Lochinvar KNIGHT 51-211 - Manual (Page 32)

2
Maintenance
(continued)
Service Manual
32
Oiled bearing circulators
1. The circulator shipped with the Knight wall mount 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.
Review with owner
1. Review the Knight Wall Mount User’s Information
Manual with the owner.
2. Emphasize the need to perform the maintenance
schedule specified in the Knight Wall Mount 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 2B - 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.
Table 2B Heat Exchanger Cleaning Kits
Model
Kit
Number
Part
Number
Component
Description
51 - 106 KIT30062
CTN20005 Rear Refractory Cover
MSC20083* Nylon 4" Wheel Brush*
MSC20085 1/4" x 12" Drill Extension
151 - 211 KIT30063
CTN20005 Rear Refractory Cover
MSC20083* Nylon 4" Wheel Brush*
MSC20084 3mm Allen Wrench
MSC20086 1/4" x 24" Drill Extension
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. ƽ WARNING
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.
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.
* Do NOT use a metal brush. Only use the
kit provided brush or an equivalent
replacement nylon brush. ƽ CAUTION