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Subject to change without notice. Printed in U.S.A. 505429-JTG-F-1010
Copyright © 2010 by Johnson Controls, Inc. All rights reserved. Supersedes: 505429-JTG-E-0810
Johnson Controls Unitary Products
5005 York Drive
Norman, OK 73069
Typical Field Wiring Diagram - Twin J07NC 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.
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