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

Service Manual

2Maintenance

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 and sealed tight

UP	•Check	system water pressure/system
START-	piping/expansion tank
	• Check control settings
	• Check ignition and flame sense
ANNUAL	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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