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| wiring back to the centrifugal switch of the burner |
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| blower motor. If voltage is present, check for 24VAC at |
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| pins #3 and #2 (pilot valve). If voltage is not present, |
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| replace burner control. If the pilot valve is energized, |
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| check to see that the high voltage igniter circuit is also |
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| energized. To check, turn power off, disconnect the |
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| igniter lead from the ignition control. Turn power on. If |
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| no spark is visible, replace burner control. If a spark is |
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| visible at burner control, proceed. |
| Pilot valve | Check for 24VAC supplied to pilot valve. If no voltage is |
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| present, trace wiring back to burner control. If voltage is |
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| present, check for gas pressure at the pilot line |
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| connection. If no gas pressure is present during |
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| ignition, check for any blockage in the assembly. If |
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| there are no obstructions, and there is gas supplied to |
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| the oven, replace the gas valve. |
| No pilot flame | If the ignition control is supplied with 24VAC and the |
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| pilot valve and igniter circuits are energized, visually |
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| check for a pilot flame. This may be done by looking |
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| through the inspection view port on the end of the |
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| burner. If no pilot flame is visible, check the pilot tube. |
| Pilot tube | Check for gas pressure at the pilot tube. Disconnect |
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| pilot tube at the burner And connect manometer to pilot |
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| tube. If no gas pressure is present during ignition, |
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| check for blockage of the pilot tube. If the pilot tube is |
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| clear, proceed. |
| Pilot orifice | If there is gas pressure at the pilot tube, check the pilot |
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| orifice for blockage or obstructions. Replace pilot orifice |
|
| as needed. |
| Burner igniter | Check the burner igniter head for any damage or |
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| obstructions also check for frayed or broken wire. |
|
| Check spark gap, gap should be 3/32” If there is visible |
|
| damage, replace burner igniter. |
| NOTE: Flame should be |
|
| On at this time |
|
Pilot flame, but no main flame | Electronic temperature | Check for 120VAC supplied to electronic temperature |
| control | control at terminals #13 and #12. Of there is no voltage, |
|
| trace wiring back to the burner switch. Also check for |
|
| 120VAC supplied to terminal #20 on the electronic |
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| temperature control. If there is no voltage at terminal |
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| #20, trace wiring back to terminal #13. Set temperature |
|
| control to maximum temperature and check for |
|
| 120VAC output at terminal #21 and neutral. If 120VAC |
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| is present at terminal #20 and neutral, and the unit is |
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| not heating, refer to “Temperature regulation valve” for |
|
| next check. If 120 VAC is not present, proceed. |
| Thermocouple probe | WITH POWER ON AND THERMOCOUPLE LEADS |
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| ATTACHED TO THE ELECTRONIC TEMPERATURE |
|
| CONTROL: Measure the D.C. millivolt output of these |
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| leads. Refer to chart in the “Removal, Installation and |
|
| Adjustment” section for proper readings. If these |
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| readings are not achieved, replace thermocouple. |
| Burner control. | Check for 24VAC supplied to main valve. If no voltage |
|
| is present, trace wiring back to burner control. If there is |
|
| no voltage output, replace burner control. |
| Main gas valve | Check to see that the switch on the valve is in the “ON” |
|
| position. Check for 24VAC supplied to main valve. If |
|
| there is voltage present, check to see that valve is |
|
| opening. Connect manometer to pressure tap on outlet |
|
| side of valve. If there is voltage to the valve, but no |
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| output gas pressure, replace the valve. |
8 | Impinger X2 – Analog Service Manual – Dom & Int’l |
