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melt the ice. When in this defrost cycle, it is normal l\_r steam or
fog to rise from the outdoor unit. Do not be alarmed!
• Do not operate your unit in cooling mode when outdoor
temperatures are below 55°F unless your unit was modified
l\_r low-ambient operation.
• Do not operate your unit in heating mode when outdoor
temperatures are above 66°F unless you set your thermostat
to emergency heat mode.
OPERATING YOUR HEAT PUMP
The operation of your heat pump system is controlled by the
indoor thermostat. You simply adjust the thermostat and it
maintains the indoor temperature at the level you select. Most
thermostats l\_rheat pump systems have 3 controls: a temper-
ature control selector, a FAN control, and a SYSTEM or
MODE control.
The temperature control selector is a dial, level, or set of but-
tons that allows you to establish the temperature that you wish
to maintain l\_r your personal coml\_rt. Some thermostats have
2 temperature control selectors: 1l\w setting the temperature
desired during cooling operation, and 1for setting the temper-
ature desired during heating operation. A typical setting l\_r
year-round coml\_rt is 72°E
The FAN control offers 2options forcontrolling the blower: AUTO
and ON. When set to AUTO, the blower runs only when the heat
pump is operating. When set to ON, the blower runs continuously.
Typically. the SYSTEM or MODE control on your thermostat
offers the l\_llowing selections: COOL, OFR HEAT, AUTO,
and EMERGENCY HEAT. Some thermostats may have a sep-
arate switch l\_rEMERGENCY HEAT. The heat pump will not
operate when the SYSTEM OR MODE control is set to OFF.
With the SYSTEM or MODE control set to COOL, your heat
pump will provide cooling when the indoor temperature rises
above the level you wish to maintain. With the SYSTEM or
MODE control set to HEAT, your heat pump will provide
warmth whenever the indoor temperature falls below the level
that you have selected.
The AUTO selection l\mnd on some thermostats provides l\_r
automatic changeover between cooling and heating. With the
SYSTEM or MODE control set to AUTO, cooling operation is
activated when the indoor temperature rises above the thermo-
stat cooling temperature setting, or heating operation is acti-
vated when the indoor temperature drops below the thermostat
heating setting.
Depending on your typical winter heating needs, your home com-
fort system may include a supplementary heating source. The
EMERGENCY HEAT setting (EHEAT) provides for convenient
selection betweeu the 2 heating appliances. Yourheat pump will
operate when the SYSTEM or MODE control is setto HEAT.With
the SYSTEM or MODE control set to EHEAT, the heat pump will
turn offand the supplementzuy heat source will be activated.
In certain geographic areas and in certain applications, supple-
mental heat is not required. Any questions regarding your
application should be directed to your dealel:
Your thermostat may be PROGRAMMABLE or NON-PRO-
GRAMMABLE. A NON-PROGRAMMABLE thermostat does
not allow the temperature settings to be varied throughout the day
or week without physically changing the settings. A PROGRAM-
MABLE thermostat allows various daily temperature changes to
be preset. During the wintel; for example, you may wish to "set
back" the temperature of your home at night, then have the tem-
perature return to normal prior to waking up. The home's temper-
ature can then be lowered again during the day when no one is at
home, but again be at peak comfort level when your family returns
home. During the summel; the opposite changes might be pro-
gramlned. When properly used, the programming can result in
energy savings on your home's heating and cooling.
COOLING MODE
When operating in cooling mode, yonr heat pump will nln in
cooling mode until the indoor temperature is lowered to the
level you have selected. On extremely hot days, your heat
pump will run l\_r longer periods at a time and have shorter
"off' periods than on moderate days.
The l\_llowing are typical conditions that add extra heat and/or
humidity to your home. Your heat pump will work longer to
keep your home coml\_rtable under these conditions:
• Entrance doors are frequently opened and closed,
• Laundry appliances are being operated,
• A shower is running,
• More than the usu_d number of people ale present in the home,
• More than the normal number of electric lights are in use,
• Drapes are open on the sunny side of the home.
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 l\_r longer periods
to maintain a coml\_rtable environment on cooler days and
nights than on moderate ones.
SUPPLEMENTAL HEAT
Ygur heat pnmp is yonr primary heating sonrce. Ygnr 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 comfort your have selected.
DEFROST MODE
When yonr heat pnmp is providing heat to yonr home and the
outdoor temperature drops below 45°F, 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 all; 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.
Alter the ice is melted from the outdoor coil, or alter a maxi-
mum of 10 minutes in defrost mode, the unit automatically
switches back to normal heating operation. The fan will resume
normal operation after a 20-second delay.
Do not be alarmed if steam or l\_g 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\_r ice to bnild up on the
outdoor unit grille. This is normal l\_rthese weather conditions.
Do not attempt to remove the ice from the outdoor unit grille.
This condition will not affect the proper fnnction of the unit
and will clear within a few days.
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