Carrier 38YD User Manual

Carrier )

38 YD

TWO-SPEED

A GUIDE TO OPERATING

AND MAINTAINING

YOUR RESIDENTIAL

HEAT PUMP UNIT,

SYNERGY 2000

NOTE TO INSTALLER:

This manual should be left with equipment user.

WELCOME TO EFFICIENT YEAR-ROUND COMFORT

Congratulations on your excellent choice and sound invest
ment in year-round home comfort!

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 manufacturers of comfort
systems.

Your new unit is among the most energy-efficient and reliable
heat pump products available today. To assure its dependabil
ity, spend just a few 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 for
years to come.

A 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 as
sistance. The qualified installer or agency must use fac
tory-authorized kits or accessories when modifying this
product.

A WARNING

To prevent personal injury, death, or property damage, be
fore operating your new heat pump, read and follow all in
structions and warnings, including labels shipped with or
attached to unit.

YOUR COMFORT SYSTEM

Identifying Your System

Thke the time to familiarize yourself with the type of system
you have. This knowledge will be of use in understanding the
basic operation of your new heat pump.

The split-system type has an indoor and an outdoor unit, each
of which contains a coil. These units are interconnected by re
frigerant 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 following 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
found obstructing grilles. 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 upon it. Do not
allow grass clippings, leaves, or other debris to accumulate
around or on top of the unit. Maintain a 12-in. minimum clear
ance between the outdoor unit and tall grass, vines, shrubs, etc.

Fig. 1—Typical Split-System Instaliation

• 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—for instance, switching the electrical supply
power ON and OFF-—may cause damage to the unit.

• Thermostat “jiggling” causes rapid-cycling, which is poten
tially damaging to the compressor. Do not move the tempera
ture selector on the thermostat for any reason for at least 5
minutes after the compressor has shut off.

• During the heating season, never increase the indoor thermo
stat setting more than 1 or 2-degree increments. If larger adjust
ments are made, the supplementary heating source will be
turned on automatically. Needless use of the supplementary
heat reduces potential energy savings.

• You may find that you can maintain greater personal comfort
by running the fan continuously. “Air pockets” 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
operation minimizes any temperature differences. Also, sys
tems equipped with electronic air cleaners and/or humidifiers
offer the added benefits of having the air continuously cleaned
year-round, and humidified during the winter season.

• 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 cooling coil. Check this occasionally to be sure the drain
system is not clogged. Of course, don’t expect to see much drain
age 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 the air is be
ing delivered at a higher velocity and a more constant flow than
air supplied by a conventional furnace. Also, your heat pump
supplies air at 85 to 90°F instead of in sudden bursts of hot air
as with a conventional furnace. The air may feel cool because it
is slightly less than your body temperature. However, it is suffi
ciently warm to keep you comfortable.

• Ice or frost will tend to form 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

A91281

Fig. 2—Auto Changeover

Thermostat

for steam or fog to rise from the outdoor unit. Do not be
alarmed!

• Do not operate your unit in cooling mode when outdoor tem

peratures are below 55 °P.

• Do not operate your unit in heating mode when outdoor tem

peratures are above 66°F.

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 for heat pump systems have 3 controls: the tem
perature control selector, FAN switch, and SYSTEM switch.

The temperature control selector is a dial or lever that allows
you to establish the degree of temperature that you wish to
maintain for your personal comfort. Some thermostats possess

2 temperature control selectors: one for setting the temperature
desired during the cooling cycle, and one to set the heating oper
ation temperature. TVpical settings are 78°F for cooling and

68 °F for heating.

The FAN switch offers 2 options for controlling the blower:
AUTO and ON. When set to AUTO, the blower will run during
the time the heat pump is operating. When the FAN switch is

set at the ON position, the blower will run continuously.
Typically, the SYSTEM switch on your thermostat offers the

following selections: EM HEAT, HEAT, OFF, AUTO, and

COOL. The heat pump will not operate when the SYSTEM

switch is set at the OFF position. With the SYSTEM switch set

at COOL, your heat pump will operate in its cooling mode when
the indoor temperature rises above the level that you wish to

maintain. With the SYSTEM switch set at the HEAT position,

your heat pump will provide warmth whenever the indoor tem

perature falls below the level that you have selected.

The AUTO selection found on some thermostats provides for

automatic changeover between cooling and heating cycles.

With the SYSTEM switch set in the AUTO position, the cool

ing mode is activated when the indoor temperature rises above

the thermostat cooling temperature setting, or the heating

mode will be activated when the indoor temperature drops be

low the thermostat setting for the heating cycle.

Fig. 3—Night Setback

Thermostat

If equipped with and you wish to program your accessory elec
tronic indoor thermostat, please refer to thermostat installa
tion instructions.

Depending on your typical winter heating needs, your home
comfort system may include a supplementary heating source.
When the system switch is set to HEAT, your heat pump will
operate normally and supplementary heat will be added as
needed. With the system switch set to EM HEAT, the heat
pump will turn off and the supplementary heat source will sup
ply all your home heating needs.

NOTE: Your two-speed heat pump system has several special

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. Dur
ing 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 de
mand, it will operate for a minimum of 2 minutes on low speed.

COOLING CYCLE

When operating in the cooling cycle, your heat pump will run
until the indoor temperature is lowered to the level you have se
lected. 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. Your cooling unit will work longer to
keep your home comfortable 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 CYCLE

With the SYSTEM switch of your indoor thermostat set to the

HEAT position, the heating section of your home comfort sys