White Rodgers 50M56-743 Installation Instructions Manual page 5

50M56
TERMINAL
W
G
R
Y
C
HLO (Pin 1)
MV LO (Pin 2)
TH (Pin 3)
PSO (Pin 4)
RO OUT (Pin 5)
TR (Pin 6)
HLI (Pin 7)
GND (Pin 8)
MV COM (Pin 9)
PSI (Pin 10)
RO IN (Pin 11)
MV HI (Pin 12)
IND (Pin 1)
IGN (Pin 2)
IND-N (Pin 3)
IGN-N (Pin 4)
COOL
LO HEAT
HI HEAT
PARK (2 terminals)
LINE
XFMR
EAC (optional)
CIR N
LINE N
XFMR N
EAC N (optional)
FS
Maximum recommended flame probe wire length is 36 inches.
†
TYPICAL SYSTEM WIRING TABLE
TERMINAL
TYPE
low voltage thermostat W terminal (or equivalent)
low voltage thermostat G terminal (or equivalent)
Terminal
low voltage thermostat R terminal (or equivalent)
block with
low voltage thermostat Y terminal (or equivalent)
captive
(2nd wire from Y terminal goes to 24 VAC HOT side of
screws
24 VAC COMMON side of compressor contactor coil
high limit OUTPUT
gas valve first stage
24 VAC transformer (low voltage HIGH side)
pressure switch OUTPUT
rollout switch OUTPUT
HLO PSO HLI PSI
24 VAC transformer (low voltage COMMON side)
high limit INPUT
MV RO
RO
GND
LO OUT
IN
MUST BE RELIABLY GROUNDED TO CHASSIS
MV
MV
TR
TH
COM HI
gas valve COMMON
pressure switch INPUT
rollout switch INPUT
gas valve second stage
inducer HOT side
ignitor HOT side
IGN
IND
IND IGN
N N
inducer NEUTRAL side
ignitor NEUTRAL side
spade terminal circulator blower COOL SPEED terminal
circulator blower LO HEAT SPEED terminal
spade terminal
spade terminal circulator blower HI HEAT SPEED terminal
spade terminal unused terminals
input voltage (120 VAC) HOT side
spade terminal
spade terminal 24 VAC transformer line voltage HOT side
electronic air cleaner HOT side
spade terminal
spade terminal circulator blower NEUTRAL terminal
spade terminal input voltage (120 VAC) NEUTRAL side
24 VAC transformer line voltage NEUTRAL side
spade terminal
spade terminal electronic air cleaner NEUTRAL side
spade terminal flame sensor probe
SYSTEM COMPONENT
CONNECTION
compressor contactor coil)
†
WIRING
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