McQuay OM 920-1
27
Keypad/Display Menu Structure
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.
Min DAT Limit
is a status only item which indicates the discharge air low limit temperature
on CAV zone control units. Heating will be activated to maintain this setting when the
discharge temperature falls below it during the Fan Only operating state. On VAV or CAV
discharge control units, the minimum discharge temperature limit is the DAT Clg Spt.
Occ Heating
is an adjustable item which enables and disables the “daytime” heating mode of
operation. If the Occ Heating parameter is set to No, the unit will only go into heating during
the initial morning warm-up cycle. If the Occ Heating parameter is set to Yes, the unit can go
into the heating mode of operation any time during the day.
Energy Recovery
The Energy Recovery menu contains parameters that relate to or are used to control the
enthalpy wheel and exhaust fan when a unit is equipped with an optional energy recovery
wheel system.
Energy Rvcy
is an adjustable item which turns the optional energy recovery system on /off.
Wheel Speed
a status only item that indicates the energy wheel VFD speed.
Wheel Spd Cmd
is a status only item that indicates the current energy wheel VFD
commanded speed.
ER DAT
is status only item which displays the current discharge air temperature leaving the
optional energy recovery wheel.
ER Exh T
is status only item which displays the current exhaust air temperature leaving the
optional energy recovery wheel. Note: This sensor is present only when the unit is equipped
with the energy recovery wheel frost protection option
Min Exh T Diff
is an adjustable item that sets a differential below the calculated potential
energy recovery exhaust air frosting point. When the ER Exh T falls below the calculated
Table 16: Energy Recovery
Menu Display Name Item Display Name
Default Setting
Range
Password Level
Energy Recovery
Energy Rec=
Yes
No
6
Yes
Wheel Speed=
-
0-100%
6
Whl Spd Cmd=
-
0-100%
6
ER DAT=
-
-50.0-200.0°F
6
ER ExhT=
-
-50.0-200.0°F
6
Min ExhT Diff=
2.0°F
1.0-10.0°F
6
Max ExhT Diff=
6.0°F
1.0-10.0°F
6
Stage Time=
5min
1-100min
6
Min Off Time=
20min
1-100min
6
Rel Humidity=
-
0-100%
6
Min Whl Spd=
33%
0-100%
6
