Trane E4AH5E24A1J30A Installation Manual page 15

Table 2. Thermostat terminal definition chart.
Unit Terminal
R
C
G
Y1
Y2
B
W1
W2
D
NOTES:
1. Be sure power supply agrees with equipment nameplate.
2. Power wiring and grounding of equipment must comply with local codes.
3. Low voltage wiring to be No. 18 AWG minimum conductor.
4. Some thermostats may use W2/AUX for heat pump.
5. The electrical heater may be not avaliable for some model (need to be checked later).
6. For single stage thermostat with Y/Y1 terminal only, place both Y1 and Y2 wire together to Y/Y1
terminal.
4.3 Grounding
WARNING
The unit must be grounded.
Failure to do so can result in electrical shock causing personal injury or death.
 Grounding may be accomplished by grounding metal conduit when installed in accordance with
electrical codes to the unit cabinet. Grounding may also be accomplished by attaching ground
wire(s) to ground lug(s) provided in the unit wiring compartment.
 Use of multiple supply circuits require grounding of each circuit to lug(s) provided in the unit.
24VAC power supply for thermostat from secondary transformer.
Compressor stage 1, low load-output control.
Compressor stage 2, high load-output control.
Reversing valve for heating pump systems.
Heating stage 1, electrical heater low load-output control.
Heating stage 2, electrical heater high load-output control.
Defrosting single wire.
Terminal defination
Common wire.
Fan motor relay.
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