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SUPPLEMENTAL HEAT
Your heat pulnp is your primary heating source. Your system
may also be equipped with a supplemental heating source such
as electric, gas, or oil. On cold days and nights, your system
will automatically turn on the supplemental heat in order to
maintain the level of comt\_rt your have selected.
DEFROST MODE
When your heat pump is providing heat to your home and the
outdoor teruperature drops below 45°E moisture may begin to
freeze on the surface of the outdoor coil. If allowed to build up,
this ice would impede airflow across the coil and reduce the
amount of heat absorbed from the outside air. So, to maintain
energy-efficient operation, your heat pump has an automatic
defrost mode.
The defrost mode starts at a preset time interval of 90 minutes,
although, it may be reset to either 30, 60, or 120 minutes.
Defrost will start at the preset time only if the ice is sufficient
to interfere with normal heating operation.
After the ice is melted from the outdoor coil, or after a maxi-
mum of 10 minutes in defrost mode, the unit automatically
switches back to normal heating operation. The fan will resume
normal operation alter a 20-second delay.
Do not be alarmed if steam or fog appears at the outdoor unit
during defrost mode. Water vapor from the melting ice may
condense into a mist in the cold outside all:
During certain weather conditions such as heavy snow and
freezing rain it is not uncommon l\w ice to build up on the
outdoor unit grille. This is normal for these weather conditions.
Do not attempt to remove the ice from the outdoor unit grille.
This condition will not affect the proper function of the unit
and will clear within a few days.
restarting your heat pump. Leave the system in EHEAT mode
l\w an amount of time equal to the power outage. It is not nec-
essary to exceed 12 hrs. If you cannot determine how long the
power has been off. leave the system in EHEAT mode t\_r 8 hrs.
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 l\_llowing directions.
However. bet\_re pertiwming maintenance, consider these
important safety precautions.
Disconnect all electrical power to the indoor air
handler or furnace before removing access pan-
els to perform any maintenance. Disconnect
power to both the indoor and outdoor units.
NOTE: There may be more than one electrical dis-
connect switch. Electric shock can cause per-
sonal injury or death.
Although special care has been taken to minimize
sharp edges in the construction of your unit, be
extremely careful when handling parts or reaching
into the unit. Failure to follow this caution could
result in minor personal injury or product and
property damage.
MAIN
ON
OFF
Fig. 4wMain Electrical Disconnect
EMERGENCY HEAT MODE
The emergency heat (EHEAT) setting ou your Carrier electron-
ic thermostat can be used to turn off your heat pump and use
only the supplemental heating source (if equipped). The Aux-
iliary Heat Indicator (AUX HT) will be displayed while your
system is operating in EHEAT mode.
Emergency heat is not normally used. There may be situations,
however, when it is necessary, such as when your heat pump
requires servicing.
If the electricity to your heat pump has been off for more than
30 minutes, switch your thermostat to EHEAT mode before
CHECKTHE AIR FILTER
A dirty air filter will cause excessive strain OUthe 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 similal: 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
extra filter on hand. This allows you to rotate between the two
with minimal downtime for your comt\,rt system. Extra filters
may be purchased from your dealer.
There are no filters in the outdoor unit of a split systeru. If your
indoor unit is a gas or oil furnace, refer to your furnace User's
Manual tier filter location and procedures l\_rreplacement or
cleaning.
If your system includes an indoor thn 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 filtel; being cer-
tain to secure filter behind lower flange. When reinstalling cover
plate, secure plate behind upper flange then slide tabs outward.
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