Carrier GP, GS, GB, GW, GT Owner's Manual

GT, GP, GB, GS, GW
Geothermal Heat Pumps

Owner’s Manual

A NOTE ABOUT SAFETY

Any time you see this symbol in manuals, instructions and on
the unit, be aware of the potential for personal injury. There are three
levels of precaution:

DANGER identifies the most serious hazards which will result in
severe personal injury or death.

WARNING signifies hazards that 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 which will result in enhanced
installation, reliability, or operation.

!

PERSONAL INJURY, DEATH AND / OR PROPERTY
DAMAGE HAZARD

Failure to follow this warning could result in personal injury,
death or property damage.

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 assistance. The
qualified installer or service agency must use
factory--authorized kits or accessories when modifying this
product.

Read and follow all instructions and warnings, including labels
shipped with or attached to unit before operating your new
geothermal heat pump.

WARNING

YOUR NEW SYSTEM

Congratulations on the purchase of your new geothermal system.
Please take a few moments to read this document to familiarize

yourself with the unit operation.
Use this document to:

S Record model information of your unit for future reference
S Record the earth loop location (see page 3)
S Record service history (see page 4)

REGISTER YOUR SYSTEM

To obtain the longer warranty periods as shown on the Warranty
Certificate table under original owner, for the original purchaser,
the product must be properly registered at www.cac-bdp.com
within ninety (90) days of original installation. In jurisdictions
where warranty terms conditioned on registration are prohibited by
law, registration is not required and the longer warranty period
shown will apply.

MODEL NUMBER: __________________________________

SERIAL NUMBER: __________________________________

INSTALLATION DATE: ______________________________

INSTALLING DEALER: ______________________________

DEALER PHONE NUMBER: __________________________

HEATING AND COOLING YOUR HOME

Your geothermal system operation is controlled by the thermostat
which is generally mounted in a central location in the home.

A wide variety of thermostats can be used with your geothermal
unit. You can set the desired heating and cooling “set-points” on
your thermostat. The thermostat senses indoor temperatures and
sends a signal to the geothermal unit to heat, cool, turn off, or
change stages.

For enhanced comfort, consider setting your thermostat in
“constant fan” mode. This mode keeps the fan/blower operating
continuously which can provide more consistent temperatures
throughout the home, eliminating hot spots and cold spots.

Using the “auto change-over” mode on your thermostat will enable
the unit to automatically switch from heating to cooling (and
vice-versa) when necessary. This mode is beneficial, for example,
during the spring or fall when heating may be needed at night and
cooling may be needed during the day.

THERMOSTATS

A wide variety of thermostats can be used with your geothermal
unit. For thermostat operation instructions, refer to the thermostat
Owner’s Guide.

PROGRAMMABLE THERMOSTATS

If your thermostat is programmable, using the set-back feature can
provide additional energy savings. However, energy savings may
not be maximized if the heating set-back temperature is
substantially different from the normal temperature. For example,
if you want the “occupied” temperature to be 72ºF (22ºC), and you
program the thermostat for a set-back temperature of 60ºF (15ºC),
then the geothermal unit will likely engage the auxiliary back-up
heat when it is time for the normal temperature setting to be
achieved, in order to attain the programmed higher temperature in a
short period of time. The energy savings gained during the
set-back period may be lost if the unit has to operate with auxiliary
electric to bring the temperature back up to the normal setting.
Therefore, it is recommended to limit the difference between the
normal temperature setting and the set-back temperature during
heating to minimize the use of auxiliary electric.

ACCESSORIES

Other accessories, like zoning systems, humidifiers, high efficiency
air cleaners etc., can also be used with your geothermal system to
provide additional comfort, energy savings and improved indoor
air quality.

For instructions on operating these accessories, refer to the
Owner’s Guides.

VARIABLE SPEED OPERATION

If your geothermal unit is equipped with a two-stage compressor
and variable speed blower, you may notice your system runs for
longer periods of time. This system is designed to meet cooling or
heating needs of the home at a wide range of conditions. During
days when the outdoor temperature is moderate, operation in low
speed or low stage is common. When the outdoor temperature is
extreme, the unit will generally operate on high speed/high stage.
Longer “run times” on the unit result in indoor temperature that is
more consistent with fewer drafts, better humidity control,
enhanced comfort and enhanced energy efficiency.

HEATING MODE

During heating, your geothermal unit absorbs heat energy from the
ground using the earth loop (or well water). This low intensity heat
is transferred to refrigerant, intensified by the unit’s compressor,
and then transferred to the air through the indoor air coil. (When a
“water-to-water” style geothermal unit is used, the unit heats water,
not air, and delivers warm water to the home’s hydronic heating
system.)

Unless you live in a climate that doesn't get very cold, your
geothermal unit will likely have a back-up source of heat. This is
done either with an auxiliary heat accessory or a fossil-fuel furnace.
During extreme conditions, the geothermal unit may use the
back-up electric resistance heater to supplement the output.

If the geothermal unit is connected to a gas furnace, the geothermal
system will turn off and allow the fossil-fuel furnace to operate
during very cold temperatures.

The outdoor temperature at which the auxiliary electric or fossil
furnace is used is dependent upon how the geothermal unit was
sized which determines its output capacity. The back-up source of
heat (either auxiliary electric or fossil fuel furnace) is also activated
in the unlikely event of a compressor failure in order to maintain
heating comfort. (When a “water-to-water” style geothermal unit is
installed, back-up heat, if used, is usually done with a boiler.)

COOLING MODE

During cooling, your geothermal unit removes heat from the air in
your home (just like an air conditioner). Unlike an ordinary air
conditioner, the geothermal unit sends the unwanted heat into the
ground. Heat is transferred from the indoor air, to the refrigerant, to
the ground loop fluid (or well water), and into the ground. Because
the ground temperatures are cooler than the outdoor air
temperatures, a geothermal unit operates more efficiently than an
ordinary air conditioner.

HOT WATER

If your geothermal unit is equipped with the device that provides
supplemental water heating, it will be connected to your water
heater. During heating and cooling operation, your geothermal unit
will move excess heat to a water line into the water heater by using
a small pump. This water heating function is only operational
during heating and cooling. The amount of hot water made by the
geothermal unit varies based on several conditions, and is usually
not sufficient to be the sole source of hot water. Your water heater
will still be connected to electricity or fossil fuel so that you will
have full capacity, regardless of the contribution by the geothermal
unit.

GEOTHERMAL EARTH LOOP

Your geothermal earth loop is the key to energy efficiency and
performance. The pipe is made using high-density polyethylene
with a formulation and specification to maximize the performance
when buried in the ground or submerged in a pond. All
outside/buried connections are made with heat fusion so there are
no clamps or glues that can deteriorate over time. The pipe and
connections don’t rust, rot or corrode and should last for decades.
Once the loop is installed, service is limited to ensuring that proper
levels of pressure are maintained and the circulating pump(s) are
operational to deliver the proper flow rate to the unit. The fluid in
the loop may include anti-freeze to prevent the liquid from
freezing.

WELL WATER / OPEN LOOP SYSTEM

If your geothermal unit is connected to your water well rather than
an earth loop, it is important to ensure that the proper water quality
and flow rate is maintained. Some maintenance is usually required
for these applications in order to keep the heat exchanger inside the
geothermal unit free of any mineral build-up. Periodic cleaning
highly recommended.
cleaning is dependent upon the quality of water. Poor water quality
will lead to reduced efficiency and capacity, along with the
potential for premature failure or corrosion of the heat exchanger.
Contact your dealer for recommendations on the service interval.

The frequency of this maintenance or

FILTERS

One of the most important things you can do for your geothermal
system is to keep the filter clean. A dirty filter causes excessive
restriction of air flow, leading to operational conditions in the unit
that could lead to high energy costs, poor comfort, excessive wear
and tear, noise, and premature failure. Your geothermal dealer will
be able to provide appropriate replacement filters.

OPERATION DURING CONSTRUCTION

Your geothermal heat pump contains components that can be
damaged by operation during the construction process.
Contaminants like drywall dust, sawdust, and chemicals can cause
damage and premature failure of your system. Although using an
extremely high efficiency filter may seem like the right solution,
the filter will “load up” quickly and may cause excessive pressures
and operational stress on the components. Using a standard, lower
efficiency filter will not provide adequate protection to the unit.
Units that fail due to operation during construction will not
covered under the warranty.
details.

See your Warranty Certificate for

be

is

2