SBD TANK TYPE HEATERS
SERVICE HANDBOOK
STEP 18A
MAIN GAS VALVE CHECK
TH
TR
SBD 120 – 400 GAS VALVE
STEP 18A. MAIN GAS VALVE CHECK. Disconnect wires from gas valve TH and TR terminals. Using a multimeter, test for 68 ohms plus or minus 5 between TH and TR on the main valve coil.
IF | THEN | |
The meter reads ‘O’ or infinity | • | Replace the gas valve |
The meter reads 68* ohms plus or minus 5 | • | The main burner will ignite |
Technical Training Department | 39 |
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