The
Bradford
White
DEFENDER
Safety System®
SERVICE PROCEDURE
Gas Valve
Testing and Replacement (White Rodgers/Robertshaw)
Gas Valve Testing and Replacement (White Rodgers/Robertshaw)
The gas valve is a non repairable device. If trouble shooting has determined a problem with the gas valve, it must be replaced.
If the burner and/or pilot do not function, service checks for gas pressure, thermocouple output, magnet assembly and ECO are to be performed. If these check OK, the gas valve may be faulty.
LINE PRESSURE
The gas valve is designed for a maximum line pressure of 14.0" w.c. and a minimum line pressure of 1.0"w.c. over the water heater rated manifold pressure (check rating plate). Line pressure must be checked with burner on and burner off to assure proper readings.
MANIFOLD PRESSURE TESTING (this procedure assumes a maximum line pressure of 14.0" w.c.)
Step 1. Set gas valve to “OFF” position.
Step 2. | Remove pressure tap plug and install pressure tap. |
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Step 3. | Connect manometer to pressure tap. |
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Step 4 | Follow lighting instructions and proceed to light | Pressure Tap | |
Shown Installed | |||
| main burner and observe manometer reading. | ||
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Step 5 | Proper operating range for natural gas is 4.0 ±0.3" W.C. |
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| Proper operating range for L.P. gas is 10.0 ±0.5" W.C. |
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Step 6 | If pressure is OK, set gas valve to “OFF” |
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| remove manometer and pressure tap and replace pressure tap plug. Check for gas leaks before placing water | ||
| heater back in operation. If pressure is out of the specification noted in step 5, proceed to step 7 or 8 for proper | ||
| service procedure. |
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Step 7 | For White Rodgers control, the manifold pressure is not adjustable. If manifold pressure is outside the range | ||
| in step 5, the control must be replaced. |
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Step 8 | For Robertshaw control, the manifold pressure is adjustable, proceed to step 9 for adjustment procedure | ||
Step 9 | While burner is in operation, remove regulator access cap to expose the regulator adjusting screw. With small | ||
| screw driver, rotate adjusting screw clockwise to increase pressure and counter clockwise to decrease pressure. | ||
Step 10 Replace regulator access cap, set gas valve to “OFF”. Remove manometer and
pressure tap and replace pressure tap plug. Check for gas leaks before placing water heater back in operation.
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