Bryant 664A - Manual (Page 3)

The following are typical conditions that add extra heat and/or
humidity to your home. Your heat pump will work longer to
keep your home 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
• 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 switch of your indoor thermostat set to
the HEAT position, the heat pump will operate in its heating
mode 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 colder
days and nights than on moderate ones.
Defrost Cycle — When your heat pump is providing heat to
your home and the outdoor temperature drops below 45 de-
grees Fahrenheit, moisture may begin to freeze on the sur-
face 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
cycle.
The defrost cycle starts at a preset time interval of 30 min-
utes. 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 the Defrost mode, the unit will auto-
matically switch back to normal heating operation.
Do not be alarmed if steam or fog appears at the outdoor unit
during the defrost cycle. Water vapor from the melting ice
may condense into a mist in the cold outside air.
Emergency Heat — The EMERGENCY HEAT setting on your
thermostat refers to any supplementary heating appliance that
may be included in your home comfort system. Operation of
the EMERGENCY HEAT source may be required if heating
demands exceed the capacity of the heat pump, or if the heat
pump malfunctions.
The word Emergency will display on your thermostat if the
mode button is selected for the EMERGENCY HEAT mode
setting. This indicates that the heat pump is off and the supple-
mental heating appliance is selected for operation.
The word AUX HEAT will be displayed under normal operation
when the second stage of heat is operating.
During the heating season, switch to EMERGENCY HEAT if
the electricity to your outdoor unit is off for more than
30 minutes for any reason (i.e., power outage). Leave the switch
in the EMERGENCY HEAT position for an amount of time
equal to that during which the power was off. It is not nec-
essary to exceed 12 hours. If you cannot determine how long
the power has been off, leave the switch in the EMER-
GENCY HEAT position for 8 hours.
PERFORMING ROUTINE MAINTENANCE
With the proper maintenance and care, your heat pump will
operate economically and dependably. Maintenance can be ac-
complished easily by referring to the following directions. How-
ever, before performing maintenance, consider these impor-
tant safety precautions:
• DISCONNECT ALL ELECTRICAL POWER TO THE HEAT
PUMP BEFORE REMOVING ACCESS PANELS TO PER-
FORM SERVICE OR MAINTENANCE. NOTE: THERE MAY
BE MORE THAN ONE ELECTRICAL DISCONNECT
SWITCH.
• ALTHOUGH SPECIAL CARE HAS BEEN TAKEN TO
MINIMIZE SHARP EDGES IN THE CONSTRUCTION OF
YOUR UNIT, BE EXTREMELY CAREFUL WHEN HAN-
DLING PARTS OR REACHING INTO THE UNIT.
CHECK THE AIR FILTER
A dirty air filter will cause excessive strain on the compres-
sor and blower motor. This can cause the components to over-
heat and automatically shut down. In the extreme, the com-
ponents will fail and need to be replaced. To avoid inefficient
or failed operation of your unit, CHECK THE FILTER(S) EV-
ERY 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 similar, new filters
of the same dimensions.
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• Do not operate your unit in the heating mode when outdoor
temperatures are above 66°F unless you set your thermostat
to emergency heat mode.