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Maintenance, Review with owner, Cleaning boiler heat exchanger – Lochinvar Knight Heating Boiler 81-286 User Manual

Page 32: Oiled bearing circulators

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Maintenance

Service Manual

32

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 2-2 - Heat Exchanger Cleaning Kits.

1. Shut

down

boiler:

• Follow the “To Turn Off Gas to Appliance”
instructions for the boiler in Section 10 - Startup of
the Installation and Operation Manual.
• 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.

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.

The boiler contains ceramic fiber
materials. Use care when handling
these materials per the instructions on
page 3 of this manual. Failure to comply
could result in severe personal injury.

ƽ WARNING

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.

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 of the
Installation and Operation Manual.

13. Replace the access cover and restore boiler to operation.

Table 2-2 Heat Exchanger Cleaning Kits

Model

Kit

Number

Part

Number

Component

Description

81

-

106

KIT30062

CTN20005

Rear Refractory Cover

MSC20083* Nylon 4" Wheel Brush*

MSC20085 1/4" x 12" Drill Extension

151

-

286

KIT30063

CTN20005

Rear Refractory Cover

MSC20083* Nylon 4" Wheel Brush*

MSC20084

3mm Allen Wrench

MSC20086 1/4" x 24" Drill Extension

* Do NOT use a metal brush. Only use
the kit provided brush or an equivalent
replacement nylon brush.

ƽ CAUTION

NOTICE

Rope gasket is intended for sealing combustion
(FIG. 2-3). If damaged DO NOT reuse, the
heat exchanger door must be replaced. Consult
factory for replacement heat exchanger door
(kit WTR3080).

ROPE GASKET

CAUTION:

IF GASKET IS DAMAGED

DO NOT REUSE, THE HEAT EXCHANGER DOOR

MUST BE REPLACED.

Figure 2-3 Rope Gasket - Heat Exchanger Door

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.