Section 18. Sequence Of Operation - Trane GAF2A0A36S3AEC Installer's Manual

Section 18. Sequence of Operation

18.1 Sequence of Operation
GAM2/GAF2 Sequence of Operation
NOTE: Models with a constant torque motor (5
ton / GAM2A0C60S5ASC) do not use blower relay
contacts 1 & 3 to energize the motor. The 24VAC
signal from the G wiring provides the necessary
power to energize the motor.
See unit and field wiring diagrams for additional
information.
Continuous Fan
1. R-G contacts close on comfort control sending
24VAC to the blower relay
2. Relay contacts 1 and 3 close.
3. The blower will now run on the selected speed.
Speed is field selectable.
Heatpump OD (cooling)
1. R-Y contacts close on the comfort control send-
ing 24VAC to the OD unit.
2. R-G contacts close on comfort control sending
24VAC to the blower relay
3. Relay contacts 1 and 3 close
4. The blower will now run on the selected speed.
Speed is field selectable
5. R-O contacts on the comfort control close
sending 24VAC to the switch over valve on the OD
unit.
Heatpump OD (heating)
1. R-Y contacts close on the comfort control
sending 24VAC to the OD unit.
2. R-G contacts close on comfort control sending
24VAC to the blower relay
3. Relay contacts 1 and 3 close.
4. The blower will now run on the selected speed.
Speed is field selectable.
Cooling OD
1. R-Y contacts close on the comfort control
sending 24VAC to the OD unit.
2. R-G contacts close on comfort control sending
24VAC to the blower relay
3. Relay contacts 1 and 3 close
4. The blower will now run on the selected speed.
Speed is field selectable
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