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WIRING
HOT
(LINE)
HUMIDIFIER
(OPTIONAL)
ELECTRONIC
AIR CLEANER
(OPTIONAL)
THERMOSTAT
CONDENSING
UNITS
FLAME
SENSOR
PROBE
4
50M58-289 TYPICAL WIRING DIAGRAM
120 VAC
24 VAC
TH
50M58-289
T1
T2
T3
T4
LINE
XFMR
EAC
HUM
IGN
IND HI
INDUCER
IND LO
IND N
IGN N
CIRC N
LINE N
XFMR N
HUM N
EAC N
R
R
G
G
W2
W2
W1
W1
Y2
Y
TWIN
C
HLO
HLI
FP
PS1
MVL
MVH
GND
GND
PS2
MV COM
TR
TH
FP2 (E33)
24 VAC CLASS II
TRANSFORMER
TR
CIRCU-
LATOR
BLOWER
IGNITOR
50M58-289
Application
1ST STAGE PRESSURE
HIGH LIMIT
ROLLOUT
SWITCH (N. O.)
(N. C.)
SWITCH (N. C.)
AUX. HIGH
LIMIT (N. C.)
2ND STAGE PRESSURE
SWITCH (N. O.)
NEUTRAL
(LINE)
in other
furnace
Twin
Only
GAS
VALVE
LEGEND
Low Voltage (24 VAC)
Line Voltage (120 VAC)
N. C. = Normally closed switch
N. O. = Normally open switch
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