Aprilaire Model 8570 - Manual (Page 30)

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6. CHECK HEATING OPERATION
Notes:
1. To avoid the minimum off times during system
checkout, always start and end the check out
procedure in the OFF mode.
2. Do not operate heat pumps in the heating mode at high
outdoor temperatures for extended periods of time.
• Set the thermostat to the OFF mode.
• Set the thermostat to the HEAT mode:
– The B terminal will energize when in the Heat mode.
• Raise the heat setting to 5° higher than the room
temperature to initiate a 1st stage heat call. The mode
display will change from "HEAT MODE" to "HEATING",
which will flash when the thermostat is calling for heat:
– Furnace, Boiler: W1 (and G if GAS/ELEC dip switch is set
in the ELEC position) terminals will energize.
– Heat pumps: Y1 and G terminals will energize.
• Wait for 2nd Stage:
– Furnace, Boiler: Minimum-on time for 1st stage
is 2 minutes.
• W1, W2 (and G if GAS/ELEC dip switch set to the
ELEC position) will energize.
– Heat pumps: Minimum-on time for 1st stage is
4 minutes.
• Y1, W1 and G terminals will energize if
SINGLE/MULTI dip switch set to SINGLE and
ELEC/GAS dip switch set to ELEC.
• Y1, Y2 and G terminals will energize if SINGLE/MULTI
dip switch set to MULTI.
• W1 will energize if SINGLE/MULTI set to SINGLE and
ELEC/GAS set to GAS.
• Wait 4 minutes for 3rd Stage (multi-stage compressor heat
pump systems only):
– Y1, Y2, W1 and G terminals will energize if
SINGLE/MULTI set to MULTI and ELEC/GAS set to ELEC.
– W1 will energize if SINGLE/MULTI set to MULTI and
ELEC/GAS set to GAS.
• Set the thermostat to the OFF mode.