Technical Guide

505428-YTG-R-1114
Johnson Controls Unitary Products 125
Typical Field Wiring Diagram - ND120 thru 240 Evaporator Unit with YD120 thru 240 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.
THERMOSTAT
TWO STAGE COOLING
TWO STAGE HEATING
G C
Y1
RW1 W2 X
Y2
NOTE: Liquid line solenoid is not included or required
on any 4 pipe units.