Service Manual

2 Maintenance (continued)
Check Delta T
1. Check the Delta T using Table 2C as a reference.
Water Heater Pump Applications
Model
*Pipe
Size
Armstrong Grundfos
Flow Rate
(GPM)
Loss
(FT/HD)
Temp.
Rise
151 1-1/4" E8 -- 16 16.6 18°F
200 1-1/4" E8 -- 21 11.8 18°F
286 2" E17 -- 30 17.1 18°F
400 2" E24 -- 39 21 18°F
501 2" E22 -- 53 26 18°F
601 2" E22 -- 53 26 22°F
701 2" -- TP 40-160 63 32 22°F
801 2" -- TP 40-160 67 31 24°F
Table 2C Water Heater Pump Applications / Recommended
Temperature Rise
The water heater 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.
 WARNING
Cleaning 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 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.
Table 2B Heat Exchanger Cleaning Kits
Model
Kit
Number
Part
Number
Component
Description
151
-
400
KIT30063
CTN20005 Rear Refractory Cover
MSC20083* Nylon 4" Wheel Brush*
MSC20084 3mm Allen Wrench
MSC20086 1/4" x 24" Drill Extension
501
-
801
KIT30064
CTN20005 Rear Refractory Cover
MSC20083* Nylon 4" Wheel Brush*
MSC20085 1/4" x 12" Drill Extension
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.
 CAUTION
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.
Oiled bearing circulators
1. The circulator shipped with the Armor water heater 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.
23
Service Manual
Rope gasket is intended for sealing combustion
(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).
NOTICE
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