Manual
When your heat pump needs additional heat to keep you comlk)rt-
able, your Carrier electronic thermostat will turn on the supple-
mental gas heat and display the "AUX HT" message.
Step 4--Defrost Mode
When your heat pump is providing heat to your home or office and
the outdoor temperature drops below 45°F, moisture may begin to
freeze on the surlitce of the coil. If allowed to build up, this ice
would impede airflow across the coil and reduce the mnount ol'
heat absorbed from the outside air. So, to maintain energy-efficient
operation, your heat pump has an automatic defrost mode.
The del_'ost mode starts at a preset time interval of 30 minutes,
although, it may be reset to 60, 90 or 120 minutes. Defrost will
start at the preset time only il' the ice is sufficient to interlEre with
normal heating operation.
After the ice is melted fronl the coil, or al_er a maximnm ol' 10
minutes in defrost mode, the nnit automatically switches back to
normal heating operation.
Do not be alamled 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 lk_r ice to build up on the unit
grille. This is normal lk_r these weather conditions. Do not attempt
to remove the ice from the unit grille. This condition will not affect
the proper function ol' the nnit and will clear within a few days.
Step 5--Emergency Heat Mode
If you should have problems with the heat pump portion ol' your
system, this mode allows your supplemental gas heating source to
keep your home or office warm until your heat pump can be
serviced.
MAINTENANCE AND SERVICE
This section discusses maintenance that should be performed on
your system. Most maintenance should be perlimned by your
dealer. You, as the owner, may wish to handle some minor
maintenance for your new unit.
ROUTINE MAINTENANCE
All routine maintenance should be handled by skilled, experienced
personneh Your dealer can help you establish a standard proce-
dure.
For your sali.,ty, keep the unit area clear and l)_ee of combustible
materials, gasoline, and other flammable liquids and vapors.
To assure proper functioning of the unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance from the
top ol' the unit is 48 in. Clearance of at least 36 in. is required on
sides except the power entry side (42 in. clearance) and the duct
side (12 in. minimum clearance).
MAINTENANCE AND CARE FOR THE EQUIPMENT
OWNER
Before proceeding with those things you might want to maiutain
yourself, please caretMly consider the lk)llowing:
Ir!_ I,','/'_'_-'t_11_[fl
1. TURN OFF ALL ELECTRICAL POWER TO YOUR
UNIT AND INSTALL LOCK-OUT TAG BEFORE SER-
VICING OR PERFORMING MAINTENANCE. ELEC-
TRIC SHOCK COULD CAUSE SERIOUS INJURY OR
DEATH.
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 keep
sharp edges to a minimum, be extremely careful when
handling parts or reaching into the nnit.
Air Filters
The air filter(s) should be checked at least 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. Table 1 indicates the correct
filter size lbr your unit. Refer to Fig. 2 to access the filters.
Table I--Indoor-Air Filter Data
UNIT SIZE FILTER SIZE
48JZ024-030 20 x 20 x 1
48JZ036 20 x 24 x 1
48JZ042-060 24 x 30 x 1
FILTER ACCESS
PANEL*
ACCESSPANEL
*For accessory filter rack.
C99094
Fig. 2--Filter Access Panel-Vertical Supply Shown
To replace or inspect filters (or accessory filter rack when
supplied):
1. Remove the filter access panel using a 5/16-in. nut driver.
2. Remove the filter(s) by pulling it out ol' the nnit. If the filter(s)
is dirty, clean or rcplace with a new one.
When installing the new filter(s), note the direction of the airflow
arrows on the filter frame.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for
instructions. When rcplacing filters, always use the same size and
type of filter that was supplied, originally, by the installer.