Trane OXBOX J4PH4 Series - Thermostat Signals and Wiring

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Table 8-1: Thermostat Signals
Signal State Board Function
G
G & W1
G & W & W2
G & Y
G & B & Y
G & B & Y & W1
G & B & Y & W1 & W2
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Blower instant ON
Blower 90 sec. delay OFF
Blower instant ON
Heater bank 1 elec.onstant ON
Heater bank 1 elec.instant OFF
Blower 90 sec. delay OFF
Blower instant ON
Heater 1 instant ON
Heater 2 instant ON
Blower 90 sec. delay OFF
Heater 1 instant OFF
Heater 2 instant OFF
Blower instant ON
Compressor and outdoor fan instant ON
Compressor and outdoor fan instant OFF
Blower fan delay 90 sec. OFF
4-way valve instant ON
Blower instant ON
Compressor and outdoor fan instant ON
Compressor and outdoor fan instant OFF
Blower fan delay 90 sec. OFF
4-way valve instant OFF
4-way valve instant ON
Blower instant ON
Compressor and outdoor fan instant ON
Heater 1 instant ON
4-way valve instant OFF
Blower fan delay 90 sec. OFF
Compressor and outdoor fan instant OFF
Heater 1 instant OFF
4-way valve instant ON
Blower instant ON
Compressor and outdoor fan instant ON
Heater 1 instant ON
Heater 2 instant ON
4-way valve instant OFF
Blower fan delay 90 sec. OFF
Compressor and outdoor fan instant OFF
Heater 1 instant OFF
Heater 2 instant OFF
8.4 THERMOSTAT SIGNALS
Thermostat Wire Color
Red
Function
Power wire
Black Power wire
White Heater signal 1
Green Blower fan signal
Yellow Compressor signal
Blue Reversing valve signal
White/Black Heater signal 2
Table 8-2: Thermostat Wire Color
Shut-down conditions of defrost mode:
No matter what defrost mode is selected, the defrost cycle will end in any of the
following conditions:
1. The defrost cycle has been running for 10 minutes;
2. T3 is ≥ 77 °F and T4 ≥ 28.4 °F;
3. The compressor stops operating;
4. T3 is ≥ 77 °F for more than 60s when T4 < 28.4 °F.