McQuay MPS020E Installation Manual
Operation and Maintenance Manual OM 843-2
MicroTech® II Unit Controls
For Maverick II™ Commercial Packaged
Rooftop Systems
Models MPS020E – 050E
20 to 50 Tons
R-410A Refrigerant
Group: Applied Systems
Part Number: OM 843
Date: August 2009
© 2009 McQuay International
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Agency Listed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Keypad/Display Menu Structure. . . . . . . . . . . . . . . 4
Menu Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Standard Menu Structure . . . . . . . . . . . . . . . . . . . 12
System Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Duct Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Bldg Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Stgd Exh Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Zone Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Disch Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Alarm Out Faults . . . . . . . . . . . . . . . . . . . . . . . . . 24
Alarm Problems . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Alarm Warning. . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Extended Menus . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Condenser Fans . . . . . . . . . . . . . . . . . . . . . . . . . 28
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Min OA Damper. . . . . . . . . . . . . . . . . . . . . . . . . . 29
Daily Schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Holiday Schedule. . . . . . . . . . . . . . . . . . . . . . . . . 32
One Event Sched . . . . . . . . . . . . . . . . . . . . . . . . 33
Optimal Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Time Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Time/Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Stgd Exh Fan Setup . . . . . . . . . . . . . . . . . . . . . . 35
Heating Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Cooling Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Operating Hours . . . . . . . . . . . . . . . . . . . . . . . . . 38
Manual Control . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Alarm Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Hidden Data Menus . . . . . . . . . . . . . . . . . . . . . . . . 41
Unit Configuration Setup Menu . . . . . . . . . . . . . . 41
Network Configuration . . . . . . . . . . . . . . . . . . . . . 42
Economizer Control . . . . . . . . . . . . . . . . . . . . . . . 43
Duct Static Pressure Control . . . . . . . . . . . . . . . . 43
Building Static Pressure Control . . . . . . . . . . . . . 44
Project Ahead Time - Zone Control . . . . . . . . . . . 44
Time Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Operating Hours Config Menu . . . . . . . . . . . . . . . 45
Remote Alarm Output Configuration . . . . . . . . . . 45
Alarm Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
General Description. . . . . . . . . . . . . . . . . . . . . . . 48
Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Unit Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Field Output Signal . . . . . . . . . . . . . . . . . . . . . . . 56
Field Input Signal. . . . . . . . . . . . . . . . . . . . . . . . . 57
Loading New Application Code . . . . . . . . . . . . . . 58
Typical Wiring Diagrams . . . . . . . . . . . . . . . . . . . . 60
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 managed, granted, and used by LonMark
International under a license granted by Echelon Corporation.
For installation and startup instructions and general information regarding a particular rooftop
unit, refer to the applicable model-specific 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 residential 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 grounded. 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.
2 McQuay OM 843-2
Keypad Functions
CAUTION
Extreme temperature hazard. Can cause damage to system components.
The MicroTech II controller is designed to operate in ambient temperatures
from -20°F to 125°F. It can be stored in ambient temperatures from -40°F to
140°F. 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 terminal blocks, relay modules, or power plugs while
power is applied to the panel.
Keypad Functions
The keypad consists of six keys to control the navigation of the cursor through the menus.
Figure 1: Keypad Controls
Menu ( =) – pressing this key at any location within 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 (
) – moves the cursor up the menu structure.
Down (
Right (
Left (
Enter (
this key after a field edit will also save the changed input value.
McQuay OM 843-2 3
) – moves the cursor down the menu structure.
) – moves the menu structure to the next available menu to the right.
) – moves the menu structure to the next available menu to the left.
) – pressing this key will allow the entry into a menu structure for editing. Pressing
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 Di
Economizer
Economizer Po s
Disch Air
DAT Clg Spt
Min OA Po s
Chgover Temp
Chgover Di
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 Cong
Daily Schedul e
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
Sat
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 Di
Ctrl Temp Src
OAT Htg Lock
OAT Lock Di
Stage Time
Cooling Setup
Unocc Clg Spt
Unocc Di
Ctrl Temp Src
OAT Clg Lock
OAT Lock Di
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
Keypad/Display Menu Structure
The following is a description of each menu and menu item within the rooftop MicroTech II
menu structure. Tables are included which show 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
4 McQuay OM 843-2
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 Spt
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 congured 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)
McQuay OM 843-2 5
Menu Summary
Menu Summary
Table 1 lists basic unit operating status and control 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
Off
Startup
Recirc
Fan Only
Min DAT
Heating
Econo
Cooling
Off Unocc
Unocc Op
Tnt Ovrd
Occ Op
Off Net
Off Alm
Off Man
Off Man Ctrl
Off Emerg
Off
Auto
Heat Only
Cool Only
Fan Only
Enabled
Off Man
Off Net
Off Alm
Off Amb
Enabled
None
Off Man
Of Net
Off Amb
Enabled
None
Off Man
Off Net
Off Amb
Normal
Shutdown
Off
Heat Only
Cool Only
Fan Only
Heat/Cool
System
Unit Status= -
Op Status=
Ctrl Mode= Off
Clg Status= -
Htg Status= -
Econo Status= -
Clg Capacity= - 0 - 100%
Htg Capacity= - 0 - 100%
OA Damper Pos= - 0 - 100%
Emerg Mode=
Appl Mode= Heat/Cool
-
6 McQuay OM 843-2
Table 1: Menu Summary (continued)
Menu Menu Item Default Range
Occupancy= -
Occ Mode= Auto
Occupancy
Occ Src=
Tnt Ovrd Time= 0 min 0 - 300
Disch Air= - -45 - 212
Temperatures
Duct Pressure
Bldg Pressure (Exh Fan
Ctrl=VFD)
StgdExh Fans (Exh Fan
Ctrl=Stgd)
Heating (Any Heat)
Mod Gas
Zone Cooling (CAV)
Return Air= - -45 - 212
Space Temp= - -45 - 212
OA Temp= - -45 - 212
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
Remote SF Cap= 25% 25 - 100
Exh Fan Cap= - 0 - 100
Bldg Press= - -.25 - .25
BldgSp Spt= .050IWC -.250 - .250
BSP DB= .010IWC .001 - .100
EF Cap Ctrl= Bldg Pres
Remote EF Cap= 25% 25 - 100
Exh Fan Cap= - 0 - 100
Control Temp= - -45 - 212
Heating Spt= 70°F 32 - 100
Heating DB 2.0°F 1.0 - 9.9
Heating Type=
Min DAT Ctrl=(VAV Only) No No/Yes
Min DAT Limit=(CAV Only) 55°F 32 - 99.9
Max DAT Spt= 105°F 50.0 - 120.0
Occ Heating=(VAV Only) Always MWU/Always
Disch Air=
DAT Htg Spt= 100°F 0.0 - 120.0
DAT Htg DB= 2.0°F 1.0 - 9.9
Control Temp= - -45 - 212
Cooling Spt= 75.0°F 40.0 - 99.0
Cooling DB= 2.0°F 1.0 - 9.9
Min DAT Setpt= 55.0°F 40.0 - 99.0
Menu Summary
Occ
Unocc
Tnt Ovrd
Auto
Occ
Unocc
Tnt Ovrd
Int Sched
Ts ta t
Remote Sw
Network
Occ Mode
DuctPres
Speed
Bldg Pres
Speed
None
2 Stg
4 Stg
ModLoGas
ModHiGas
Mod Water
McQuay OM 843-2 7
Menu Summary
Table 1: Menu Summary (continued)
Menu Menu Item Default Range
Disch Air= - -45 - 212
DAT Clg Spt= 55.0°F 50.0 - 99.0
Clg Reset= None
Discharge Cooling
(VAV )
Condenser Fans
Economizer (Automatic
or CAV)
Min OA Damper
Daily Schedule
DAT Clg DB= 2.0°F 1.0 - 9.9
Min Clg Spt= 55.0°F 50.0 - 99.0
Min Clg Spt @ 0.0 0.0 - 100.0
Max Clg Spt= 65.0°F 50.0 - 99.0
Max Clg Spt @ 100.0 0.0 - 100.0
Control Temp= - -45 - 212
Chgover Spt= 75.0°F 32.0 - 99.0
Chgover DB= 2.0°F 1.0 - 9.9
Cond Fan 2 Spt= - 0 - 104
Cond Fan 3 Spt= - 0 - 104
Cond Fan 4 Spt= - 0 - 104
Cond Fan Diff= 5.0°F 5 - 20
Economizer Pos= - 0 - 100
Disch Air= - -45 - 212
DAT Clg Spt= 55.0°F 50.0 - 99.0
Min OA Pos= - 0 - 100
Chgover Temp= 60°F 32.0 - 99.0
Chgover Diff= 10.0°F 5 - 20
Min OA Pos= - 0 - 100
Vent Limit= 20% 1 - 99
DCV Limit= 10% 1 - 99
Min OA Type= None
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
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
None
Network
Space
Return
OAT
Airflow
Ext mA
Ext V
None
Network
External
IAQ
8 McQuay OM 843-2
Table 1: Menu Summary (continued)
Menu Menu Item Default Range
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
Holiday Schedule
One Event Sched
Optimal Start
Setup
Time Settings
Time/Date
StgdExh Fan Setup
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
Beg= NA 00 @ 00:00 Jan-Dec 00:00 - 23:59
End= NA 00 @ 00:00 Jan-Dec 00:00 - 23:59
Enable= No No/Yes
Space Temp= - -45 - 212
OA Temp= - -45 - 212
Htg Rate= .400 .000 - .999
Htg OAT= 35°F -40 - 60
Design Htg OAT= 0°F -40 - 60
Clg Rate= .400 .000 - .999
Clg OAT= 85°F 60 - 140
Design Clg OAT= 95°F 60 - 140
AI1= RAT
Space T Present= Yes
Units= English
B09= Fan Op Output
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= - 00:00 - 23:59
Date= - Jan-Dec 0-31 2000-2009
Day= - Sunday - Saturday
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
Menu Summary
None
RAT
SpaceSpt
No
Yes
English
Metric
Fan Op Output
VAV O ut pu t
McQuay OM 843-2 9
Menu Summary
Table 1: Menu Summary (continued)
Menu Menu Item Default Range
Unocc Htg Spt= 55.0°F 32.0 - 99.0
Unocc Diff= 3.0°F 1.0 - 9.9
Heating Setup
Cooling Setup
Operating Hours
CtrlTemp Scr= Return
OAT Htg Lock= 2.0°F 1.0 - 99.0
OAT Lock Diff
Stage Time= 5 min 4 - 60
Unocc Clg Spt= 55.0°F 32.0 - 99.0
Unocc Diff= 3.0°F 1.0 - 9.9
CtrlTemp Scr= Return
OAT Clg Lock= 2.0°F 1.0 - 99.0
OAT Lock Diff=
Stage Time= 5 min 4 - 60
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
Return
Space
Return
Space
10 McQuay OM 843-2
Table 1: Menu Summary (continued)
Menu Menu Item Default Range
Manual Ctrl= Off
Supply Fan= Off
Comp # 1 = Off
Comp # 2 = Off
Comp # 3 = Off
Comp # 4 = Off
Cond Fan # 2 = Off
Cond Fan # 3 = Off
Heat # 1 = Off
Manual Control
Alarm Limits
Heat # 2 = Off
Heat # 3 = Off
Heat # 4 = Off
Exh Fan # 1 = Off
Exh Fan # 2 = Off
Alarm Out= Off
Vav/Fan Op Out= 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
Hi Disch Alm= 170 90 - 250
Lo Disch Alm= 40 20 - 50
Hi Return Alm= 120 90 - 150
Menu Summary
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
McQuay OM 843-2 11
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)
Standard Menu Structure
The Standard Menus are menu items 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
12 McQuay OM 843-2
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 Spt
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 congured 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.
McQuay OM 843-2 13
Standard Menu Structure
System Menu
The “System” menu provides a summary of basic unit status and control items. This menu
summarizes the current operating state of the unit, giving the operating 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
Off
Startup
Recirc
Unit Status= -
Op Status=
Ctrl Mode= Off
Clg Status= -
Htg Status= -
Econo Status= -
Clg Capacity= - 0 - 100%
Htg Capacity= - 0 - 100%
OA Damper Pos= - 0 - 100%
Emerg Mode= Normal
Off
Heat Only
Appl Mode=
Cool Only
Fan Only
Heat/Cool
Fan Only
Min Dat
Heating
Econo
Cooling
Off Unocc
Unocc Op
Tnt Ovrde
Occ Op
Off Net
Off Alrm
Off Man
Off Man Ctrl
Off Emerg
Off
Auto
Heat/Cool
Cool Only
Fan Only
Enabled
Off Man
Off Net
Off Alm
Off Amb
Enabled
None
Off Man
Of Net
Off Amb
Enabled
None
Off Man
Off Net
Off Amb
Normal
Shutdown
14 McQuay OM 843-2
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 state to another is also graphically 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 transition 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 the 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 unit 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 currently allowed. If cooling is disabled, the reason is indicated.
Htg Status= is a status only item which indicates whether or not heating is currently allowed.
If heating is disabled, the reason is indicated.
EconoStatus= is a status only item which indicates whether 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”.
McQuay OM 843-2 15
Standard Menu Structure
Occupancy
Menus in the Occupancy menu contain status and control items that relate to unit
occupied/unoccupied operation.
Table 3: Occupancy Menu
Menu Menu Item Default Range
Occupancy
Occupancy= is a status only item which indicates whether 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.
Occupancy= -
Occ Mode= Auto
Occ Src=
Tnt Ovrde Time= 120min 0 - 300
Occ
Unocc
Tnt Ovrd
Auto
Occ
Unocc
Tnt Ovrd
Int Sched
Ts ta t
Remote Sw
Network
Occ Mode
16 McQuay OM 843-2
Standard Menu Structure
Temperatures
Menus in the Temperatures menu contain unit temperature status information.
Table 4: Temperatures Menu
Menu Menu Item Default Range
Disch Air= - -45 - 212
Temperatures
Disch Air = is a status only item which displays the current temperature 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 temperature 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 space air temperature sensor input.
If an optional space temperature sensor 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 the current temperature reading from the unit
mounted outdoor air temperature sensor. This sensor is standard on all units.
Return Air= - -45 - 212
Space Temp= - -45 - 212
OA Temp= - -45 - 212
McQuay OM 843-2 17
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 control 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 ½ the deadband, the fan
speed will increase. Likewise if the duct static pressure is above the duct static pressure
setpoint by more than ½ the deadband the fan speed will decrease. Example - if the duct static
pressure setpoint is 1.2" and the deadband is 0.1", the duct static pressure must reach 1.14
before the fan will increase in speed.
Table 5: Duct Pressure Menu
Menu Menu Item Default Range
Duct Pressure
Supply Fan Cap= is a status only item which indicates 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 the location in which the duct static pressure tap
was field installed. This device is not factory installed.
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
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.
18 McQuay OM 843-2
Standard Menu Structure
Bldg Pressure
The Building Pressure menu provides a summary 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.
Table 6: Bldg Pressure Menu
Menu Menu Item Default Range
Exh Fan Cap= - 0 - 100
Bldg Press= - -.25 - .25
Bldg Pressure (Exh
Fan Ctrl=VFD)
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.
BldgSp Spt= .050IWC -.250 - .250
BSP DB= .010IWC .001 - .100
EF Cap Ctrl= Bldg Pres Bldg Pres Speed
Remote EF Cap= 25% 25 - 100
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 summary 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.
Table 7: Stgd Exh Fans Menu
Menu Menu Item Default Range
Stgd Exh Fans (Exh
Fan Ctrl=Stgd)
Exh Fan Cap= is a status only menu to indicate the capacity of the exhaust air fans.
Exh Fan Cap= - 0 - 100
McQuay OM 843-2 19
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 temperature 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 space temperature) is below the heating setpoint by more than ½
the deadband. Example - If the heating setpoint is 68.0°F and the deadband is 1.0°F, the unit
will not go into the heating mode of operation until the control temperature reaches 67.4°F.
When this occurs the heating mode of operation will begin and the 1st stage of heating
operation will start. The next stage 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 ½ the heating setpoint deadband. The
unit will stage down if the maximum discharge air temperature is reached. Units with one gas
valve have 2 stages of heating and units with two gas valves have 4 stages of heating.
Table 8: Heating Menu
Menu Menu Item Default Range
Heating (Any Heat)
Mod Gas
Control Temp= - -45 - 212
Heating Spt= 70°F 32 - 100
Heating DB 2.0°F 1.0 - 9.9
None
2 Stg
Heating Type=
Min DAT Ctrl (VAV
Only)=
Min DAT Limit (CAV
Only)=
Max DAT Spt= 105°F 50.0 - 120.0
Occ Heating (VAV
Only)=
Disch Air=
DAT Htg Spt= 100°F 0.0 - 120.0
DAT Htg DB= 2.0°F 1.0 - 9.9
No No/Yes
55°F 32 - 99.9
Always MWU/Always
4 Stg
ModLoGas
ModHiGas
ModWtr
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 deadband 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 option with a single furnace.
The furnace uses a two stage gas valve. 2) 4 Stg - is the high heat option with dual furnaces.
Each furnace uses a two stage valve. 3) ModLoGas - is the modulating low heat option with a
single furnace. The furnace uses a 25 - 100% modulating valve.4) ModHiGas - is the
modulating high heat option with dual furnaces. One furnace uses a 25 -100% modulating
valve and the other uses a 2 stage valve. 5) ModWtr - is the modulating hot water heat option.
Min DAT Ctrl (VAV Only)= is an adjustable item which sets the minimum that the discharge
air temperature can be. If the minimum is reached, the unit will stage up
20 McQuay OM 843-2
Standard Menu Structure
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 DAT reaches this temperature.
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 heating 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 the 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 unit is typically the space temperature. A space
temperature sensor must be field 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 ½ the deadband. Example - the
cooling setpoint is set to 70.0°F and the deadband is 1.0°F, the unit will not go into the cooling
mode of operation until the space sensor reaches 70.6°F. 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 cooling setpoint temperature 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 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 unit will stage down or
turn off the cooling mode of operation when the cooling setpoint reaches 69.4°F.
Table 9: Zone Cooling Menu
Menu Menu Item Default Range
Control Temp= - -45 - 212
Zone Cooling (CAV)
Cooling Spt= 75.0°F 32.0 - 99.0
Cooling DB= 2.0°F 1.0 - 9.9
Min DAT Spt= 55.0°F 40.0 - 99.0
Control Temp= is a status only item which indicates what the current control 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 discharge air temperature
allowed when the unit is in zone cooling. When the unit is in zone cooling the staging of
McQuay OM 843-2 21
Standard Menu Structure
compressors is controlled by the Cooling setpoint, 75°F. The unit controller is also analyzing
the discharge air temperature and will not allow operation below the Min DAT Spt.
Disch Cooling
The Discharge Cooling menu provides a summary to the cooling control parameters for units
with variable air volume (VAV) control. These 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 the change-over setpoint by more than ½ the
deadband. Example - If the change over temperature is 70.0°F and the deadband is 1.0°F, the
unit will not go into the cooling mode of operation until the return temperature reaches 70.6°F.
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 69.4°F.
Table 10: Disch Cooling Menu
Menu Menu Item Default Range
Disch Air= - -45 - 212
DAT Clg Spt= 55.0°F 50.0 - 99.0
Control Temp=
Chgover Spt= 75.0°F 32.0 - 99.0
Chgover DB= 2.0°F 1.0 - 9.9
None
Network
Spac e
Discharge Cooling
(VAV )
Clg Reset= None
DAT Clg DB= 2.0°F 1.0 - 9.9
Min Clg Spt= 80.0°F 50.0 - 99.0
Min Clg Spt @ 0.0 0.0 - 100.0
Max Clg Spt= 65.0°F 50.0 - 99.0
Max Clg Spt @ 35.0 0.0 - 100.0
Return
OAT
Airflow
Ext mA
Ext V
Disch Air= is a status only item which indicates what the current discharge air temperature is.
DAT Clg Spt= is an adjustable item which sets the 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.
22 McQuay OM 843-2
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