Lochinvar WH 55-399 Maintenance Maintenance and annual startup, Service technician, General

Installation & Operation Manual

12 Maintenance Maintenance and annual startup

Table 12A Service and Maintenance Schedules

Service technician

(see the following pages for instructions)

	General:
	• Address reported problems
	• Inspect interior; clean and vacuum if
	necessary;
	• Clean condensate trap and fill with fresh
	water
	• Check	for	leaks	(water, gas,		flue,
	condensate)
	• Verify flue and air lines in good condition
	and sealed tight
-UP	• Check	system water			pressure/system
	piping/expansion tank
	• Check control settings
START
	• Check	ignition		and	flame	sense
	electrodes (sand off any deposits; clean
ANNUAL	and reposition)
	• Check wiring and connections
	• Perform		start-up		checkout	and
	performance verification per Section 10
	of this manual.
	• Flame inspection (stable, uniform)
	• Flame signal (at least 10 microamps at
	high fire)
	• Clean the heat exchanger if flue
	temperature is more than 54°F above
	return water temperature.

If combustion or performance indicate need:

•Clean heat exchanger

•Remove and clean burner using compressed air only

•Clean the blower wheel

Owner maintenance

(see the Knight Wall Mount User’s Information

Manual for instructions)

	• Check boiler area
Daily	• Check pressure/temperature
	gauge

	• Check vent piping
	• Check air piping
Monthly	• Check air and vent termination
	screens
	• Check relief valve
	• Inspect condensate drain system
	• Check air vents
Periodically	• Test low water cutoff (if used)
	• Reset button (low water cutoff)
	• Check boiler piping (gas and
Every	water) for leaks
6 months	• Operate relief valve

End	• Shut boiler down (unless boiler
of season
	used for domestic hot water)
months

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