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505429-JTG-F-1010
Johnson Controls Unitary Products 121
Typical Field Wiring Diagram - Single 4-Pipe Evaporator Unit with Twin Condenser Units
NOTE: On non J**NC/ND Evaporator models, isolation
relays must be installed to avoid overloading on 75
VA transformers on the condensing unit.
RC
Y2
G W1
THERMOSTAT
TWO STAGE COOLING
SINGLE STAGE HEATING
RC
Y2
G W1
THERMOSTAT
TWO STAGE COOLING
SINGLE STAGE HEATING
Y1
Y1
X
X