Performing Routine Maintenance; Indoor Coil; Outdoor Coil - Carrier HEAT PUMP Manual

ing season, if the thermostat ever displays the "TROUBLE"
message, switch your thermostat to EHEAT mode and call
your dealer. This allows your supplemental heating source to
keep your home warm until your heat pump can be serviced.
Also, if the electricity to your heat pump has been off for more
than 30 minutes, switch your thermostat to EHEAT mode
before restarting your heat pump. Leave the system in EHEAT
mode for an amount of time equal to the power outage. It is not
necessary to exceed 12 hrs. If your cannot determine how long
the power has been off, leave the system in EHEAT mode for
8 hrs.
Fig. 4—Main Electrical Disconnect
PERFORMING ROUTINE
MAINTENANCE
With the proper maintenance and care, your heat pump will
operate economically and dependably. Maintenance can be
accomplished easily by referring to the following directions.
However, before performing maintenance, consider these
important safety precautions:
• DISCONNECT ALL ELECTRICAL POWER TO THE
INDOOR AIR HANDLER OR FURNACE BEFORE
REMOVING ACCESS PANELS TO PERFORM ANY
MAINTENANCE. Disconnect power to both the indoor and
outdoor units. NOTE: THERE MAY BE MORE THAN 1
ELECTRICAL DISCONNECT SWITCH.
• ALTHOUGH SPECIAL CARE HAS BEEN TAKEN TO
MINIMIZE SHARP EDGES IN THE CONSTRUCTION OF
YOUR UNIT, BE EXTREMELY CAREFUL WHEN HAN-
DLING PARTS OR REACHING INTO THE UNIT.
CHECK THE AIR FILTER
A dirty air filter will cause excessive strain on the compressor
and blower motor. This can cause the components to over-heat
and automatically shut down. In the worst case, the compo-
nents will fail and need to be replaced. To avoid inefficient or
failed operation of your unit, CHECK THE FILTER(S)
EVERY 3 TO 4 WEEKS. Replace filter(s) when necessary, or
clean the filter(s) if you have the reusable type.
Disposable filters should be replaced by similar, new filters of
the same dimensions.
Reusable, permanent filters should be washed in a solution of
cold water and mild detergent, then rinsed and thoroughly
dried. THE FILTER MUST BE COMPLETELY DRY
BEFORE BEING REINSTALLED. To avoid prolonged shut-
down of your unit while a filter is drying, you should have an
MAIN
ON
OFF
extra filter on hand. This allows you to rotate between the 2
with minimal downtime for your comfort system. Extra filters
may be purchased from your dealer.
There are no filters in the outdoor unit of a split system. If your
indoor unit is a gas or oil furnace, refer to your furnace User's
Manual for filter location and procedures for replacement or
cleaning.
If your system includes an indoor fan coil unit, the filter may
be located in the unit where it connects with the return-air duct
or plenum. (See Fig. 5.) Remove the filter cover plate by sliding
latches toward center of plate. Lift filter to clear lower flange.
Filter is spring-loaded and will "pop out." Reinstall filter, being
certain to secure filter behind lower flange. When reinstalling
cover plate, secure plate behind upper flange then slide tabs
outward.
Fig. 5—Removing Filter from Fan Coil Unit
The indoor fan coil unit may be located in the attic. In this
instance the filter may be located behind the return air grille.
Access the filter by removing the return air grille.
If your system includes a high efficiency or electronic air
cleaner, refer to air cleaner User's Manual for proper filter
cleaning or replacement.

INDOOR COIL

If the split-system coil has only been operated with a clean
filter in place, it should require minimal cleaning.
If coil cleaning is required, call your dealer for service. It may
be necessary to clean the coil with a detergent solution and
rinse it with water. This could require the removal of the coil.
You should not attempt this yourself.

OUTDOOR COIL

If grass clippings, leaves, shrubbery, and debris are kept away
from the outdoor unit, minimal care should be sufficient to
keep the system functioning properly. For proper drainage,
debris must be removed periodically from the base pan. How-
ever, if the outdoor coil becomes dirty, use a vacuum cleaner
or shop vac with soft brush attachment to clean the exterior
surface. Vacuum coil surface using an up and down motion. Be
careful not to bend or damage fins.
If dirt is deep in the coil, contact your dealer for service. The
outdoor fan motor may have to be disconnected and the top
panel removed to gain access to the coil for thorough cleaning.
Do not attempt this yourself.
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