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4
FP
24 V HUM
C
R
G
W
Y
120 VOLT
NEUTRAL
IGN
IND
IGN N
IND N
HUM
EAC
XFMR
LINE
PARK
PARK
PARK
HEAT
COOL
FAN
IGNITOR
Y
W
G
R
THERMOSTAT
COMPRESSOR
CONTACTOR
ELECTRONIC
AIR CLEANER
HUMIDIFIER
INDUCER
CIRCULATOR
BLOWER
50A66
24 VAC
120 VAC
24 VAC CLASS II
TRANSFORMER
HOT
(LINE)
NEUTRAL
(LINE)
FLAME
SENSOR
PROBE
TH TR
Low Voltage (24 VAC)
Line Voltage (120 VAC)
LEGEND
N. C. = Normally closed switch
N. O. = Normally open switch
TYPICAL SYSTEM WIRING DIAGRAM
(E33)
(E2)
24 V
HUMIDIFIER
12-Pin Connector
HLO
PSO
HLI
PSI
GND
TH
TR
MV
LO
RO
OUT
RO
OUT
MV
COM
MV
4-Pin Connector
IND
IGN
IND
N
IGN
N
TH
TR
MV HI
MV COM
MV LO
GND
HLO
HLI
PSO
PSI
RO OUT
RO IN
2 STAGE
GAS
VALVE
HIGH LIMIT
(N. C.)
ROLLOUT
(N. C.)
AUX. HIGH
LIMIT (N. C.)
PRESSURE SWITCH (N. O.)
[12-Pin Connector]
WIRING