Review With Owner; Cleaning Boiler Heat Exchanger; Oiled Bearing Circulators - Lochinvar 81 - 286 Installation And Operation Manual

12
Maintenance

Review with owner

1. Review the Knight Boiler User's Information Manual
with the owner.
2. Emphasize the need to perform the maintenance schedule
specified in the Knight 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.

Cleaning boiler heat exchanger

For recommended materials; including brush, appropriate
extension(s), refractory cover, and detailed instructions see
Table 12B - Heat Exchanger Cleaning Kits.
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 nuts securing the heat exchanger access
cover to the heat exchanger and set aside.
4. Remove the heat exchanger access cover, burner, and
gas/air arm assembly.
The boiler contains ceramic fiber
WARNING
materials. Use care when handling these
materials per instructions in the Service
Manual. Failure to comply could result in
severe personal injury.
5. Remove the condensate hose from the heat exchanger
end. Connect a field supplied 3/4" diameter hose to
a drain pan. Using field supplied means, cover the
refractory in the back of the combustion chamber of the
heat exchanger.
6. Use a vacuum cleaner to remove any accumulation on the
boiler heating surfaces. Do not use any solvent.
7. Brush the heat exchanger while dry using a nylon bristle
brush. Caution: DO NOT use a metal brush. Re-vacuum
the heat exchanger.
8. Finish cleaning using a clean cloth dampened with warm
water. Rinse out debris with a low pressure water supply.
9. Allow the heat exchanger to thoroughly dry.
10. Remove the field supplied rear refractory cover from the
back of the combustion chamber of the heat exchanger
and reassemble.
76
Installation & Operation Manual
11. Close isolation valves on piping to isolate boiler from
system. Attach a hose to the boiler drain and flush boiler
thoroughly with clean water by using purging valves to
allow water to flow through the water make-up line to the
boiler.
12. Perform start-up and check-out procedures in the Check
Flame and Combustion - Section 10 - Startup on pages 57
and 59 of this manual.
13. Replace the access cover and restore boiler to operation.
Table 12B Heat Exchanger Cleaning Kits
Kit
Model
Number Number
CTN20005
81
- KIT30062 MSC20083* Nylon 4" Wheel Brush*
106
MSC20085 1/4" x 12" Drill Extension
CTN20005
151
MSC20083* Nylon 4" Wheel Brush*
- KIT30063
MSC20084
286
MSC20086 1/4" x 24" Drill Extension
* Do NOT use a metal brush. Only use
CAUTION
the kit provided brush or an equivalent
replacement nylon brush.
Figure 12-3 Rope Gasket - Heat Exchanger Door
CAUTION:
IF GASKET IS DAMAGED
DO NOT REUSE, THE HEAT EXCHANGER DOOR
MUST BE REPLACED.
Rope gasket is intended for sealing combustion
NOTICE
(FIG. 12-3). If damaged DO NOT reuse, the
heat exchanger door must be replaced. Consult
factory for replacement heat exchanger door
(kit WTR3080).

Oiled bearing circulators

1. The circulator shipped with the Knight boiler is water-
lubricated. No oiling is required.
2. Check other circulators in the system. Oil any circulators
requiring oil, following circulator manufacturer's
instructions. Over-oiling will damage the circulator.
3. Replace the boiler front access cover.
Part Component
Description
Rear Refractory Cover
Rear Refractory Cover
3mm Allen Wrench
ROPE GASKET