Typical System Wiring Diagram - White Rodgers 50M56U-751 Installation Instructions Manual

WIRING DIAGRAM
HOT
(LINE)
Optional
ELECTRONIC
AIR CLEANER
120 V
GAS
VALVE
Low Voltage (24 VAC)
Line Voltage (120 VAC)
N. C. = Normally closed switch
N. O. = Normally open switch
4

TYPICAL SYSTEM WIRING DIAGRAM

TH
Optional
HUMIDIFIER
120 V
FLAME
SENSOR
PROBE
LEGEND [12-Pin Connector]
4-Pin Connector
*Use Line Neutral terminal when replacing new style control.
120 VAC
24 VAC CLASS II
TRANSFORMER
24 VAC TR
50M56
COOL
LO HEAT
HI HEAT
LINE - H
XFMR - H
EAC - H
HUM - H
PARK
PARK
INDUCER
IND-N*
IND
IGN
IGN-N*
IGNITOR
[4-Pin Connector]
CIR N
LINE N
XFMR N
HUM N
EAC N
Y Y
W W
G G
R R
THERMOSTAT
C
FS
HIGH LIMIT
(N. C.)
HLO
MV LO
TH
PSO
Not Used
TR
HLI
GND
PRESSURE SWITCH
MV COM
PSI
Not Used
Twinning: The control board in this kit CANNOT
Not Used
be twinned with any of the Carrier circuit boards.
HLO PSO
MV
5
LO
IND IGN
IND IGN
TR
TH
N N
12-Pin Connector
NEUTRAL
CIRCULATOR
BLOWER
COMPRESSOR
CONTACTOR
OPTIONAL
24 V HUM
AUX. HIGH
LIMIT (N. C.)
(N. O.)
HLI PSI
GND
11
9 12
(LINE)