Carrier 38YCC060 SERIES300, 38YCC048 SERIES300, 38YCC042 SERIES360, 38YCC042 SERIES300, 38YCC036 SERIES340 Owner’s Manual

SAFETY CONSIDERATIONS

Recognize safety inS\wmation. This is the safety-alert symbol

z_. When you see this symbol on the unit and in instructions

or manuals, be alert to the potential S\_rpersonal injury.
Understand the signal words DANGER, WARNING, and

CAUTION. These words are used with the safety-alert symbol.

DANGER identifies the most serious hazards which will result

in severe personal injury or death. WARNING signifies hazards

which could result in personal injury or death. CAUTION is

used to identify unsafe practices which would result in minor
personal injury or product and property damage. NOTE is used
to highlight suggestions that will result in enhanced installa-
tion, reliability, or operation.

Improper installation, adjustment, alteration, ser-
vice, 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 as-

sistance. The qualified installer or service agency
must use factory-authorized kits or accessories

when modifying this product.

To prevent personal injury, death, or property
damage, read and follow all instructions and warn-

ings, including labels shipped with or attached to
unit before operating your new heat pump.

IMPORTANT FACTS

To better protect your invest ment and to elilninate unnecessary

service calls, familiarize yourself with the S\_llowing facts:

• Each unit has a rating plate affixed to it which provides nec-

essary inS\wmation S\_rspecific identification of a unit. You

should familiarize yourself with the product, model, and serial

numbers listed on each rating plate. Record them S\_rfnture
reference on the last page of this booklet.

• Your heat pump system should never be operated without a
clean air filter properly installed. Plan to inspect the filter peri-
odically. 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
S\mnd obstructing registers. Restricted airflow lessens the
unit's efficiency and life span.

• The outdoor unit must have unrestricted airflow. Do not
cover the unit, lean anything against it, or stand on it. Do not

allow 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 heat pump system. You should familiarize yourself
with its proper operation. Attempting to control the system by
other means--S\_r instance, switching the electrical supply
power ON and OFF--may cause damage to the unit.

• During heating, increasing the thermostat setting more than
2 degrees may cause the supplemental heaters to be turned on
to satisfy the thermostat. Needless use of the supplementary
heat reduces potential energy savings.

• You may find that you can maintain greater personal com-
S\_rtby running the fan continuously. "Air pockets" can S\_rm
due to the structure of the house, placement of registers, etc.
These air pockets may be too cool or warm l\_r your liking.
Continuous fan operation minimizes any temperature differ-
ences. Also, systems equipped with electronic or mechanical

air cleaners and/or humidifiers offer the added benefits of hav-
ing the air continuously cleaned yea>round and humidified

during the winter season.

• A system equipped with a heat or energy recovery ventilator
offers the advantage of exhausting stale air Srom the home and
allowing fresh air in from the outdoors while minimizing heat

loss.

• Your system may also be equipped with a zoning system
which allows individual control over the temperatures of sep-
arate areas of your home.

• Your heat pump will remove humidity fiom your home dur-
ing the cooling season. ASter a few minutes of operation, you

should be able to see water trickle from the condensate drain
of the indoor 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.

NOTE TO INSTALLER: THIS MANUAL SHOULD BE LEFT WITH THE EQUIPMENT USER.

• During the heating cycle, air from your registers may seem
cooler than you might first expect. This is because your heat
pump delivers a constant flow of air at around 90°F to 105°F

instead of in sudden bursts of hot air as with a conventional
furnace. This air may feel cool because it is slightly less than

your skin temperature. However, it is sufficiently warm to
keep you coml\wtable.

• Ice or frost will tend to form on the outdoor coil during the win-
ter heating operation. Your heat pump is designed to automatical-
ly melt the ice. When in this defrost cycle, it is normal for steam
or I\_gto rise from the outdoor unit. Do not be alarmed?

• Do not operate your unit in cooling mode when outdoor
temperatures are below 55°F unless your unit was modified
l\_rlow-ambient operation.

• Do not operate your unit in heating mode when outdoor
temperatures are above 66°F unless you set your thermostat
to emergency heat mode.

OPERATING YOUR HEAT PUMP

The operation of your heat pump system is controlled by the
indoor thermostat. You simply adjust the thermostat and it
maintains the indoor temperature at the level you select. Most
thermostats l\w heat pump systems have three controls: a tem-
perature control selector, a FAN control, and a SYSTEM or

MODE control.

The FAN control offel.Stwo options for controlling the indoor

blower: AUTO and ON. When set to AUTO, the blower l-unsonly

when the heat pump is operating. When set to ON, the Nower l'uns
continuously.

Typically, the SYSTEM or MODE control on your thermostat
offers the l\_llowing selections: COOL, OFE HEAT, AUTO,
and EMERGENCY HEAT. Some thermostats may have a sep-
arate switch t\_rEMERGENCY HEAT. The heat pump will not
operate when the SYSTEM OR MODE control is set to OFF.

With the SYSTEM or MODE control set to COOL, your heat

pump will provide cooling when the indoor temperature rises
above the level you wish to maintain. With the SYSTEM or
MODE control set to HEAT. your heat pump will provide
warmth whenever the indoor temperature falls below the level
that you have selected.

The AUTO selection t\mnd on some thermostats provides l\_r
automatic changeover between cooling and heating. With the
SYSTEM or MODE control set toAUTO, cooling operation is
activated when the indoor temperature rises above the thermo-
stat cooling temperature setting, or heating operation is acti-
vated when the indoor temperature drops below the thermostat
heating setting.

Depending on your typical winter heating needs, your home
comt\wt system may include a supplementary heating source.
The EMERGENCY HEAT setting (EHEAT) provides l\_rcon-
venient selection between the two heating appliances. Your
heat pump will operate when the SYSTEM or MODE control

is set to HEAT. With the SYSTEM or MODE control set to
EHEAT. the heat pump will turn off and the supplementary

heat source will be activated.
In certain geographic areas and in certain applications, supple-

mental heat is not required. Any questions regarding your
application should be directed to your dealel;

COOLING MODE

When operating in cooling mode, yonr heat pump will run in

cooling mode until the indoor temperature is lowered to the

level you have selected. On extremely hot days, your heat
pump will run for longer periods at a time and have shorter
"oW' periods than on moderate days.

The t\_llowing are typical conditions that add extra heat and/or
humidity to your home. Your heat pump will work longer to
keep your home coml\wtable under these conditions:

• 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 MODE

With the SYSTEM or MODE control of your indoor thermo-

stat set to HEAT, your heat pump will run in heating mode until

room temperature is raised to the level you have selected. Of
course, your heat pump will have to operate l\_r longer periods
to maintain a comt\mable environment on cooler days and
nights than on moderate ones.

SUPPLEMENTAL HEAT

Your heat pump is your prili'lary heating source. Y_our system
may also be equipped with a supplemental heating source such
as electric, gas, or oil. On cold days and nights, your system
will automatically turn on the supplemental heat in order to
maintain the level of coml\_rt you have selected.

DEFROST MODE

When your heat pump is providing heat to your home and the
outdoor temperature drops below 45°F, moisture may begin to
freeze on the surface of the outdoor coil. If allowed to build up,
this ice would impede airflow across the coil and reduce the
amount of heat absorbed from the outside all: So, to maintain
energy-efficient operation, your heat pump has an automatic

defrost mode.

The defrost mode starts at a preset time interval of 90 minutes,
although, it may be reset to either 30 or 50 minutes. Defrost
will start at the preset time only if the ice is sufficient to inter-
fere with normal heating operation.

After the ice is melted from the outdoor coil, or after a maxi-
mum of 10 minutes in defrost mode, the unit automatically
switches back to normal heating operation.

Do not be alarmed 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 all:

During certain weather conditions such as heavy snow and
freezing rain it is not uncommon l\_r ice to build up on the
outdoor unit grille. This is normal for these weather conditions.
Do not attempt to remove the ice from the outdoor unit grille.
This condition will not affect the proper function of the unit
and will clear within a few days.

EMERGENCY HEAT MODE

The emergency heat (EHEAT) setting on your Carrier electron-
ic thermostat can be used to turn off your heat pump and use
only the supplemental heating source (if equipped). The Aux-
iliary Heat Indicator (AUX HT) will be displayed while your
system is operating in EHEAT mode.

Emergency heat is not normally used. There may be situations,