Identifying Your System; Important Facts; Operating Your Heat Pump - Carrier 50JS Manual To Operating And Maintaining

WARNING
!
To prevent serious injury, death, or property dam-
age, read and follow all instructions and warnings,
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 yourself with your packaged heat
pump system. This knowledge will be of use in understanding
the basic operation of your new heat pump.
The unit has a rating plate affixed to it which provides neces-
sary information for specific identification of a unit. You should
familiarize yourself with the product, model, and serial num-
bers listed on each rating plate. Record them for future 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 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 registers. Restricted airflow lessens the
unit's efficiency and life span.
• The outdoor unit must have unrestricted airflow. Do not cov-
er 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—for instance, switching the electrical supply
power ON and OFF—may cause damage to the unit. (See
Fig. 3.)
• During heating, increasing the thermostat setting more than
2º may cause the supplemental heaters to be turned on for a
short period of time to satisfy the thermostat. Needless use of
the supplementary heat reduces potential energy savings.
• You may find that you can maintain greater personal com-
fort by running the fan continuously. "Air pockets" can form
due to the structure of your home or office, placement of reg-
isters, etc. These air pockets may be too cool or warm for your
liking. Continuous 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 energy recovery ventilator
offers the advantage of exhausting stale air from your home or
office and allowing fresh air in from the outdoors while mini-
mizing heat loss.
• Your system may also be equipped with a zoning system
TOP COVER
Fig. 2—Typical Installation
which allows individual control over the temperatures of sep-
arate areas of your home or office.
• Your heat pump will remove humidity from your home or
office during the cooling season. After a few minutes of oper-
ation, you should be able to see water trickle from the conden-
sate drain. 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 sudden bursts of hot air as with a conventional fur-
nace. This air may feel cool because it is slightly cooler than
your skin temperature. However, it is sufficiently warm to
keep you comfortable.
• Ice or frost will tend to form on the coil during the winter heat-
ing operation. Your heat pump is designed to automatically melt
the ice. When in this defrost cycle, it is normal for steam or fog to
rise from the outdoor unit. Do not be alarmed!
• Do not operate your unit in the cooling mode when outdoor
temperatures are below 55°F unless your unit was modified
for low-ambient operation.
• Do not operate your unit in the 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 for heat pump systems have 3 controls: a temper-
ature control selector, a FAN control, and a SYSTEM or
MODE control. Refer to your T-stat owner's manual for more
information.
Fig. 3—Carrier Non-Programmable T-stat
2
INDOOR
THERMOSTAT
RETURN
AIR
FROM
POWER
SOURCE
DISCONNECT
PER NEC