Technical Guide

505428-YTG-M-0512
Johnson Controls Unitary Products 121
Typical Field Wiring Diagram - NC090 Evaporator Unit with YC090 Condenser Unit
NOTE: On non NC/ND Evaporator models, isolation relays
must be installed to avoid overloading on 75 VA
transformers on the condensing unit.
G C
Y1
RW1 W2
THERMOSTAT
SINGLE STAGE COOLING
TWO STAGE HEATING
X
NOTE: Liquid line solenoid is not included or required
on 7.5 Ton Single Stage Units.