Carrier 52CQ Manuale Utente Scaricare il pdf (Pagina 10)

HEAT PUMPS PAY THEIR

OWN WAY

Heat pump models are available at a nominal addi-

tional cost. In many locales, the payback is realized in

just a few months. Cost and payback details are pro-

vided on the next page.

Special Features

Two-Stage Indoor Thermostat:

The indoor thermostat senses the indoor temperature

and automatically turns on the electric heat to warm

the room quickly. After the desired temperature condi-

tions have been satisfied, the thermostat automatically

switches to heat pump mode. If compressor failure

occurs, the thermostat will provide backup electric

heat automatically.

Outdoor Thermostat:

During the heating cycle, the outdoor thermostat

senses outdoor coil temperature. It switches the unit to

electric heat mode when the outdoor coil temperature

is 20 F or below (approximately 35 F outdoor air tem-

perature). The thermostat switches the unit back to

heat pump mode when the outdoor coil temperature

rises above 35 F (approximately 45 F outdoor air tem-

perature), which is enough to provide heat to meet

demand. The entire operation is completely automatic.

Reversing Valve:

The reversing valve provides quiet refrigerant flow

after the unit shuts off. The valve controls the direction

of refrigerant flow for both heating and cooling func-

tions and remains energized as long as the controls are

in the heat position. When the cooling controls are

activated, the valve automatically reverses to the cool-

ing position.

Manual Compressor Override Switch:

This switch completely locks out the compressor. Note

that the compressor and heater do not operate at the

same time, thus conserving energy.

PRODUCT FEATURES AND BENEFITS (cont)

How The Heat Pump Works

In Hot Weather:

Carrier’s 52C series units provide indoor comfort in

the same manner as conventional air conditioners,

removing heat and humidity from indoor air. The heat

and humidity is released to the outdoors. Carrier’s

high efficiency design saves energy and reduces cool-

ing costs.

In Cool Weather:

When the outdoor coil temperature is above 20 F

(approximately 35 F outdoor air temperature), the heat

pump draws heat from outdoor air and uses it to heat

indoor air. Since heat is transferred and not produced,

Carrier’s heat pump uses less electricity and reduces

energy costs significantly.

In Sub-Freezing Weather:

When the outdoor coil temperature falls below 20 F

(approximately 35 F outdoor air temperature), the

unit automatically switches on a built-in electric

heater. The compressor stops and a blower circulates

warm air produced by the heater. When the outdoor

coil temperature rises above 35 F (approximately 45 F

outdoor air temperature), heat pump operation

resumes automatically.

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Carrier 52CQ Manuale Utente Pagina 10

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