COOLING MODE
When operating in cooling mode, your heat pump will run in
cooling lnode until the indoor telnperature is lowered to the
level you have selected. Chaextremely 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 holne or office. Your heat pump will work
longer to keep your home or office COlnfortable under these
conditions:
• Entrance doors are frequently opened and closed
• Laundry appliances are being operated
• A shower is running
• More than the ustml number of people are present in the holne or
Office
• More than the normal nulnber of electric lights are in use
• Drapes are open on the SUlmy side of the home or office
HEATING MODE
With the SYSTEM or MODE control of your indoor therlno-
star set to HEAT, your heat pulnp will run in heating lnode until
room telnperature is raised to the level you have selected. Of
course, your heat pulnp will have to operate for longer periods
to lnaintain a COlnfortable environlnent 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 supplelnental heating source such
as electric heat. On cold days and nights, your system will auto-
matically turn on the supplelnental heat in order to lnaintain
the level of COlnfort you have selected.
When your heat pulnp needs additional heat to keep you coin-
fortable, your Carrier electronic therlnostat will turn on the
supplelnental heat (if equipped) and will display the 'AUX
HT" message.
DEFROST MODE
When your heat pump is providing heat to your holne or office and
the outdoor temperature drops below 45°F, lnoisture lnay begin to
freeze on the surthce of the coil. If allowed m build up, this ice would
impede airflow across the cN1and reduce the amount of heat
absorbed from the outside air. So, to maintaha eneigy-efficient
operation, your heat pump has an autolnatic defrost lntxte.
The defrost lnode starts at a preset time intelwal of 90 lninutes,
although, it may be reset to either 30 or 50 lninutes. Defrost
will start at the preset time only if the ice is sufficient to inter-
fere with norlnal heating operation.
After the ice is melted from the coil, or after a maxinaum of 10
lninutes in defrost mode, the unit amomatically switches back
to normal heating operation.
Do not be alarmed if steam or fog appears at the outdoor unit
during defrost mode. Water vapor froln the melting ice may
condense into a mist in the cold omside air.
During certain weather conditions such as heavy snow and
freezing rain it is not uncolnmon for ice to build up on the unit
grille. This is normal for these weather conditions. Do not
attempt to relnove 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 supplelnental 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 lnore than
30 lninutes, switch your therlnostat to EHEAT lnode before
restarting your heat pump. Leave the system in EHEAT lnode
for an alnount of time equal to the power outage. It is not neces-
sary to exceed 12 hrs. (If your camaot deterlnine how long the
power has been oft', leave the system in EHEAT mode for 8 hrs.)
MAIN
ON
OFF
Fig. 4_Main Electrical Disconnect
PERFORMING ROUTINE
MAINTENANCE
With the proper lnaintenance and care, your heat pump will
operate economically and dependably. Maintenance can be
accomplished easily by referring to the following directions.
However, before perforlning lnaintenance, consider these
ilnportant safety precautions:
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.
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.
CHECKTHE AIR FILTER
A dirty air filter will cause excessive strain on the COlnpressor
and blower motor. This can cause the COlnponents to over-heat
and autolnatically shut down. In the worst case, the compo-
nents will tail 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.
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