3
COOLING MODE
When operating in cooling mode, your heat pump will run in
cooling mode until the indoor temperature is lowered to the
level you have selected. On extremely hot days, your heat
pump will run for longer periods at a time and have shorter
“off” periods than on moderate days.
The following are typical conditions that add extra heat and/or
humidity to your home or office. Your heat pump will work
longer to keep your home or office comfortable under these
conditions:
• Entrance doors are frequently opened and closed
• Laundry appliances are being operated
• A shower is running
• More than the usual number of people are present in the home or
office
• More than the normal number of electric lights are in use
• Drapes are open on the sunny side of the home or office
HEATING MODE
With the SYSTEM or MODE control of your indoor thermo-
stat set to HEAT, your heat pump will run in heating mode until
room temperature is raised to the level you have selected. Of
course, your heat pump will have to operate for longer periods
to maintain a comfortable environment on cooler days and
nights than on moderate ones.
SUPPLEMENTAL HEAT
Your heat pump is your primary heating source. Your system
may also be equipped with a supplemental heating source such
as electric heat. On cold days and nights, your system will auto-
matically turn on the supplemental heat in order to maintain
the level of comfort you have selected.
When your heat pump needs additional heat to keep you com-
fortable, your Carrier electronic thermostat will turn on the
supplemental heat (if equipped) and will display the “AUX
HT” message.
DEFROST MODE
When your heat pump is providing heat to your home or office and
the outdoor temperature drops below 45°F, moisture may begin to
freeze on the surface of the 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 or 50 minutes. Defrost
will start at the preset time only if the ice is sufficient to inter-
fere with normal heating operation.
After the ice is melted from the coil, or after a maximum of 10
minutes in defrost mode, the unit automatically switches back
to normal heating operation.
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 air.
During certain weather conditions such as heavy snow and
freezing rain it is not uncommon for ice to build up on the unit
grille. This is normal for these weather conditions. Do not
attempt to remove the ice from the unit grille. This condition
will not affect the proper function of the unit and will clear
within a few days.
EMERGENCY HEAT MODE
This allows your supplemental heating source to keep your
home or office 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 neces-
sary to exceed 12 hrs. (If your cannot determine how long the
power has been off, leave the system in EHEAT mode for 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 following directions.
However, before performing maintenance, consider these
important safety precautions:
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.
WARNING
Disconnect all electrical power to the indoor air han-
dler or furnace before removing access panels to per-
form any maintenance. Disconnect power to the unit.
Note: There may be more than 1 electrical disconnect
switch. Electrical shock could cause severe injury or
death.
CAUTION
Although special care has been taken to minimize
sharp edges in the construction of your unit, be ex-
tremely careful when handling parts or reaching into
the unit.
Fig. 4—Main Electrical Disconnect
MAIN
ON
OFF
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