Instruction manual

26 McQuay OM 920
Keypad/Display Menu Structure
Heating Menu
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 return temperature, space temperature or
outside air temperature. The unit goes into the heating mode of operation when the control
temperature is below the heating setpoint by more than ½ the deadband.
Zone Htg Spt is an adjustable item which sets the control temperature at which the unit will
go into the heating mode of operation.
Unocc Htg Spt is an adjustable item which sets the zone temperature at which the unit starts
up and provides unoccupied heating (night setback) during unoccupied periods.
MWUSpt is an adjustable item which sets the heating setpoint to be used during morning
warm up on a discharge temperature control unit.
DAT Htg Spt is an adjustable parameter which sets the heating discharge set point.
Htg Reset is an adjustable item used to set the type of heating reset to be used.
Min Htg Spt is an adjustable item which sets the minimum heating discharge set point for use
with a heating discharge air temperature set point reset schedule.
Min Htg Spt @ is an adjustable item which sets the value of the sensor input, selected with
the heating reset parameter, at which the heating setpoint is reset to the Min Htg Spt value.
Max Htg Spt is an adjustable item which sets the maximum heating discharge set point for
use with a heating discharge air temperature set point reset schedule.
Max Htg Spt @ is an adjustable item which sets the value of the sensor input, selected with
the heating reset parameter, at which the heating setpoint is reset to the Max Htg Spt value.
Min DAT Ctrl is an adjustable item used to activate or deactivate the low discharge
temperature limit function available on units equipped with modulating or multistage heat.
Table 15: Heating Menu
Menu Display Name Item Display Name Default Setting Range Password Level
Heating Zone Htg Spt= 68.0°F 0.0-100.0°F 6
Unocc Htg Spt= 55.0°F 40.0-100.0°F 6
MWUSpt= 70.0°F 40.0-100.0°F 6
DAT Htg Spt= 100.0°F 40.0-140.0°F 6
Htg Reset= None None 6
Ntwrk
Space
Return
OAT
ExtmA
ExtV
Min Htg Spt= 55.0°F 40.0-140.0°F 6
Min Htg Spt @ 0/ 0-100/ 6
NA NA
°F
°C
mA
Max Htg Spt= 55.0°F 40.0-140.0°F 6
Max Htg Spt @ 0/ 0-100/ 6
NA NA
°F
°C
mA
Min DAT Ctrl= Yes Yes/No 6
Min DAT Limit= 55.0°F 0.0-70.0°F 6
Occ Heating= Yes No 6
Yes