Crown CSHB60-90XE operation manual Sequence of Operation Glossary, ECM - PSC Replacement

All installations and services must be performed by qualified service personnel.

Sequence of Operation Glossary

Inputs: LIMIT - 120vac power from the High Limit Switch used to power the burner. 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 6) COOL - The Cooling Blower speed selected by positions 4, 5 & 6 of SW1 (CFM tables on page 6) LOW - The LOW Blower speed selected by positions 4, 5 & 6 of SW1 (CFM tables on page 6)

ECM – PSC Replacement

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.

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