The 38CKS Air Conditioner is
designed for superior performance
durability in harsh environments. The
product achieves up to 11 SEER ratings
when used with manufacturer specified
components. The product is av ailable in
seven standard nominal sizes ranging
from 018 to 060 for residential and light
commercial applications. All models are
listed with UL, cUL, CEC, ARI, CSA,
and PFS.
FEATURES/BENEFITS
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 coil is
protected with an enhanced coil guard.
With maximum horizontal opening of
10.5 mm and construction of coated
wire, the guard helps to protect from
inclement weather (hail), vandalism,
and incidental damage.
Cabinet Protection—Provides
superior durability through added paint
coverage on all sheet metal
components. Steel is protected with a
galvanized coating and treated with a
layer of zinc phosphate. A modified
polyester powder coating is then
applied and baked on, providing each
unit with a hard, smooth 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 1999 Carrier CorporationForm 38CKS-1PD
Page 2
Model
Money Saving Operation—
Investment protection through long
lasting components in harsh
conditions. Unit meets ARI rated
efficiencies as shipped.
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.
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CERTIFICATION APPLIES ONLY
WHEN THE COMPLETE SYSTEM
IS LISTED WITH ARI.
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Easy Serviceability—Single access
panel provides simple access to
electrical control box. Top of unit
allows access to fan motor and internal
components.
Compressor Protection— Each
compressor is protected with internal
temperature and current sensitive
overloads.
Limited W arranty—Standard 1 year
warranty on parts, with an additional 4
year warranty on compressor and
outdoor coil.
Thermidistat Control, Programmable/Non-Programmable Thermostat with Humidity Control
Thermostat, Auto Changeover, Non-Programmable, °F/°C, 1-Stage Heat, 1-Stage Cool
Thermostat, Auto Changeover, 7-Day 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
Low Ambient Controller,
MotorMaster® Control,
or Low-Ambient Pressure Switch
Wind Baffle
Coastal Filter
Unit Risers
Liquid-Line Solenoid Valve
Ball Bearing Fan Motor
* For tubing line sets between 50 and 175 ft, refer to Residential Split Systems Long-Line Application Guideline.
† Only when low-pressure switch is used.
‡ Required for Low-Ambient Controller (full modulation feature) and MotorMaster® Control only.
or
Hard Shutoff TXV
APPLICATIONS
(Below 55°F)
YesYesNo
YesNoNo
Yes†NoNo
NoNoNo
YesYesNo
YesNoNo
See Low-Ambient
InstructionsNoNo
NoNoNo
RecommendedNoRecommended
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)
1. Ball Bearing Fan Motor
A fan motor with ball bearings which permits speed reduction while maintaining bearing lubrication.
SUGGESTED USE: Required on all units where Low-Ambient Controller (full modulation feature) or MotorMaster® Control has been added.
2. Compressor Start Assist — Capacitor and Relay
Start capacitor and start relay gives “hard” boost to compressor motor at each start-up.
SUGGESTED USE: Installations where interconnecting tube length exceeds 50 ft.
3. Compressor Start Assist — PTC
Solid-state electrical device which gives a “soft” boost to the compressor at each start-up.
SUGGESTED USE: Installations with marginal power supply.
4. 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 chance of refrigerant slugging. May or may not include a thermostat control.
SUGGESTED USE: When interconnecting tube length exceeds 50 ft.
5. Cycle Protector
Solid-state timing device which prevents compressor rapid recycling. Control pro vides an approximate 5-minute delay after po wer to the compressor has been
interrupted for any reason, including normal room thermostat cycling.
SUGGESTED USE: Installations in areas where power interruptions are frequent.
Installations where outdoor design temperature exceeds 105°F (40.6°C).
Replacement installations with hard shutoff expansion valve on indoor coil.
Installations where Liquid-Line Solenoid Valve has been added.
Replacement installations with rapid pressure balance (RPB) expansion valve on indoor coil.
When unit will be operated below 55°F (12.8°C) outdoor air temperature. (Use with low-ambient controller.)
All commercial installations.
Where user is likely to “play” with the room thermostat.
All commercial installations.
Installations where interconnecting tube length exceeds 50 ft.
High-rise applications.
5
Page 6
Accessory description and usage (continued)
6. Evaporator Freeze Thermostat
An SPST temperature actuated switch which stops unit operation when evaporator reaches freeze-up conditions.
SUGGESTED USE: All units where Winter Start Control has been added.
7. Filter Drier
A device for removing contaminants from refrigerant circulating in an air conditioner: 1-direction flow.
SUGGESTED USE: All split-system air conditioners.
8. 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 400 ± 10 psig
and resets at 298 ± 20 psig. Provides protection against compressor damage due to loss of outdoor airflow. To prevent rapid compressor recycling, Cycle
Protector can be used with this switch.
SUGGESTED USE: Installations exposed to very “dirty” outdoor air.
Installations where condenser inlet air temperature exceeds 125°F (51.7°C).
9. Liquid-Line Solenoid Valve (LSV)
An electrically operated shutoff valve to be installed at the outdoor or indoor unit (depending on tubing configuration) which stops and starts refrigerant liquid
flow in response to compressor operation. Maintains a column of refrigerant liquid ready for action at next compressor operation cycle.
NOTE: Compressor Start Assist—Capacitor and Relay must also be used. Do not use with hard shutoff TXV.
SUGGESTED USE: For improved system performance in air conditioners for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
In certain long-line applications. Refer to Long-Line Application Guideline.
10. Low-Ambient Controller
Head pressure controller is a cycle control device activated by a temperature sensor mounted on a header tube of the outdoor coil. It is designed to cycle the
outdoor fan motor in order to maintain condensing temperature within normal operating limits (approximately 100°F high and 60°F low).
The control will maintain working head pressure at low-ambient temperatures down to 0°F when properly installed.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F (12.8°C).
11. Low-Pressure Switch
Auto reset SPST switch activated by refrigerant pressure on low side of refrigerant circuit. Cycles compressor off if refrigerant pressure drops to about 27
psig. Prevents indoor coil freeze-up due to loss of indoor airflow. Provides additional protection against compressor damage due to loss of refrigerant charge.
To prevent rapid compressor recycling, Cycle Protector can be used with this switch.
SUGGESTED USE: Where indoor coil is exposed to “dirty” air.
All commercial installations.
12. MotorMaster® Control
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, it maintains condensing temperature at 100°F ± 10°F.
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F.
All commercial installations.
13. Outdoor Air Temperature Sensor
A device that allows the temperature at a remote location (outdoors) to be displayed at the thermostat.
SUGGESTED USE: All corporate programmable thermostats.
14. Sound Hood
Wraparound sound attenuation cover for the compressor. Reduces unit sound level by about 2 dBA.
SUGGESTED USE: Unit installed closer than 15 ft to quiet areas — bedrooms, etc.
Unit installed between 2 houses less than 10 ft apart.
15. Thermostatic Expansion Valve (TXV)
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. Do not use hard shutoff TXV with
Liquid-Line Solenoid Valve.
SUGGESTED USE: For improved system performance in cooling mode for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
Required for use on all zoning systems.
16. Time-Delay Relay
An SPST delay relay which briefly continues operation of the indoor blower motor to provide additional cooling after the compressor cycles off.
SUGGESTED USE: For improved efficiency ratings for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
17. Winter Start Control
An SPST delay relay which bypasses the low-pressure switch for approximately 3 minutes to permit start-up for cooling operation under low-load conditions.
SUGGESTED USE: All air conditioners where Low-Ambient Controller has been added.
* 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 A WG 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
ASQ
AIR DISCHARGE
-IN. DIA
8
/
-IN. DIA
8
/
3
-IN. DIA KNOCKOUT
8
-IN. DIA HOLE WITH
/
1
8
/
FIELD POWER SUPPLY CONN
7
AND 1
1
7
-IN. DIA LIQUID
8
/
3
HOLE
LINE CONN
FIELD CONTROL SUPPLY
CONN
KNOCKOUT
B
A99065
DIMENSIONSABCDEFGHJKLMNP
MOUNTING PAD
C
/8″
7
2
/4″
1
1
D DIA VAPOR LINE CONN
P
AIR DISCHARGE
AIR IN
M
AIR IN
L
K
NOTES:
1. ALLOW 30" CLEARANCE TO SERVICE SIDE OF UNIT, 48" ABOVE UNIT, 6" ON ONE
SIDE, 12" ON REMAINING SIDE, AND 24" BETWEEN UNITS FOR PROPER AIRFLOW.
2. MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS 55°F, MAX. 125°F.
3. SERIES DESIGNATION IS THE 13TH POSITION OF THE UNIT MODEL NUMBER.
4. CENTER OF GRAVITY .
UNIT DIMENSIONSMINIMUM
DIMENSIONS (IN.)
J
AIR IN
H
G
F
E
N
AIR IN
TIEDOWN
/8 -IN. DIA
3
(2) PLACES
KNOCKOUTS
AIR DISCHARGE
8
SIZESERIES
UNIT
01801825-5/163-3/165/831516-5/1617-3/410-3/1616-1/817-3/47-7/88-3/810-1/818 X 18
024022-1/225-5/163-3/165/83-11/1618-1/819-3/422-1/414-3/819-9/1622-1/1610-1/49-1/211-1/422-1/2 X 22-1/2
030022-1/227-5/163-3/163/43-11/1618-1/819-3/422-1/414-3/819-9/1622-1/1610-1/49-1/211-3/422-1/2 X 22-1/2
036022-1/233-5/163-3/163/43-11/1618-1/819-3/422-1/414-3/819-9/1622-1/1610-1/49-1/215-1/222-1/2 X 22-1/2
04203027-5/163-1/47/86-1/223-1/227-1/429-3/42027-1/1629-9/1615-1/21414-1/230 X 30
04803033-5/163-1/47/86-1/223-1/227-1/429-3/42027-1/1629-9/1615-1/21415-1/230 X 30
06003029-5/163-1/47/86-1/223-1/227-1/429-3/42027-1/1629-9/1615-1/2141530 X 30
† In most cases, only 1 method should be used to achieve TDR function. Using more than 1 method in a system may cause degradation in perfor-
mance. Use either the accessory Time-Dela y Rela y KAATD0101TDR or a furnace equipped with TDR. All Carrier furnaces are equipped with TDR
except for the 58GFA.
‡ TXV must be hard shutoff type, based on computer simulation.
NOTES: 1. Ratings are net values reflecting the effects of circulating fan motor heat. Supplemental electric heat is not included.
2. Tested outdoor/indoor combinations have been tested in accordance with DOE test procedures for central air conditioners. Ratings for
other combinations are determined under DOE computer simulation procedures.
3. Determine actual CFM values obtainable for your system by referring to fan performance data in fan coil or furnace coil literature.
4. Minimum outdoor operating ambient in cooling mode is 55°F (12.8°C), maximum 125°F (51.7°C).
14
Page 15
Detailed cooling capacities*
EVAPORATOR
AIR
CFMEWB
758595105115125
Capacity
MBtuh†
Kw**
Tot
Sys
Capacity
MBtuh†
CONDENSER ENTERING AIR TEMPERATURES °F
Tot
Sys
Kw**
Capacity
MBtuh†
Kw**
Tot
Sys
Capacity
MBtuh†
Tot
Sys
Kw**
Capacity
MBtuh†
Tot
Sys
Kw**
Capacity
MBtuh†
38CKS018-30 Outdoor Section With CC5A/CD5AA018 Indoor Section
* 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).
When the required data falls between the published data, interpolation may be performed.
** 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, indoor coil
below = 150 ft.
6. For interconnecting refrigerant tube lengths between 50 and 175 ft, 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.
8. If any refrigerant tubing is buried, provide a minimum 6 in. vertical rise to the valve connections at the unit.
Refrigerant tubing lengths up to 36 in. may be buried without further consideration. For buried lines longer than 3 ft,
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.
26
Page 27
Guide specifications
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 will be rated in accordance with the latest edition of
ARI Standard 210.
Unit will be certified for capacity, efficiency, and listed in
the latest ARI directory.
Unit construction will comply with latest standard 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 ha ve 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
and pressure tested at 300 psig.
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.
Warranty (for inclusion by specifying engineer)
U.S. and Canada only.
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.
Air-Cooled, Split-System
Air Conditioner
38CKS
1-1/2 to 5 Tons Nominal
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. The power consumption
at full load will not exceed _____ kw.
Combination of the unit and the evaporator or f an coil unit
will have a total net cooling capacity of _____ Btuh or
greater at conditions of _____ CFM entering air temperature
at the evaporator at _____ °F wet bulb and _____ °F dry
bulb, and air entering the unit at _____ °F.
The system will have an SEER of _____ Btuh/watt or
greater at DOE conditions.
Electrical Requirements
Nominal unit electrical characteristics will be _____ v,
single phase, 60 hertz. 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.
27
Page 28
SERVICE TRAINING
Packaged Service Training programs are an excellent way to increase your
knowledge of the equipment discussed in this manual, including:
• Unit Familiarization• Maintenance
• Installation Overview• Operating Sequence
A large selection of product, theory, and skills programs is available, using popular
video-based formats and materials. All include video and/or slides, plus companion
book.
Classroom Service Training plus "hands-on" the products in our labs can mean
increased confidence that really pays dividends in faster troubleshooting, fewer
callbacks. Course descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-962-9212
[ ] Packaged Service Training[ ] Classroom Service Training
A94328
Carrier Corporation • Indianapolis, IN 46231 4-99
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.