Carrier 50ZP - Manual (Page 3)

Heating Cycle — if you own a packaged air condi­
tioner that includes electric heat as an accessory, you need
only program your thermostat for heating.
With the SYSTEM switch of your indoor thermostat
set to the HEAT position, 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 com­
fortable environment on colder days and nights than on mod­
erate ones.
50 60 70 80
PERFORMING ROUTINE MAINTENANCE
With the proper maintenance and care, your air condi­
tioner will operate economically and dependably. Mainte­
nance can be accomplished easily by referring to the follow­
ing directions. However, before performing maintenance,
consider these important safety precautions:
• DISCONNECT ALL ELECTRICAL POWER TO THE
AIR CONDITIONER BEFORE PERFORMING SER­
VICE OR MAINTENANCE. DO NOT REMOVE AC­
CESS PANELS.
For a packaged air conditioner unit, disconnect power to
the unit and any supplemental electric heaters.
NOTE: THERE MAY BE MORE THAN ONE ELEC­
TRICAL DISCONNECT SWITCH.
• ALTHOUGH SPECIAL CARE HAS BEEN TAKEN TO
MINIMIZE SHARP EDGES IN THE CONSTRUCTION
OF YOUR UNIT, BE EXTREMELY CAREFUL WHEN
HANDLING PARTS. DO NOT REACH INTO THE
UNIT.
Check the Air Filter — a dirty air filter will cause
excessive strain on the compressor and blower motor. This
can cause the components to overheat and automatically shut
down. In the extreme, the components will fail and need to
be replaced. To avoid inefficient or failed operation of your
unit, CHECK THE FILTER(S) EVERY 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 fil­
ters of the same dimensions.
Reusable, permanent filters should be washed in a solu­
tion of cold water and mild detergent, then rinsed and thor­
oughly dried. THE FILTER MUST BE COMPLETELY DRY
BEFORE BEING REINSTALLED. To avoid prolonged shut­
down of your unit while a filter is drying, you should have
an extra filter on hand. This would allow you to rotate be­
tween the two with minimal downtime for your comfort sys­
tem. Extra filters may be purchased from your dealer.
The filter(s) and filter rack for a packaged system are sup­
plied and installed by the contractor or dealer. Typically, the
filter(s) and rack are located in the return-air duct at the out­
door unit or behind the return-air grille(s) Have your dealer
show you the location of your filter(s) and the procedures
for removal and replacement.
If you have any questions about the removal and/or clean­
ing of your filter(s), contact your dealer for assistance.
If grass clippings, leaves, shrubbery, and debris are kept
away from the unit, minimal care should be sufficient to keep
the system functioning properly. However, if the outdoor coil
becomes dirty, use a brush or vacuum cleaner and soft brush
attachment to clean the exterior surface. If dirt is deep in the
coil, contact your dealer for service. The outdoor fan motor
may have to be disconnected and the top panel removed to
gain access to the coil for thorough cleaning Do not attempt
this yourself.
Unit Support — Your packaged unit should be main­
tained at a level position. If its support should shift or settle
so that the unit is no longer level, you should correct the
condition. Relevel it promptly to assure condensate drainage
out of the unit. If you notice that water or ice collects be­
neath the unit, arrange for it to be drained away from the
unit.
BEFORE YOU CALL FOR SERVICE, CHECK FOR
THESE EASILY SOLVED PROBLEMS
Check the indoor and outdoor disconnect switches. Verify
that circuit breakers are ON.
Check for sufficient airflow. Check the air filter(s) for any
accumulations of dirt. Check for blocked return-air or supply-
air grilles. Be sure grilles are open and unobstructed.
Check the settings on your indoor thermostat. If you de­
sire cooling, see that the temperature control selector is set
below room temperature and the SYSTEM switch is on the
COOL or AUTO position. If you require warmth, be sure the
temperature control selector is set above room temperature
and the SYSTEM switch is at HEAT or AUTO. The FAN
switch should be set at ON for continuous blower operation
or AUTO if you wish the blower to function only while the
unit is operating.
If your comfort system still fails to operate, contact your
servicing dealer for troubleshooting and repairs. Specify your
apparent problem, and state the model and serial numbers of
your equipment. (You should have them recorded on page 4
of this booklet.) With this information, your dealer may be
able to offer helpful suggestions over the phone, or save valu­
able time through knowledgeable preparation for the service
call.