TYPICAL SYSTEM WIRING DIAGRAM
HOT
(LINE)
TH
INDUCER
HUMIDIFIER
ELECTRONIC
AIR CLEANER
in other
furnace(s)
—
TWINNING
APPLICATIONS
ONLY
TWIN*
FLAME
SENSOR
PROBE
LEGEND
Low Voltage (24 VAC)
Line Voltage (120 VAC)
N. C. = Normally closed switch
N. O. = Normally open switch
120 VAC
24 VAC
50A55
COOL
HEAT
PARK
PARK
LINE
XFMR
EAC
HUM
IND
IGN
IND N
IGN N
CIR N
LINE N
XFMR N
HUM N EAC N
Y
W
G
R
C
TWIN*
PS
HLI
HLO
FP
RO1
GND
RO2
MV
MV
TR
TH
NEUTRAL
(LINE)
24 VAC CLASS II TRANSFORMER
TR
CIRCULATOR
BLOWER
IGNITOR
Y
WCOMPRESSOR
CONTACTOR
G
R
THERMOSTAT
PRESSURE SWITCH (N. O.)
HIGH LIMIT | AUX. HIGH | |
(N. C.) | LIMIT (N. C.) | |
ROLLOUT |
|
|
|
| |
(N. C.) |
| GAS |
|
| VALVE |
|
|
|
4
