TROUBLESHOOTING PROCEDURE - ELECTRONIC IGNITION SYSTEM
START | CHECK |
• Turn Off Gas Supply. |
| • Check for proper volt- |
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• Ensure Valve Switch Is In ON Position. |
| age at control harness |
| • | Line voltage power |
• Disconnect Control Harness. |
| (see insert A). Voltage | NO | • | Low voltage transformer |
• Set Thermostat To Call For Heat. | 2 | should be 24V between |
| • | Limit controller |
| thermostat or pressure |
| • Thermostat | ||
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| • | Wiring | |
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| switch and 24V common |
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| and 24V hot. |
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| YES |
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Insert A | • Plug control harness into | |
| valve. Wait for internal check | |
End View of Control Harness Connector | delay. | |
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24 Volt Hot | 24 Volt |
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| • With pilot burner cable con- |
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Common |
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| 1 |
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| NO |
| nected, measure voltage at | NO |
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| • Igniter warms up and glows |
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| • Replace valve. | |||||
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| valve HSI element output. 24V |
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| red. |
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| 2 |
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| nominal. (See insert B) |
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| YES |
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24 Volt |
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| 1 | YES |
| • Replace igniter/flame rod |
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| assembly. |
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Switched |
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Check For Damaged or Missing |
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Terminals in Connector |
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| NO | • Check that pilot gas is flowing. Wait | NO |
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| • Turn on gas supply. |
| to ensure pilot gas tubing is purged. | • Replace valve. | |||||
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| • Pilot burner lights. |
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| Recycle call for heat if necessary. |
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Insert B |
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| YES |
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| Igniter Terminals |
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| • Measure voltage between 24V hot and |
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| 24V common leads to valve control. |
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| Must measure at least 19.5 VAC with | NO | • Check transformer and | |
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| igniter powered (see insert A). To | line volt supply. | ||
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| identify proper lead, this check must |
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| be done with the valve control con- |
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| nected and igniter powered. |
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| YES |
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| • | Replace Pilot Assembly. |
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| • | Check that pilot flame makes good |
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| contact with pilot burner flame rod. |
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| • | Main valve opens and main | NO | • Check for good electrical connection |
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| burner lights. |
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| through the pilot tubing. |
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| • If both of the above are good, replace |
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| igniter/flame rod assembly. |
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| YES |
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| YES |
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| • System Is okay. |
| • Cycle thermostat off and back on. |
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1 | Igniter | will cycle off | and | 2 | When measuring voltage |
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back on once during the 90 | at connections, use care |
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| second | ignition trial. | All |
| to ensure terminals are |
| • | Main burner lights. |
| • Replace valve. | |
| voltage measurements must |
| not damaged. |
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| be taken while the igniter is |
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| powered. |
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| 13 | |
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. | ||
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13
