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BRADFORD WHITE

 

 

 

 

5.2.10 Testing the Safety Shutoff (for standing pilot)

After lighting the heater, test the ignition system safety shutoff.

1.With the main burners firing, turn the gas valve control knob off.

2.Turn power to the heater off.

3.Set the temperature control to its lowest setting.

4.Wait 5 minutes.

Caution

Flame Hazard. Failure to wait 5 minutes, or not turning the gas valve knob to OFF, may cause the flow of unlighted main burner gas.

5.Turn the gas valve control knob to the PILOT position.

6.Without pressing the control knob down, it should be impossible to light the pilot.

7.Relight the pilot following the lighting instructions found on the inside of the heater.

8.Reset the temperature control.

9.Light the heater following the instructions found on the inside of the heater.

5.2.11 Testing the Safety Shutoff

(for automatic pilot)

1.Find the red silicone rubber insulated wire that runs from the pilot to the ignition stud on the ignition control module.

2.With the main burners firing, use an insulated pair of pliers to disconnect the sensor wire from the control module. Do not pull on the wire. The main burner flame should immediately go out.

3.Turn the gas valve control knob to the off position.

4.Reattach the red silicone wire to the control module.

5.2.12 Testing the Igniter Electrode

To test the igniter electrode:

1.Make sure all of the wire connections on the ignition control and the gas valve are tight.

2.Make sure the wiring agrees with the wiring diagrams found on the inside of the heater.

3.Check for sparking at the igniter electrode.

4.If there is sparking at the igniter electrode, but there is no pilot ignition after 10-20 seconds, clip a lead from the voltmeter between the yellow wire terminal on the transformer and the orange wire terminal on the gas valve.

5.If the voltmeter does not show voltage, replace the ignition control.

6.If the voltmeter reads 24 to 28VAC, but there is no pilot ignition, check for

a:air in gas lines.

b:restrictions in gas line, valve or pilot tubing.

c:clogged pilot orifice.

If these are correct then replace gas valve (see Section 4.2).

WARNING

Never attempt to repair the gas valve. Such attempts will void the warranty, and could lead to dangerous results.

5.2.13 Testing the Pilot Thermocouple (for standing pilot)

If there is voltage to the gas valve, the pilot is lit, the thermocouple is properly positioned, the temperature control is set high enough to call for heat; then the gas valve or the pilot thermocouple may be the problem. To test the pilot thermocouple:

1.Remove the pilot thermocouple fitting from the gas valve.

2.Clip one lead of a millivolt meter on the center post of the tube and the other lead on the copper pilot thermocouple shield. Turn the gas valve control knob to the “Pilot” position, depress it, and light the pilot. You will have to keep the gas valve control knob depressed throughout this test.

3.If the millivolt meter reads about 30 millivolts, go to step 5.

4.If the millivolt meter does not show voltage or voltage is very low, it could indicate a dirty or clogged pilot. Clean and recheck the pilot thermocouple. If voltage still does not show or is very low, replace the pilot thermocouple.

5.To test the pilot thermocouple under load, screw the pilot thermocouple into the end of a millivolt reading adapter (see Figure 42).

6.Clip one lead of a millivolt meter to either side of the millivolt adapter and clip the other lead to ground.

7.Light the pilot following the instructions found on the inside of the heater.

8.Set the temperature control high enough to call for heat.

9.With the heater firing, take a millivolt reading.

10.If the millivolt meter does not read about 10 millivolts, replace the pilot thermocouple.

5.2.14 Testing for Pilot Burner (for spark ignition)

When the pilot burner lights, the sparking should stop and the main burners should fire. If the sparking continues and the main burners do not fire:

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Bradford-White Corp B4 Testing the Safety Shutoff for standing pilot, Testing the Safety Shutoff For automatic pilot
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B4 specifications

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