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505429-JTG-F-1010
120 Johnson Controls Unitary Products
Typical Field Wiring Diagram - Twin J10 thru 20NC Evaporator Units with 4-Pipe Condenser Unit
NOTE: On non J**NC/ND Evaporator models, isolation relays must be installed to avoid overloading on 75 VA transformers on
the condensing unit.
J10 - 20NC Liquid Line Solenoid Wiring
NOTE: Refer to Evaporator unit wiring diagram for control of
liquid line solenoid valve.
R C
Y1
G W1 R C
Y1
G W1
THERMOSTAT
SINGLE STAGE COOLING
TWO STAGE HEATING
W2 W2
THERMOSTAT
SINGLE STAGE COOLING
TWO STAGE HEATING
X X
219 / Y
218 / BR
1LLS
VALVE SYS 2
BLK
BLK
C O I L