Instruction manual

McQuay OM 920 23
Keypad/Display Menu Structure
Economizer Menu
Economizer Pos is a status only item that is used to indicate percentage that the economizer
dampers/waterside economizer valve is open.
DAT Clg Spt is an adjustable item used by the controller to set the DAT cooling setpoint. This
value is adjustable only when it is not being set by a reset schedule.
Min OA Pos is a status only item which indicates the current minimum position of the
outdoor air damper.
Chgover Temp is an adjustable item which sets the OA dry bulb temperature at which the
units changes over to the economizer operation.
EWT Diff is an adjustable item that sets a differential below the MAT at which waterside
economizer operation is enabled based on entering water temperature.
Table 13: Economizer Menu
Menu Display Name Item Display Name Default Setting Range Password Level
Economizer Economizer Pos= - 0-100% 6
DAT Clg Spt= 55.0°F 40.0-100.0°F 6
Min OA Pos= - 0-100% 6
Chgover Temp= 55.0°F 0.0-100.0°F 6
EWT Diff= 3.0d°F 0.0-10.0d°F 6