Haier GE Appliances NS18AT Service Manual page 22

Outdoor Coil (cont)
NOTICE !
Failure to follow instructions will cause damage to
the unit.
This unit is equipped with an aluminum coil. Alu-
minum coils may be damaged by exposure to solu-
tions with a pH below 5 or above 9. The aluminum
coil should be cleaned using potable water at a
moderate pressure (less than 50psi). If the coil can-
not be cleaned using water alone, GE Appliances
recommends use of a coil cleaner with a pH in the
range of 5 to 9. The coil must be rinsed thoroughly
after cleaning.
In coastal areas, the coil should be cleaned with po-
table water several times per year to avoid corrosive
buildup (salt).
Indoor Unit
1. Clean or change filters.
2. The blower motors are prelubricated and permanently
sealed. No more lubrication is needed.
3. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
4. Belt Drive Blowers - Check belt for wear and proper ten-
sion.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amp draw on blower motor.
Motor Nameplate:_________ Actual:__________.
Indoor Coil
1 - Clean coil if necessary.
2 - Check connecting lines, joints and coil for evidence
of oil leaks.
3 - Check condensate line and clean if necessary.
HOMEOWNER
Cleaning of the outdoor unit's coil should be performed by
a trained service technician. Contact your dealer and set
up a schedule (preferably twice a year, but at least once
a year) to inspect and service your outdoor unit. The fol-
lowing maintenance may be performed by the homeowner.
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure
of the unit to treated water (i.e., sprinkler systems,
soakers, waste water, etc.) will corrode the surface of
the steel and aluminum parts, diminish performance
and affect longevity of the unit.
The outdoor unit must be properly maintained to ensure its
proper operation.
• Please contact your dealer to schedule proper inspec-
tion and maintenance for your equipment.
• Make sure no obstructions restrict airflow to the outdoor unit.
• Grass clippings, leaves, or shrubs crowding the unit can
cause the unit to work harder and use more energy.
• Keep shrubbery trimmed away from the unit and peri-
odically check for debris which collects around the unit.
In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow pre-
vent your unit from operating at its most efficient level.
1 - Air Filter – Ask your GE Appliances dealer to show
you where your indoor unit's filter is located. It will be
either at the indoor unit (installed internal or external
to the cabinet) or behind a return air grille in the
wall or ceiling. Check the filter monthly and clean or
replace it as needed.
2 - Disposable Filter – Disposable filters should be
replaced with a filter of the same type and size.
NOTE – If you are unsure about the filter required for your
system, call your GE Appliances dealer for assistance.
3 - Reusable Filter – Many indoor units are equipped
with reusable foam filters. Clean foam filters with a mild
soap and water solution; rinse thoroughly; allow filter
to dry completely before returning it to the unit or grille.
NOTE – The filter and all access panels must be in place
any time the unit is in operation.
4 - Electronic Air Cleaner – Some systems are
equipped with an electronic air cleaner, designed
to remove airborne particles from the air passing
through the cleaner. If your system is so equipped,
ask your dealer for maintenance instructions.
5 - Indoor Unit – The indoor unit's evaporator coil is
equipped with a drain pan to collect condensate
formed as your system removes humidity from the
inside air. Have your dealer show you the location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)
See the thermostat homeowner manual for instructions on
how to operate your thermostat.
If your system fails to operate, check the following before
calling for service:
• Verify room thermostat settings are correct.
• Verify that all electrical disconnect switches are ON.
• Check for any blown fuses or tripped circuit breakers.
• Verify unit access panels are in place.
• Verify air filter is clean.
• If service is needed, locate and write down the unit mod-
el number and have it handy before calling.
Page 22
Outdoor Coil
Routine Maintenance
Thermostat Operation
Preservice Check
31-5000747 Rev. 0