Carrier PREMIER 52P SERIES User manual

ARCHITECTS AND ENGINEERS’ MANUAL
May 2002 Copyright Carrier Corporation Cat. No. 592-080
CONTENTS
Page
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,4
New Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Retrofit/Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Carrier Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Application Considerations . . . . . . . . . . . . . . . . . . . . . .4
PRODUCT OVERVIEW. . . . . . . . . . . . . . . . . . . . . . .5
PRODUCT FEATURES AND BENEFITS . . . . 6-13
Quiet Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Most Efficient Performance . . . . . . . . . . . . . . . . . . . . . .6
Efficient Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
No-Rust Weather Last™ Wall Sleeve and
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Removable Front Panel . . . . . . . . . . . . . . . . . . . . . . . . .7
Anti-Theft Knobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Two-Piece Lifetime Indoor Filter. . . . . . . . . . . . . . . . . .8
Washable Vent Air Filter . . . . . . . . . . . . . . . . . . . . . . . .8
Bi-Directional Discharge Grille . . . . . . . . . . . . . . . . . . .8
Power Cord for 265-V Units . . . . . . . . . . . . . . . . . . . . .9
Bi-Molded Condenser Shroud . . . . . . . . . . . . . . . . . . . .9
Snow Baffle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Easy Access to Chassis. . . . . . . . . . . . . . . . . . . . . . . . .10
Hidden Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Enhanced Copper Tubing. . . . . . . . . . . . . . . . . . . . . . . 11
Page
Seamless Basepan . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Condensate Drain Valve. . . . . . . . . . . . . . . . . . . . . . . . 11
Condensate Removal System. . . . . . . . . . . . . . . . . . . . 11
Heat Pumps Pay Their Own Way. . . . . . . . . . . . . . . . . 12
Heat Pump Energy Savings . . . . . . . . . . . . . . . . . . . . . 13
ORDERING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Product Catalog Number . . . . . . . . . . . . . . . . . . . . . . . 14
FACTORY-INSTALLED OPTIONS . . . . . . . . . . . 15
FIELD-INSTALLED ACCESSORIES . . . . . . 16-23
DIMENSION DRAWINGS AND
INSTALLATION DATA — NEW
CONSTRUCTION. . . . . . . . . . . . . . . . . . . . . . . . . 24-29
PRODUCT DATA . . . . . . . . . . . . . . . . . . . . . . . . . 30-37
EXPANDED RATINGS DATA. . . . . . . . . . . . . . .38,39
SOUND DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . 41-47
GUIDE SPECIFICATIONS . . . . . . . . . . . . . . . . .48,49
TYPICAL WARRANTY . . . . . . . . . . . . . . . . . . . .50,51
ACCESSORY LIST . . . . . . . . . . . . . . . . . . . . . . . . . . 52
PREMIER SERIES 52P
COMFORT SERIES 52C
PACKAGED TERMINAL
AIR CONDITIONERS
AND HEAT PUMPS
For more information available on the internet, see the www.carrier.com or www.lodgingAC.com web sites.

2
Valued Carrier Customer,
Carrier’s Architects and Engineer’s manual has been specifically developed to make your
product and accessory selection easier and faster. This manual will help you customize
your application to ensure the greatest comfort for your guests and the highest reliability
and lowest costs for you.
Enjoy the ultimate in comfort, humidity control, and energy savings with Carrier’s com-
plete line of Packaged Terminal Air Conditioning (PTAC) products. Choose from either
the Premier series (52P) which is Carrier's most energy efficient PTAC unit ever, or the
Comfort series (52C) for mid-range energy efficiency and outstanding value.
The Premier and Comfort series PTAC lines have many common features and benefits.
The 52P and 52C units are both built on the same platform with common components and
airflow systems to ensure the highest quality product for your money. The most significant
difference between the 52P and 52C products is the refrigerant system. The Premier refrig-
erant system utilizes Carrier's highest efficiency compressors and coil design to achieve
maximum energy efficiency. The Comfort refrigerant system uses our standard efficiency
compressors and coils to attain competitive efficiency levels which exceed the industry
standard ARI minimum-efficiency levels.
It’s your choice. Choose the Premier series and start recovering your investment immedi-
ately through energy savings, or choose our Comfort series and enjoy years of economical,
trouble-free operation and comfort.
Thank you for choosing Carrier and investing in the highest quality air conditioning and
heating system ever.
Best regards,
Lodging Products Group

3
Whether you are designing a new structure or replac-
ing 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 52P and 52C Packaged Terminal Air Con-
ditioning (PTAC) 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 FOR NEW CONSTRUCTION
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 exte-
rior 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
models with conventional electric resistance heaters
• Individual units allow tenants to choose the degree
of comfort and operating economy
• Rapid servicing reduces downtime: complete chas-
sis 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 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 52P and 52C Series chassis will fit exist-
ing GE, Amana, Trane, and Bryant wall sleeves and
no retrofit kit is required. All other sleeve applica-
tions need prior approval from Carrier.
CARRIER WARRANTY
Carrier’s five-year warranty is the most comprehen-
sive in the industry. Carrier provides:
• Full coverage for parts and labor for first year.
• Four additional years of full coverage on sealed
refrigeration systems.
• Limited second through fifth year coverage on non-
refrigeration system parts.
APPLICATIONS

4
APPLICATION
CONSIDERATIONS
Installation instructions are shipped with all PTAC
units. It is important that air conditioning systems be
properly sized and installed for each application in
order to achieve the desired temperature and humidity
levels within the space to be conditioned. It is strongly
recommended that a professional engineer match the
PTAC units with the building structure and climate.
The following application considerations are all
important in choosing the proper PTAC system for the
building structure.
Undersizing
If a PTAC unit is undersized (cooling capacity is less
than required capacity for an application), the unit will
not be able to cool the space down to the desired tem-
perature during very hot days. The result could be
warm and humid or warm and dry conditioned space.
Oversizing
If a PTAC unit is oversized (cooling capacity is greater
than required capacity for the specific application), the
unit will cool the space down to the desired tempera-
ture too quickly.
The unit will cycle on and off, however, dehumidifica-
tion only takes place when the unit is operating. The
result of this type of application in a hot and/or humid
climate would be a cool, yet excessively humid, space.
Air Infiltration
Excessive air infiltration can intensify problems asso-
ciated with undersizing or oversizing a PTAC unit.
This can be the cause of insufficient cooling, dehumid-
ification, or heating. Sources of air infiltration include
vents, gaps around windows and doors, and improp-
erly sealed floors, ceilings or wall joints.
APPLICATIONS (cont)

5
This section summarizes product features covered in
detail in later sections of this manual:
PRODUCT OVERVIEW (52P AND 52C)
COPPER TUBE
ALUMINUM
FIN COILS
DISCHARGE
GRILLE
WIRE SCREEN
LOUVERED
FRONT
PANEL
INDOOR
COIL
BASEPAN FOR
CONDENSATE
REMOVAL
2 AIR
FILTERS
FRESH AIR
CONTROL
ARM
ROTARY
COMPRESSORS
WALL
SLEEVE
ACCESS TO ELECTRICAL
COMPONENTS THROUGH
CONTROL BOX DOOR
CONTROL
DOOR
MODE
SELECTION
SWITCH
THERMOSTAT WITH
TEMPERATURE
LIMITER
2-WAY BI-MOLDED
CONDENSER
SHROUD
Polymer, Metal or Extended Wall Sleeve — Designed for rugged duty, acoustic absorption, and attractive appearance for years to
come.
Rotary Compressors — Provide quiet, reliable operation.
Copper Tube Aluminum Fin Coils — Enhanced coils provide durability, high performance, and ease of operation.
Fresh Air Control Arm — Allows outdoor air into room through vent filter for improved air quality.
Fan Cycle Switch — Dual options:
(1) Continuous fan operation.
(2) Cycle fan ON and OFF with compressor operation.
Thermostat with Temperature Limiter — Provides improved temperature control with a temperature limiter that allows tempera-
ture range restraints for the unit by making a simple adjustment.
Anti-Theft Knobs — Provides protection against theft of the thermostat knob and the mode selection knob.
Control Door — Provides protection for controls and enhances appearance.
Easy Access to Electrical Components — Simply remove two screws and drop down the control box door.
Improved Condensate Removal — Minimizes condensate water on outside of building.
New Two-Piece Filter Design — Provides improved air filtration and can be removed easily for cleaning.
Durable Discharge Grille — Made of polycarbonate; holds up under the toughest conditions.
Louvered Front Panel — Made of high impact polystyrene. Provides improved performance and quiet operation.
Mode Selection Switch — Rotary switch allows for easy selection of operating mode.
Bi-Molded Condenser Shroud — The two-piece condenser shroud allows easy access for service and maintenance to the out-
door coil and other components.

6
The 52P and 52C models are a single-package,
through-the-wall unit for heating and cooling hotel
rooms, offices, apartments, condominiums, and resi-
dential additions. Features include:
• Improved sound quality for quiet operation
• Exceeds ARI efficiency requirements with excep-
tional energy efficiency ratios (EERs)
• Easy access, lifetime filters
• User friendly controls
• Easy to read dials
• Enhanced temperature and humidity control
• Improved condensate removal system
• Multi-room structure design
• Fixed wall sleeve, slide-out chassis
• Attractive, durable cabinet featuring new design
• Chassis that easily retrofits to most major competi-
tors’ sleeves without use of retrofit kit
• 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, indoor
scroll and blower, and heavy gage unit partition.
Rotary compressors provide quiet, reliable operation.
The indoor scroll provides a more uniform air
discharge.
The new aerodynamic split condenser shroud design
improves airflow and reduces outdoor noise, providing
a more relaxing outdoor environment. The new split
design allows for easy access to the outdoor coil to
facilitate routine cleaning of the coil. The propeller-type
fan design allows for 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
provides air circulation. The fan motor requires no
maintenance and no lubrication.
PRODUCT FEATURES AND BENEFITS
(52P AND 52C)

7
NO-RUST WEATHER LAST™
WALL SLEEVE AND FRONT
PANEL
The indoor front panel and non-insulated 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 require-
ments of Underwriters’ Laboratories and resists dam-
age caused by impact and scratching. The Weather
Last feature also insulates and has up to 10 times the
acoustic absorption of metal cabinets.
Insulated polymer wall sleeves combine all of the
above features with the option of factory-installed
insulation. The insulation helps to reduce heat loss,
save energy and provides better sound absorption.
Carrier’s metal wall sleeves are available in a variety
of sizes for most standard and deep wall applications.
All metal wall sleeves come with factory-installed
insulation, designed to minimize heat loss and reduce
outdoor noise transmissions into the room.
REMOVABLE FRONT PANEL
The louvered front panel fits firmly onto the chassis
and features easy removal for service. It provides front
air intake to enhance performance and quiet operation.
It also allows the option of flush mounting PTAC unit
to the floor. If desired, the front panel can be
secured to the unit with field-supplied screws.
ANTI-THEFT KNOBS
The anti-theft knobs are captured underneath the front
panel of the unit to prevent the knobs from being
removed or stolen.
42”
16”
24”/26”/28”
TEMPERATURE MODE
OFF
LO
HI
COOL
FAN
HI
HEAT
COOLER
WARMER
LO
Removable Front Panel
Standard Wall Sleeve (Plastic or Metal)
Deep Wall Sleeve (Metal)
Anti-Theft Knobs

8
TWO-PIECE LIFETIME
INDOOR FILTER
New two-piece removable filters easily slide in and
out from the front of the PTAC unit and are inter-
changeable. The front panel does not need to be
removed to access or change the filters. The filters are
washable and permanent.
WASHABLE VENT AIR FILTER
The unique vent 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. A magnet on
the door and high-pressure airflow create a tight, draft-
free seal when the vent door is closed.
The vent will provide 50 CFM of fresh
air.
BI-DIRECTIONAL
DISCHARGE GRILLE
The discharge grille is constructed of durable polycar-
bonate and is reversible. Air flows upward at a
40 degree angle to the floor but can easily be adjusted
to an 80 degree angle to the floor.
PRODUCT FEATURES AND BENEFITS (cont)
80 DEGREE
AIR FLOW
40 DEGREE
AIR FLOW
Outdoor Vent Filter Location
Reversible Polycarbonate Discharge Grille
Two-Piece Indoor Filter

9
POWER CORD FOR 265-V
UNITS
A power cord is included for 265-v units. The power
cord is 18-in. long (cord extends 15-in. from bottom of
front panel) and per UL and National Electrical codes
must plug into an electrical subbase.
BI-MOLDED CONDENSER
SHROUD
The bi-molded condenser shroud provides easy access
for service and maintenance of the condenser coil and
related components.
SNOW BAFFLE
The snow baffle is provided to keep snow from blow-
ing into the intake and landing on the internal compo-
nents of the PTAC unit. Melted snow can form ice on
moving parts and cause damage to the unit.
Bi-Molded Condenser Shroud
BI-MOLDED
CONDENSER
SHROUD
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
265-V Unit with Power Cord
SNOW
BAFFLE
Snow Baffle

10
EASY ACCESS TO CHASSIS
Access to the chassis simply requires removing four
screws and then sliding the chassis out of the sleeve
for service.
HIDDEN CONTROLS
The factory-wired control box houses all control com-
ponents and is quickly accessible without removing
the chassis from the wall sleeve. By simply removing
two screws on control box, the hinged door lowers,
providing quick access to all the electrical compo-
nents. The wiring diagram is located on the front of the
control box door.
Temperature Limiter and Control
Knob
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 front panel on control box, out of the occupant’s
sight. Each setting 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 (providing full range for the occupant).
Outdoor Air Vent Control
Control of the outdoor-air vent is handled by a vent
handle located under the front panel on the left side of
the unit. This handle rotates to manually open and
close the outdoor vent.
The vent will provide 50 CFM of fresh
air.
Fan Cycle Switch
The fan cycle switch 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.
NOTE: On wall thermostat models, the fan cycle/
continuous feature is typically located at the wall ther-
mostat. This switch is then used for high/low fan speed
selection for wall thermostat models.
PRODUCT FEATURES AND BENEFITS (cont)
CHASSIS ATTACHMENT SCREWS
(SAME LOCATION ON OPPOSITE SIDE)
Easy Service Access