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WIRING AND
CONFIGURATION
HOT
(LINE)
HUMIDIFIER
ELECTRONIC
AIR CLEANER
Low Voltage (24 VAC)
Line Voltage (120 VAC)
N. C. = Normally closed switch
N. O. = Normally open switch
50A55-843
TYPICAL SYSTEM WIRING DIAGRAM
120 VAC
TH
INDUCER
XFMR N
50A55-843
in other
furnace(s)
—
TWINNING
APPLICATIONS
ONLY
TWIN*
FLAME
SENSOR
PROBE
LEGEND
www.white-rodgers.com
24 VAC CLASS II
TRANSFORMER
24 VAC
TR
50A55
COOL
HEAT
PARK
PARK
LINE
XFMR
EAC
HUM
IND
IGN
IGNITOR
IND N
IGN N
CIR N
LINE N
HUM N
EAC N
Y
Y
COMPRESSOR
W
W
G
G
R
R
THERMOSTAT
C
TWIN*
PRESSURE SWITCH (N. O.)
PS
HLI
HLO
HIGH LIMIT
AUX. HIGH
FP
(N. C.)
LIMIT (N. C.)
RO1
ROLLOUT
GND
(N. C.)
RO2
MV
MV
TR
TH
Flame Current Requirements:
Maximum current for non-detection .....................0.1 µa DC➀
Flame establishing time ......................0.8 seconds maximum
Flame failure response time ...............2.0 seconds maximum
➀
50A55-843
NEUTRAL
(LINE)
CIRCULATOR
BLOWER
CONTACTOR
GAS
VALVE
.............1 µa DC➀
............. 100 M ohms
183
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Summary of Contents for White Rogers 50A55-843
- Page 1 WIRING AND CONFIGURATION 50A55-843 50A55-843 TYPICAL SYSTEM WIRING DIAGRAM NEUTRAL (LINE) (LINE) 120 VAC 24 VAC CLASS II TRANSFORMER 24 VAC 50A55 COOL HEAT CIRCULATOR PARK BLOWER PARK LINE XFMR INDUCER IGNITOR IND N HUMIDIFIER IGN N CIR N LINE N...
- Page 2 OPTION SWITCHES If the thermostat fan switch is moved to the ON position, the The option switches on the 50A55-843 control are used to circulator fan (cool speed) and optional electronic air cleaner determine the length of the cool delay-to-fan-off, heat delay- are energized.
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