Section 18. Sequence Of Operation; Section 19. Checkout Procedures - Trane GAF2A0A36S31EE Installer's Manual

Section 18. Sequence of Operation

18.1 Sequence of Operation
GAF2 Sequence of Operation
See unit, electric heat, 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 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.

Section 19. Checkout Procedures

19.1 Operational And Checkout Procedures
Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance,
all units must be operated and charge adjustments made in accordance with procedures found in the Service
Facts of the Outdoor Unit.
After installation has been completed, it is recommended that the entire system be checked against the following list:
1. Be sure unit suspension (if used) is secure and that there
are no tools or loose debris in or around or on top of the
unit. .............................................................................. [ ]
2. Properly insulate suction lines and fittings. .................. [ ]
3. Properly secure and isolate all refrigerant lines. .......... [ ]
4. Verify that all electrical connections are tight. .............. [ ]
5. Check all duct outlets; they must be open and
unrestricted. ................................................................. [ ]
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
Electric Heating
1. R-W contacts close on the comfort control
sending 24VAC to energize the heat contactor.
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. Contacts 4 & 6 on the blower relay close pro-
viding the interlock circuit to allow the electric heat
relays to operate
Important: The comfort control must be setup to
control R-G contacts with a call for electric heat.
This closes the interlock circuit and allows the
heat relay circuit to be energized.
CHECKOUT PROCEDURE
6. Check drain lines and be sure all joints are tight. ........ [ ]
7. Be sure the return air filter is installed. ......................... [ ]
8. Be sure that the correct airflow setting is used.
(Indoor Blower Motor). ................................................. [ ]
9. Operate complete system in each mode to
verify proper performance. Verify operation of supplemen-
tary electric heater. ....................................................... [ ]
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