3
When your heat pump needs additional heat to keep you
comfortable your thermostat will turn on the supplemental
heat (if equipped). When the thermostat calls for
supplemental heat, you may notice the indoor fan increase
its speed.
Defrost Mode
When your unit is providing heat to your home or office and
the outdoor temperature drops below 45
°
F (7.2
°
C), 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 unit has an
automatic defrost mode.
The defrost mode starts at a preset time interval of 60
minutes, although, it may be reset to 30, 90 or 120 minutes.
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 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.
During defrost mode, your heat pump will automatically turn
on the supplemental heat, if equipped. You may notice the
indoor fan increase it’s speed.
Emergency Heating Mode
In the event of primary unit heat failure, the emergency heat
mode allows your supplemental heating source to keep your
home or office warm until your unit can be serviced. Contact
your dealer in the event of primary unit heat failure.
During defrost mode, your heat pump will automatically turn
on the supplemental heat, if equipped. You may notice the
indoor fan increase it’s speed.
MAINTENANCE AND SERVICE
This section discusses maintenance that should be
performed by your dealer and care you, as the owner, may
wish to handle for your new unit,
Routine Maintenance
All routine maintenance should be handled by skilled,
experienced personnel. Your dealer can help you establish
a standard procedure.
To assure proper functioning of the unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance
from the top of the unit is 48 in. (1219 mm). Clearance of at
least 36 in. (914 mm) is required on sides except the power
entry side (42 in. [1067 mm] clearance) and the duct side (12
in. [305 mm] minimum clearance).
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to
maintain yourself, please carefully consider the following:
FIRE, EXPLOSION, ELECTRICAL SHOCK AND CUT
HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE
SERVICING
OR
PERFORMING
MAINTENANCE.
2. When removing access panels or performing
maintenance functions inside your unit, be aware of
sharp sheet metal parts and screws. Although special
care is taken to reduce sharp edges to a minimum, be
extremely careful when handling parts or reaching into
the unit. Wear safety glasses, gloves and appropriate
protective clothing.
!
WARNING
Air Filters
The air filter(s) should be checked every 3 or 4 weeks and
changed or cleaned whenever it becomes dirty. Dirty filters
produce excessive stress on the blower motor and can cause
the motor to overheat and shut down.
This unit must have air filters in place before it can be
operated. These filters can be located in one of at least two
places. In many applications, the installer will provide return
air filter grilles mounted on the wall or ceiling of the
conditioned structure. In the instance of filter grilles, the filters
can simply be removed from the grille and replaced.
Table 1 indicates the correct indoor filter size for your unit.
Table 1—Indoor Air Filter Data
Unit Size
Filter Size
24
20x20x1 (508x508x25 mm)
30
20x24x1 (508x610x25 mm)
36--42
24x30x1 (610x762x25 mm)
48--60
24x36x1 (610x914x25 mm)
If you have difficulty locating your air filter(s) or have
questions concerning proper filter maintenance, contact your
dealer for instructions. When replacing filters, always use the
same size and type of filter that was supplied, originally, by
the installer.
UNIT OPERATION HAZARD
Failure to follow this caution may result in property
damage.
Never operate your unit without filters in place. An
accumulation of dust and lint on internal parts of your unit
can cause loss of efficiency and blower motor and/or
compressor damage.
!
CAUTION
Fans and Fan Motors
Periodically check the condition of fan wheels and housings
and fan--motor shaft bearings. No lubrication of
