 on= is an adjustable item that turns on exhaust fan #2 based on the economizer damper position. exh fan #2 off= is an adjustable item that turn of f exhaust fan #2 based on the economizer damper position. exh fan #3 on= is an adjustable item that turns on exhaust fan #3 based on the economizer damper position. exh fan #3 off= is an adjustable item that turn of f exhaust fan #3 based on the economizer damper position. table 21: time/date menu menu menu item default range time/date time= - 00:00 - 23:59 date= - jan-dec 0-31 2000-2009 day= - sunday - saturday table 22: stgd exh fan setup menu menu menu item default range stgdexh fan setup exh fan # 1 on= 40% 0 - 99 exh fan # 1 off= 30% 0 - 99 exh fan # 2 on= 55% 0 - 99 exh fan # 2 off= 40% 0 - 99 exh fan # 3 on= 70% 0 - 99 exh fan # 3 off= 50% 0 - 99 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 37 extended menus heating setup the heating setup menu is used to configure the heating operation of the unit. unocc htg spt= is an adjustable item that sets the temperature of the space sensor at which the heating operation will begi n when the building is unocc upied. the optional space sensor must be connected to the unit for this function to operate. unocc diff= is an adjustable item that sets the temp erature differential fo r the setpoint. when the space temperature goes above the unocc ht g spt plus the unocc diff, the unit will transition out of the heating mode of operation. ctrltemp src= is an adjustable item that sets the heating operation control source to either the space temperature sensor or th e return air temperature sensor. oat htg lock= is an adjustable item that sets th e maximum outdoor air temperature allowed for the heating mode of operation to take place. oat lock diff= is an adjustable item that sets the temperature differential for the oat htg lock setpoint. stage time= is an adjustable item that sets the tim er between each of the heating stages. the unit will not stage up or down until this time has passed. table 23: heating setup menu menu menu item default range heating setup unocc htg spt= 55.0f 55.0 - 99.0 unocc diff= 3.0f 1.0 - 9.9 ctrltemp scr= return return space oat htg lock= 60.0f 1.0 - 99.0 oat lock diff= 3.0f 1.0 - 9.9 stage time= 4 min 4 - 60 free datasheet http://www.datasheet-pdf.com/
38 mcquay om 843-1 extended menus cooling setup the cooling setup menus is used to configure the cooling operation of the unit. unocc clg spt= is an adjustable item that sets the temperature of the space sensor at which the cooling operation will begin when the building is unoccupied. the optional space sensor must be connected to the unit for this function to operate. unocc diff= is an adjustable item that sets the temp erature differential fo r the setpoint. when the space temperature falls below the unocc clg spt minus the unocc diff , the unit will go out of the cooling mode of operation. ctrltemp src= is an adjustable item that sets the c ooling operation control source to either the space temperature sensor or th e return air temperature sensor. oat clg lock= is an adjustable item that sets th e minimum outdoor air temperature allowed for the cooling mode of operation to take place. oat lock diff= is an adjustable item that sets the temperature differential for the oat clg lock setpoint. stage time= is an adjustable item that sets the tim er between each of the cooling stages. the unit will not stage up or down until this time has passed. table 24: cooling setup menu menu menu item default range cooling setup unocc clg spt= 55f 55.0 - 99.0 unocc diff= 3.0f 1.0 - 9.9 ctrltemp scr= return return space oat clg lock= 55.0f 1.0 - 99.0 oat lock diff= 2.0f 1.0 - 9.9 stage time= 4 min 4 - 60 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 39 extended menus operating hours the operating hours menu gives a summary of th e hours of operation for each of the supply fan, exhaust fan compressors, heating and economizer operation. supply fan= is a status item which gives the number of hours the supply fan has operated. exhaust fan= is a status item which gives the number of hours the exhaust fans have operated. mech cool= is a status item which gives the number of hours that mechanical cooling has operated. comp #1= is a status item which gives the number of hours that compressor #1 has operated. comp #2= is a status item which gives the number of hours that compressor #2 has operated. comp #3= is a status item which gives the number of hours that compressor #3 has operated. comp #4= is a status item which give the number of hours that compressor #4 has operated heating= is a status item which gives the number of hours that the heating mode has operated. economizer= is a status item which gives the nu mber of hours that the economizer has operated. tnt override= is a status item which gives the number of hours that the unit has operated in the tenant override mode of operation. table 25: operating hours menu menu menu item default range operating hours supply fan= 000,000 0 - 999,999 exhaust fan= 000,000 0 - 999,999 mech cool= 000,000 0 - 999,999 comp # 1= 000,000 0 - 999,999 comp # 2= 000,000 0 - 999,999 comp # 3= 000,000 0 - 999,999 comp # 4= 000,000 0 - 999,999 heating= 000,000 0 - 999,999 economizer= 000,000 0 - 999,999 tnt override= 000,000 0 - 999,999 free datasheet http://www.datasheet-pdf.com/
40 mcquay om 843-1 extended menus manual control the manual control of operation is a function that is used for operating the unit during a service call only. the unit must not be operated in this mode for any extended period of time. manual ctrl= is an adjustable item that puts the un it into manual control. major components of the unit are turned on and off by this co ntrol. the units normal control sequence are overridden in this state and can cause the unit to go into alarm. warning unit damage may occur when operating in manual control mode. run in this condition by an experienced technician only. warning operating the unit in manual control can cause personal injury or equipment damage. manual control operation must only be performed by personnel that are knowledgeable in the operation of the equipment. table 26: manual control menu menu menu item default range manual control manual ctrl= off on off supply fan= off on off comp # 1= off on off comp # 2= off on off comp # 3= off on off comp # 4= off on off cond fan # 2= off on off cond fan # 3= off on off cond fan # 4= off on off heat # 1= off on off heat # 2= off on off heat # 3= off on off heat # 4= off on off exh fan # 1= off on off exh fan # 2= off on off alarm out= off on off vav/fan op out= off on off sup fan spd= 0.0% 0.0 - 100.0 exh fan spd= 0.0% 0.0 - 100.0 oa damper= 0.0% 0.0 - 100.0 htg mod vlv= 0.0% 0.0 - 100.0 free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 41 extended menus supply fan= is an adjustable item that turns on the supply fan. note: turning on any one of the following compressors will automatically turn on condenser fan #1. other condenser fans must be manually turned on to control the head pressure of the unit. refrigerant gauges must be connected to the unit for observation of the head pressure in the manual control mode of operation. additional condenser fans must be turned on to maintain the head pressure. comp # 1= is an adjustable item th at turns on compressor #1. comp # 2= is an adjustable item th at turns on compressor #2. comp # 3= is an adjustable item th at turns on compressor #3. comp # 4= is an adjustable item that turns on compressor # 4 if unit has one. cond fan # 2= is an adjustable item that turns on the condenser fan #2. cond fan # 3= is an adjustable item that turns on the condenser fan #3. cond fan # 4= is an adjustable item that turns on the condenser fan #4 if unit has one. heat # 1= is an adjustable it em that turns on the first stage of heat. heat # 2= is an adjustable item that tu rns on the second stage of heat. heat # 3= is an adjustable item that turns on the third stage of heat. heat # 4= is an adjustable item that tu rns on the fourth stage of heat. exh fan # 1= is an adjustable item that turns on the first stage of exhaust fans. exh fan # 2= is an adjustable item that turns on the second stage of exhaust fans. sup fan spd= is an adjustable item only on vav units that sets the speed of the supply air fan. exh fan spd= is an adjustable item for units with building pressure control (vfd on the exhaust fans) that sets the speed of the exhaust fans. oa damper pos= is an adjustable item that sets the position of the outdoor damper. htg mod vlv= is an adjustable item that allows the valve to be adjusted from its minimum open position to its full open position. alarm limits the alarm limits menu is used to set the limits of the discharge air temperature sensor and the return air temperature sensor. hi disch alm= is an adjustable item that sets the high temperature limit for the dat sensor. when the discharge air temperature sensor reaches this set point the unit will go into the high discharge air alarm. lo disch alm= is an adjustable item that sets the low temperature limit for the dat sensor. when the discharge air temperature sensor reaches this set point the unit will go into the low discharge air alarm. hi return alm= is an adjustable item that sets the high temperature limit for the return air temperature. when the rat sensor reaches this se t point the unit will go into the high return air temperature alarm. table 27: alarm limits menu menu menu item default range alarm limits hi disch alm= 170.0f 90 - 250 lo disch alm= 40.0f 20 - 50 hi return alm= 120.0f 90 - 150 free datasheet http://www.datasheet-pdf.com/
42 mcquay om 843-1 controller controller this section of the manual describes the microtech ii controller components, input/output configurations, field wiring options and requirements, and service procedures. notice this equipment generates, us es, and can radiate radio frequency energy. if not installed and used in accordance with this instruction manual, it can interfere with radio communications. it has been tested and found to comply with the limits for a class a digital device, pursuant to part 15 of the fcc rules. these limits are designed to provide reas onable protection against harmful interference when the equipment is ope rated in a commercial environment. operation of this equipment in a resident ial area is likely to cause harmful interference; in which case users will be required to correct the interference at their own expense. mcquay international disclaims any liability resulting from any interference or for the correction thereof. warning electric shock hazard. can cause personal injury or equipment damage. this equipment must be pr operly grounded. connecti ons and service to the microtech ii control panel must be perf ormed only by personnel knowledgeable in the operation of the equipment being controlled. warning excessive moisture in the control panel can cause hazardous working conditions and improper equipment operation . protect the electrical comp onents in the main contro l panel from precipitation. caution extreme temperature can damage system components. this microtech ii controller is designed to operate in ambient temperatures from ?40f to 158f. it can be stored in ambient temperatures from ?65f to 176f. the controller is designed to operate in a 10% to 90% rh (noncondensing) and be stored in a 5% to 95% rh (noncondensing) environment. caution static sensitive components. a static discharge while handling electronic circuit boards can damage components. discharge any static electrical charge by touching the bare metal inside the main control panel before performing any service work. never unplug any cables, circuit board terminal blocks, relay modules, or power plugs while power is applied to the panel. caution to prevent possible unit damage, before removing power to the controller, pump down compressor. free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 43 controller general description the microtech ii controller for maverick commercial pack aged units is microprocessor- based and designed to provide sophisticated co ntrol of mcquay maverick rooftop units. in addition to providing normal temperature, st atic pressure, and ventilation control, the controller can provide alarm monitoring and al arm-specific component shutdown if critical system conditions occur. the operator can access temperatures, pressures, operating states, alarm messages, control parameters, and schedules with a 6-key keypad and a 4-line by 20-character display. the controller includes password pr otection against unauthorized or accidental control parameter changes. this microtech ii controller is capable of complete, stand-alone rooftop unit control, or it can be incorporated into a building-wide network using an optional plug-in communication module. available communicat ion modules include bacnet ? /ip, bacnet ms/tp, bacnet ethernet, l on m ark ? space comfort controller (scc) and l on m ark discharge air controller (dac). control panel the unit control panel?s main component is th e controller as indicated in figure 8. the controller along with the ancillary components of contactors, switches, motor protectors, and miscellaneous control items make up the complete unit control panel. free datasheet http://www.datasheet-pdf.com/
44 mcquay om 843-1 controller figure 8: control panel layout and description id ac t3 ah l cb10 cb51 cch1 - 4 da t dhl ds 1 f1a, b f1c hl hp1, 2 lp1, 2 m1 - 4 m10 m11 - 13 m51, 52 mcb mj mmp1 - 4 mmp10 mmp11 - 13 mmp51 oae oat pb1 pc5 pc7 r _hp1, 2 r _htr 1, 2 r _fanop r _vfd10 r _vfd51 rae rat rec1 sps1 sps2 t1 t2 tb1 tb2 tb51 vfd10 vfd51 te rminal block, exhaust fan distribution variable frequency drive, supply fan variable frequency drive, exhaust fans receptical, gfci static pressure sensors, duct static pressure sensors, building tr ans former, main control (line/115vac) tr ans former, control input (115/24vac ) te rminal block, internal distribution te rminal block, field relay, vfd enable, supply fa n relay, vfd enable, exhaust fans enthalpy sensor, return air te mperature sensor, return air pressure control, proof airf low swit ch relay, high pressure switch, circuits 1 & 2 relay, heater stages 1 & 2 relay, fan operation enthalpy sensor, outside air te mperature sensor, outside air power block, power distribution pressure control, dirty filter switch manual motor protector, compressors manual motor protector, supply fan manual motor protector, condenser fans motor protector, exhaust fan(s) contactor, condenser fans contactor, exhaust fans microprocessor circuit board mechanical jumper hi-pressure switch, refrigeration circuits 1, 2 low-pressure switch, re frigeration circuits 1, 2 contactor, co mpressors contactor, supply fan disconnect switch fuse, control circuit tr ans former (t 1), primary fuse, control circuit tr ans former (t 1), secondar y hi-lim it switch, gas heat circuit breaker, exhaust fan(s) crank case heater te mperature sensor, discharge ai r duct hi-limit, switch description actuator motor, economizer auxiliary hi-limit switch, g as heat, manual reset circuit breaker, supply fan tb1 r _ h p 1 r _ h t r 1 r _ v f d 1 0 r _ f a n o p t2 t1 pc5 pc7 dh l rec1 vfd10 m4 mmp 4 m2 m1 m3 mmp2 mmp1 mmp3 m11 mmp11 m12 mmp13 m13 mmp10 cb10 m10 pb1 tb 51 tb2 mcb r _ h p 2 r _ h t r 2 r _ v f d 5 1 f1 c/b/a vfd51 mmp51 cb51 m51 m52 ds1 sps1 sps2 field terminals factory wiring field wiring factory terminal s pl ug connector 200 / h200 wire/harness number shielded wire/ cable optional component id description free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 45 controller unit controller the unit controller is made up of the integral keypad with led display, digital inputs, digital outputs, analog inputs, and analog outputs. the mp s equipment has either a large or a medium unit controller depending if the rooftop unit has gas heat and a vav application or not. the difference between a large and a small unit controller is the number of inputs and outputs it has. see figure 9 for details on the unit controller. figure 9: unit controller analog input the unit controller receives up to 8 analog inputs. the sensors are described as follows: rx-/tx- rx+/tx+ gn d c1 no1 no2 no3 c1 c4 no4 no5 no6 c4 c7 no7 c7 no8 c8 nc8 no12 c12 nc12 no1 3 c13 nc1 3 c9 no9 no10 no1 1 c9 g g0 b1 b2 b3 gnd +vdc +v term gn d +5v re f b4 bc4 b5 bc5 vg vg0 y1 y2 y3 y4 id1 id2 id 3 id4 id5 id6 id7 id 8 idc1 b6 b7 b8 gn d id9 id 10 id11 id 12 idc9 id13 h id13 idc13 id14 id 14 h no1 4 c14 nc14 no15 c15 nc1 5 c16 no1 6 no17 no18 c1 6 e- e+ gnd id 15 h id 15 idc15 id 16 id 16 h y5 y6 id 17 id 18 idc1 7 b9 bc9 b1 0 bc1 0 j1 j24 j2 j3 field card serial card j4 j5 j6 j19 j7 j8 j20 service card j9 j10 j11 j21 j12 j13 j14 j15 j16 j22 j23 j17 j18 table 28: analog input controller input description b1 return air temperature sensor/space setpoint adjustment b2 space temperature sensor b3 outdoor air damper reset b4 discharge air temperature sensor b5 outdoor air temperature sensor b6 duct static pressure sensor b7 building static pressure sensor b8 remote discharge air temperature setpoint adjustment. field installed free datasheet http://www.datasheet-pdf.com/
46 mcquay om 843-1 controller binary inputs the unit controller receives up to 9 binary inputs. the devi ce description is as follows: fan control the supply air fan is controlled by the no1 output. this output is wired in with the fan interlock and relay r_vfd10 for vav units and relay m10 for cav applications. the exhaust fans are controlled by the no3 output for building pressure control applications. this output is wired to relay r_vfd51. for cav applications with staged control the exhaust fans are controlled by outputs no3 and no10. these outputs are wired to relays m51 and m52 respectively. compressor control the compressors are controlle d by the following outputs: these outputs are wired to relays m1 ~ m4 for compressor control. power supply terminals transformer t2 supplies 24 v (ac) power to the unit controller and connects at terminal g and go. the analog input power supply is also s upplied by t2 and is connected at vg and vgo. communication modules in systems that require networking, one of the following communication modules can be installed on the unit controller: ? bacnet/ip or bacnet ethernet ? bacnet ms/tp ? lonworks, space comfort control (scc) ? lonworks, discharge air control (dac) table 29: binary input controller input description id1 remote start/stop id2 emergency stop id3 proof of airflow switch id4 comparative enthalpy switch id5 dirty filter switch id6 low pressure switch, circuit 1 id7 high pressure switch, circuit 1, 2 id8 low pressure switch, circuit 2 id9 duct high limit switch table 30: binary output controller output description no6 compressor 1 no7 compressor 2 no12 compressor 3 no13 compressor 4 (040a - 050a units) free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 47 controller bacnet/ip or bacnet ethernet the bacnet/ip or bacnet ethe rnet communication module is designed to be an add on module to the unit controller. the microtech ii unit controller meets the requirements of ansi/ashrae 135-2001 standard. bacnet ms/tp the bacnet ms/tp communication module is designed to be an add-on module to the unit controller. the microtech ii unit controller meets the requirements of ansi/ashrae 135- 2001 standard for bacnet master slave/token passing protocol. lonworks scc the lonworks communication module is designed to be an add-on module to the unit controller. the scc module supports the lonmark space comfort controller functional number 8504. lonworks dac the lonworks communication module is designed to be an add-on module to the unit controller. the dac module supports the lonmark discharge air controller functional number 8610. the installation of each of the above communicat ion modules is further explained in each of the respective engineering and data (ed) documents. keypad/display the keypad display shown in figure 1 is the operator interface to the unit controller. the keypad has 6 function keys that provide the navigation. the display is a 4 line display with each line made up of 20 characters. all ope rating conditions, system alarms, control parameters, and schedules can be monitored from the keypad/display. temperature sensors the microtech ii controller uses passive negativ e temperature coefficien t (ntc) thermistors. these sensors vary their input resistance to the controller as the temperature changes. pressure transducers the microtech ii controller uses 0 to 5" wc , 4-20 ma static pre ssure transducers for measuring duct static pressure. if building static pressure control is provided, a ?0.25" wc to 0.25" wc, 4-20 ma static pressure transducer is used. actuators the actuators are controll ed by an analog signal from the unit controller. spring-return actuators are used for the 0 - 30% outdoor air and ec onomizer dampers. the mixing dampers are normally closed to the outside air. variable frequency drives (vfds) when controlling the supp ly air fan or the exhaust fans with a variable frequency drive, the microtech ii controller uses an analog ou tput signals to modulate the drive speed. free datasheet http://www.datasheet-pdf.com/
48 mcquay om 843-1 field wiring field wiring field output signal the following output signals may be availabl e for field connections to a suitable device. ? remote alarm output ? fan interlock ? vav b o x o u t p u t the remote alarm output and fan operation ou tput are available on all units. the vav box output is available only on vav units. remote alarm output the remote alarm output, dry contact no8, clos es when the unit controller has an active alarm. to use this signal wire a field supplie d 24 v (ac) relay/contact across terminals 120 and 122 on tb2. this and additional wiring information can be seen on the output wiring schematics at line number 334. fan interlock the output terminal on the unit controller, no1, is energized when the supply fan is on. this output is wired to tb2 at terminals 118 and 119. all units should have a mechanical jumper (mj118) installed at these terminals. this output supplies 115 v (ac) to these terminals. a fan interlock switch can be installed at this location to control the start of the fan. this and additional wiring information can be seen on the output wiring schematics at line number 303. vav box output/fan operation output this output is designed to coordinate the unit operation with vav box control. the output terminal on the unit controller, no9, is ener gized and provides 24 v (ac) to the relay r_fanop. the normally open contacts of this relay are wired to tb2 at terminals 124 and 125. this and additional wiring information can be seen on the output wiring schematics at line number 336. free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 49 field wiring field input signal the following field supplied input devices may be integrated with the unit's operation by the unit controller. ? return and/or supply air smoke detectors ? external time clock ? external discharge air temperature reset signal smoke detectors field installed smoke detectors in the return air ductwork or the supply air ductwork can be coordinated with the units operation through the uni t controller's binary input, id2. this input in wired to tb2 and the supply air smoke det ector can be wired between terminals 103 and 104 and the return air smoke detector can be wired between terminals 104 and 105. the t2 transformer supplies 24 v (ac) across each of th ese terminals and a dry set of contacts can be wired to these terminals respectively. this and additional wiring inform ation can be seen on the input wiring schematics at line number 217. external time clock an external time clock can control the units o ccupied and unoccupied cycles by wiring it to the unit controller. a dry set of contacts can be wired between terminals 101 and 102 on tb2. the t2 transformer supplies 24 v (ac) across these contacts. this and additional wiring information can be seen on the input wiring schematics at line number 215. external discharge air temperature reset an external device on vav units can reset the discharge air temperature. the input on the unit controller is at b8 and is wired to terminals 112 and 113 on tb2. the control signal can be 0- 10 v (dc) or a 0-20 ma. the unit controller must be set up for the correct control signal under the discharge cooling menu. see table 10 on page 19 for further discussions. when this option is used the dat can be reset between the minimum and maximum cooling set points as configured at the discharge cooling menu. ex ample, for a 0-10 v (dc) control signal the controller configuration would be as follows for a discharge air temperature reset scheme between 55.0f and 65.0f. clg reset = ext v min clg spt = 55.0f min clg spt @ = 0 (0 v (dc)) max clg spt = 65.0f max clg spt @ = 10 (10 v (dc)) the above setting will vary the discharge air temperature setpoint between 55.0 - 65.0f with a control signal of 0 - 10 v (dc)). space sensor cav units may require the use of a space sensor . vav units only require a space sensor if unoccupied heating and/or cooling is required. the space sensor be one of the two options: 1 space sensor with tenant override. 2 space sensor with tenant override and se tpoint adjustment (for cav units only). the space senor with tenant override is connected to the unit at tb2 on terminals 109 and 110. the space sensor with tenant override and setpoi nt adjustment in connect ed to the unit at tb2 on terminals 108, 109, and 110. when the setpoint adjustment option is used the return air temperature sensor must be disconnected. free datasheet http://www.datasheet-pdf.com/
50 mcquay om 843-1 field wiring figure 10: vav power free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 51 field wiring free datasheet http://www.datasheet-pdf.com/
52 mcquay om 843-1 field wiring figure 11: vav control?inputs free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 53 field wiring free datasheet http://www.datasheet-pdf.com/
54 mcquay om 843-1 field wiring figure 12: vav control?outputs free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 55 field wiring free datasheet http://www.datasheet-pdf.com/
56 mcquay om 843-1 field wiring figure 13: cav power free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 57 field wiring free datasheet http://www.datasheet-pdf.com/
58 mcquay om 843-1 field wiring figure 14: cav control?inputs free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 59 field wiring free datasheet http://www.datasheet-pdf.com/
60 mcquay om 843-1 field wiring figure 15: cav control?outputs (staged) free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 61 field wiring free datasheet http://www.datasheet-pdf.com/
62 mcquay om 843-1 field wiring figure 16: cav control?outputs (modulating) free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 63 field wiring free datasheet http://www.datasheet-pdf.com/
64 mcquay om 843-1 field wiring figure 17: electric heat option power free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 65 field wiring free datasheet http://www.datasheet-pdf.com/
66 mcquay om 843-1 field wiring figure 18: electric heat option?outputs free datasheet http://www.datasheet-pdf.com/
mcquay om 843-1 67 field wiring free datasheet http://www.datasheet-pdf.com/
? 2008 mcquay international ? www.mcquay.com ? 800-432-1342 mcquay training and development now that you have made an investment in modern, efficien t mcquay equipment, its care should be a high priority. for training information on all mcquay hvac products, pleas e visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the training department. warranty all mcquay equipment is sold pursuant to its standard terms and conditions of sale, including limited product warranty. consult your local mcquay representative for wa rranty details. refer to form 933-43285y. to find your local mcquay representative, go to www.mcquay.com. this document contains the most current product informati on as of this printing. for the most up-to-date product information, please go to www.mcquay.com. free datasheet http://www.datasheet-pdf.com/

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