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Operation (contd.)
TROUBLESHOOTING (CONTROLS) - Continued
TRANSFORMER
INCOMING
LINE VOLTAGE
THERM
AUX
PRESS
HEAT
FRONT PANEL LEDS
TRANSFORMER
INCOMING
LINE VOLTAGE
THERM
AUX
PRESS
HEAT
FRONT PANEL LEDS
P/N 472128
LED OFF
LED LIT
CIRCUIT
REMOTE
BREAKER
THERMOSTAT
RELAY
RMT
PWR
TSTAT
POWER
SERVICE
HEATER FIRING - NORMAL OPERATION
CIRCUIT
REMOTE
BREAKER
THERMOSTAT
RELAY
RMT
PWR
TSTAT
POWER
SERVICE
THERMOSTAT CALLING FOR HEAT - BLOWN THERMAL FUSE BLOCKS FIRING
NOTE: SERVICE LED LIT FLAGS PROBLEM, TFUSE LED OFF SHOWS PROBLEM
IS IN THERMAL FUSE CIRCUIT
SYMBOL TABLE
SWITCH OR DEVICE
SWITCH OR DEVICE
OPEN CIRCUIT
CLOSED CIRCUIT
(BLOCK CURRENT)
(PASS CURRENT)
HI TEMP
PRESS
TFUSE
LIMIT SWITCHES
PRESS
HI TEMP
TFUSE
SRVE
CLOSE IF
NO MV
THERMOSTAT CIRCUIT BOARD
HI TEMP
PRESS
TFUSE
LIMIT SWITCHES
PRESS
HI TEMP
TFUSE
SRVE
CLOSE IF
NO MV
THERMOSTAT CIRCUIT BOARD
A-6
IGNITION MODULE
IND
GND
VAL
GAS VALVE
MV
MV
HEAT
MV
IGNITION MODULE
IND
GND
VAL
GAS VALVE
MV
MV
MV
HEAT
Rev. C 1-22-04
28

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