5
COOLING CYCLE
When operating in the cooling cycle,
your unit will operate until the indoor
temperature is lowered to the level you
have selected on the indoor thermostat.
On extremely hot days, your unit will
operate for longer periods of 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 and force your cooling unit
to work longer to keep your home
comfortable:
• 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
• More than the normal number of
electric lights are in use
• Drapes are open on the sunny side of
the home
HEATING CYCLE
With the SYSTEM or MODE control
of your indoor thermostat set to
HEAT, the heating section of your
home comfort system will operate
until room temperature is raised to
the level you have selected. Of course,
the heating unit will have to operate
for longer periods to maintain a
comfortable environment on cooler
days and nights than on moderate
ones. When the demand is greater than
the capacity of the heat pump alone, the
electric heaters will supplement the heat
pump.
DEFROST CYCLE
When your heat pump is providing
heat to your home and the outdoor
temperature drops below 45
°
F,
moisture may begin to freeze on the
surface of the outdoor-air coil. If
allowed to build up, this ice would
impede airflow across the coil and
reduce the amount of heat absorbed
from outside air. To maintain energy-
efficient operation, your heat pump has
an automatic defrost cycle.
The defrost cycle will occur only if ice
is sufficient to interfere with normal
heating operation. After ice is melted
from the outdoor-air coil, the unit
automatically switches back to normal
heating mode.
Do not be alarmed if steam or fog
appears at outdoor-air exhaust during
the defrost cycle. Water vapor from the
melting ice may condense into a mist in
the cold outdoor air.
EMERGENCY HEAT
The EM HEAT setting on your
thermostat refers to any supplemental
heating appliance included in your
home comfort system. Operation will
be at reduced capacity.
WHY THE GRILLE
OPENINGS OUTSIDE
YOUR HOME ARE
IMPORTANT
Your new heat pump needs air from
outside. In many applications, this air
is drawn from behind the unit
through ducts, running through an
outside wall. The fan pulls air in through
the unit intake, across a radiator-like
coil, then pushes it out through the unit
exhaust vent. (See Fig. 4.) It is very
important that this air pathway be open
and clear to keep your unit working
correctly.
Fig. 4—Airflow Through Unit
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:
Fig. 5—Main Electrical
Disconnect
• THE DISCONNECT SWITCHES
ON THE UNIT MUST BE
TURNED OFF FOR FILTER
MAINTENANCE. FOR ALL
OTHER SERVICE, POWER MUST
BE DISCONNECTED AT THE
MAIN DISCONNECT BOX.
• 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.
CHECK THE AIR FILTER
A dirty air filter reduces the efficiency
of your heat pump and allows lint
and dirt to accumulate on the indoor-air
coil. Lint and dirt on the indoor-air coil
can damage your unit and void the
warranty. The air filter should be
replaced at least once a month.
To remove the filter:
CAUTION
Do not vent a clothes dryer near
the outdoor-air intake opening.
Lint from a clothes dryer will col-
lect on the outdoor-air coil and
cause damage. This is not cov-
ered by the unit warranty.
SUPPLY
INTAKE
EXHAUST
INDOOR-AIR
BLOWER
INDOOR-AIR
COIL
AIR FLOWS
THROUGH
INTAKE
ACROSS
OUTDOOR-AIR
COIL AND OUT
EXHAUST
OUTDOOR-AIR
BLOWER
OUTDOOR-AIR
COIL
DRAIN
OUTLET
AIR FLOWS
THROUGH
INDOOR-AIR
COIL AND
OUT TO
SUPPLY
!
MAIN
ON
OFF
