Section 7. Heater Operation
7.1 GAM5B Heater Operation
Electric Heating
1. R-W contacts close on the comfort control sending
24VAC to the EHC to energize the heat relay.
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 providing
the interlock circuit to allow the electric heat relays
to operate
The comfort control must be setup to control R-G con-
tacts with a call for electric heat. This closes the interlock
circuit and allows the heat relay circuit to be energized.
Electric Heating
Note:
The TAM9, TAMX / TAMG can use a
communicating or 24 volt comfort control to send a
heater request to the AFC/AHC.
1. When a request for electric heat is received,
the AFC/AHC will energize the on board 24 volt
relays per the amount of heat requested from the
thermostat and the size of the heater installed.
2. The AFC/AHC sends a command to the serial
communicating blower motor to run proper airflow
and close the blower interlock relay on the EHC.
7.3 TAM9, TAMX / TAMGB Heater Operation
7.2 TAM4 Heater Operation
Electric Heating
1. R-W contacts close on the comfort control sending
24VAC to the W terminal on the TDR. 24VAC is also
sent to EHC to energize the heat relay.
2. R-G contacts close on the comfort control sending
24VAC to the G terminal on the TDR. (The combination
of 24VAC on terminals W and G on the TDR will close
the high speed contacts of the TDR)
3. WJ contacts on the TDR close providing an interlock
circuit to allow the electric heat relays to operate.
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.
About Trane and American Standard Heating and Air Conditioning
Trane and American Standard create comfortable, energy efficient indoor environments for residential applications.
For more information, please visit www.trane.com or www.americanstandardair.com
The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are
committed to using environmentally conscious print practices.
© 2020
18-GJ22D1-1E-EN 30 Oct 2020
Supersedes 18-GJ22D1-1D-EN (April 2020)
