Instruction manual

McQuay OM 920 17
Keypad/Display Menu Structure
Temperature Menu
Menus in the Temperatures menu contain unit temperature status information.
Control Temp is a status only item which indicates what the current control temperature is.
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.
EFT/LCT (RTU) is a status only item which displays the current entering fan/leaving coil
temperature reading from the unit mounted temperature sensor. This sensor is available on
RTU units with dehumidification capability. This sensor is also installed on units equipped
with either gas or electric heat and is used by the controller to calculate the heat rise across the
heat exchanger by comparing it to the discharge air temperature input. The controller uses this
information to protect the heat exchanger against overheating.
EWT (SCU) is a status only item that displays the current temperature reading from the unit
mounted entering water temperature sensor. The sensor is standard on all water-cooled units.
MAT (SCU) is a status only item that displays the current temperature reading from the unit
mounted mixed air temperature sensor. The sensor is standard on all Self Contained units.
Table 6: Temperature Menu
Menu Display Name Item Display Name Default Setting Range Password Level
Temperatures Control Temp= - -50.0-200.0°F 6
Disch Air= - -50.0-250.0°F 6
Return Air= - -20.0-200.0°F 6
Space Temp= - -0.0-150.0°F 6
OA Temp= - -50.0-200.0°F 6
EFT/LC Temp= - -50.0-250.0°F 6
EW Temp= - -50.0-150.0°F 6
Mixed Air= - -50.0-250.0°F 6