Installation & Operation Manual
Review with owner
1. Review the Knight Wall Hung Fire Tube Boiler User’s
Information Manual with the owner.
2. Emphasize the need to perform the maintenance schedule
specified in the Knight Wall Hung Fire Tube Boiler
User’s Information Manual (and in this manual as well).
3. Remind the owner of the need to call a licensed contractor
should the boiler or system exhibit any unusual behavior.
4. Remind the owner to follow the proper shutdown
procedure and to schedule an annual start-up at the
beginning of the next heating season.
12
Maintenance
(continued)
Cleaning boiler heat exchanger
1. Shut down boiler:
• Follow the “To Turn Off Gas to Appliance” instructions
for the boiler in Section 10 - Startup.
• Do not drain the boiler unless it will be exposed to
freezing temperatures. If using freeze prevention fluid
in system, do not drain.
2. Allow time for the boiler to cool to room temperature if
it has been firing.
3. Remove the front access panel (no tools required for
removal). Use a Phillips head screwdriver to remove the
top access panel.
4. Remove the wiring from the ignitor, flame rod, and the
fan. Remove the reference tubing from the air intake.
5. Loosen the band clamp on the air intake coupling using
a field provided 5/16" driver and disconnect the air inlet
from the venturi.
6. On Models WH56 - WH286 loosen the threaded nut
on the venturi. Remove the gasket between the gas
piping and venturi. On the WH400 model disconnect
the Molex plug from the gas valve. Using a 5 mm Allen
wrench, remove the screws securing the gas pipe to the
gas valve.
7. Remove the 10 mm nuts securing the heat exchanger top
plate to gain access to the heat exchanger and set aside.
83
8. Remove the condensate trap from the bottom of the
boiler. Place a bucket underneath the condensate fitting
attached to the heat exchanger.
9. Use a vacuum cleaner to remove any accumulation on the
boiler heating surfaces. Do not use any solvent.
10. Using a clean cloth dampened with warm water, wipe out
the combustion chamber. Rinse out debris with a low
pressure water supply.
11. Allow the heat exchanger to thoroughly dry.
12. Reassemble the unit in reverse order of component
removal, and re-install the condensate hose.
13. Perform a combustion analysis by following the
instructions in Section 10 - Startup - Check Flame and
Combustion on page 63 of this manual.
14. Resume operation.
The boiler contains ceramic fiber
materials. Use care when handling these
materials per instructions in the Service
Manual. Failure to comply could result in
severe personal injury.
WARNING
CAUTION
Damaged gaskets and seals in the
system can result in substantial property
damage. Ensure that damaged or torn
gaskets are replaced.
