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18-GJ89D1-1E-EN

Table 18. 24 Volt Low Voltage Wiring

COMFORT CONTROL

B/C

OUTDOOR UNIT

INDOOR UNIT

Y1in

Y2in

Y1out

Y2out

2 Stage Cooling or Heat Pump with TAMX Variable Speed Air Handler

Note 1

Note 3

Note 5

Note 2

Note 4

For AC only units, move dip switch 1 to

the ON position

Note 6

Notes:

1. Separate the BK and R wires when using the BK functionality from the thermostat or a Humidistat.

2. Yin and Yout connections must be made as shown for freeze protection and internally mounted condensate overflow circuits to

function properly.

3. 3rd party condensate switch should break the Y1-in circuit between the thermostat and AHC.

4. Y2-out connections at outdoor unit only required for two stage units and should be capped off when not in use.

5. Only needed for heat pump operation.

6. X2 is necessary if not using select Trane or American Standard thermostats.

EElleeccttrriiccaall —— LLooww VVoollttaaggee

Trane Technologies 4TWX8024 User Manual

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