Carrier 52M Performance Series Operation manual

1
Product Data
52M PerformancetSeries
Packaged Terminal Air Conditioner / Heat Pump
7,000 --- 15,000 Btuh
A07228
TABLE OF CONTENTS
PAGE
QUICK SPECIFICATIONS 3..........................
APPLICATIONS 4--5.................................
New Construction 4................................
Retrofit Replacement 4.............................
Carrier Warranty 4.................................
Application Considerations 5........................
PRODUCT OVERVIEW 6.............................
PRODUCT FEATURES & BENEFITS 7--14..............
Quiet Operation 7.................................
Most Efficient Performance 7........................
Efficient Fan Motor 7...............................
No---Rust Weather LasttWall Sleeve & Front Panel 8...
Removable Front Panel 8...........................
Two---Piece Lifetime Indoor Filter 8...................
Washable Vent Filter 9.............................
Bi--- Directional Discharge Grille 9....................
Digital Keypad and Electronic Display 9...............
System Configuration 9............................
Wall Thermostat Interface 9.........................
Energy Management (EM) Interface 10...............
Power Cord for 265V Units 10.......................
Power Cord Protection for 230/208V Units 11..........
Bi---Molded Condenser Shroud 11...................
Easy Access Chassis 11............................
Enhanced Copper Tubing 12........................
Seamless Basepan 12.............................
Condensate Drain Valve 12.........................
Condensate Removal 12...........................
Heat Pumps Pay Their Way 13......................
Heat Pump Energy Savings 14......................
ORDERING DATA 15................................
Product Catalog Number 15........................
Required Accessory Power Cord Catalog Number 15...
FIELD INSTALLED ACCESSORIES 16--23..............
DIMENSIONAL DRAWINGS &
INSTALLATION DATA -- NEW CONSTRUCTION 24--28..
WALL THERMOSTAT CONNECTIONS 29..............
PERFORMANCE AND ELECTRICAL DATA 30--33......
TYPICAL WIRING SCHEMATIC
FOR EM INTERFACE 34.............................
TYPICAL WIRING SCHEMATIC FOR MULTIPLE PTAC
UNITS CONNECTED TO A SINGLE WALL TSTAT 35....
GUIDE SPECIFICATIONS 36--39.......................
ACCESSORIES 40...................................
PTAC LIMITED WARRANTY 41.......................

2
Valued Carrier Customer,
Carrier’s Product Data Manual has been specifically developed to make your product and
accessory selection easier and faster than ever. 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
complete line of Packaged Terminal Air Conditioning (PTAC) products. The Performanc
e
series (52M), whisper quiet model, is Carrier's quietest and most energy efficient PTAC
unit ever.
The Performance refrigerant system utilizes the highest efficiency compressors and coil
design to achieve maximum energy efficiency. The airflow system uses two fan motors
and an indoor tangential blower wheel for maximum comfort and superior sound. Choose
the 52M Performance series now and start recovering your investment immediately throu
g
energy savings, guest satisfaction 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
52M

3
QUICK SPECIFICATIONS
COOLING & ELECTRIC HEAT
MODEL NUMBER
Cooling
Capacity
(BTUH)
EER
Electrical
Heating Ca-
pacity
(BTUH)
Reverse
Cycle Heat
(BTUH)
COP Voltage
Range
Indoor CFM COOLING Approx.
Ship
Weight lb.
Low Med High AMPS WATTS
5 2 M E --- U 0 7 --- --- --- 3 --- ---
Determined
by your power
cord selection.
See chart be-
low.
--- ---
187 --- 253
--- --- --- --- --- ---
5 2 M E --- U 0 9 --- --- --- 3 8800 / 9000 11.4 / 11.4 --- --- 265 290 330 3.9 / 3.7 770 / 790 125 5 2 M E --- U 1 2 --- --- --- 3 12,000 / 12,100 11.4 / 11.5 --- --- 280 300 320 5/ 4.7 1060 / 1070 140 5 2 M E --- U 1 5 --- --- --- 3 --- --- --- --- --- --- --- --- --- --- 5 2 M E --- U 0 7 --- --- --- 4 --- --- --- ---
239---292
--- --- --- --- --- ---
5 2 M E --- U 0 9 --- --- --- 4 9,100 11.7 --- --- 265 300 320 3.3 790 125 5 2 M E --- U 1 2 --- --- --- 4 12,100 11.5 --- --- 280 310 345 4.35 1050 140 5 2 M E --- U 1 5 --- --- --- 4 --- --- --- --- --- --- --- --- --- ---
HEAT PUMPS
Model No.
Cooling
Capacity
(BTUH)
EER
Electrical
Heating Capa-
city (BTUH)
Reverse Cycle
Heat (BTUH) COP Voltage
Range
Indoor CFM COOLING Approx. Ship
Weight lb.
Low Med High AMPS WATTS
5 2 M Q --- U 0 7 --- --- --- 3 --- ---
Determined by
your power
cord selection.
See chart be-
low.
--- --- --- --- --- --- --- --- ---
5 2 M Q --- U 0 9 --- --- --- 3 8,800 / 9,000 10.5 / 10.5 8,300 / 8,350 3.4 / 3.3 187---253 270 320 350 4.1 / 3.9 840 860 125 5 2 M Q --- U 1 2 --- --- --- 3 12,000 / 12,000 11.1 / 11.1 10,700 / 10,900 3.4 / 3.3 187---253 280 320 350 5.1 / 4.8 1080 1090 140 5 2 M Q --- U 1 5 --- --- --- 3 --- --- --- --- --- --- --- --- --- --- --- 5 2 M Q --- U 0 7 --- --- --- 4 --- --- --- --- --- --- --- --- --- --- --- 5 2 M Q --- U 0 9 --- --- --- 4 9,000 10.9 8,400 3.5 239---292 275 285 300 3.2 825 125 5 2 M Q --- U 1 2 --- --- --- 4 11,400 10.8 10,600 3239---292 220 250 290 4.2 1,050 140 5 2 M Q --- U 1 5 --- --- --- 4 15,000 --- --- --- --- --- --- --- --- --- ---
POWER CORD SELECTION: 52M PTACs are not individually equipped with a power cord, so one must be ordered separately based on the voltage and amperage of your electrical circuit. If the unit is to be plugged into a receptacle, then a line cord connection kit needs to be selected. If it will be permanently connected, a hardwire connection must be used.
Model No. Voltage Receptacle Type Heating
(BTUH) Heater (Kw) Input Power
(Watts)
Current
(Amps)
Branch Circuit
Full Amps
PWRCORD--- 230V--- 15A
208/230V
15 amp /250V 7,800 / 6,400 2.5 2,393 / 1,985 10.4 / 9.5 15
PWRCORD--- 230V--- 20A 20 AMP / 250V 11,600 / 9,700 3.4 3,493 / 2,935 11.52 / 14.1 20 PWRCORD--- 230V--- 30A 30 AMP / 250V 17,000 / 13,600 5.0 5,170 / 4,147 22.5 / 20.0 30 PWRCORD--- 265V--- 15A
265V
15 AMP / 277V 7,800 2.5 2,396 9.2 15
PWRCORD--- 265V--- 20A 20 AMP / 277V 11,600 3.4 3,496 13.3 20 PWRCORD--- 265V--- 20A 30 AMP / 277V 17,000 5.0 5,170 19.6 30
NOTE: In compliance with UL, and the National Electrical Code, 265V units installed iwth a power cord require the use use of a 265V electrical subbase.
Always look for these symbols, the air conditioning industr
y
seals of certified
p
erformance, efficienc
y
and ca
p
acit
y
.
52M

APPLICATIONS
Whether you are designing a new structure or
replacing packaged terminal air conditioning units in
an existing building, Carrier will meet your needs.
SHotels and motels
SNursing homes and assisted living care
centers
SOffices
SApartments
SSingle--family dwellings
SHome conversions and residential add--ons
NEW CONSTRUCTION
The Carrier 52M Packaged Terminal Air
Conditioning (PTAC) unit is designed to meet the
needs of the architect, engineer, and contractor. For
unitinstallation,Carrier’sexpertsupport networkwill
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
SWhisper--quiet performance, indoors and out
SNo bulky duct system
SNo separate equipment room
SNo water towers or additional cooling
equipment
SNo complex match--up of different HVAC
components
SLess sensitivity to building orientation (sun,
wind, shade)
SOptional architectural grille to permit custom
exterior appearance
Initial Cost Savings for the Building Owner
SNo expensive component HVAC system
purchase
SNo equipment room or maintenance
engineering staff
STwo--part delivery to minimize on--site
damage
SWeather--protected wall sleeve that goes in
place during construction; chassis that slides
in place after construction
SNo seasonal changeover required for cooling
or heating -- units are self--contained comfort
systems
Lower Operating Costs and Reliable Comfort
for The Occupant
SHeat pump models offer substantial savings
over models with conventional electric
resistance heaters
SIndividual units allow tenants to choose the
degree of comfort and operating economy.
SRapid servicing reduces downtime: complete
chassis can be replaced in minutes without
disrupting other occupants.
SEach 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:
SReplace the existing wall sleeve with a
Carrier Weather Lasttsleeve. 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.
SUse an existing sleeve and exterior grille. The
Carrier 52M series PTAC will fit into:
— Most major competitors’ wall
sleeves/grilles, including GE, Amana,
Trane and Bryant, and NO accessory
retrofit kit is required.
— Replacing older Carrier PTAC
products, 52P, 52C, 52S and Carrier
52B, and NO accessory retrofit kit is
required.
— Friedrich T series and ZoneAire wall
sleeves, with a required wall sleeve
extension (see accessory Friedrich
Retrofit Wall Sleeve Adapter).
IMPORTANT: All non--Carrier sleeve or exterior
grille retrofit applications need prior approval
from Carrier. Please contact your Carrier
representative for assistance.
CARRIER WARRANTY
Carrier’s five--year limited warranty is the most
comprehensive in the industry. Carrier provides:
SFull coverage for parts and labor for first
year.
SFour additional years of full coverage on
sealed refrigeration system.
SLimited second through fifth year coverage
on non--refrigeration system parts.
52M

5
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
orderto achievethe 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
temperature 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 temperature too quickly.
The unit will cycle on and off, however,
dehumidification 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
associated with undersizing or oversizing a PTAC
unit. This can be the cause of insufficient cooling,
dehumidification, or heating. Sources of air
infiltration include vents, gaps around windows and
doors, and improperly sealed floors, ceilings or wall
joints.
52M

6
PRODUCT OVERVIEW (52M)
This section summarizes product features covered in detail in later sections of this manual.
FRONT
PANEL
INDOOR
COIL
BASEPAN
DISCHARGE
GRILLE
WIRE SCREEN
BI-MOLDED
CONDENSER
SHROUD
COIL TUBE
SHEETS
INDOOR-AIR
FILTERS
ACCESSORY
WALL
SLEEVE
ACCESSORY
OUTDOOR
GRILLE
DIGITAL CONTROL PAD
W/ELECTRONIC DISPLAY
WALL THERMOSTAT
AND ENERGY MANAGEMENT
INTERFACE
CONFIGURATION
DIP SWITCHES
Accessory Power Cord
SAccessory Power Cord or Hardwire Kit
(required) -- Select correct power cord or
hardwire kit to match voltage and amperage of
electrical circuit.
SPolymer, Metal or Extended Wall Sleeve --
Designed for rugged duty, acoustic absorption,
and attractive appearance for years to come.
SRotary Compressors -- Provide quiet, reliable
operation.
SCopper Tube Aluminum Fin Coils -- Enhanced
coils provide durability, high performance, and
ease of operation.
SFresh Air Control Arm -- Allows outdoor air into
room through vent filter for improved air quality.
SControl Door -- Provides protection for controls
and enhances appearance.
SImproved Condensate Removal -- Minimizes
condensate water on outside of building.
SNew Two--Piece Filter Design -- Provides
improved air filtration and can be removed easily
for cleaning.
SLouvered Front Panel -- Made of high impact
polystyrene. Provides improved performance and
quiet operation.
SBi--Molded Condenser Shroud -- T h e t w o -- p i e c e
condenser shroud allows easy access for service
and maintenance to the outdoor coil and other
components.
SDigital Control Pad with Electronic Display --
Easy to select: mode, fan speed and set point with
an easy to read electronic display. In _For_C.
SConfiguration Dipswitches -- Setup the system
perfect for the exact application.
SWall Thermostat Interface -- A terminal block
for wiring up a wall thermostat that is easy to wire
to and is easy to remove.
SEM (Energy Management) Interface -- A p l u g
for tying to an Energy Management system or
Front Desk Control. Easy to wire to and easy to
remove.
52M

7
PRODUCT FEATURES AND BENEFITS (52M)
SImproved sound for quiet operation
SExceeds ARI (Air Conditioning and Refrigeration
Institute) minimum efficiency requirements with
exceptional energy efficiency ratios (EERs)
SEasy to operate digital keypad
SEasy to see electronic display
SWall thermostat interface standard
SEnergy Management interface standard
SEasy configuration for most applications
SEnhanced temperature and humidity control
SSelf check/Self Correct features
SImproved condensate removal system
SAttractive, durable cabinet featuring new design
SChassis that easily retrofits to most major
competitors’ sleeves without use of retrofit kit
SLow operating costs
SNo bulky duct system
SNo seasonal changeover
QUIET OPERATION
Occupants and neighbors are protected against noise
intrusion. Indoor sound reduction is achieved
through the units’ two--fan motor and tangential fan
design that provides a smooth, uniform air discharge.
Outdoors, the rotary compressor provides quiet,
reliable 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) indoor fan motor provides achoice of high,
medium or low speeds for heating and cooling. A
fan--only setting provides air circulation. The fan
motors, both indoor and outdoor, require no
maintenance and no lubrication.
52M

8
NO--RUST WEATHER LASTt
WALL SLEEVE AND FRONT PANEL
The indoor front panel and polymer 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.
Insulated polymer wall sleeves combine all of the
above features with factory-installed insulation. The
insulation helps to reduce heat loss, save energy,
provide better sound absorption, and reduce the risk
of sleeve sweating.
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.
A07
633
Standard Wall Sleeve (Polymer)
A07
42 in.
16 in.
Available in:
14-3/4 in.,
18 in.,
24 in.,
26 in.,
28 in.
Standard and Deep Wall Sleeve (Metal)
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.
A07
381
Front Panel
TWO--PIECE LIFETIME INDOOR
FILTER
New two--piece removable filters easily slide in and
out from the front of the PTAC unit and are
interchangeable. The front panel does not need to be
removed to access or change the filters. The filters are
washable and permanent.
2 Air filters
A07
381
Two--Piece Indoor Filter
52M

9
OUTDOOR AIR VENTILATION
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 non corrosive 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 up to 65 cfm of fresh air.
NOTE: If more fresh air cfm is required, a
Power--Vent Kit is available (see accessories).
A07550
Outdoor Air Ventilation
BI--DIRECTIONAL DISCHARGE
GRILLE
The discharge grille is constructed of durable
polycarbonate 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.
Air discharge upward
Air discharge outward (Default)
A07550
Reversible Polycarbonate Discharge Grille
DIGITAL KEYPAD AND
ELECTRONIC DISPLAY
The digital keypad provides a simple to operate
control. The large, easy to press, “On/Off”, “Fan
Speed”, “Mode”, “Setpoint Up” and “Setpoint Down“
buttons make the control easy to operate. LEDs are
used to show the operating conditions selected.
Large numbers are used to display the Setpoint, and if
configured, room air temperature.
A07632
Electronic Display
SYSTEM CONFIGURATION
There are many different configuration possibilities,
through both dipswitches and the digital keypad, that
allow you to configure the unit for your exact
application. See Owner’s Manual for more detailed
information.
Electric heat only (for Heat Pumps
)
Wall Thermostat enable
Fan CON/CYC for heating
Fan CON/CYC for cooling
Setpoint Limit 1
Setpoint Limit 2
Freeze guard
Dipswitch
UP
Down
A07072
Dipswitches
52M

10
WALL THERMOSTAT INTERFACE
The standard wall thermostat interface provides a
simple to install thermostat connection. The unit has
a removable terminal connector to make field wiring
easy. See more info on wall thermostat connections
in the Dimensional Drawings and Installation Data
Section.
Notes:
— Thermostat wire is field supplied and
recommended wire size is 18 to 20 gage
solid thermostat wire.
— Wire should never be routed through the
wall sleeve.
— It is recommended to include extra wires
in case a wire breaks or is cut during
installation.
— The thermostat is ordered separately and
a Carrier PTAC approved thermostat is
recommended, see the accessory chart in
the back.
EM (ENERGY MANAGEMENT)
INTERFACE
The EM interface is standard and provides a simple to
install, Energy Management connection. The unit has
a removable terminal connector to make field wiring
easy. When 24VAC is supplied to the input (the EM
connection), the unit will turn off. Once the 24VAC is
removed (becomes 0 volts), the unit will turn back
on.
Note: For more info, see the section in the back,
Typical Wiring Schematic For Energy
Management Interface.
Wall Thermostat
Terminal Connections
Energy Management
Terminal Connections
A07634
Wall Thermostat and Energy Management
Interface
POWER CORD FOR 265V UNITS
The 265v power cord extends 15--in. from bottom of
front panel and, per UL and National Electric Codes
(NEC), must plug into an electrical subbase.
Note: Accessory power cord and electrical
subbase sold separately. (See Accessory section
in back of this document.)
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
A07635
265V Power Cord
52M

11
POWER CORD PROTECTION FOR
230/208V UNITS
The power cord for the 230/208--v unit provides
power cord protection by automatically
disconnecting power during an unsafe condition.
Power can be restored by pressing the RESET button.
A07551
Power cord Plug Head
BI--MOLDED CONDENSER SHROUD
The bi--molded condenser shroud provides easy
access for service and maintenance of the condenser
coil and related components.
BI-MOLDED
CONDENSER
SHROUD
A07677
Bi -- Molded Condenser Shroud
EASY ACCESS TO CHASSIS
Access to the chassis simply requires removing front
panel, then four easy to access screws and then
sliding the chassis out of the sleeve for service or
maintenance.
A07057
Easy to Access Chassis
52M

12
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:
Sheat transfer capability
Sthe efficiency of the cooling and heating
processes
Sthermal conductivity (by creating additional
tube surface and turbulent refrigerant gas
flow)
Every Carrier PTAC coil undergoes thorough leak
testing and pressure testing.
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 1--3/4 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.
A07552
CONDENSATE DRAIN VALVE
The temperature--activated drain valve opens when
the outdoor temperature drops below 55_F to prevent
water from freezing in the basepan.
A07550
Condensate Drain Valve Prevents Water
from Freezing in Basepan
CONDENSATE REMOVAL
Carrier’s 52M Series unit has a new condensate
(water) disposal system. In addition to slinger ring
technology, Carrier has developed and patented a
Condensate Suction Port. The suction port, along
with the slinger ring, draws in water which is sprayed
up onto the outdoor coil. The water then evaporates,
thus providing better disposal of excess condensate
and improving unit efficiency.
NOTE: If it is necessary to control 100% of the
condensate, the Carrier Drain Kit (Part No.:
DRAIN--KIT--4PK) is recommended.
SLINGER
RING
CONDENSER SECTION
CONDENSATION
SUCTION PORT
A07678
Condensate Removal System
52M

13
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 or below for one minute. The
thermostat switches the unit back to heat pump mode
when the outdoor coil temperature rises above 40_F
for ten minutes, 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 functions 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 cooling position.
Manual Compressor Override Configuration:
This configuration dip switch completely locks out
the compressor. Note that the compressor and heater
do not operate at the same time, thus conserving
energy.
HOW THE HEAT PUMP WORKS
A07553
In Hot Weather:
Carrier’s PTAC 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 efficiency design saves energy and reduces
cooling costs.
A07553
In Cool Weather:
When the outdoor coil temperature is above 28_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.
A07554
In Sub-Freezing Weather:
When the outdoor coil temperature falls below 28_F
for one minute, the unit automatically switches on a
built--in electric heater. The compressor stops and the
indoor fan circulates warm air produced by the heater.
When the outdoor coil temperature rises above 40_F
for ten minutes, heat pump operation resumes
automatically.
52M

14
HEAT PUMP ENERGY
SAVINGS
Heat pumps save more on operating 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 approximates your local rate. The
approximated 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.
For more precise energy savings in your geographical
location, go to www.lodgingAC.com to use Carrier’s
energy calculator.
ZONE V
ZONE IV
ZONE III
II
ZONE I
V
ZONE
VI
ZONE II
A07555
CARRIER HEAT PUMP INITIAL COST VERSUS SAVINGS OVER HEAT/COOL MODELS
ZONE ELECTRIC
COST/kWH
7000 BTUH1
COOLING
CAPACITY
$60
PREMIUM
9000 BTUH2
COOLING
CAPACITY
$75
PREMIUM
12000 BTUH2
COOLING
CAPACITY
$90
PREMIUM
15000 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
$.08
$.10
$ 34.26
$ 45.68
$ 57.10
21
16
13
$ 43.08
$ 57.44
$ 71.80
21
16
13
$ 58.20
$ 77.60
$ 97.00
19
14
11
$ 68.34
$ 91.12
$113.90
19
14
12
II
$.06
$.08
$.10
$ 57.12
$ 76.16
$ 95.20
13
9
8
$ 71.76
$ 95.68
$119.60
13
9
8
$ 96.96
$129.28
$161.60
11
8
7
$113.64
$151.52
$189.40
12
9
7
III
$.06
$.08
$.10
$ 58.02
$ 77.36
$ 96.70
12
9
7
$ 72.84
$ 97.12
$121.40
12
9
7
$ 98.40
$131.20
$164.00
11
8
7
$115.38
$153.84
$192.30
11
9
7
IV
$.06
$.08
$.10
$.12
$.14
$.16
$ 82.02
$109.36
$136.70
$164.04
$191.38
$218.72
9
7
5
4
4
3
$103.02
$137.36
$171.70
$206.04
$240.38
$274.72
9
7
5
4
4
3
$139.14
$185.52
$231.90
$278.28
$324.66
$371.04
8
6
5
4
3
3
$163.14
$217.52
$271.90
$326.28
$380.66
$435.04
8
6
5
4
3
3
V
$.06
$.08
$.10
$.12
$.14
$ 57.36
$ 76.48
$ 95.60
$114.72
$133.84
13
9
8
6
5
$ 71.94
$ 95.92
$119.90
$143.88
$167.86
13
9
8
6
5
$ 97.26
$129.68
$162.10
$194.52
$272.33
11
8
7
6
4
$113.94
$151.92
$189.90
$227.88
$265.86
12
9
7
6
5
VI
$.06
$.08
$.10
$.12
$ 93.72
$124.96
$156.20
$187.44
8
6
5
4
$117.66
$156.88
$196.10
$235.32
8
6
5
4
$159.00
$212.00
$265.00
$318.00
7
5
4
3
$186.48
$248.64
$310.80
$372.96
7
5
4
4
LEGEND
kWH --- K i l o w a t t H o u r
* Computer projections based on full cooling load at 95 F. Savings projected for 230 v ratings.
1 Heating load is 5,000 Btuh at winter design point temperature.
2 Heating load is 10,000 Btuh at winter design point temperature.
3 Heating load is 15,000 Btuh at winter design point temperature.
For more precise energy savings in your geographical location, go to www.lodgingAC.com to use
Carrier’s energy calculator.
52M

15
ORDERING DATA
For immediate assistance, call 1--800--827--7435 or contact your local Carrier dealer.
Standard Unit
SChassis with front panel
SElectronic controls with touchpad and digital display
Lead--time: Many models are in stock for immediate delivery; call for lead--times.
FRONT
PANEL
INDOOR
COIL
BASEPAN
DISCHARGE
GRILLE
WIRE SCREEN
BI-MOLDED
CONDENSER
SHROUD
COIL TUBE
SHEETS
INDOOR-AIR
FILTERS
ACCESSORY
WALL
SLEEVE
ACCESSORY
OUTDOOR
GRILLE
DIGITAL CONTROL PAD
W/ELECTRONIC DISPLAY
WALL THERMOSTAT
AND ENERGY MANAGEMENT
INTERFACE
CONFIGURATION
DIP SWITCHES
A06752
PRODUCT CATALOG NUMBER
Electrical Data
3 – 230/208-v, 60 Hz
4 – 265-v, 60 Hz
Cooling Capacity (nominal)
07 – 7,000 Btuh
09 – 9,000 Btuh
12 – 12,000 Btuh
15 – 15,000 Btuh
52 ME – U 12 – – – 3
Series Designation
PTAC (Packaged Terminal Air Conditioner)
Electric Heater Size
U – Universal (defined by power cord)
Performance Series
ME – Cooling with Electric Heat
MQ – Heat Pump
ACCESSORY POWER CORD (REQUIRED) CATALOG NUMBER
A07636
Amperage
15A = 15 Amps
20A = 20 Amps
30A = 30 Amps
PWRCORD –
230v
Kit Description
PWRCORD = Power Cord
Voltage
– 20A
230v = 230/208-v, 60 Hz
265v = 265-v, 60 Hz
A07637
*Power Cord
for 230v*
*Power Cord
for 265v
52M

16
FIELD--INSTALLED ACCESSORIES
WALL SLEEVES
Weather LasttWall Sleeve
For the best performance and longest life, Carrier
recommends genuine Carrier wall sleeves for all
installations.
All Carrier wall sleeves are built with a pitch of 1/4
in. per foot; for self--pitching of the unit, the wall
sleeve must be installed level (any error should be
pitched to the outside). Overflow slots on the outside
of the sleeve are in place to divert excess water
during severe weather.
Important Sleeve Installation Considerations:
SAll Carrier sleeves are self pitching and must
be mounted level in all directions. (Do not use
rails to level sleeve.)
SThe sleeve should be caulked on all sides,
including both inside and outside the
building.
SIf more than 4 in. of wall sleeve projects into
the room, an accessory subbase must be used
for support.
SFor all applications with an accessory
subbase, wall sleeve must extend 3--1/4 in.
minimum into room and must be 3--1/4 in.
minimum to 5--1/2 in. maximum above floor
(including carpeting) to allow for proper fit of
subbase.
SFor applications where the wall sleeve is
mounted flush to the exterior of the
building(or recessed in), Carrier recommends
a field--supplied drip edge be installed to
prevent water infiltration into the building.
SInsulated wall sleeves should be considered
for superior sound absorption, to reduce heat
loss and to prevent sleeve sweating, a
condition that can occur when the outside
temperature is cold and the indoor conditions
are warm and humid.
Polymer Wall Sleeves
Choose a polymer wall sleeve for maximum
protection and appearance.
All Carrier’s polymer wall sleeves are made from a
molded polymer that is designed for strength and
durability. This material has excellent corrosion
resistance and a flammability rating of UL94--5V.
The sleeve surface is textured to prevent shine and
hide scratches. The rib configuration on the sleeve
bottom allows easy chassis removal and aids in
drainage. The locating holes in the side and top
panels allow for easy fastening of the sleeve to wall
openings. Refer to dimension drawings for typical
wall installation and dimensions.
The sleeve’s alpine mist color (a shade of beige)
closely matches the front panel and blends in well
with any inside or outside decor.
The polymer wall sleeve comes in both insulated
(factory installed) or non--insulated, to meet the
requirements of every application.
Insulated Polymer Wall Sleeve
Part No.: SLEEVE--INSUL--1PK
Carrier’s accessory insulated polymer wall sleeve,
with factory--installed insulation, provides superior
sound absorption, reduces heat loss and prevents
sleeve sweating, a condition that can occur when the
outside temperature is cold and the indoor conditions
are warm and humid.
IMPORTANT: Insulated Polymer Wall sleeve
provides superior sound absorption, reduces
heat loss and prevents sleeve sweating.
A07633
Corrosion--Protected Polymer Sleeve
Non--Insulated Polymer Wall Sleeve
Part No.: WALL--SLEEVE--1PK
Carrier’s accessory non--insulated polymer wall
sleeve provides a superior appearance and protection
for many applications.
For applications where weather conditions
could influence sleeve sweating, a condition
that can occur when the outside temperature is
cold and the indoor conditions are warm and
humid, the Insulated Polymer Wall sleeve
should be considered.
52M

17
FIELD--INSTALLED ACCESSORIES (CONT.)
Insulated Metal Wall Sleeves
Part No.: SLEEVE--STEEL--1PK
Part No.: SLEEVE--EXT18--1PK
Part No.: SLEEVE--EXT24--1PK
Part No.: SLEEVE--EXT26--1PK
Part No.: SLEEVE--EXT28--1PK
Carrier’s metal wall sleeves are available in a variety
of sizes for most applications and difficult
installations. Choose from 14--3/4 in., 18 in., 24 in.,
26 in., or 28 in. standard depth sizes. All metal wall
sleeves come with factory--installed insulation,
designed to minimize heat loss, reduce outdoor noise
transmissions into the room and prevent sleeve
sweating. In addition, the metal wall sleeve provides
a flammability rating higher than UL94--5V.
A07
42 in.
16 in.
Available in:
14-3/4 in.,
18 in.,
24 in.,
26 in.,
28 in.
Standard and Extended Metal Wall Sleeve
Wall Sleeve Molding Kit
Part No.: SLEEVE--MOLDING
For a superior look and to hide any construction
imperfections, use Carrier’s wall sleeve molding kit
to trim the wall sleeve to the wall. The molding kit is
a perfect solution and can be used with any Carrier
wall sleeve (matches Carrier wall sleeve color).
1/2 IN.
1 IN.
Wall Sleeve Molding Kit
Friedrich (and ZoneAire) Retrofit Wall Sleeve
Adapter
Part No.: FR--SLEEVE--EXT
The Friedrich (and ZoneAire) wall sleeve adapter is
constructed of sheet metal and is designed to increase
the depth of an existing Friedrich T--series or
ZoneAire wall sleeve to accommodate Carrier’s
industry standard PTAC units.
42 IN.
16 IN.
3 IN.
Friedrich Wall Sleeve Adapter Kit
Climate Master Wall Sleeve Adapter
Part No.: CM--SLEEVE--EXT
The Climate Master wall sleeveadapter isconstructed
of sheet metal and is designed to increase the depth of
an existing Climate Master 12--1/2 in. wall sleeve to
accommodateCarrier’sindustrystandardPTACunits.
42 IN.
16 IN.
1 1/2 IN.
Climate Master Wall Sleeve Adapter Kit
52M

18
FIELD--INSTALLED ACCESSORIES (CONT.)
OUTDOOR GRILLES
Carrier recommends only the use of Carrier--supplied
grilles for use on the 52M series units. However, the
architectural designs of a building may dictate the use
of special or oversized grilles and/or louvers. Special
louvers or any special architectural treatment of the
building facade that may restrict free circulation of
condenser airflow should be referred to Carrier
Corporation for evaluation and approval.
Aluminum Architectural
Outdoor Grilles (Louvered)
Part No.: GRILLE--ALU--CLEAR (anodized aluminum)
Part No.: GRILLE--ALU--WHITE
Part No.: GRILLE--ALU--BEIGE
Part No.: GRILLE--ALU--ALPIN (color matches Carrier
wall sleeve)
Part No.: GRILLE--ALU--BRONZ
Part No.: GRILLE--ALU--MBRNZ
Part No.: GRILLE--ALU--BROWN
Part No.: GRILLE--ALU--LGREY
Part No.: GRILLE--ALU--SGREY
Part No.: GRILLE--ALU--PEACH
Part No.: GRILLE--ALU--MELON
Part No.: GRILLE--ALU--RDBRK
Part No.: GRILLE--ALU--BLUE
Part No.: GRILLE--ALU--GREEN
This premium line of decorative outdoor grilles will
enhance the appearance of any building. The grilles
are made of strong, durable, extruded, anodized
aluminum and are designed to be mounted easily
from inside the room. These elegant grilles, available
in many standard colors, have baked enamel finishes
containing 50% Kynarrresin, for a superior finish
that will withstand the most extreme conditions.
Polymeric Architectural Outdoor Grilles
(Louvered)
Part No.: GRILLE--PLA--BROWN
Part No.: GRILLE--PLA--BEIGE
Part No.: GRILLE--PLA--ALPIN
(color matches Carrier wall sleeve)
This value line of polymeric architectural outdoor
grilles will blend attractively with most building
exteriors. Mounted easily from inside the room, the
one--piece, molded grille is designed for protection,
enhanced appearance, and superior
weather--resistance. The grille is made of durable
polymer and has a colorfast, lightly textured finish
that blends well with most exterior finishes.
Architectural Grille in
Aluminum or Polymeric
NOTE: Color samples can be ordered in packs of 10
through your Carrier Sales Representative.
(Distributors: order part number 02--CLRGR001--10
through Literature Distribution).
For more information on custom colors and sizes,
contact Reliable Products at 1--800--239--4621
Standard Outdoor Aluminum Grille
Part No.: GRILLE--ALU--STAMP
This cost--effective, one--piece standard grille is made
from durable anodized aluminum. The grille is
lightweight, has a clear finish, and is easy to install
from inside the room.
Standard Grille
52M

19
FIELD--INSTALLED ACCESSORIES (CONT.)
OUTDOOR GRILLE SELECTION
IMPORTANT: If you wish to use a grille not made
by Carrier for your Carrier unit(s), contact
Carrier Application Engineering.
The following guidelines must be followed in the
initial selection of any alternate exterior grille or
louver:
1. The louver must have a minimum of 65% free
area. Free area is the minimum area of the
opening in an air inlet or outlet in which air can
pass. Free Area (%) = X/Y.
2. The louver should be attached to the wall sleeve
in a manner that will prevent recirculation of
condenser discharge air into the inlet. In most
applications, baffles, splitters, and/or gasket
will be required between the chassis tube end
sheets and the louver to prevent air
recirculation.
The above criteria must be followed, since a louver
that is restrictive or allows re--circulation will result
in a reduction of the unit’s capacity and efficiency
and will ultimately shorten the compressor life.
X
Y
X
YX
YX
Y
Louver Dimensional Reference
Sample Calculations
Free Area (%) = xx 100
y
x = 1
y = 1.5
F.A. (%) = 1x 100 = 66.7%
1.5
Hardwire Kit
Part No.: 52M--HDWR--KIT--15A
52M--HDWR--KIT--20A
52M--HDWR--KIT--30A
This accessory hardwire kit provides a permanent
connection to the unit. Electrical hard wiring is
required when NEC (National Electrical Code) or
local codes restrict the use of power cord and plug
connections. The hardwire kit easily mounts on the
front right side of the unit and comes with 36 inches
of flexible steel conduit.
A07381
Hardwire Kit
Conduit Interface Kit
Part No.: 52M--CONINT--15A
52M--CONINT--20A
52M--CONINT--30A
The conduit interface accessory kit provides an easy
wire connection to the unit to interface to existing
field--supplied conduit.
A07810
Conduit Interface Kit
52M

20
FIELD--INSTALLED ACCESSORIES (CONT.)
SUBBASE
Part No.: SUBBASE--230V--15A
Part No.: SUBBASE--230V--20A
Part No.: SUBBASE--230V--30A
Part No.: SUBBASE--265V--15A
Part No.: SUBBASE--265V--20A
Part No.: SUBBASE--265V--30A
Part No.: SUBBASE--NON--ELEC
Part No.: LEVELING--LEGS
This decorative subbase supports the unit and is
available in three basic models: non--electrical,
electrical, and hardwired.
A subbase (or leveling legs) is required for
installations where the wall sleeve extends 4 or more
inches into the room or the wall is less than 2 in.
thick. The minimum clearance between the bottom of
the sleeve and the floor is 3--1/4 in., and the
maximum clearance is 5--1/2 inches.
IMPORTANT: All standard cord--connected
265--v PTAC units will require a
field--installed electrical subbase accessory
per UL and NEC electrical codes.
All subbase models are pre--assembled, mount to the
wall sleeve, and come with adjustable legs and side
skirting to provide a finished appearance.
Non- Electrical Subbase
The easy to install, non--electrical subbase provides
mechanical support and requires no wiring.
Non--Electrical Subbase Assembly
Electrical Subbase
The electrical subbase has a factory--installed
electrical junction box containing a receptacle for
corded packaged terminal air conditioner (PTAC)
units. The electrical subbase series offers models
from 230--v, 15 amp up to 265--v, 30 amp. Knockouts
are provided for power source connections. Electrical Subbase Assembly
52M