Carrier 38TDA Operating And Maintaining
®
NOTE TO INSTALLER: THIS MANUAL SHOULD BE LEFT WITH THE EQUIPMENT USER.
WELCOME TO EFFICIENT
HOME COOLING COMFORT
Congratulations on your excellent choice and sound in vestment
in home cooling comfort!
Y our ne w air conditioning unit represents both the latest in engineering development and the culmination of many years of
experience from one of the most reputable manufacturers of
comfort systems.
Your new unit is among the most energy-efficient and reliable
air conditioning products av ailable today. To assure its dependability , spend a fe w minutes with this booklet no w. Learn about
the operation of your air conditioner , and the small amount of
maintenance it takes to keep it operating at peak efficiency.
With minimal care, your ne w air conditioner will provide you and
your family with cool comfort—both now and for years to come.
SAFETY CONSIDERATION
Recognize safety information. This is the safety-alert symbol .
When you see this symbol on the unit or in instructions and manuals, be alert to the potential for personal injury.
Understand the signal word DANGER, WARNING, or CAUTION. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which
in severe personal injury or death. WARNING signifies hazards that
is used to identify unsafe practices which
personal injury or product and property damage.
could result in personal injury or death. CAUTION
would result in minor
!
WARNING
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion,
fire, electrical shock, or other conditions which
may cause personal injury or property damage.
Consult a qualified installer, service agency, or
your distributor or branch for information or assistance. The qualified installer or agency must
use factory-authorized kits or accessories when
modifying this product.
will result
!
Fig. 1—Typical Split-System Installation
!
WARNING
To prevent personal injury, death, or property
damage, read and follow all instructions and warnings, including labels shipped with or attached to
the unit before operating your new air conditioner.
YOUR COMFORT SYSTEM
Identifying Y our System
T ake the time to familiarize yourself with the type of system you
have. This knowledge will be useful in understanding the basic
operation of your new air conditioner.
The split-system type has an indoor and an outdoor unit, each of
which contains a coil. These units are interconnected by refrigerant tubes, as shown in Fig. 1.
Each unit has a rating plate affixed to it. A rating plate
provides necessary information for specific identification of a unit. You should familiarize yourself with the
product, model, and serial numbers listed on each rating plate.
IMPORTANT FACTS
To better protect your investment and to eliminate unnecessary
service calls, familiarize yourself with the follo wing facts:
• Y our air conditioning system should ne ver be operated without
a properly installed clean air filter . Plan to inspect the fi lter periodically . A clogged air filter will increase operating costs and
shorten the life of the unit.
• Supply-air and return-air registers should not be blocked.
Drapes, furniture, and toys are some of the items commonly
found obstructing grilles. Restricted airflow lessens the unit’ s ef ficiency and shortens its life span.
• The outdoor unit must have unrestricted airfl o w. Do not cov er
the unit, lean anything against it, or stand on it. Do not allo w grass
clippings, leaves, or other debris to accumulate around or on top
of the unit. Maintain a 12-in. minimum clearance between the
outdoor unit and tall grass, vines, shrubs, etc.
• Your multipurpose indoor thermostat is the control center
for your air conditioning system. You should familiarize
yourself with its proper operation. Attempting to control
the system by other means—for instance, switching the
electrical supply power on and of f—may cause damage to the
unit.
• You may find that you can maintain greater personal comfort
by running the fan continuously. Air pock ets can form due to the
structure of the house, placement of registers, etc. These air pockets may be too cool or warm for your liking. Continuous fan oper ation minimizes any temperature dif ferences. Also, systems
equipped with electronic air cleaners and/or humidifiers of fer the
added benefits of having the air continuously cleaned year -round,
and humidified during the winter season.
• Your air conditioner will remov e humidity from your home
during the cooling season. After a fe w 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. Do not expect to see much drainage if you li ve
in a very dry en vironment.
• Do not operate your unit when outdoor temperature is belo w
55°F .
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LCD READOUT DISPLAYS
CURRENT ROOM TEMPERATURE,
DESIRED ROOM TEMPERATURE,
UNIT MODE SETTING,
AND FAN MODE SETTING
PROGRAM BUTTONS
FOR PROGRAMMING
HEATING/COOLING
CYCLES
MODE BUTTON SELECTS
BETWEEN OFF, HEAT,
COOL, AND AUTO
OPERATION
LCD READOUT DISPLAYS
CURRENT ROOM TEMPERATURE,
DESIRED ROOM TEMPERATURE
OR OUTDOOR TEMPERATURE,
UNIT MODE SETTING,
FAN MODE SETTING,
AND TIME OF DAY
Thermostat
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—Typical Non-Programmable
Thermostat
OPERATING YOUR AIR CONDITIONER
The operation of your air conditioning system is controlled by
the indoor thermostat. Simply adjust the thermostat to maintain
the indoor temperature at the lev el you select. Most thermostats
have three controls: the temperature, FAN, and mode selectors.
The temperature selector could be a dial, lever, or buttons that
allow you to establish the degree of temperature that you wish
to maintain for your personal comfort. Some thermostats possess two temperature control selectors: one for setting the temperature desired during the cooling cycle, and one to set the
heating operation temperature.
The FAN button offers two options for controlling the blower;
AUTO and ON. When set to AUTO, the blower will run only
while the thermostat operates the cooling or heating section.
When the FAN is set to the ON position, the blower will run
continuously—regardless of whether the cooling or heating section is operating.
T ypically , the MODE button on your thermostat of fers the following selections; COOL, OFF , and HEA T . Y our thermostat may also
have a fourth selection, A UT O. Neither the cooling nor heating
section will operate when the MODE is set to the OFF position.
With the MODE set to COOL, the cooling section of your comfort
system will operate when the indoor temperature rises abov e the
level that you wish to maintain. W ith the MODE set to HEAT, the
heating section will operate automatically when the indoor temperature falls below the le v el that you have selected.
The AUTO selection found on some thermostats pro vides for automatic changeover between cooling and heating c ycles. With the
MODE set to AUTO, the cooling section will operate when the
indoor temperature rises above the thermostat cooling temperature
setting, or the heating section will operate when the indoor temper ature drops below the thermostat setting for the heating c ycle.
NOTE:
features built in to protect the unit.
• 5-MINUTE TIME DELAY—Unit will delay operation upon
initial start-up or short cycling of the indoor thermostat.
• 1-MINUTE TIME DELAY—When changing speeds from
low to high, or high to low, there is a 1-minute time delay. During the speed change delay, the outdoor fan will continue to run.
• 2-MINUTE LOW-SPEED MINIMUM—If the unit has not
operated within the past 30 minutes, upon the next cooling
demand it will operate for a minimum of 2 minutes on low speed.
If you wish to program your accessory electronic indoor thermostat, refer to thermostat Installation Instructions.
Y our 2-speed air conditioning system has se veral special
UP AND DOWN
BUTTONS INCREASE
OR DECREASE THE
DESIRED TEMPERATURE
SETTINGS
Programmable
Thermostat
MODE
PROGRAM
COPY PREVIOUS DAY
CHANGE DAY
SET TIME/TEMP
SET TIME
BUTTON
RESET FILTER BUTTON
RESTARTS THE TIMER
THAT CALCULATES
THE NEXT AIR FILTER
CHANGE OR CLEANING
FAN
END
HOLDRESET FILTER
HOLDRESET FILTER
FAN BUTTON CHOOSES
BETWEEN ON OR AUTO
FAN OPERATION
HOLD BUTTON MAINTAINS
THE CURRENT TEMPERATURE
AND OVERRIDES PROGRAMMED
TEMPERATURE CHANGES
UNTIL RESET
UP AND DOWN
BUTTONS INCREASE
OR DECREASE THE
DESIRED TEMPERATURE
SETTINGS
Fig. 3—Typical Programmable Thermostat
COOLING CYCLE
When operating in the cooling cycle, your air conditioner will
run until the indoor temperature is lowered to the le vel you ha ve
selected. On extremely hot days, your air conditioner will run
for longer periods at a time and have shorter “off” periods than
on moderate days.
The following conditions typically add e xtra heat and/or humidity to your home and make your cooling unit work longer to k eep
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
HEATING CYCLE
With the MODE of your indoor thermostat set to HEAT, the
heating section of your home comfort system will operate until
room temperature is raised to the lev el you have selected. 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 furnace User’s Manual for specific information on
heating operation.
PERFORMING ROUTINE MAINTENANCE
With proper maintenance and care, your air conditioning unit
will operate economically and dependably . Maintenance can be
accomplished easily by referring to the following directions.
Howev e r, before performing maintenance, consider these
important safety precautions
!
WARNING
To prevent personal injury or death disconnect all
electrical power to the air conditioner before removing access panels to perform maintenance.
Disconnect power to both the indoor and outdoor
units. Note: there may be more than 1 electrical
disconnect switch.
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