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Remove the fi lter:
• Disconnect the electrical power to the water heater.
• Close the shutoff valves on both the hot-water and
cold-water lines.
• Unlock the door by rotating the side lock counter-
clockwise with a wide, slot screwdriver.
• Pop the top and bottom door pins by pushing the pins
out, using a small screwdriver. Open the door.
• Open a nearby hot water faucet to depressurize the
water tank.
• Drain the tank following the instructions in the "Draining
The Tank" section.
• Unscrew the fi lter and clean by rinsing it under a faucet
and scrubbing with a brush if required.
Heat
Engine
Cabinet
Water
Inlet Filter
Water Inlet
Fitting
FIGURE 38
Install the fi lter:
• Install the clean fi lter.
• Close the drain valve.
• Open the shutoff valves on both the hot-water and
cold-water lines.
• Fill the tank following the instructions in the
"Filling The Water Heater" section in this Manual.
• Close and lock the door.
• Reconnect the electrical power to the water heater.
• Restart the water heater following the Lighting
Instructions found in the Operating Manual.
CLEANING THE HEAT ENGINE
It is imperative that the control compartment burner and
circulating air passageways of the appliance is kept
clean.
• Turn off and disconnect the electrical power. Allow to
cool.
• Remove and clean the water inlet fi lter. See "Cleaning
The Inlet Water Filter" section.
• Remove the front panel.
• Use a low air pressure to remove dust from the main
burner, heat exchanger, and blower. Do not use a wet
cloth or spray cleaners on the burners.
NOTE: Do not use volatile substances such as benzene
and thinners. They may ignite or fade the paint.
FLUSHING THE HEAT EXCHANGER (LIME BUILD-
UP)
The heat exchanger must be cleaned on a regular basis
to reduce lime build-up. The frequency of this cleaning
is dependent on the quality of your local water supply.
Failure to fl ush the appliance will cause damage to the
heat exchanger. Damage caused by lime build-up is not
covered by the unit's warranty.
• Disconnect electrical power to the water heater.
• Close the shutoff valves on both the hot water and cold
water lines.
• Drain the tank using the instructions in the "Draining
The Tank" section.
• Disconnect the hoses joining the tank and the heat
engine (upper hose is water outlet and lower hose is
water inlet).
• Connect addition length of hose (not provided) to
existing hoses. (Note: The heat engine hose is a
3/4" NPT thread which is different for a garden hose
thread.)
5 gallon pail of virgin,
food grade, white
vinegar (or virgin,
food grade,
citric acid).
• Connect a pump to the hose running to the heat
engine water inlet (lower fi tting). We recommend a
submersible utility pump for the circulating pump. (Note:
If a submersible pump is not used, connect a hose from
the circulating pump to the cleaning solution.)
• Pour approximately 4 gallons (15 litres) of virgin, food
grade, white vinegar or citric acid into a 5 gallon or
greater pail.
• Place the "intake" and "output" hoses into the pail of
cleaning solution. If a submersible utility pump is used,
place the pump into the pail of cleaning solution.
• Plug in the circulating pump.
• Connect the electrical power to the water heater and
run the heat engine.
• Operate the heat engine to circulate the cleaning
solution through the system for at least 45 minutes.
(Note: Lower the temperature below 104°F (40°C) or to
vacation mode.) Warning: Water will become hot very
quickly.
www.americanwaterheater.com
Heat
Engine
FIGURE 39
45
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