Lochinvar 400-801 service manual Maintenance Maintenance and annual startup, Service technician

Service Manual

2 Maintenance

Maintenance and annual startup

Table 2-1Service 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
-UP	and sealed tight
	• Check system	water	pressure/system
START
	piping/expansion tank
ANNUAL	• Check control settings
	• Check ignition and flame sense
	electrodes (sand off any deposits; clean
	and reposition)
	• Check wiring and connections
	• Perform start-up checkout and
	performance verification per Section 10
	in the Knight XL Installation and
	Operation 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 (30°C)
	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 XL 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
	• Check condensate drain system
	• Check air vents
Periodically	• Test low water cutoff (if used)
	• Reset button (low water cutoff)
Every	• Check boiler piping (gas and
	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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