Carrier 38CKC048 User Manual

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.  
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. Extraltersmaybepurchasedfromyour  
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.  
5
• 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.  
6
7
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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