CENTRAL AIR CONDITIONER
A GUIDE TO OPERATING AND MAINTAININGYOUR RESIDENTIAL AIR CONDITIONING UNIT.
NOTE TO INSTALLER:THIS MANUAL SHOULD BE LEFT WITH THE EQUIPMENT USER.
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LCD READOUT DISPLAYS
CURRENT ROOM TEMPERATURE,
DESIRED ROOM TEMPERATURE,
UNIT MODE SETTING,
AND FAN MODE SETTING
Thermostat
UP AND DOWN
BUTTONS INCREASE
OR DECREASE THE
DESIRED TEMPERATURE
SETTINGS
RESET/FILTER
FAN
MODE
MODE BUTTON SELECTS
BETWEEN OFF, HEAT,
COOL, AND AUTO OPERATION
RESET FILTER BUTTON
RESTARTS THE TIMER
THAT CALCULATES
THE NEXT AIR FILTER
CHANGE OR CLEANING
FAN BUTTON CHOOSES
BETWEEN ON OR AUTO
FAN OPERATION
Fig. 2—Carrier Non-ProgrammableThermostat
thermostats have three controls: a temperature control selector,
a FAN control, and a SYSTEM or MODE control.
• Your system may also be equipped with a zoning system which
allows individual control over the temperatures of separate areas
of your home.
The temperature control selector can be a dial, lever, or set of
buttons that allows you to establish the degree of temperature
you wish to maintain for your personal comfort. Some thermo-
stats possess two temperature control selectors: one for setting
the temperature desired for cooling operation, and one for set-
ting the temperature desired for heating operation.
• Your air conditioner removes humidity from your home during
the cooling season. After a few minutes of operation, you should
be able to see water trickle from the condensate drain of the
cooling coil. Check this occasionally to be sure the drain system
is not clogged. Of course, don’t expect to see much drainage if
you live in a very dry environment.
The FAN control offers two options for controlling the indoor
blower: AUTO and ON. When set to AUTO, the blower runs
only while the thermostat operates the cooling or heating equip-
ment. When set to ON, the blower runs continuously—regard-
less of whether the cooling or heating equipment is operating.
• Do not operate your unit when outdoor temperatures are below
55°F.
OPERATINGYOUR AIR CONDITIONER
The operation of your air conditioning system is controlled by
the indoor thermostat.You simply adjust the thermostat and it
maintains the indoor temperature at the level you select. Most
Typically, the SYSTEM or MODE control on your thermostat
offers the following selections: COOL, OFF, and HEAT. Your
thermostat may also have a fourth selection,AUTO. Neither the
cooling nor heating equipment will operate when the SYSTEM
LCD READOUT DISPLAYS
MODE BUTTON SELECTS
CURRENT ROOM TEMPERATURE,
DESIRED ROOM TEMPERATURE
OR OUTDOOR TEMPERATURE,
UNIT MODE SETTING,
BETWEEN OFF, HEAT,
PROGRAM BUTTONS
FOR PROGRAMMING
HEATING/COOLING
CYCLES
COOL, AND AUTO
OPERATION
FAN MODE SETTING,
AND TIME OF DAY
Programmable
Thermostat
MODE
FAN
COPY PREVIOUS DAY
CHANGE DAY
PROGRAM
END
UP AND DOWN
BUTTONS INCREASE
OR DECREASE THE
DESIRED TEMPERATURE
SETTINGS
RT ILR
SET TIME/TEMP RESET FILTER
HD
HOLD
FAN BUTTON CHOOSES
BETWEEN ON OR AUTO
FAN OPERATION
SET TIME
BUTTON
HOLD BUTTON MAINTAINS
THE CURRENT TEMPERATURE
AND OVERRIDES PROGRAMMED
TEMPERATURE CHANGES
UNTIL RESET
RESET FILTER BUTTON
RESTARTS THE TIMER
THAT CALCULATES
THE NEXT AIR FILTER
CHANGE OR CLEANING
Fig. 3—Carrier Programmable Thermostat
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HEATING MODE
With the SYSTEM or MODE control of your indoor thermostat
set to HEAT, the heating unit of your home comfort system oper-
ates until room temperature is raised to the level you have select-
ed. 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.
Refer to your heating unit User’s Manual for specific informa-
tion on heating operation.
PERFORMING ROUTINE
MAINTENANCE
Withthepropermaintenanceandcare, yourairconditioningunit
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. 4—Main Electrical Disconnect
or MODE control is set to OFF. With the SYSTEM or MODE
control set to COOL, your air conditioner will operate when the
indoor temperature rises above the level that you wish to main-
tain.With the SYSTEM or MODE control set to HEAT, the heat-
ing unit of your home comfort system will operate automatically
when indoor temperature falls below the level that you have
selected.
!
WARNING
To prevent personal injury or death disconnect
all electrical power to the indoor air handler or
furnace before removing access panels or per-
forming any maintenance. Disconnect power to
both the indoor and outdoor units. NOTE: There
may be more than 1 electrical disconnect switch.
The AUTO selection found on some thermostats provides for
automatic changeover between cooling and heating equipment
operation. With the SYSTEM or MODE control set to AUTO,
your air conditioner will operate when the indoor temperature
rises above the thermostat cooling temperature setting, or the
heating section will operate when the indoor temperature drops
below the thermostat setting for the heating cycle.
!
CAUTION
Your thermostat may be PROGRAMMABLE or NON-PRO-
GRAMMABLE. A NON-PROGRAMMABLE thermostat
does not allow the temperature settings to be varied throughout
the day or week without physically changing the settings. A
PROGRAMMABLE thermostat allows various daily tempera-
ture changes to be preset. During the winter, for example, you
may wish to set back the temperature of your home at night, then
have the temperature return to normal prior to waking up. The
home’s temperature can then be lowered again during the day
when no one is at home, but again be at peak comfort level when
your family returns home. During the summer, the opposite
changes might be programmed. When properly used, the pro-
gramming can result in energy savings on your home’s heating
and cooling.
Although special care has been taken to minimize
sharp edges in the construction of your unit, be
extremely careful when handling parts or reach-
ing 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 worst case, these compo-
nents will fail and need to be replaced. To avoid inefficient or
COOLING MODE
When operating in cooling mode, your air conditioner runs until the
indoor temperature is lowered to the level you have selected. On
extremely hot days, your conditioner will run for longer periods at
a 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.
Fig. 5—Removing Filter from Fan Coil Unit
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failed operation of your unit, CHECKTHE FILTER(S) EVERY
3 TO 4 WEEKS. Replace filter(s) when necessary, or clean the
filter(s) if you have the reusable type.
approximatelyevery3months, youwillbeaddingadditionallife
to your unit. Consult your installing contractor for proper inter-
vals/procedures for your geographic area or service contact.
Disposable filters should be replaced by similar, new filters of
the same dimensions.
UNIT SUPPORT
Your split-system outdoor unit should be maintained in 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 prompt-
ly to assure that water drains out of the unit. If you notice that
water or ice collects beneath the unit, arrange for it to be drained
away from the unit.
Reusable, permanent filters should be washed in a solution of cold
water and mild detergent, then rinsed and thoroughly dried. THE
FILTER MUST BE COMPLETELY DRY BEFORE BEING
REINSTALLED. To avoid prolonged shutdown of your unit
while a filter is drying, you should have an extra filter on hand.
This allows you to rotate between the two with minimal downtime
foryourcomfortsystem. Extrafiltersmaybepurchasedfromyour
dealer.
BEFOREYOU REQUEST A
SERVICE CALL
There are no filters in the outdoor unit of a split-system. If your
indoor unit is a gas or oil furnace, refer to your furnace User’s
Manual for filter location and procedures for replacement or
cleaning.
CHECK FOR THESE EASILY SOLVED
PROBLEMS:
If your system includes an indoor fan coil unit, the filter may be
located in the unit where it connects with the return-air duct or
plenum. (See Fig. 5.) Remove the filter cover plate by sliding
latches toward center of plate. Lift filter to clear lower flange.
Filter is spring-loaded and will pop out. Reinstall filter, being
certain to secure filter behind lower flange. When reinstalling
cover plate, secure plate behind upper flange then slide tabs out-
ward.
• Check the indoor and outdoor disconnect switches.Verify that
circuit breakers are ON or that fuses have not blown.
• Check for sufficient airflow. Check the air filter(s) for any accu-
mulations of dirt. Check for blocked return-air or supply-air reg-
isters. Be sure registers are open and unobstructed.
• Check the settings on your indoor thermostat. If you desire
cooling, make sure that the temperature control selector is set
below room temperature and the SYSTEM or MODE control is
set to COOL orAUTO. If you require warmth, make sure that the
temperature control selector is set above room temperature and
the SYSTEM or MODE control is set to HEAT or AUTO. The
FAN control should be set to ON for continuous blower operation
orAUTO if you wish blower to function only while the heating or
cooling equipment is operating.
The indoor fan coil unit may be located in the attic. In this
instance the filter could be located behind the return air grille.
Access the filter by removing two screws from return air grille.
If your system includes an electronic air cleaner, refer to air
cleaner user’s manual for proper filter cleaning or replacement.
INDOOR COIL
If the split-system coil has only been operated with a clean filter
in place, it should require minimal cleaning.
If your comfort system still fails to operate, turn your system off
and 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 the last page of this booklet.)With this information,
your dealer may be able to offer helpful suggestions over the
phone or save valuable time through knowledgeable preparation
for the service call.
If coil cleaning is required, call your dealer for service. It may
be necessary to clean the coil with a detergent solution and rinse
it with water. This could require the removal of the coil. You
should not attempt this yourself.
OUTDOOR COIL
If grass clippings, leaves, shrubbery, and debris are kept away
from the outdoor unit, minimal care should be sufficient to keep
the system functioning properly. For proper drainage, debris
must be removed periodically from the base pan. However, if the
outdoor coil becomes dirty, use a vacuum cleaner with soft brush
attachment to clean the exterior surface. Vacuum coil surface
using an up and down motion. Be careful not to bend or damage
coil fins.
REGULAR DEALER MAINTENANCE
In addition to the routine maintenance
that you perform, your home comfort
system should be inspected regularly
by a properly trained service techni-
cian. The inspection (preferably each
year, but at least every other year)
should include the following:
If dirt is deep in the coil, contact your dealer for service. The
outdoorfanmotormayhavetobedisconnectedandthetoppanel
removed to gain access to the coil for thorough cleaning. Do not
attempt this yourself.
• Routine inspection of air filter(s). Replacement or cleaning as
required.
• Inspection and cleaning of the blower wheel, housing, and
motor.
OUTDOOR COIL—SEA COAST
• Inspection and, if required, cleaning of indoor and outdoor
coils.
If your unit is located near the ocean, special maintenance is
required. Ocean mist/breeze carries salt, which is corrosive to
most metals. Although your new unit is made out of galvanized
metal and is protected by top-grade paint, you should take the
precaution of additional maintenance which consists of period-
ically washing the unit. By washing all exposed surfaces and coil
• Inspection of the indoor coil drain pan, plus the primary and
secondary drain lines. If supplied, the auxiliary drain pan and line
should be inspected at this time. Service should include cleaning
if required.
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• A check of all electrical wiring and connections.
FOR THE RECORD
Record the model, product, and serial numbers of your new
equipment in the spaces provided on the last page. This infor-
mation, along with the other ready-reference facts requested,
will be necessary should you ever require information or service.
• A check for secure physical connections of individual compo-
nents within units.
• Operational check of the air conditioning system to determine
actual working condition. Necessary repair and/or adjustment
should be performed at this time.
Your servicing dealer may offer an economical service contract
that covers seasonal inspections. Ask for further details.
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INSTALLATION DATA
Date Installed
MODULAR INDOOR UNIT, if Applicable:
Blower—Product No.
Model No.
Dealer Name
Address
City
Serial No.
State
Zip
Coil—Product No.
Model No.
Telephone
SPLIT-SYSTEM
Serial No.
OUTDOOR UNIT:
Product No.
Model No.
Heater—Product No.
Model No.
Serial No.
Serial No.
ACCESSORIES
INDOOR UNIT OR COIL:
Product No.
Product No.
Product No.
Product No.
Product No.
Product No.
Model No.
Serial No.
HEATING & COOLING
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the
“Heating Equipment’’ or “Air Conditioning Contractors & Systems’’ heading for dealer listing by brand name.
Have available the Model No., Series Letter, & Serial No. of your equipment to ensure correct replacement part.
Carrier Corporation Indianapolis, IN 46231
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Copyright 1998 Carrier Corporation
Form: OM38-45
Replaces: OM38-39
Printed in the U.S.A.
0399 11-98
PC 101
Catalog No. 563-757
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