Lochinvar ARMOR 150 - 800 - Manual (Page 20)

20
Service Manual
2
Maintenance
Check flame signal
1. At high fire the flame signal shown on the display
should be at least 10 microamps.
2. A lower flame signal may indicate a fouled or damaged
flame sense electrode. If cleaning the flame sense
electrode does not improve, ground wiring is in good
condition, and ground continuity is satisfactory,
replace the flame sense electrode.
3. See Section 3 - Troubleshooting in this manual for
other procedures to deal with low flame signal.
Review with owner
1. Emphasize the need to perform the maintenance
schedule specified in this manual.
2. Remind the owner of the need to call a licensed
contractor should the water heater or system exhibit
any unusual behavior.
3. Remind the owner to follow the proper shutdown
procedure and to schedule an annual start-up at the
beginning of the next heating season.
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.
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
150 1-1/4" E8 -- 16 16.6 18°F
199 1-1/4" E8 -- 21 11.8 18°F
285 2" E17 -- 30 17.1 18°F
399 2" E24 -- 39 21 18°F
500 2" E22 -- 53 26 18°F
600 2" E22 -- 53 26 22°F
700 2" -- TP 40-160 63 32 22°F
800 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. ƽ 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.
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.
Table 2B Heat Exchanger Cleaning Kits
Model
Kit
Number
Part
Number
Component
Description
150
-
399
KIT30063
CTN20005 Rear Refractory Cover
MSC20083* Nylon 4" Wheel Brush*
MSC20084 3mm Allen Wrench
MSC20086 1/4" x 24" Drill Extension
500
-
800
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. ƽ 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.