Weil-McLain 550-110-260/02002 manual continued, Boiler Manual, Does inducer motor operate?

Boiler Manual

continued

CHART 3 — PRESS SWITCH & POWER lights flashing

— Usually indicates pressure switch stuck closed or failed to make within 5 minutes —

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 inducer motor operate?

No

• Wait 45 seconds.

Does inducer motor operate?

Yes

No Yes

•Remove INDUCER plug (Figure 25, Item 6, page 44) from plug receptacle of control module.

•Place voltmeter leads across the 120 VAC N and

120 VAC H pins of the INDUCER receptacle (left column center and right column bottom pins).

Does the voltmeter indicate 120 VAC?

No Yes

• Wait 5 minutes.

Is PRESS SWITCH light flashing?

No Yes

• Try reseating plug in module receptacle and restart.

• If inducer still does not work, replace inducer assembly.

• Retest.

•Remove one of the wires connected to the pressure switch.

•Check continuity across the switch terminals.

Does the ohmmeter indicate the switch is closed?

No Yes

•Boiler should be in normal operating sequence.

•Observe operation until thermostat is satisfied and inducer has completed its post-purge cycle.

Are vent or combustion air

passages blocked?

No Yes

•	Replace control	• Check air pressure switch
			per manual Section 11.
	module.
		•	Replace if necessary.
•	Retest.
		•	Retest.

•Clear passages and recycle boiler.

•Recheck boiler operation.

Part number 550-110-260/0200 47