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50A62
TERMINAL
TERMINAL
W
captive screw
G
captive screw
R
captive screw
Y
captive screw
C
captive screw
MV (2 terminals)
RO1
RO2
PS
PS
GND
HL
(unused terminal)
IND
IGN
GND
GND
(unused 2 terminals)
COOL
spade terminal
HEAT
spade terminal
M1
spade terminal
M2
spade terminal
FAN
spade terminal
LINE
spade terminal
XFMR
spade terminal
CIR N
spade terminal
LINE N
spade terminal
XFMR N
spade terminal
HUM
spade terminal
EAC (optional)
spade terminal
HUM N
spade terminal
EAC N (optional)
spade terminal
TR
spade terminal
TH
spade terminal
FP
spade terminal
* maximum recommended flame probe wire length is 36 inches.
TYPICAL SYSTEM WIRING TABLE
TYPE
low voltage thermostat W terminal (or equivalent)
low voltage thermostat G terminal (or equivalent)
low voltage thermostat R terminal (or equivalent)
low voltage thermostat Y terminal (or equivalent)
2nd wire from Y terminal goes to 24 VAC HOT side of
compressor contactor coil
24 VAC COMMON side of compressor contactor coil
gas valve (both gas solenoids are connected in parallel)
rollout switch OUTPUT
rollout switch INPUT
pressure switch INPUT
9-pin
pressure switch OUTPUT
connector
& harness
MUST BE RELIABLY GROUNDED TO CHASSIS
high limit switch input
inducer HOT side
ignitor HOT side
6-pin
connector
inducer NEUTRAL side
& harness
ignitor NEUTRAL side
circulator blower COOL SPEED terminal
circulator blower HEAT SPEED terminal
unused circulator blower terminal
unused circulator blower terminal
circulator blower FAN SPEED terminal
input voltage (120 VAC) HOT side
24 VAC transformer line voltage HOT side
circulator blower NEUTRAL terminal
input voltage (120 VAC) NEUTRAL side
24 VAC transformer line voltage NEUTRAL side
humidifier HOT side
electronic air cleaner HOT side
humidifier NEUTRAL side
electronic air cleaner NEUTRAL side
24 VAC transformer (low voltage COMMON side)
24 VAC transformer (low voltage HIGH side)
flame sensor port*
SYSTEM COMPONENT
CONNECTION
5
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