• Installation •
CHART 4 — PRES SWITCH & POWER lights flashing
Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow instructions could result in severe personal injury, death or substantial property damage.
•Reset boiler control by turning off power at service switch or turning down thermostat for at least 45 seconds.
•Thermostat should call for heat and appropriate zone valves open.
Does blower motor operate?
No
Yes
Wait 45 seconds.
Does blower motor operate?
No | Yes | |
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Is blower wheel turning at speed of blower motor?
No | Yes |
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•Remove BLOWER plug (Figure 34, Item 3) from plug receptacle of control module.
•Place voltmeter leads across the 120 VAC N and 120 VAC H pins of the BLOWER receptacle.
Does the voltmeter indicate 120 VAC?
No | Yes | |
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▲TURN OFF POWER▲ at service switch.
Does blower wheel turn freely by hand?
No | Yes |
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▲TURN OFF POWER▲ at service switch.
•Properly position blower wheel on blower motor shaft and tighten set screw. (Or replace blower housing assembly.)
•Retest.
Wait 5 minutes.
Is purge light flashing?
No | Yes | |
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Properly position |
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blower wheel on |
| Replace blower | ||
blower motor shaft |
| motor. (Also check | ||
and tighten set screw. |
| blower housing | ||
(Or replace blower |
| assembly. Replace if | ||
housing assembly.) |
| necessary.) | ||
Retest. |
| Retest. | ||
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•Remove one of the red wires connected to the pressure switch.
•Check continuity across the switch terminals.
Does the ohmmeter indicate the switch is closed?
No | Yes | ||
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Boiler should be in normal operating sequence.
Observe operation until thermostat is satisfied and blower has completed its post- purge cycle.
Check condensate trap. Is there condensate present?
| No |
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Are vent or combustion air |
| Drain condensate. | |||||
| Retest. | ||||||
passages blocked? |
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No |
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Replace control module. Retest.
Check air pressure switch per manual Section XI. Replace if necessary. Retest.
Clear passages and recycle boiler. Recheck boiler operation.
Part number | 77 |
