Operation (contd.) | 28 |
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TROUBLESHOOTING (CONTROLS) - Continued
INCOMING TRANSFORMER
LINE VOLTAGE
THERM | POWER |
AUX | SERVICE |
PRESS |
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HEAT | FRONT PANEL LEDS |
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INCOMING TRANSFORMER
LINE VOLTAGE
THERM | POWER |
AUX | SERVICE |
PRESS |
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HEAT |
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| FRONT PANEL LEDS |
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| SYMBOL TABLE |
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| SWITCH OR DEVICE | SWITCH OR DEVICE | |
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| OPEN CIRCUIT | ||
| LED OFF | CLOSED CIRCUIT | ||
LED LIT | (BLOCK CURRENT) | |||
(PASS CURRENT) | ||||
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| IGNITION MODULE | |
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| IND | GND | VAL |
CIRCUIT |
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| HI TEMP |
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| GAS VALVE |
REMOTE | PRESS | TFUSE |
| MV | ||
BREAKER | LIMIT SWITCHES |
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| MV |
| THERMOSTAT |
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| RELAY |
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PWR | RMT | PRESS | HI TEMP | TFUSE | MV | HEAT |
TSTAT |
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SRVE 
CLOSE IF
NO MV
THERMOSTAT CIRCUIT BOARD
HEATER FIRING - NORMAL OPERATION
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| IGNITION MODULE | |
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| IND | GND | VAL |
CIRCUIT |
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| HI TEMP |
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| GAS VALVE |
REMOTE | PRESS | TFUSE |
| MV | ||
BREAKER | LIMIT SWITCHES |
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| MV |
| THERMOSTAT |
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| RELAY |
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PWR | RMT | PRESS | HI TEMP | TFUSE | MV | HEAT |
TSTAT | ||||||
SRVE
CLOSE IF
NO MV
THERMOSTAT CIRCUIT BOARD
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
P/N 472128 | Rev. C |
