The 38CKS Air Conditioner is
designed for superior performance
durability in harsh environments. The
product achieves up to 9.8 EER ratings
when used with manufacturer specified
components. The product is available in
seven standard nominal sizes ranging
from 018 to 060 for residential and light
commercial applications. All models
are listed with UL (U.S. and Canada).
AVAILABLE OPTIONS
ArmorPlate Condenser Coil—The
outdoor coil lasts three times longer
than other standard condenser coils
by utilizing a special ArmorPlate
protective coating on the coil.
Heavy Duty Inlet Grille—The
WeatherArmor™ coil protector, made
of a coated steel wire grid with
vertical 3/8 in. (9.5 mm) spacing, is
designed to help protect the coil from
inclement weather, vandalism, and
incidental damage. It provides
protection while not restricting
airflow and maintaining ease of coil
inspection and cleaning.
Cabinet Protection—Provides
superior durability through added
paint coverage on all sheet metal
components. The cabinet is
constructed with galvanized,
prepainted steel, providing each unit
with a finish that will last for many
years. Additional attention to detail,
such as the motor cap, protects the fan
motor from exposure to the elements.
Coil isolators protect the unit from
internal scratches during installation
and shipping. All screws on cabinet
exterior are coated for a long-lasting
rust-resistance.
Copyright 2005 Carrier CorporationForm 38CKS-5PD
Page 2
Model
Money Saving Operation—
Investment protection through long
lasting components in harsh
conditions.
Electrical Range—All model sizes
are offered in single phase 208-230
volt.
Unit Design—Copper tube, wavy
aluminum fin coil is designed for
optimum heat transfer. Vertical air
discharge carries sound and hot
condenser air up and away from
adjacent patio areas and foliage. Heat
pump style drain pan allows for easy
removal of water, dirt, and debris.
Totally Enclosed Fan Motor—
Provides greater reliability under
adverse conditions and dependable
performance for many years. The
permanent split-capacitor type motor
was designed for optimum efficiency.
Then, under extreme conditions, the
motor was tested and qualified to help
ensure the greatest reliability.
External Service Valves—Both brass
service valves are front seating, with
provision for field sweat connections.
Valves are externally located for quick
and easy refrigerant tube connections.
Each valve provides service ports for
ease in checking operating refrigerant
pressures.
ISO 9001:2000
REGISTERED
Easy Serviceability—One access
panel provides access to electrical
controls and compressor. Removal of
wire dome gives access to fan motor
and removal of the top gives access to
the coil.
Compressor Protection— Each
compressor is protected with internal
temperature and current sensitive
overloads.
Operating Range— Minimum
outdoor operating ambient in cooling
mode is 55ºF (12.8ºC), maximum is
125ºF (51.7ºC).
The data in this publication is displayed for all series; however, every series may not be available from manufacturer.
2
Series
Electrical
3 — 208-230-1
Page 3
52
59
67
73
82
82
90
Physical data
UNIT SIZE018-3A024-3A 030-3A036-3A042-3A 048-3A060-3A
OPERATING WT (Lb/Kg)
COMPRESSOR—Type
REFRIGERANT
Control
Charge (Lb/Kg) @ 15 Ft (4.6 m)
COND FAN
Air Discharge
Air Qty (CFM/L/S)
Motor HP
Motor RPM
COND COIL
Face Area (Sq Ft/m
Fins per In./Fins per cm
Rows
Circuits
VALVE CONNECTION (In./mm ID)
Vapor
Liquid
REFRIG TUBES* (In./mm OD)
Vapor (0–50 Ft/0-15.24m Tube
Length)
Vapor (Max Diameter for
Long-Line Applications)
Liquid (0–50/0-15.24m Ft Tube
Length)
Liquid (For Long-Line
Applications)
2
)
* For tubing sets between 50 (15.24m) and 175 ft (53.34m) horizontal and/or 20 ft (6.1m) vertical differential, consult Residential Split Systems LongLine Application Guideline.
NOTE: See unit Installation Instructions for proper installation.
Thermidistat Control, Programmable/Non-Programmable Thermostat with Humidity Control
Thermostat, Auto Changeover, 7-Day Programmable, °F/°C, 1-Stage Heat, 1-Stage Cool
Thermostat, Auto Changeover, Non-Programmable, °F/°C, 1-Stage Heat, 1-Stage Cool
Builder’s Thermostat, Manual Changeover, Non-Programmable, °F/°C, 1-Stage Heat, 1-Stage Cool
Outdoor Air Temperature Sensor
Backplate for Non-Programmable Thermostat
Backplate for Programmable Thermostat
Backplate for Builder’s Thermostat
Thermostat Conversion Kit (4 to 5 wire) — 10 Pack
Accessory usage guideline
REQUIRED FOR
LOW-AMBIENT
ACCESSORY
Crankcase Heater
Evaporator Freeze Thermostat
Winter Start Control
Accumulator
Compressor Start Assist
Capacitor and Relay
MotorMaster®—Low-Ambient
or Low-Ambient Pressure Switch
* For tubing line sets between 50 (15.24m) and 175 ft (53.34m) and/or 20 ft (6.1m) vertical differential, refer to Residential Split Systems Long-Line
Application Guideline.
† Only when low-pressure switch is used.
‡ Required for Low-Ambient Controller MotorMaster® Control only.
Controller
Wind Baffle
Coastal Filter
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
Ball Bearing Fan Motor
APPLICATIONS
(Below 55°F)
YesYesNo
Ye sN oN o
Yes†NoNo
NoNoNo
YesYesNo
Ye sN oN o
See Low-Ambient
InstructionsNoNo
NoNoNo
No
Yes‡NoNo
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(Over 50 Ft)
See
Long-Line
Application GuidelineNo
REQUIRED FOR
SEA COAST
APPLICATIONS
(Within 2 Miles)
Accessory description and usage (Listed alphabetically)
Ball-Bearing Fan Motor
A fan motor with ball bearings, which permits speed reduction while maintaining bearing lubrication.
Usage Guideline:
Coastal Filter
A mesh screen inserted under the top cover and inside the base pan to protect the condenser coil from salt damage without restricting airflow.
Compressor Start Assist – Capacitor and Relay
Start capacitor and relay gives a "hard" boost to compressor motor at each start up.
Usage Guideline:
Compressor Start Assist – PTC Type
Solid-state electrical device which gives a "soft" boost to the compressor motor at each start up.
Usage Guideline:
Required on all units when MotorMaster®—Low-Ambient Controller is installed.
Required for reciprocating
Long line
Low ambient
Hard shut off expansion valve on indoor coil
Liquid line solenoid on indoor coil
Required for scroll
Long line
Low ambient
Suggested for all compressors in areas with a history of low voltage problems.
Suggested when compressor power supply is marginal
Suggested in reciprocating compressor applications with rapid pressure balance (RPB) expansion valve on indoor coil.
compressors in the following applications:
compressors in the following applications:
5
Page 6
Accessory description and usage (continued)
5.
6.
7.
8.
9.
Crankcase Heater
An electric resistance heater which mounts to the base of the compressor to keep the lubricant warm during off cycles. Improves compressor lubrication on
restart and minimizes the chance of liquid slugging.
Usage Guideline:
Evaporator Freeze Thermostat
An SPST temperature-actuated switch that stops unit operation when evaporator reaches freeze-up conditions.
Usage Guideline:
Filter Drier—Bi-Flow
A device for removing contaminants from refrigerant circulating in an air conditioning system: single-direction flow.
Usage Guideline:
High-Pressure Switch
Auto reset SPST switch activated by refrigerant pressure on high side of refrigerant circuit. Cycles compressor off if refrigerant pressure rises to 426 ± 10 psig
and resets at 320 ± 20 psig. Provides protection against compressor damage due to loss of outdoor airflow.
Usage Guideline:
Liquid-Line Solenoid Valve (LLS)
This device serves two purposes. It is an electrically operated shutoff valve which stops and starts refrigerant liquid flow in response to compressor operation.
It maintains a column of refrigerant liquid ready for action at next compressor operation cycle. It also provides system protection against off-cycle refrigerant
migration.
NOTE:
Usage Guideline:
10.Low-Ambient Pressure Switch
A long life pressure switch which is mounted to outdoor unit service valve. It is designed to cycle the outdoor fan motor in order to maintain head pressure
within normal operating limits (approximately 100 psig to 225 psig). The control will maintain working head pressure at low-ambient temperatures down to 0°F
(–17.8°C) when properly installed.
Usage Guideline:
11.MotorMaster®-Low-Ambient Controller
A fan speed control device activated by a temperature sensor, designed to control condenser fan motor speed in response to the saturated, condensing temperature
during operation in cooling mode only. For outdoor temperatures down to –20°F (–28.9°C), it maintains condensing temperature at 100°F ± 10°F (37.8°C ± –
12°C).
Usage Guideline:
12.Outdoor Air Temperature Sensor
Designed for use with Carrier Thermostats listed in this publication. The device enables the thermostat to display the outdoor temperature. This device also is
required to enable special thermostat features such as auxiliary heat lock out.
Usage Guideline:
13.Sound Hood
Wraparound sound reducing cover for the compressor. Reduces the sound level by about 2 dBA.
Usage Guideline:
14.Thermostatic Expansion Valve (TXV) Single-Flow
A modulating flow-control valve which meters refrigerant liquid flow rate into the evaporator in response to the superheat of the refrigerant gas leaving the
evaporator. Kit includes valve, adapter tubes, and external equalizer tube. Both hard shutoff and RPB valves are available.
NOTE: When using a hard shut off TXV with single phase reciprocating compressors, a Compressor Start Assist — Capacitor and Relay is required.
Usage Guideline:
15. Time-Delay Relay
An SPST delay relay which briefly continues operation of indoor blower motor to provide additional cooling after the compressor cycles off.
NOTE: Most indoor unit controls include this feature. For those that do not, use the guideline below.
Usage Guideline:
Required in low ambient applications.
Required in long line applications.
Suggested in all commercial applications.
Required when low ambient kit has been added.
Suggested in all field-connected split-system air conditioners.
Suggested in installations exposed to "very dirty" outdoor air.
Suggested in installations where condenser inlet air temperature exceeds 125°F. (51.7°C)
When LLS is used with reciprocating compressors, Compressor Start Assist — Capacitor and Relay is required.
Required in air conditioner long line applications with a piston indoor metering device to prevent off cycle refrigerant migration. A hard shut
off TXV can be used instead of LLS in single flow air conditioner applications. See Long Line Application Guideline.
A Low-Ambient Pressure Switch or Motor Master ®—Low-Ambient Controller must be used when cooling operation is used at outdoor temperatures below 55°F (12.8°C).
A Motor Master ®—Low-Ambient Controller or Low-Ambient Pressure Switch must be used when cooling operation is used at outdoor temperatures below 55°F (12.8°C).
Suggested for all commercial applications.
Suggested for all Carrier thermostats listed in this publication.
Suggested when unit is installed closer than 15 ft to quiet areas—bedrooms, etc.
Suggested when unit is installed between two houses less than 10 ft apart.
Required to achieve ARI ratings in certain equipment combinations. Refer to combination ratings.
Hard shut off TXV or LLS required in air conditioner long line applications.
Required for use on all zoning systems.
For improved efficiency ratings for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
* Permissible limits of the voltage range at which unit will operate satisfactorily. Operation outside these limits may result in unit failure.
† If wire is applied at ambient greater than 30°C (86°F), consult Table 310-16 of the NEC (ANSI/NFPA 70).
The ampacity of nonmetallic-sheathed cable (NM), trade name ROMEX, shall be that of 60°C (140°F) conductors, per the NEC (ANSI/NFPA 70)
Article 336-26. If other than uncoated (non-plated), 60 or 75°C (140 or 167°F) insulation, copper wire (solid wire for 10 AWG and smaller, stranded
wire for larger than 10 AWG) is used, consult applicable tables of the NEC (ANSI/NFPA 70).
‡ Length shown is as measured 1 way along wire path between the unit and service panel for a voltage drop not to exceed 2%.
** Time-delay fuse.
FLA — Full Load Amps
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
RLA — Rated Load Amps
NOTES: 1. Control circuit is 24v on all units and requires external power source.
2. Copper wire must be used from service disconnect to unit.
3. All motors/compressors contain internal overload protection.
7
Page 8
Dimensions—38CKS
SQ
A
AIR DISCHARGE
IN.
-
8
/
3
DIA (28.6 mm)
AND 1
IN.
-
DIA KNOCKOUT
8
/
1
(22.2 mm) DIA HOLE
IN.
-
8
/
(34.9 mm)
WITH 1
KNOCKOUT
FIELD POWER SUPPLY CONN
7
IN. (22.2 mm)
-
8
/
7
FIELD CONTROL SUPPLY
CONN
IN. (9.5mm)
-
8
/
3
DIA HOLE
B
DIA LIQUID
LINE CONN
DIMENSIONSABCDEFGHJKLMNP
MOUNTING PAD
C
8˝
/
7
2
≤
(73.0 mm)
4˝
/
1
1
≤
(31.6 mm)
A05102
DIMENSIONSABCDEFGHJKLMNP
MOUNTING PAD
DIA VAPOR LINE CONN
D
P
AIR DISCHARGE
AIR IN
M
NOTES:
1. ALLOW 30” (762.0mm) CLEARANCE TO SERVICE SIDE OF UNIT, 48” (1219.2mm)
ABOVE UNIT, 6” (152.4mm) ON ONE SIDE, 12” (308.8mm) ON REMAINING SIDE, AND
24” (609.6mm) BETWEEN UNITS FOR PROPER AIRFLOW.
2. MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS 55°F (12.8°C)
MAX 125°F (51.7°C).
3. SERIES DESIGNATION IS THE 13TH POSITION OF THE UNIT MODEL NUMBER.
AIR IN
4. CENTER OF GRAVITY.
L
K
UNIT DIMENSIONS (MM)MINIMUM
UNIT DIMENSIONS (IN.)MINIMUM
J
AIR IN
H
G
F
E
N
IN. DIA
-
(9.5mm)
8
AIR IN
TIEDOWN
/
3
KNOCKOUTS
(2) PLACES
AIR DISCHARGE
8
S.I.
018A457.2658.8181.015.976.2381.0414.3450.9258.8409.6450.9200.0212.7257.2457.2 X 457.2
SIZESERIES
UNIT
024A571.5658.8181.015.993.7460.4501.7565.2365.1496.9560.4260.4241.3285.8571.5 X 571.5
030A571.5709.6181.019.193.7460.4501.7565.2365.1496.9560.4260.4241.3298.5571.5 X 571.5
036A571.5862.0181.019.193.7460.4501.7565.2365.1496.9560.4260.4241.3393.7571.5 X 571.5
042A762.0709.6182.622.2165.1596.9692.2755.7508.0687.4750.9393.7355.6393.7762.0 X 762.0
048A762.0862.0182.622.2165.1596.9692.2755.7508.0687.4750.9393.7355.6393.7762.0 X 762.0
060A762.0760.4182.622.2165.1596.9692.2755.7508.0687.4750.9393.7355.6381.0762.0 X 762.0
UNIT
ENGLISH
018A1825-15/163-3/165/831516-5/617-3/410-3/1616-1/817-3/47-7/88-3/810-1/818 X 18
024A22-1/225-15/163-3/165/83-11/1618-1/819-3/422-1/414-3/819-9/1622-1/1610-1/49-1/211-1/422-1/2 X 22-1/2
SIZESERIES
030A22-1/227-15/163-3/163/43-11/1618-1/819-3/422-1/414-3/819-9/1622-1/1610-1/49-1/211-3/422-1/2 X 22-1/2
036A22-1/233-15/163-3/163/43-11/1618-1/819-3/422-1/414-3/819-9/1622-1/1610-1/49-1/215-1/222-1/2 X 22-1/2
042A3027-15/163-1/47/86-1/223-1/227-1/429-3/42027-1/1629-9/1615-1/21415-1/230 X 30
048A3033-15/163-1/47/86-1/223-1/227-1/429-3/42027-1/1629-9/1615-1/21415-1/230 X 30
060A3029-15/163-1/47/86-1/223-1/227-1/429-3/42027-1/1629-9/1615-1/2141530 X 30
NOTE: When the required data fall between the published data, interpolation may be performed. Extrapolation is not an acceptable practice.
* Detailed cooling capacities are based on indoor and outdoor unit at the same elevation per ARI standard 210/240-94. If additional tubing length
and/or indoor unit is located above outdoor unit, a slight variation in capacity may occur.
† Total and sensible capacities are net capacities. Blower motor heat has been subtracted.
‡ Sensible capacities shown are based on 80°F (27°C) entering air at the indoor coil. For sensible capacities at other than 80°F (27°C), deduct 835
Btuh (245 kW) per 1000 CFM (480 L/S) of indoor coil air for each degree below 80°F (27°C), or add 835 Btuh (245 kW) per 1000 CFM (480 L/S)
of indoor coil air per degree above 80°F (27°C).
** Unit kW is total of indoor and outdoor unit kilowatts.
EWB — Entering Wet Bulb.
NOTE: When the required data fall between the published data, interpolation may be performed. Extrapolation is not an acceptable practice.
* Detailed cooling capacities are based on indoor and outdoor unit at the same elevation per ARI standard 210/240-94. If additional tubing length
and/or indoor unit is located above outdoor unit, a slight variation in capacity may occur.
† Total and sensible capacities are net capacities. Blower motor heat has been subtracted.
‡ Sensible capacities shown are based on 80°F (27°C) entering air at the indoor coil. For sensible capacities at other than 80°F (27°C), deduct 835
Btuh (245 kW) per 1000 CFM (480 L/S) of indoor coil air for each degree below 80°F (27°C), or add 835 Btuh (245 kW) per 1000 CFM (480 L/S)
of indoor coil air per degree above 80°F (27°C).
** Unit kW is total of indoor and outdoor unit kilowatts.
EWB — Entering Wet Bulb
1. Intended for outdoor installation with free air inlet and outlet. Outdoor fan external static pressure available is less
than 0.01-in. wc.
2. Minimum outdoor operating air temperature without low-ambient operation accessory is 55°F (12.8°C).
3. Maximum outdoor operating air temperature is 125°F (51.7°C).
4. For reliable operation, unit should be level in all horizontal planes.
5. Maximum elevation of indoor coil above or below base of outdoor unit is: indoor coil above = 50 ft (15.24m), indoor
coil below = 150 ft (45.72m).
6. For interconnecting refrigerant tube lengths between 50 (15.24m) and 175 (53.34m) ft and/or 20 (6.1m) ft vertical differential, consult Residential’s Split System Long-Line Application Guideline available from equipment distributor.
7. Crankcase heater required when interconnecting refrigerant tube length exceeds 50 ft (15.24m).
8. If any refrigerant tubing is buried, provide a minimum 6 in. (152mm) vertical rise to the valve connections at the
unit. Refrigerant tubing lengths up to 36 in. (912mm) may be buried without further consideration. For buried lines
longer than 3 ft (912mm), consult your local distributor.
9. Use only copper wire for electric connection at unit. Aluminum and clad aluminum are not acceptable for the type of
connector provided.
22
Page 23
23
Page 24
Guide specifications
Air-Cooled, Split-System
Air Conditioner
38CKS
1-1/2 to 5 Tons Nominal
(5.2 to 17.5 kW)
GENERAL
System Description
Outdoor-mounted, air-cooled, split-system air conditioner
unit suitable for ground or rooftop installation. Unit consists
of a hermetic compressor, an air-cooled coil, propeller-type
condenser fan, and a control box. Unit will discharge supply
air upward as shown on contract drawings. Unit will be used
in a refrigeration circuit to match up to a packaged fan coil
or coil unit.
Quality Assurance
Unit construction will comply with latest edition of ANSI/
ASHRAE and with NEC.
Unit will be constructed in accordance with UL standards
and will carry the UL label of approval. Unit will have c-UL
approval.
The condenser coil will be capable of withstanding the
following test method standards: Salt Spray test, ASTM
B117 1,000 hrs, and the Prohesion Test ASTM G85-A5
1,000 hrs.
Air-cooled condenser coils will be leak tested at 150 psig
(1034 KPa) and pressure tested at 300 psig (2068 KPa).
Unit constructed in ISO 9001 approved facility.
Delivery, Storage, and Handling
Unit will be shipped as single package only and is stored
and handled per unit manufacturer’s recommendations.
PRODUCTS
Equipment
Factory-assembled, single-piece, air-cooled air conditioner
unit. Contained within the unit enclosure is all factory
wiring, piping, controls, compressor, refrigerant charge
(R22), and special features required prior to field start-up.
Unit Cabinet
Unit cabinet will be constructed of galvanized steel,
bonderized, and coated with a powder coat paint.
F
ans
Condenser fan will be direct-drive propeller type,
discharging air upward.
Condenser fan motors will be totally enclosed, 1-phase
type with class B insulation and permanently lubricated
bearings.
Shafts will be corrosion resistant.
Fan blades will be statically and dynamically balanced.
Condenser fan openings will be equipped with PVC-coated
steel wire safety guards.
Compressor
Compressor will be hermetically sealed.
Compressor will be mounted on rubber vibration isolators.
Condenser Coil
Condenser coil will be air cooled.
Coil will be constructed of aluminum fins with a resinbased epoxy phenolic thermoset coating, factory applied by
pre-coating and baking. The fins are mechanically bonded to
copper tubes which are then cleaned, dehydrated, and sealed.
Refrigeration Components
Refrigeration circuit components will include liquid line
shutoff valve with sweat connections, suction line shutoff
valves with sweat connections, system charge of R22
refrigerant, and compressor oil.
Operating Characteristics
The capacity of the unit will meet or exceed _____ Btuh at
a suction temperature of _____ °F (°C). The power
consumption at full load will not exceed _____ kW.
Combination of the unit and the evaporator or fan coil unit
will have a total net cooling capacity of _____ Btuh (kW) or
greater at conditions of _____ CFM entering air temperature
at the evaporator at _____ °F (°C) wet bulb and _____ °F
(°C) dry bulb, and air entering the unit at _____ °F (°C).
The system will have a SEER of _____ Btuh/watt or greater
at DOE conditions.
Electrical Requirements
Nominal unit electrical characteristics will be _____ v,
single phase, 60 hz. The unit will be capable of satisfactory
operation within voltage limits of _____ v
to _____ v.
Unit electrical power will be single point connection.
Control circuit will be 24v.
Special Features
Refer to section of this literature identifying accessories
and descriptions for specific features and available
enhancements.
Carrier Corporation • Indianapolis, IN 46231 9-05
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.