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Mode of Operation
The McQuay Auto-changeover Electronic Thermostat is a two-stage heat, two-stage cool thermostat.
The thermostat activates the first stage of heating when the room temperature is below the heat set
temperature (by the differential temperature). The second stage of heating will be activated if the room
temperature continues to drop. The heat outputs are staged off (configurable, setting 7, Page 9) as the
room temperature increases.
When the room temperature is greater than the cool set temperature (by the differential temperature), the
cooling device is activated. The second stage of cooling will be activated if the room temperature continues
to rise. The cool outputs are staged off (configurable, setting 7, Page 9) as the room temperature drops.
The thermostat has the following operating modes: OFF, Heat, Cool and Auto. In OFF mode, the thermostat
will not turn on heating or cooling devices. In the Heat mode, the thermostat controls the heating system. In
the Cool mode, the thermostat controls the cooling system. In the Auto mode, the thermostat operates as
an auto-changeover thermostat. It will turn on heating or cooling as required. The indoor fan can be turned
on in all operating modes using the Fan switch.
Pressing the and buttons simultaneously for 2 seconds causes the thermostat to output from the
“O” terminal for 5 seconds. “ ” will show on the display. This will result in the unit going into a night set-
back override.
Pressing the and buttons simultaneously for 10 seconds causes the thermostat to output from the “O”
terminal for 15 seconds. “ ” will show on the display. This will result in the unit being reset.
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