
INTEGRATED
FURNACE CONTROLS
WIRING AND
CONFIGURATION
The 50A62-820 is an automatic gas interrupted ignition
control that employs a microprocessor to continually monitor,
analyze, and control the proper operation of the gas burner,
inducer, and fan.
Signals interpreted during continual surveillance of the ther-
mostat and flame sensing element initiate automatic ignition
of the burner, sensing of the flame, and system shut-off dur-
ing normal operation.
Flame Current Requirements:
Minimum current to insure flame detection.............1 μa DC
Maximum current for non-detection .....................0.1 μa DC
Maximum allowable leakage resistance ............. 100 M ohms
Flame establishing time ......................0.8 seconds maximum
Flame failure response time ...............2.0 seconds maximum
Measured with a DC microammeter in the flame probe lead
TH
TR
MV
MV
GND
PS
PS
HL
C
R
G
W
Y
IGN
IND
GND
GND
HUM
EAC
XFMR
LINE
M1
M2
FAN
HEAT
COOL
HUM N
EAC N
XFMR N
LINE N
CIR N
IGNITOR
Y
W
G
R
THERMOSTAT
GAS
VALVE
ROLLOUT
(N. C.)
HIGH LIMIT
(N. C.)
PRESSURE SWITCH
(N. O.)
FLAME
SENSOR
PROBE
COMPRESSOR
CONTACTOR
ELECTRONIC
AIR CLEANER
HUMIDIFIER
INDUCER
CIRCULATOR
BLOWER
50A62
24 VAC
120 VAC
24 VAC CLASS II
TRANSFORMER
HOT
(LINE)
NEUTRAL
(LINE)
TH TR
Low Voltage (24 VAC)
Line Voltage (120 VAC)
LEGEND
N. C. = Normally closed switch
N. O. = Normally open switch
RO1
RO2
TYPICAL SYSTEM WIRING DIAGRAM
FP
50A62-820
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