Mode Of Operation - Daikin McQuay 668811101 Operation & Application Manual

3. Press PROG to select program or non-program option.
Once the thermostat is installed, it should be thoroughly tested.
Do not energize the air conditioning system when the outdoor temperature is below 50 degrees.
Cool Test
1. Press mode button until cool mode is displayed.
2. Adjust set temperature so it is 5 degrees below room temperature.
3. Air conditioning should come on. Green LED turns ON.
4. Adjust the set temperature 2 degrees above the room temperature and the A/C should
turn off. There may be a fan delay on your system.
Note: There is a four-minute time delay to protect the compressor after it turns off.
Heat Test
1. Press mode button until heat mode is displayed.
2. Adjust the set temperature so it is 5 degrees above the room temperature.
3. Heat should come on. Red LED turns ON.
4. Adjust the set temperature 2 degrees below the room temperature and the heat
should turn off. There may be a fan delay on your system.
Note: For heat pumps, there is a four-minute delay to protect your compressor.
Fan Test
1. Slide fan switch to ON position.
2. Slide fan switch to Auto position.
The McQuay 668811101 thermostat is a programmable, auto changeover, single stage heat, single stage cool
thermostat. It functions with air conditioning, heat pumps, gas, oil or electric heat systems.
The thermostat activates the heating appliance when the room temperature is below the set heat temperature
(by the differential temperature) and the red indicator light on the thermostat will light. The McQuay 668811101
thermostat will stop outputting and the red light will turn off when the call for heat has been satisfied. With heat
pumps, the thermostat will not let the compressor come on for 4 minutes after it turns off. This protects your
compressor.
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Testing the Thermostat
CAUTION
It can result in equipment damage or personal injury.
Indoor fan turns ON.
Indoor fan turns OFF.

Mode of Operation

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