Maintenance; Maintenance And Annual Startup - Lochinvar KNIGHT 400 Service Manual

2

Maintenance

Maintenance and annual startup

Table 2-1 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
• Check system water pressure/system
piping/expansion tank
• Check control settings
• Check ignition and flame sense
electrodes (sand off any deposits; clean
and reposition)
• Check wiring and connections
• Perform
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
28
start-up checkout and
Service Manual
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
• Test low water cutoff (if used)
Periodically
• Reset button (low water cutoff)
• Check boiler piping (gas and
Every
water) for leaks
6 months
• Operate relief valve
• Shut boiler down (unless boiler
End
used for domestic hot water)
of season
months