CONQUEST 80 - Standing Pilot Troubleshooting Guide

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FIGURE53

STANDING PILOT CONTROL TROUBLESHOOTING GUIDE

c:,

z

-

z

a:

<

3:

I

I

I

I

I

I

I

I

I

I

START

LIGHT PILOT BURNER

(PILOT BURNER STAYS LIT)

YES

,.

SET THERMOSTAT

TO CALL FOR HEAT

YES

,

INDUCED DRAFT MOTOR STARTS

YES

'

MAINBURNER LIGHTS

YES

,~

INDOOR BLOWER MOTOR

STARTS AFTER 20 SECONDS

YES

w

SYSTEM RUNS UNTIL

CALL FOR HEAT ENDS

YES

'

TURN THERMOSTAT TO OFF-

VALVE SHUTS FLAME OFF

YES

1W

INDUCED DRAFT MOTOR STOPS

YES

INDOOR BLOWER MOTOR STOPS

AFTER 90/120/150/180 SECONDS

YES

TROUBLESHOOTINGENDS

I NO

I

I

NO

I NO

I

INO

I

I NO

I

I NO

I

I NO

l

I

-

-

-

• CHECK INLET GAS PRESSURE

-

• CHECK PILOT FLAME AROUND THERMOCOUPLE

• CHECK THERMOCOUPLE FITTING AT GAS VALVE

yYES

REPLACE THERMOCOUPLE

NO

- REPUICE GAS VALVE

-

• CHECK LINE VOLTAGE TO CONTROL BOARD

• CHECK LOW VOLTAGE TRANSFORMER

• CHECK LOW VOLTAGE TRANSFORMER FUSE

• CHECK LIMITS (CLOSED)

• CHECK WIRING

• CHECK

FANFOR 115VAC TO !OMMOTOR

NO

- REPLACE

-

CONTROL

f YES

BOARD

REPLACE

IDMMOTOR

I

REPLACE

• CHECK FOR BLOCKED VENT

NO

PRESSURE

• CHECK NEGATIVE PRESSURE CONTROL

CONTROL

!CLOSED)

• CHECK24 VOLTS TOGAS VALVE

NO

REPLACE

-

• CHECK FOR GAS FLOW TO AND FROM VALVE

CONTROL

I

BOAADIF

f NO

WIRING IS OK

REPLACEVALVE

I

• CHECK FOR 115VAC ACROSS BLOWER

INO

MOTOR TERMINALS ON CONTROL BOARD

REPLACE

-

-

• CHECK CAPACITOR

CONTROL

I

BOARD IF

yNO

WIRINGTO

MOTOR IS OK

REPLACE BLOWER MOTOR

I

.

• CHECK FOR PROPER THERMOSTAT OPERATION

-

• REMOVEVALVELEADATGASVALVE

-

IF VALVE CLOSES. RECHECK THERMOSTAT AND WIRING.

-

-

-

IF VALVE DOES NOT CLOSE, REPLACE VALVE,

REPLACE CONTROL BOARD

I

• CHECK FOR OPEN LIMIT: I

REPLACECONTROL BOARD

REPEAT PROCEDURE UNTIL

TROUBLE-FREE OPERATION IS OBTAINED.

59

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