Lochinvar Armor 150 - 500 - 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.
Cleaning water heater heat
exchanger
1. Shut down water heater:
• Follow the “To Turn Off Gas to Appliance” instructions
for the water heater in the Armor Water Heater
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 blower assembly (gas air/arm) from the heat
exchanger access cover. Set bolts aside.
4. Remove the nuts securing the heat exchanger access cover to
the heat exchanger and set aside.
5. Remove the heat exchanger access cover, cover gasket(s) and
chamber insulation assembly.
The water heater contains ceramic fiber
materials. Use care when handling these
materials per instructions on page 3 of this
manual. Failure to comply could result in
severe personal injury.
6. Use a vacuum cleaner to remove any accumulation on the
water heater heating surfaces. Do not use any solvent.
7. Finish cleaning using a clean cloth dampened with warm
water.
8. Install access cover gasket, chamber insulation assembly and
cover.
9. Secure nuts on the studs. DO NOT overtighten.
10. Re-install the blower assembly (gas air/arm) using the bolts
set aside in Step 3.
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. When the water heater has been flushed, restore water
heater to operation.
13. Perform start-up and check-out procedures in the Armor
Water Heater Installation and Operation Manual.
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.
ƽ WARNING