Rev. B 4-16-02
7
P/N 472091
HEAT (HEAT)
The heat light is on any time the thermostat has signaled a
call for heat which initializes the ignition safety firing circuit -
- the light comes on to indicate successful firing of the main
burners.
SERVICE (SERVICE)
The service light is off during normal operation of heater.
The light only comes on if a problem with a control has
occurred or when the heater is first firing. The problem must
be investigated by the serviceman prior to attempts to fire
the heater again.
The diagrams that follow give examples of troubleshooting a malfunctioning heater using the assistance of the indicator lights.
E.
TROUBLESHOOTING
Example of troubleshooting with the assistance of the indicator lights.
INDICATOR LIGHT DESCRIPTION,
(cont’d.)
PWR
TSTAT
RMT
PRESS
SRVE
HI TEMP
TFUSE
GAS VALVE
MV
MV
IGNITION MODULE
IND
GND
VAL
MV
HEAT
CLOSE IF
NO MV
THERMOSTAT
RELAY
REMOTE
PRESS
TFUSE
HI TEMP
LIMIT SWITCHES
BREAKER
CIRCUIT
TRANSFORMER
INCOMING
LINE VOLTAGE
THERMOSTAT CIRCUIT BOARD
LIMIT SWITCHES
HI TEMP
NO MV
CLOSE IF
THERMOSTAT CIRCUIT BOARD
TRANSFORMER
LINE VOLTAGE
INCOMING
PWR
CIRCUIT
BREAKER
TSTAT
RMT
RELAY
THERMOSTAT
REMOTE
PRESS
SRVE
PRESS
HI TEMP
MV
TFUSE
TFUSE
HEAT
IGNITION MODULE
IND
GND
VAL
GAS VALVE
MV
MV
WATER AT SELECTED TEMPERATURE.... NORMAL OPERATION
THERMOSTAT CALLING FOR HEAT - PUMP OFF(NO PRESSURE) BLOCKS FIRING
NORMAL OPERATION
SYMBOL TABLE
LED LIT
LED OFF
SWITCH OR DEVICE
OPEN CIRCUIT
(BLOCK CURRENT)
SWITCH OR DEVICE
CLOSED CIRCUIT
(PASS CURRENT)
THERM
AUX
PRESS
HEAT
POWER
SERVICE
FRONT PANEL LEDS
FRONT PANEL LEDS
HEAT
PRESS
AUX
THERM
SERVICE
POWER
OR POOL/OFF/SPA THERMOSTAT SELECT SWITCH OFF.... NORMAL OPERATION
