Thermo Pride Air Handlers ECM Blower 13/14 SEER (AH2) - Manual (Page 30)

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Sequence of Operation Glossary
Inputs:
W- Switched 24vac indicating a Heat call from the thermostat.
Y - Switched 24vac indicating a Cool call from the thermostat.
G - Switched 24vac indicating a call for blower operation from the thermostat.
DEHUM - Switched 24vac indicating a call for Dehumidification from a de-humidistat.
BLOWER Speeds:
HEAT - The Heating Blower speed selected by positions 1, 2 & 3 of SW1
(CFM tables on page 11-12)
COOL - The Cooling Blower speed selected by positions 4, 5 & 6 of SW1
(CFM tables on page 10)
LOW - The LOW Blower speed selected by positions 4, 5 & 6 of SW1
(CFM tables on page 10)
ECM – PSC Replacement for AH2436AE1 or AH4260AE1 only
In an emergency situation, a defective ECM motor can be replace with a PSC motor to provide temporary
circulating air flow for heating or cooling. This is done by replacing the ECM motor in the motor
mounting bracket with a PSC motor of similar Horsepower. Wire the common lead (typically white) of
the replacement PSC motor to the neutral (common) terminal on the fan control board (N - 1 through 7).
Connect the high-speed replacement PSC motor lead (typically black) to the EAC terminal on the fan
control board. The EAC contact is energized with 115VAC any time the control board is calling for fan
operation whether in heating or cooling mode. This replacement should be only used in emergency
situations and only until a replacement ECM motor can be obtained and reinstalled.
ECM – PSC Replacement for AH2436BE1 or AH4260BE1 - call Tech Service.