505428-YTG-V-0417
126 Johnson Controls Unitary Products
Typical Simplified Field Wiring Diagram – NL120 thru 240 Evaporator with YC120 thru 240 Condenser
NOTE: On non NL/NM Evaporator models, isolation relays
must be installed to avoid overloading on 75 VA
transformers on the condensing unit.
Typical NL120 - 240 Liquid Line Solenoid Wiring
C S1 S2 G1 G2 66 60 X
C S1 S2 G1 G2 66 60 X
W1 W2 Y1 G Y2 0CC CX R SD-24
SE CONTROL BOARD
THERMOSTAT CONNECTIONS
TB2
TB2
CONDENSER CONTROL BOX
EVAPORATOR CONTROL BOX
THERMOSTAT
TWO STAGE COOL/FAN
TWO STAGE HEAT
R C Y1 Y2 G W1 W2
UCB
VFD COMM
TB5
VFD
VLT
VFD C
1
2
3
4
TB
3-1
219 / Y
218 / BR
1LLS
VALVE SYS 2
BLK
BLK
C O I L
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