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BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products Service Handbook
Irving, Texas ©2000 Training Department
40
STEP 18A MAIN GAS VALVE CHECK
BTR 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
themainvalvecoil.
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
TH
TR