Lochinvar Crest 751 - 11 Maintenance; Maintenance and Annual Startup

56
Installation & Operation Manual
11 Maintenance
Maintenance and annual startup
Table 11A Service and Maintenance Schedules
Service technician
(see the following pages for instructions)
General:
• Address reported problems, if any
• 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 the ignition and both flame sense
electrodes (sand off any deposits; clean
and reposition)
• Check wiring and connections
• Perform start-up checkout and
performance verification per Section 9.
• Flame inspection (stable, uniform)
• Check both flame signals (at least 10
microamps at high fire)
• Clean the heat exchanger
• Test low water cutoff (reference the
Crest Service Manual).
If combustion or performance
indicate need:
• Clean heat exchanger
• Remove and clean burner using
compressed air only
• Clean the blower wheels
ANNUAL START-UP
Owner maintenance
(see the Crest User’s Information Manual for
instructions)
Daily
• Check boiler area
• Check pressure/temperature
gauge
Monthly
• Check vent piping
• Check air piping
• Check air and vent termination
screens
• Check relief valve
• Check condensate drain system
Every
6 months
• Test low water cutoff
• Reset button (low water
cutoff)
• Check boiler piping (gas and
water) for leaks
• Operate relief valve
End
of season
months
• Shut boiler down (unless boiler
used for domestic hot water)