Navien NFB-175H User's Information Manual page 18

WARNING
Follow the service
●
procedures given throughout this manual
and in component literature shipped with
the boiler. Failure to perform the service and
maintenance could result in damage to the
boiler or system.
Failure to follow the directions in this manual
●
and component literature could result in
severe personal injury, death, or substantial
property damage.
The boiler should be inspected annually only
●
by a qualified service technician. In addition,
the maintenance and care of the boiler must
be performed to assure maximum boiler
efficiency and reliability. Failure to service
and maintain the boiler and system could
result in equipment failure.
Electrical shock hazard – Turn off power
●
to the boiler before any service operation
on the boiler except as noted otherwise in
this instruction manual. Failure to turn off
electrical power could result in electrical
shock, causing severe personal injury or
death.
Addressing the Reported Problems
Inspect any problems reported by the owner and
correct before proceeding.
Inspecting the Installation Area
1. Verify that boiler area is free of any combustible
materials, gasoline and other flammable vapors
and liquids.
2. Verify that air intake area is free of any of the
contaminants listed in Installation & Operation
Manual. If any of these are present in the boiler
intake air vicinity, they must be removed. If they
cannot be removed, reinstall the air and vent
lines per the Installation and Operation Manual.
18 Maintaining the Boiler
and maintenance
Inspecting the Boiler Interior
1. Remove the front cover and inspect the interior
of the boiler.
2. Vacuum any sediment from inside the boiler
and components. Remove any obstructions.
Cleaning the Condensate Trap
1. Inspect the condensate drain line, condensate
fittings, and condensate trap.
2. Remove any sediment in the trap.
3. Fill with fresh water until the water begins to
pour out of the drain.
Checking all Piping for Leaks
Eliminate all system or boiler leaks. Continual fresh
makeup water will reduce boiler life. Minerals
can build up in sections, reducing heat transfer,
overheating heat exchanger, and causing heat
exchanger failure. Leaking water may also cause
severe property damage.
1. Inspect all water and gas piping and verify to be
leak free.
2. Look for signs of leaking lines and correct any
problems found.
Checking the Flue Vent System and Air
Piping
1. Visually inspect the entire flue gas venting
system and air piping for blockage,
deterioration or leakage. Repair any joints that
show signs of leakage. Verify that air inlet pipe is
connected and properly sealed (if installed).
2. Verify that boiler vent discharge and air intake
are clean and free of obstructions.
WARNING
Failure to inspect for the above conditions and
have them repaired can result in severe personal
injury or death.