Aprilaire 8570, Safety And Installation Instructions Manual

Page: 32 / 40

- 28 -
7. CHECK COOLING OPERATION
Notes:
1. To avoid the minimum off times during system
checkout, always start the check out procedure
in the OFF mode.
2. Do not operate air conditioning at low outdoor
temperatures. Refer to equipment manufacturer’s
recommendations for safe operating temperatures.
• Set the thermostat to the OFF mode.
• Set the thermostat to the COOL mode:
– The O terminal will energize when in the Cool mode.
• Lower the cool setting to 5° below the room temperature
to initiate a 1st stage cool call. The mode display will
change from “COOL MODE” to “COOLING”, which will flash
when the thermostat is calling for cooling:
– Y1 and G terminals will energize.
• Wait 4-minutes for 2nd Stage:
– Y1, Y2 and G terminals will energize.
• Set the thermostat to the OFF mode.
Symptom Cause
Thermostat does not call for cooling
Minimum-off times. Change the mode to OFF first, then change the mode
to COOL and make a call for cooling.
Cooling does not come on at all
RC terminal not connected – see wiring diagrams.
Cooling equipment power not on.
Heat comes on instead of cooling
Reversing valve wiring.
Miswiring – check wire colors at thermostat and HVAC equipment.
TROUBLESHOOTING – COOLING OPERATION