Carrier 52S series Manuel d'utilisateur télécharger pdf (Page 11)

PRODUCT FEATURES AND BENEFITS (cont)

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.

How The Heat Pump Works

Special Features

Two-Stage Indoor Thermostat:

The indoor thermostat senses the indoor temperature

and automatically turns on electric heat to warm the

room quickly, automatically switches to heat pump mode

when the room reaches the desired temperature, and

provides automatic backup heat if the compressor should

fail.

Outdoor Thermostat:

During the heating cycle, the outdoor thermostat senses

outdoor temperature. It switches the unit to electric

heat mode when the outdoor temperature is 25 F

or below. The thermostat switches the unit back to heat

pump mode when the outdoor temperature rises above

40 F, which is enough to provide heat to meet de-

mand. The entire operation is completely automatic.

Reversing Valve:

The reversing valve provides quiet refrigerant ﬂow af-

ter 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 ac-

tivated, 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.

In Hot Weather:

Carrier’s Series 52 units provide

indoor comfort in the same man-

ner as conventional air condition-

ers, removing heat and humidity

from indoor air. The heat and hu-

midity is released to the out-

doors. Carrier’s high efficiency

design saves energy and reduces

cooling costs.

In Cool Weather:

When the outdoor temperature is

above 25 F, 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 elec-

tricity and reduces energy costs

signiﬁcantly.

In Sub-Freezing Weather:

When the outdoor temperature

falls below 25 F, the unit auto-

matically switches on a built-in

electric heater. The compressor

stops and a blower circulates

warm air produced by the heater.

When the outdoor temperature

rises above 40 F, heat pump op-

eration resumes automatically.

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Carrier 52S series Manuel d'utilisateur Page 11

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