Maintenance And Service; Routine Maintenance - A.O. Smith AWH-35 Instruction Manual

ROUTINE MAINTENANCE

Warning: When possible, disconnect all power to the unit and
follow the prescribed lock - out/tag - out procedure to prevent
accidental electrocution. Should the unit have to be serviced
with live electricity, only trained and qualified technicians should
carry out the service. Failure to follow all of the safety warnings
may result in serious injury or death.
The temperature-pressure relief valve must be manually operated
at least once a year. Caution should be taken to ensure that (1)
no one is in front of or around the outlet of the temperature-
pressure relief valve discharge line, and (2) the water manually
discharged will not cause any bodily injury or property damage
because the water may be extremely hot. If after manually
operating the valve, it fails to completely reset and continues to
release water, immediately close the cold water inlet to the heat
pump, follow the draining instructions in the storage tank manual,
and replace the temperature-pressure relief valve with a properly
rated/sized new one.
If you do not understand these instructions or have any questions
regarding the temperature-pressure relief valve call the toll free
number listed on the back cover of this manual for technical
assistance.
AIR FILTERS
Note: If return duct is connected to the unit, be sure to install a
filter access door.
Initially, check filters on a monthly basis for dust buildup. Replace
throw-away cotton media filters when necessary with new filters.
Make sure the arrows on the filter are pointing in the direction of
the air flow.
An aluminum mesh filter should be used for applications with
significant grease or dust buildup. To clean, wash under a stream
of hot water to remove the dirt and lint. To remove grease, apply
a grease cutting soap and thoroughly rinse. Allow the filter to dry.
Reinstall the filter.
DRAIN PAN
Warning: Read all of the warnings on the bottle of the cleaning
products used for drain pan cleaning. Follow all instructions for
personal protection and safe application of the products. Before
cleaning the drain pan, disconnect all power to the unit and follow
the prescribed lock-out/tag-out procedure.
The condensate pan and drain line must be checked for
cleanliness, growth and blockage at least every six months.
To clean drain pan, start by disconnecting the power to the unit.
Wear the appropriate personal protective equipment prescribed
by the cleaning product instructions. Apply the cleaning solution
and scour the sides of and bottom of the drain pan. Remove all
large solid particles that could potentially clog up the drain line.
If algae or mold are found growing in the pan, after cleaning,
apply a mild bleach and water solution and brush on the growth
areas. Rinse the drain pan thoroughly with water and dry for a
final visual inspection.
BLOWER ASSEMBLY
Before performing any maintenance on the blower assembly,
disconnect all power to the unit and follow the prescribed lock-
out/tag-out procedure.

MAINTENANCE AND SERVICE

Inspect and tighten all bearing collar and wheel set screws after
the first 50 to 200 hours of operation and there after, at least
every six months. During inspection, visually check the drive belt
for wear or cracking. Replace as necessary, but do not apply any
belt dressing products.
Inspect all set screws on the pulleys, wheel and bearing lock
collars. Check the belt for proper tension and alignment.
Clean the blower wheel periodically as material buildup on the
blades can cause a wheel imbalance that may lead to wheel or
bearing failure.
The pillow block bearings come pre-lubricated from the factory.
These bearings should be lubricated at least once per year.
The recommended lubricant is Shell Alvania #2 or S3. Caution:
overfilling the bearing my rupture the seal and damage the
bearing. Apply the grease slowly as the shaft is rotating.
Motor grease is not compatible for bearings. Only use grease
designated for bearing use.
BLOWER MOTOR
Warning: before performing any maintenance on the blower
motor, disconnect all power to the unit and follow the prescribed
lock-out/tag-out procedure.
Every six months visually inspect the blower motor. Clean off any
dust, grease or oily buildup and vacuum out any cavities in the
motor. It may be necessary to periodically disassemble the motor
for a more thorough internal cleaning.
Motors are permanently lubricated from the factory. It is not
necessary to lubricate the motor upon start-up or lubricate as
part of maintenance.
EVAPORATOR COIL
Warning: Read all of the warnings provided for the cleaning
products used for refrigeration coil cleaning. Follow all
instructions for personal protection and safe application of the
products. Before cleaning evaporator, disconnect all power
to the unit and follow the prescribed lock-out/tag-out procedure.
Inspect the evaporator coil for dirt buildup or fin crush on at least
once per year. If there are signs of fin fold over, use a fin comb
to straighten the fins. Should the coils need cleaning, follow the
steps listed below:
1. Disconnect all power to the unit and follow the prescribed
lock-out/tag-out procedure.
2. Wear the prescribed
prescribed from the cleaning product instructions.
3. Install a block-off sheet to prevent splash over into the dry
sections of the AWH HPWH.
4. Prepare the cleaning solution as prescribed from the cleaning
product instructions and fill the mixture into a high-pressure
sprayer.
5. Start spraying both sides of the coil keeping the nozzle
perpendicular to the coil at least 6 inches from the coil face.
Do not exceed 600 psi.
6. Thoroughly rinse the cleaned coil with cool, clean water.
7. Straighten out any fins displaced during the cleaning using
a fin comb.
8. Confirm the drain pan line is not clogged.
9. Replace all panels on the unit and wipe down any standing
cleaning solution or water on or around the unit.
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personal protective equipment