Carrier 52M Performance Series Manual de usuario descargar pdf (Pagina 14)

HEAT PUMPS PAY THEIR

OWN WAY

Heat pump models are available at a nominal

additional cost. In many locales, the payback is

realized in just a few months. Cost and payback

details are provided on the next page.

SPECIAL FEATURES

Two-Stage Thermostat:

The indoor thermostat senses the indoor temperature

and automatically turns on the electric heat to warm

the room quickly. After the desired temperature

conditions have been satisfied, the thermostat

automatically switches to heat pump mode. If

compressorfailureoccurs,thethermostatwillprovide

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 28˚ F (--2.2˚ C) or below for one

minute. Thethermostatswitches theunitback toheat

pump mode when the outdoor coil temperature rises

above40˚ F (4.4˚ C)fortenminutes,which isenough

to provide heat to meet demand. The entire operation

is completely automatic.

Reversing Valve:

The reversing valve provides quiet refrigerant flow

when energized in heating mode. The valve controls

the direction of refrigerant flow for both heating and

cooling functions and remains en

erg

ized as long as

the controls are in the heat position. When the

cooling controls are activated, the valve automatically

reverses to the cooling position.

Manual Compressor Override Configuration:

HOW THE HEAT PUMP WORKS

A07553

In Hot Weather:

A07553

In Cool Weather:

When the outdoor coil temperature is above 28˚ F

(--2.2˚ C), the heat pump draws heat from outdoorair

and uses it toheat indoorair. Sinceheat istransferred

and not produced, Gree’s heat pump uses less

electricity and reduces energy costs significantly.

A07554

In Sub-Freezing Weather:

When the outdoor coil temperature falls below 28˚ F

(--2.2˚ C) for one minute, the unit automatically

switchesonabuilt--inelectricheater.Thecompressor

stopsand theindoorfancirculateswarm airproduced

bytheheater.Whentheoutdoorcoiltemperaturerises

above 40˚ F (4.4˚ C) for ten minutes, heat pump

operation resumes automatically.

Gree’s PTAC units provide indoor comfort in the same

manner as conventional air conditioners, removing

heat and humidity fromindoor air. The heat and

humidity is released to the outdoors. Gree’s high

efficiency design saves energy and reduces cooling

costs.

This configuration dip switch completely locks out

the compressor. See Owners Manual for more

details.Note that the compressor and heater do not

operate at the same time, thus conserving energy.

APPLICATIONS

• Hotels and motels

• Nursing homes and assisted living care

centers

• Offices

• Apartments

• Single--family dwellings

• Home conversions and residential add--ons

NEW CONSTRUCTION

ADVANTAGES FOR NEW

CONSTRUCTION

Design Flexibility for the Architect/Engineer

• Whisper--quiet performance, indoors and out

• No bulky duct system

• No separate equipment room

• No water towers or additional cooling

equipment

• No complex match--up of different HVAC

components

• Less sensitivity to building orientation (sun,

wind, shade)

• Optional architectural grille to permit custom

exterior appearance

I nitial Cost Savings for the Buildin

g Owner

• N

o expensive component HVAC system

purchase

• No equipment room or maintenance

engineering staff

• Two--part delivery to minimize on--site

damage

• Weather--protected wall sleeve that goes in

place during construction; chassis that slides

in place after construction

• No seasonal changeover required for cooling

or heating -- units are self--contained comfort

systems

Lower Operating Costs and Reliable Comfort

for The Occupant

• Heat pump models offer substantial savings

over models with conventional electric

resistance heaters

• Individual units allow tenants to choose the

degree of comfort and operating economy.

• Rapi

d servicing reduces downtime: complete

chassis can be replaced in minutes without

disrupting other occupants.

• Each unit operates independently of other

units in the building. No dependency by

building on central HVAC system.

RETROFIT/REPLACEMENT

If you are replacing a unit in an existing wall sleeve,

your options include:

• Replace the existing wall sleeve with the

the polymer wall sleeve. See accessory sleeve

section for selecting the correct sleeve for

your application.

NOTE: in most cases, when replacing the

wall sleeve, the exterior grille must also be

replaced.

• Use an existing sleeve and exterior grille. The

Gree GA series PTAC will fit into:

—

— Friedrich T series and ZoneAire wall

sleeves, with a required wa

ll slee

extension (see accessory Friedrich

Retrofit Wall Sleeve Adapter).

Whether you are designing a new structure or

replacing packaged terminal air conditioning units in

an existing building, Gree GA Series will meet your

needs.

The Gree GA series Packaged Terminal Air

Conditioning (PTAC) unit is designed to meet the

needs of the architect, engineer, and contractor. For

unit installation, Gree’s expert support network will

assist in all applicable aspects of the construction

project, from preparing a budget to start-up.

The following major competitors’ wall

sleeves/grilles: Carrier, GE, Amana,

Trane, Friedrich and Bryant, and NO

accessory retrofit kit is required.

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