for specific identification of a unit. You should familiarize yourself
with the product, model, and serial numbers listed on each rating
plate. Record them for future reference in the space provided at the
end of this booklet.
IMPORTANT FACTS
To better protect your investment and to eliminate unnecessary
calls, familiarize yourself with the following facts:
1. Your heat pump system should never be operated without a
clean air filter properly installed. Plan to inspect the filter
periodically. A clogged air filter will increase operating costs
and shorten the life of the unit.
2. 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.
3. 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
on top of the unit. Maintain a 30-in. minimum clearance
between the outdoor unit and tall grass, vines, shrubs, etc.
4. 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).
5. During heating, increasing the thermostat setting more than 2
degrees 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 sav-
ings.
6. 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. 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.
7. Your heat pump will remove 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.
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.
8. 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
furnace. This air may feel cooler because it is slightly less than
your skin temperature. However, it is sufficiently warm to
keep you comfortable.
9. Ice or frost will tend to form on the coil during the winter
heating operation. Your heat pump is designed to automati-
cally 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!
10. Do not operate your unit in cooling mode when outdoor
temperatures are below 55˚F unless your unit was modified for
low-ambient operation.
11. Do not operate your unit in heating mode when outdoor
temperatures are above 66˚F unless you set your thermostat to
emergency heat mode.
FIRE AND ELECTRICAL HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
To prevent serious injury, death, or property damage, read
and follow all instructions and warnings, including labels
shipped with or attached to unit before operating your new
heat pump.
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 temperature
control selector, a FAN control, and a SYSTEM or MODE control.
COOLING MODE
When operating in cooling mode, your 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 “off” periods than on
moderate days.
The following are typical conditions that add extra heat and/or
humidity to your home. Your heat pump will work longer to keep
your home comfortable under these conditions:
1. Entrance doors are frequently opened and closed
2. Laundry appliances are being operated
3. A shower is running
4. More than the usual number of people are present in the home
5. More than the normal number of electric lights are in use
6. Drapes are open on the sunny side of the home
HEATING MODE
With the SYSTEM or MODE control of your indoor thermostat 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 for longer periods to maintain
a comfortable environment on cooler days and nights than on
moderate ones.
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 coil. If allowed to build up, this ice
would impede airflow across the coil and reduce the amount of
heat absorbed from the outside air. So, to maintain energy-efficient
operation, your heat pump has an automatic defrost mode. The
defrost mode starts at a preset time interval of 60 minutes. Defrost
will start at the preset time only if the ice is sufficient to interfere
with normal heating operation. After the ice is melted from the
Fig. 2—Carrier Non-Programmable Thermostat
2