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