TROUBLESHOOTING
NOTE: Before troubleshooting, familiarize yourself with the startup and checkout procedure.
START
. Turn gas supply
off
. Set thermostat to
SV9501
is powered
(24 VAC nominal)
|
| Check |
|
| . Line voltage power |
|
| . Low voltage |
NO |
| transformer |
| . Main limit | |
|
| |
|
| |
|
| (Auto reset) |
|
| . Rollout limit |
|
| (Manual reset) |
|
| . Auxilary limit |
|
| (Manual reset) |
|
| . Thermostat |
|
| . Wiring |
|
| . Air proving switch on |
|
| combustion air |
|
| blower system |
|
| . Vent damper (if used) |
|
| is open and end switch |
|
| made |
|
|
|
INSET
HSI
TERMINALS
Igniter warms up
and glows red
Pilot valves opens
YES
Turn gas on.
Pilot burner lights?
YES
Main valve opens?
YES
System OK
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|
|
| Unplug pilot burner cable, |
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| measure voltage at |
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| |
| NO |
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| SV9501 HSI |
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|
|
| terminals (24 VAC |
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| |
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| nominal, see inset) |
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| YES |
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| Replace igniter/flame rod as- |
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|
|
|
| sembly |
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| NO |
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| Replace SV9501 |
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| ||||
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| Measure voltage to SV9501. |
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| |
| NO |
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| Voltage must be at least 19.5 | |
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|
|
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| VAC. |
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| |
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| YES |
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| Replace igniter/flame rod as- |
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|
|
| sembly |
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| Replace igniter/flame rod as- |
|
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| sembly and retain. |
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| Restart troubleshooting se- |
| NO |
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| ||
|
| quence. | |||
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| |
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| |
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| Does main valve open? |
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| YES |
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| Discard old igniter/flame rod |
|
|
|
|
| assembly |
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|
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|
|
|
NO |
| Replace |
| SV9501 | |
|
|
|
|
| Check |
|
| transformer |
NO |
| |
| line volt | |
|
| supply |
|
| |
|
|
|
|
| Replace |
|
| SV9501 |
|
| save old |
NO |
| igniter/ |
| flame rod as- | |
|
| |
|
| |
|
| sembly for |
|
| service |
|
|
|
16 | Unitary Products Group |
