Cleaning Heat Exchanger; Check Delta T; Oiled Bearing Circulators - Lochinvar 151 - 801 Service Manual

2
Maintenance

Cleaning heat exchanger

For recommended materials;
appropriate extension(s), refractory cover, and detailed
instructions see Table 2B - Heat Exchanger Cleaning
Kits.
1. Shut down water heater:
• Follow the "To Turn Off Gas to Appliance"
instructions for the water heater in Section 10 -
Startup of the Installation and Operation Manual.
• Do not drain the water heater unless it will be
exposed to freezing temperatures. If using freeze
prevention fluid in system, do not drain.
2. Allow time for the water heater 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 water heater contains ceramic
WARNING
fiber materials.
handling these materials per the
instructions on page 3 of this 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 water heater 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 water
heater from system. Attach a hose to the water
heater drain and flush water heater thoroughly with
clean water by using purging valves to allow water
to flow through the water make-up line to the water
heater.
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 water heater to
operation.
(continued)
Table 2B Heat Exchanger Cleaning Kits
including brush,
Model
Figure 2-3 Rope Gasket - Heat Exchanger Door
Use care when

Check Delta T

1. Check the Delta T using Table 2C as a reference.
Table 2C Water Heater Pump Applications / Recommended
Temperature Rise
Model
151
200
286
400
501
601
701
801

Oiled bearing circulators

1. The circulator shipped with the outdoor water heater is water-
lubricated. No oiling is required.
2. Check other circulators in the system.
requiring oil, following circulator manufacturer's instructions.
Over-oiling will damage the circulator.
Outdoor Armor Water Heater Service Manual
Kit Part
Number Number
CTN20005
151
MSC20083*
- KIT30063
MSC20084
400
MSC20086
CTN20005
501
MSC20083*
- KIT30064
MSC20085
801
MSC20086
* Do NOT use a metal brush. Only use the kit
CAUTION
provided brush or an equivalent replacement
nylon brush.
CAUTION:
IF GASKET IS DAMAGED
DO NOT REUSE, THE HEAT EXCHANGER DOOR
MUST BE REPLACED.
Rope gasket is intended for sealing combustion
NOTICE
(see FIG. 2-3). If gasket is damaged DO NOT
reuse, the heat exchanger door must be replaced.
Consult factory for replacement heat exchanger
door (kit WTR3080 and WTR3086).
Water Heater Pump Applications
*Pipe
Armstrong Grundfos
Size
1-1/4" E8 --
1-1/4" E8 --
2" E17 --
2" E24 --
2" E22 --
2" E22 --
2" -- TP 40-160
2" -- TP 40-160
Component
Description
Rear Refractory Cover
Nylon 4" Wheel Brush*
3mm Allen Wrench
1/4" x 24" Drill Extension
Rear Refractory Cover
Nylon 4" Wheel Brush*
1/4" x 12" Drill Extension
1/4" x 24" Drill Extension
ROPE GASKET
Flow Rate Loss Temp.
(GPM) (FT/HD) Rise
16 16.6 18°F
21 11.8 18°F
30 17.1 18°F
39 21 18°F
53 26 18°F
53 26 22°F
63 32 22°F
67 31 24°F
Oil any circulators
23