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

2
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

3
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.

4
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.

5
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

6
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

7
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

8
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

9
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.

10
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
II
$.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
IV
$.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
V
$.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
VI
$.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
II
ZONE I
V
ZONE
VI
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.