Carrier 38YDB024 SERIES300, 38YDB036 SERIES300, 38YXA030 SERIES300, 38YXA036 SERIES300, 38YZA024 SERIES310 Owner’s Manual

Puron

the envi_nmentally sound _frigerant

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

WELCOME TO EFFICIENT
YEAR-ROUND COMFORT

Congratulations on your excellent choice and sound invest-
ment in year-round home coml\_rt !

Your new heat pump represents both the latest in engineering
development and the culmination of many years of experience
from one of the most reputable manuthcturers of comt\_rt
systems. Your unit utilizes Carrier's environmentally sound
Puron® refrigerant.

Your new unit is among the most energy-efficient and reliable
heat pump products available today. To assure its dependabil-
ity, spend just afew minutes with this booklet now. Learn about
the operation of your heat pump, and the small amount of
maintenance it takes to keep it operating at its peak efficiency.

With minimal care, your new heat pump will provide you and
your family with year-round home comfort--both now and
l\)r years to come.

SAFETY CONSIDERATIONS

Recognize safety int\_rmation. 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 l\_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 woMd result in minor
personal injury or product and property damage. NOTE is used
to highlight suggestions that will result in enhanced installation,
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.

Fig. 1--Typical Split-System Installation

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.

YOUR COMFORT SYSTEM

Identifying Your System

Take the time to familiarize yonrself with the type of system
you have. This knowledge will be of use in understanding the

basic operation of your new heat pump.

The type of heat pump you have purchased is a split system.
The split-system type has an indoor and an outdoor unit, each
of which contains a coil. These units are interconnected by
refrigerant tubes. (See Fig. 1.)

Each unit has a rating plate affixed to it which provides neces-
sary int\_rmation l\)r specific identification of a unit.You should
familiarize yourself with the product, model, and serial num-

bers listed on each rating plate. Record them t\_rfuture refer-

ence on the last page of this booklet.

IMPORTANT FACTS

To better protect your investment and to eliminate unnecessary
service calls, familiarize yourself with the l\_llowing facts:

• 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
l\mnd obstructing registers. Restricted airflow lessens the
unit's efficiency and life span.

• The outdoor unit must have unrestricted airflow. Do not cov-
erthe 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. (See Fig. 2 and 3.) Attempting to
control the system by other means--t\_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-
l\m by running the fan continuously. Air pockets can t\_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. Continu-
ous fan operation minimizes any temperature differences.
Also, systems equipped with electronic or mechanical air
cleaners and/or humidifiers offer the added benefits of having
the air continuously cleaned year-round and humidified during

the winter season.

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

LCD READOUT DISPLAYS---_

CURRENT ROOM TEMPERATURE, \

DESIRED ROOM TEMPERATURE, \

I----- i i UPAND DOWN

UNIT MODE SETTING,_

AND FAN MODE SETTING X

IFJ i i - BUTTONS NDREASE

I i_j i i I[(_ _lr/ OR DECREASE THE
r!_ ::_ _ ,/_ I f'm,, I SETTINGS

i BES,REDTEMPERATURE

_-" MODE BUTTON SELECTS

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. 2wTypical Carrier Non-Programmable Thermostat

• 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 from your home dur-
ing the cooling season. After 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.

• 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

MODE BUTTON SELECTS

PROGRAM

FOR PROGRAMMING

HEATING/COOLING

CYCLES

BETWEEN OFF, HEAT,

COOL, AUTO, AND

EMERGENCY HEAT

OPERATION

BETWEEN OFF, HEAT,
COOL, AUTO, AND EMERGENCY

HEAT OPERATION

your skin temperature. However. it is sufficiently warm to
keep you comt\_rtable.

• Ice or frost will tend to f_rm on the outdoor coil during the
winter heating operation. Your heat pump is designed to auto-
matically melt the ice. When in this defrost cycle, it is normal
l\_rsteam or l\_g to 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\_r low-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.

CURRENT ROOM TEMPERATURE,

DESIRED ROOM TEMPERATURE

OR OUTDOOR TEMPERATURE,

UNIT MODE SETTING,
FAN MODE SETTING,

AND TIME OF DAY

DISPLAYS

-- UP AND DOWN
BUTTONS INCREASE

OR DECREASE THE
DESIRED TEMPERATURE
SETTINGS

FAN BUTTON CHOOSES

BUTTON

RESET FILTER BUTTON

RESTARTS THE TIMER

THAT CALCULATES

THE NEXT AIR FILTER

CHANGE OR CLEANING

BETWEEN ON OR AUTO
FAN OPERATION

HOLD BUTTON MAINTAINS
THECURRENTTEMPERATURE

AND OVERRIDES PROGRAMMED
TEMPERATURE CHANGES
UNTIL RESET

Fig. 3--Typical Carrier Programmable Thermostat