VIII
Does spark stay on for more than a few seconds after pilot is established?
No
Yes
Is 24VAC between terminals MV and MV/PV on ignition control?
No | Yes | ||
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Replace ignition control.
Retest.
Is inlet gas pressure at least 5.0" W.C. and not over 14" W.C.?
No | Yes |
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Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off power before proceeding could cause severe personal injury or death.
Make sure sense wire is not wrapped around any pipe or accessories.
Is sense wire securely attached to sense terminal and pilot assembly?
No | Yes | |
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Contact gas supplier to correct.
Is main valve wiring secure at terminals?
| No |
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| Yes | ||
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| Correct wiring. Retest. |
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| Replace valve. Retest. | ||
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Check for continuity of sense wire and condition of insulation.
NOT OK | OK |
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Correct and retest.
Is sensing probe ceramic cracked?
No | Yes | ||
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Replace pilot assembly.
Retest.
Is sense wire or sensing probe shorted out to metal surface?
| No | Yes | ||
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Correct and retest.
Replace pilot assembly. Retest.
Replace ignition control. Retest.
Does system have proper flame signal?
Set up microammeter to measure output current in flame sensor circuit as follows.
a. Detach sense lead from ignition control. Attach negative lead from microammeter to sense terminal on ignition control.
b. Attach positive lead to sense wire from pilot assembly.
c. Disconnect main valve lead from terminal MV on ignition control.
d. Energize the system. Spark should ignite the pilot. As soon as pilot is burning, microammeter should read at least 0.5 microamp for U.T. #
e. Is flame current signal less than the minimum specified in d above?
No | Yes | |
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Check for proper gas pressure, clean pilot assembly, tight mechanical and electrical connections. Also check for proper system grounding per following page.
Part Number | 29 |
