S U F S E R V I C E H A N D B O O K

T R O U B L E S H O O T I N G

GAS VALVE TEST

STEP 12

24 VAC TO GAS VALVE

SUF 240 ONLY

STEP 12: CHECK FOR 24 VAC TO GAS VALVE DURING TRIAL FOR IGNITION. Condition:

All wires are reconnected.

On/Off switch is on.

Call for heat is activated.

Perform test at end of ignitor warm up period.

Touch meter probes to wiring terminals on gas valve with wires from control board still connected during the ignitor warm up period.

IF…

AND

THEN

 

 

 

 

 

 

 

 

24

VAC is not present to gas valve

 

replace control board if Step 9A and 9B have

 

 

 

been performed and results were successful.

 

 

 

 

24

VAC is present

gas does not flow to burner

check for/restore supply gas;

 

 

 

check for/clear any restriction in the gas train;

 

 

 

replace the gas valve if the valve will not open

 

 

 

with 24 VAC applied.

 

 

 

 

24

VAC is present

gas does flow to burner

continue to Step 13.

 

 

 

 

Technical Training Department

30

State Water Heaters

STC-077

Ashland City, Tennessee © 2004

Page 31
Image 31
State Industries STC-077 dimensions GAS Valve Test, SUF 240 only, VAC to GAS Valve

STC-077 specifications

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