Carrier 52S series Quick start guide

ARCHITECTS AND ENGINEERS’ MANUAL

October 2000 Copyright Carrier Corporation Cat. No. 592-074

CONTENTS

Page

APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

New Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Retrofit/Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .2

PRODUCT OVERVIEW. . . . . . . . . . . . . . . . . . . . . . .3

PRODUCT FEATURES AND BENEFITS . . . . 4-10

Quiet Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Most Efficient Performance . . . . . . . . . . . . . . . . . . . . . .4

Efficient Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

No Rust Weather Last™ Wall Sleeve and

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

One-Piece Washable Indoor Filter . . . . . . . . . . . . . . . . .5

Durable Control Panel Door and

Easy-to-Use Controls . . . . . . . . . . . . . . . . . . . . . . . . .6

Washable Vent Air Filter . . . . . . . . . . . . . . . . . . . . . . . .6

Bi-Directional Discharge Grille . . . . . . . . . . . . . . . . . . .6

Easy Access to Chassis. . . . . . . . . . . . . . . . . . . . . . . . . .7

Hidden Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Enhanced Copper Tubing. . . . . . . . . . . . . . . . . . . . . . . .8

Seamless Basepan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Page

Condensate Drain Valve. . . . . . . . . . . . . . . . . . . . . . . . . 8

Condensate Removal System. . . . . . . . . . . . . . . . . . . . . 8

Carrier Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Heat Pumps Pay Their Own Way. . . . . . . . . . . . . . . . . . 9

Heat Pump Energy Savings . . . . . . . . . . . . . . . . . . . . . 10

ORDERING DATA . . . . . . . . . . . . . . . . . . . . . . . . 11-20

Product Catalog Number . . . . . . . . . . . . . . . . . . . . . . . 11

Factory-Installed Options. . . . . . . . . . . . . . . . . . . . . . . 12

Field-Installed Accessories . . . . . . . . . . . . . . . . . . . . . 13

DIMENSION DRAWINGS AND

INSTALLATION DATA — NEW

CONSTRUCTION. . . . . . . . . . . . . . . . . . . . . . . . . 21-26

PRODUCT DATA . . . . . . . . . . . . . . . . . . . . . . . . . 27-35

WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . 36-40

GUIDE SPECIFICATIONS . . . . . . . . . . . . . . . . .41,42

TYPICAL WARRANTY . . . . . . . . . . . . . . . . . . . .43,44

LITERATURE LIST. . . . . . . . . . . . . . . . . . . . . . . . . . 45

STANDARD COLORS. . . . . . . . . . . Inside Back Cover

MODEL 52S

PACKAGED TERMINAL

AIR CONDITIONERS

AND HEAT PUMPS

Whether you are designing a new structure or replac-

ing the packaged terminal air conditioning units in an

existing building, Carrier will meet your needs.

• Hotels and motels

• Nursing homes and assisted living care centers

•Offices

• Apartments

• Single-family dwellings

• Home conversions and residential add-ons

NEW CONSTRUCTION

The Carrier 52S unit is designed to meet the needs of

the architect, engineer, and contractor. For unit instal-

lation, Carrier’s expert support network will assist in

all applicable aspects of the construction project, from

preparing a budget to start-up.

ADVANTAGES OF THE PACKAGED TERMINAL AIR

CONDITIONER FOR NEW CONSTRUCTION

RETROFIT/REPLACEMENT

If you are replacing existing units, your options

include:

• Replacing the existing wall sleeve with a Carrier

Weather Last™ sleeve

• Using an existing sleeve made by another manufac-

turer. The 52S Series chassis can be adapted with a

simple accessory kit to fit existing GE, Amana, and

Trane wall sleeves. All other sleeve applications

need approval from Carrier.

DESIGN FLEXIBILITY

FOR THE

ARCHITECT/ENGINEER

• Super-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

INITIAL COST SAVINGS

FOR THE

BUILDING OWNER

• No 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 conventional electric

resistance heaters

• Individual units allow tenants to choose the degree of comfort and

operating economy

• Rapid 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 individual units.

APPLICATIONS

This section summarizes product features covered in

detail in later sections:

PRODUCT OVERVIEW

Polymer Sleeve — Designed for rugged

duty, acoustic absorption, and attractive

appearance for years to come.

Rotary Compressors — Provide quiet, reli-

able operation.

Copper Tube Fin Coils — Enhanced coils

provide durability, high performance, and

ease of operation.

Fresh Air Control Arm — Allows outdoor

air into room through foam filter for improved

air quality.

Fan Cycle Switch — Dual options:

(1) Continuous fan operation.

(2) Cycle fan ON and OFF with compressor

operation.

Temperature Limiter — Allows tempera-

ture range restraints for the unit by making a

simple service adjustment.

Control Door — Provides protection for

controls and enhances appearance.

Wall Thermostat — Up to six field wiring

terminals for connecting a wall thermostat.

Easy Access to Electrical Components

— Simply remove two screws and drop

down the control box.

Improved Condensate Removal — Mini-

mizes condensate water on outside of

building.

Thermostat — Provides improved tempera-

ture control.

New One-Piece Filter Design — Provides

improved air filtration and can be removed

easily for cleaning.

Durable Discharge Grille — Made of poly-

carbonate; holds up under the toughest

conditions.

Louvered Front Cover — Made of durable

polycarbonate. Provides improved perfor-

mance and quiet operation.

The 52S model is a single-package, through-the-wall

unit for heating and cooling hotel rooms, offices,

apartments, condominiums, and residential additions.

The 52S Series features include:

• Quiet operation

• Exceptional energy efficiency ratios (EERs)

• Multi-room structure design

• Fixed wall sleeve, slide-out chassis

• Attractive, durable cabinet

• Chassis that retrofits to most major competitors’

sleeves

• Low operating costs

• No bulky duct system

• No seasonal changeover

QUIET OPERATION

Occupants and neighbors are protected against noise

intrusion. Indoor sound reduction is achieved because

of the unit’s design and its louvered front cover, split

scroll and blower, and heavy gage unit partition.

Rotary compressors provide quiet, reliable operation.

The split scroll provides a more uniform air discharge.

The new aerodynamic condenser shroud design

improves airflow and reduces outdoor noise, providing

a more relaxing outdoor environment. The propeller-

type fan and stator design allow efficient low-speed

operation.

MOST EFFICIENT

PERFORMANCE

High EERs provide excellent operating economy. The

system operates without bulky ductwork, separate

equipment room, and complex match-up of different

components. Heating and cooling modes are available

without seasonal changeover.

EFFICIENT FAN MOTOR

An efficient, totally enclosed PSC (permanent split

capacitor) fan motor provides a choice of high or low

speeds for heating and cooling. A fan-only setting pro-

vides air circulation. The fan motor requires no

maintenance and no lubrication.

PRODUCT FEATURES AND BENEFITS

The Quiet is engineered into every 52S Unit.

NO-RUST WEATHER LAST™

WALL SLEEVE AND FRONT

PANEL

The indoor front panel and wall sleeve use nonmetallic

compounds that never rust or corrode, do not support

combustion, and do not give off toxic fumes. The

weather-resistant feature exceeds requirements of

Underwriters’ Laboratories and resists damage caused

by impact and scratching. The Weather Last feature

also insulates and has up to 10 times the acoustic

absorption of metal cabinets.

Removable Front Panel

The louvered front panel fits firmly onto the chassis.

The panel is easily removed for service and filter

access without removing screws. It provides front air

intake to enhance performance and quiet operation. It

also provides the option of flush mounting to the floor.

ONE-PIECE WASHABLE

INDOOR FILTER

The filter covers the entire surface area of the coil.

Once the front panel is removed, the filter simply

snaps out of the track. The one-piece, molded plastic

frame with polyurethane filter retains its shape and

meets hospital and nursing home requirements. The

filter may be washed or vacuumed repeatedly.

Removable Front Panel

One-Piece Indoor Filter

Wall Sleeve

DURABLE CONTROL PANEL

DOOR AND EASY-TO-USE

CONTROLS

The reinforced control door conceals controls and fea-

tures an attractive surface that will not chip. The hinge

and door are extruded as one piece and provide protec-

tion from demanding transient use. The door is sloped

to discourage use as a shelf. Easily accessible from the

room side, the control buttons and thermostat are

clearly marked and simple to use.

WASHABLE VENT AIR FILTER

The unique duct system is activated by a two-position

control. Fresh outside air is redirected by the vent door

to an inside low-pressure area. A molded plastic filter

prevents dirt and debris from entering the room side of

the unit. The vent mechanism is made from noncorro-

sive material ensuring reliable operation. High-

pressure airflow creates a tight, draft-free seal when

the vent door is closed.

BI-DIRECTIONAL

DISCHARGE GRILLE

The discharge grille is made of durable polycarbonate

and is reversible. Air flows upward at an 80 degree

angle to the floor but can easily be adjusted toward the

horizontal for airflow at a 53 degree angle to the floor.

The discharge grille is cool to the touch during the

heating cycle.

PRODUCT FEATURES AND BENEFITS (cont)

VENT

DOOR

OUTDOOR

VENT

FILTER

52S Cooling/Heating Unit Control Panel

Outdoor Vent Filter Location

(Left Side of Chassis)

Reversible Polycarbonate Discharge Grille

EASY ACCESS TO CHASSIS

Access to the chassis simply requires removing four

screws and then sliding the chassis out of the sleeve

for service. Once the power is turned off, connectors

can be separated on hard-wire units, or the power cord

can be disconnected on cord-connected units.

HIDDEN CONTROLS

The factory-wired control box houses all control com-

ponents and is quickly accessible without removing

the chassis from the wall sleeve. Remove two screws

and the hinged door lowers, providing quick access to

all the components and the wiring diagram.

Temperature Limiter

The limiter reduces operating costs by allowing the

owner to control the range of cooling and heating tem-

peratures available to the occupant. It is located under

the control panel, out of the occupant’s sight. Each set-

back on the limiter is equivalent to 5° F and the range

of temperature settings available to the owner is from

60 to 90 F. The limiter is not pre-set at the factory.

The occupant’s temperature control knob is conve-

niently located on the control panel and is clearly

marked with a range of dial settings.

Outdoor Air Vent Control

The vent knob is located under the front panel. This

knob slides to manually open and close the outdoor

vent.

Fan Cycle Switch

This switch (not available on wall thermostat models)

allows the fan to operate in 2 modes:

• Continuous — This setting allows the fan to run

continuously, circulating air even when the temper-

ature setting has been satisfied. This setting, which

helps to keep the room temperature closer to the

thermostat setting, is used for maximum comfort.

• Cycle — This setting allows the fan to cycle on and

off with the compressor during heating or cooling.

The fan stops when the temperature setting is

reached. The longer unit off-time makes this option

more energy-efficient with only slightly wider vari-

ations in room temperature.

Easy Service Access

ENHANCED COPPER TUBING

Enhanced copper tubing is more efficient and durable

and can be repaired in the field, if required.

Because copper is a very stable metal, it is durable and

resists corrosion. Enhanced copper tubing increases:

• heat transfer capability

• the efficiency of the cooling and heating processes

• thermal conductivity (by creating additional tube

surface and turbulent refrigerant gas flow)

Every Carrier PTAC coil undergoes thorough leak test-

ing and pressure testing up to 350 lbs per square inch.

SEAMLESS BASEPAN

Seamless drawn basepan walls add protection against

water accumulation resulting from storm-driven rain

with heavy wind.

Carrier’s deep basepan holds up to two gallons of

water without spilling. Closed cell foam insulators are

located between the basepan and coils, keeping coils

from direct contact with the basepan and providing

additional protection against corrosion.

CONDENSATE DRAIN VALVE

The temperature-activated drain opens when the out-

door temperature drops below 45 F to prevent water

from freezing in the basepan.

CONDENSATE REMOVAL

SYSTEM

Carrier’s 52S Series units have a slinger ring around

the outside of the outdoor fan propeller. Condensate

(water) in the unit basepan is picked up by the slinger

ring and dispersed onto the hot outdoor condenser

coil. The heat from the coil evaporates the con-

densate and cools the coil at the same time, thereby

removing condensate and increasing the unit’s

efficiency.

NOTE: If it is necessary to remove 100% of the con-

densate, we recommend using the Carrier Drain Kit

(Part No.: DRAIN-KIT-4PK).

CARRIER WARRANTY

Carrier’s full one-year warranty is the most compre-

hensive in the industry. In addition, Carrier provides:

• Full coverage for parts and labor.

• Four additional years of coverage on sealed refrig-

eration systems.

• Limited second through fifth year coverage on non-

refrigeration system parts.

PRODUCT FEATURES AND BENEFITS (cont)

BASEPAN

CONDENSATE

DRAIN VALVE

Enhanced Copper Tubing

Deep Basepan Protects Against

Water Accumulation

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 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 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 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.

In Hot Weather:

Carrier’s Series 52S 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 effi-

ciency 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

electricity 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 circu-

lates warm air produced by the

heater. When the outdoor

temperature rises above 40 F,

heat pump operation resumes

automatically.

HEAT PUMP ENERGY SAVINGS

CARRIER HEAT PUMP INITIAL COST VERSUS SAVINGS OVER HEAT/COOL MODELS

* Computer projections based on full cooling load at 95°F. Savings projected for 230-v ratings only.

1Heating load is 5,000 Btuh at winter design point temperature.

2Heating load is 10,000 Btuh at winter design point temperature.

3Heating load is 15,000 Btuh at winter design point temperature.

ZONE ELECTRIC

COST/kWH

7000 BTUH1

COOLING

CAPACITY

$60

PREMIUM

9000 BTUH2

COOLING

CAPACITY

$75

PREMIUM

12000 BTUH2

COOLING

CAPACITY

$90

PREMIUM

14000 BTUH3

COOLING

CAPACITY

$110

PREMIUM

Annual

Savings*

Payback

in Months

Annual

Savings*

Payback

in Months

Annual

Savings*

Payback

in Months

Annual

Savings*

Payback

in Months

I$.06 $ 31.00 23 $ 58.07 16 $ 63.39 17 $ 77.45 17

$.08 $ 41.69 17 $ 76.74 12 $ 82.52 13 $103.64 13

$.10 $ 52.38 14 $ 96.44 9 $102.86 11 $129.82 10

$.06 $ 47.03 15 $ 87.11 10 $ 94.48 11 $113.45 12

$.08 $ 63.07 11 $116.15 8 $126.78 9 $150.55 9

$.10 $ 79.10 9 $145.19 9 $157.87 7 $187.64 7

III

$.06 $112.24 6 $108.89 8 $114.82 9 $138.55 10

$.08 $148.59 5 $144.15 6 $153.09 7 $185.45 7

$.10 $186.00 4 $168.00 5 $191.36 6 $231.27 6

$.06 $ 42.76 17 $100.59 9 $105.25 10 $127.64 10

$.08 $ 69.48 10 $132.74 7 $138.74 8 $170.18 8

$.10 $ 87.66 8 $166.96 5 $174.62 6 $211.64 6

$.12 $103.69 7 $200.15 4 $209.30 5 $255.27 5

$.14 $121.86 6 $233.33 4 $243.98 4 $297.82 4

$.16 $140.03 5 $266.52 3 $278.67 4 $339.27 4

$.06 $ 41.69 17 $ 78.81 11 $ 82.52 13 $ 99.27 13

$.08 $ 55.59 13 $105.78 9 $110.03 10 $133.09 10

$.10 $ 69.48 10 $131.70 7 $137.54 8 $166.91 8

$.12 $ 83.38 9 $158.67 6 $165.05 7 $199.64 7

$.14 $ 97.28 7 $189.59 5 $192.56 6 $233.45 6

$.06 $110.10 7 $206.37 4 $221.26 5 $268.36 5

$.08 $146.45 5 $275.85 3 $295.41 4 $357.82 4

$.10 $182.79 4 $344.30 3 $368.37 3 $447.27 3

$.12 $220.21 3 $413.78 2 $442.52 2 $536.73 2

PRODUCT FEATURES AND BENEFITS (cont)

ZONE V

ZONE IV

ZONE III

ZONE I

ZONE

ZONE II

Heat pumps save more on operat-

ing costs during the heating cycle

than heat/cool models. The table

below shows that the higher initial

cost of purchasing a heat pump is

quickly made up in lower operating

costs.

Use the map to identify the climate

zone’s designated number. Reading

down the left-hand column of the

table, select the cost/kWh rate in

this zone that most closely approxi-

mates your local rate. The approxi-

mated savings and payback period

is found at the intersection of your

zone/rate line and the desired Btuh

Cooling Capacity column. Exact

savings are determined by lifestyle,

local electrical rates, and climatic

conditions.

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