Use and Care Manual

ahl-647 Revision Date 7.12.23
15
To ush the tank, attach a hose to the eld installed drain valve.
Close the cold water supply line shut-o valve. Open the drain valve
and hot water faucet(s) to vent heater while draining. Direct the ow
of water to a drain or bucket where it will not cause damage.
Flush until water runs clear to complete this operation. Close drain
valve and reopen the supply line shut-o valve. Close the hot water
faucet(s) once all air has been bled from the system (when water
runs freely). Make certain that the heater is completely full of water
before restoring power.
Periodically (At least twice a year)
Check around the water heater and related plumbing for leaks. If
the combination temperature and pressure relief valve discharges
periodically, or water is leaking from around the heating elements,
there may be a problem with your water system. DO NOT ATTEMPT
TO REPAIR LEAKS YOURSELF! Contact a qualied service contractor
for assistance.
Check the area around the water heater for ammable liquids or
combustible materials. If any are found, remove from the area.
Vacation (Extended shut-o periods)
During extended mild or warm weather periods when hot water will
not be in use, shut o the electric power to the tank. When hot water
is needed again, restore power to the water heater.
During extended cold weather periods when hot water will not be
in use and prone to freezing conditions, shut o electric power to
the tank, close the supply line shut-o valve, open the drain valve
and drain the water heater to a safe drainage location (as detailed
previously). Once drained, close the drain valve. When hot water is
needed again, restore the water supply to the tank. Once the tank is
full, restore power.
Water drained from the water heater may be scalding hot. Take
care to avoid scalding. Wear gloves and safety glasses, and direct
water to a safe drainage location. It is recommended to turn
power o to the water heater and run water at a hot water faucet
until it cools BEFORE draining water from the heater. Failure to
comply with this warning could result in property damage, severe
personal injury, or death.
Water drained from the water heater may be scalding hot. Take
care to avoid scalding. Wear gloves and safety glasses, and direct
water to a safe drainage location. It is recommended to turn
power o to the water heater and run water at a hot water faucet
until it cools BEFORE draining water from the heater. Failure to
comply with this warning could result in property damage, severe
personal injury, or death.
The maintenance activities described below are only to be
performed by the Installer / Qualied Service Provider. These
maintenance items should be performed during recommended
annual service and any service calls.
1. Ask the owner / user if there have been any issues with the water
heater. Diagnose any heater issues and repair / replace parts as
necessary.
2. Check the water heater and related plumbing for leaks. Repair any
that are found.
3. Check the area around the water heater for ammable liquids or
combustible materials. If any are found, remove from the area.
4. Check the heating elements while the heater is in operation. If
the elements are hissing / singing excessively, they may need to be
cleaned. Inspect the elements and clean if necessary.
5. Inspect the Temperature and Pressure (T&P) Relief Valve. See
instructions below.
6. Turn power supply o to the water heater. Open the drain valve
and drain a few gallons of water from the tank to clear any hard
T&P Relief Valve Maintenance Instructions:
• Annually: Certain naturally occuring mineral deposits may
adhere to the valve, blocking waterways and rendering the
valve inoperative. The T&P Relief Valve lever must be operated
to ensure the waterways are clear. If waterways are clear, hot
water will discharge from the valve. Take precautions to avoid
personal injury and property damage from contact with hot
water. Before operating lever, check to see that a discharge
line is connected to the valve, directing the ow of hot water
from the valve to a proper place of disposal.
• Replacement of the valve is required if no water ows when
the lever is operated. Turn the water heater o until the valve
is replaced.
• If water ows from the valve, drain a few gallons from the tank
to ensure the water ows freely.
• At least once every three years: To ensure that the T&P
valve has not been aected by corrosive water conditions
and that the valve and discharge line have not been altered
or tampered with illegally, relief valves should be inspected,
and replaced, if necessary, by a licensed plumbing contractor
or qualied service technician.
Failure to comply with these guidelines could result in failure
of relief valve operation, and possibly result in substantial
property damage, severe personal injury, or death.
water deposits. Once complete, close the drain valve and restore
power to the water heater.