Model 38CKX 50 Hertz EnergyEfficient Air Conditioner incorporates
innovative technology to provide
reliable summer cooling performance.
Built into these units are the features
most desired by consumers today,
including SEER ratings of up to 10.0
when used with components
designated by manufacturer.
AVAILABLE OPTIONS
Electrical Range — Units are offered
in 230v single phase for 024 and 036
sizes. Three-phase units are available
in 036, 048, and 060 sizes in 400v.
Wide Range of Sizes — The 38CKX
is available in nominal sizes 024, 036,
048, and 060 to meet the needs of
residential and light commercial
applications.
Weather Armor II Cabinet — The
steel is protected with a galvanize
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.
All screws on cabinet exterior are
coated for a long-lasting, rust-resistant,
quality appearance.
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.
The motor was then qualified under
extreme conditions to help ensure a
long, reliable life.
Copyright 1999 Carrier CorporationForm 38CKX-C3PD
Page 2
)
Unit Design — Copper tube, enhanced
sine wave 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 remov al of
water, dirt, and lea v es.
Application Versatility — The unit
can be combined with a wide variety of
evaporator coils and blower packages
to provide quiet, dependable comfort.
Unit can be installed on a roof or at
ground level.
External Service Valves — Both
service valves are brass, front seating
type. The 38CKX has sweat field
connections. Valves are externally
located so refrigerant tube connections
can be made quickly and easily . Each
valve has a service port for ease of
checking operating refrigerant pressures.
Easy Serviceability — One access
panel provides access to electrical
Quality Assurance
IP24
REGISTERED QUALITY SYSTEM
Model number nomenclature
38CKX024
controls and compressor. Removal of
wire dome gives access to fan motor
and removal of the top gives access to
the coil.
Standard Features — All units are
equipped with high and low-pressure
switches. The 048 and 060 sizes have a
compressor short cycle protector. The
036, 048 and 060 sizes also have a
compressor sound hood for noise
attenuation.
Additional Compressor Protection
— Each compressor is protected with
internal temperature- and currentsensitive overloads.
Safety — All units are designed and
manufactured in accordance with
Underwriters Laboratories (UL 1995)
safety standard for heating and cooling
equipment. The design
and construction are in compliance
with European standards to bear
the CE Mark.
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
Thermidistat Control—Programmable/Non-Programmable Thermostat with Humidity Control
Thermostat, Manual Changeover, 5-2 Day Programmable, °F/°C, 1-Stage Heat/1-Stage Cool,
50/60 Hz, 24 Vac
Outdoor Air Temperature Sensor
Backplate for Builder’s Thermostat
Backplate for Non-Programmable Thermostat
Backplate for Programmable Thermostat
Backplate for Standard Programmable Thermostat
Thermostat Conversion Kit (4 to 5 Wire) — 10 pack
ACCURATER® PISTON CHART
UNIT SIZE
024-71
036-71, 91
048-91
060-91
* Piston listed is for any approved non-capillary tube coil combination.
Piston is shipped with outdoor unit and must be installed in an
approved indoor coil.
PISTON
IDENTIFICATION NO.*
101
3
Page 4
Accessory description and usage (Listed alphabetically)
1.
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.
SUGGESTED USE: In geographic areas where salt damage could occur.
2.
Compressor Start Assist — Capacitor/Relay Type
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 (15.24m).
Compressor Start Assist — PTC Type
3.
Solid-state electrical device which gives a ‘‘soft’’ boost to the compressor at each start-up.
SUGGESTED USE: Installations with marginal power supply.
Crankcase Heater
4.
An electric resistance heater which mounts to the base of the compressor to keep the lubricant warm during off cycles. Improv es 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 (15.24m).
Cycle Protector
5.
Solid-state timing device which prevents compressor rapid recycling. Control provides an approximate 5-minute delay after power to the
compressor has been interrupted for any reason, including normal room thermostat cycling.
SUGGESTED USE: Installations in areas where power interruptions are frequent.
Evaporator Freeze Thermostat
6.
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.
Liquid 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/relay type must also be used.
SUGGESTED USE: For improved system performance in air conditioners for certain combinations of indoor and outdoor units. (Refer to ARI
8.
Low-Ambient Controller
This solid-state head pressure controller is a cycle control device activated by a temperature sensor. It is specifically designed to control
outdoor fan motor run time in response to saturated condensing temperature. For outdoor air temperatures between 55°F and 0°F
(12.8°C and –17.8°C), it maintains condensing temperature at 75°F and 130°F (23.8°C and 54.4°C).
SUGGESTED USE: Cooling operation at outdoor temperatures below 55°F (12.8°C).
9.
Support Feet
Four stick-on plastic feet which raise the unit 4 in. above the mounting pad. This allows sand, dirt, and other debris to be flushed from the
unit base; minimizes corrosion.
SUGGESTED USE: Coastal installations.
10.
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.
SUGGESTED USE: For improved system performance in cooling mode for certain combinations of indoor and outdoor units. (Refer to ARI
11.
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.)
Winter Start Control
12.
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.
Installations where outdoor design temperature exceeds 105°F (40.6°C).
Replacement installations with hard shutoff expansion valve on indoor coil.
Replacement installations with rapid pressure balance (RPB) thermostatic 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 (15.24m).
High-rise applications.
Unitary Directory.) In certain long-line applications. (Refer to Long-Line Application Guideline).
Windy areas or where debris is normally cirdculating.
Rooftop installations.
Unitary Directory.
Required for use on all zoning systems.
4
Page 5
Electrical data
FIELD WIRE SIZE
Min
UNIT
SIZEV/PH
024-71
036-71
036-91
048-91
060-91
* Permissible limits of the voltage range at which unit will operate satisfactorily. Operation outside these limits may result in unit failure.
† Time-delay fuse.
‡ Length shown is as measured 1 way along wire path between the unit and service panel for a voltage drop not to exceed 2%.
** 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).
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.
230-1253207
400-3440360
2. Copper wire must be used from service disconnect to unit.
3. All motors/compressors contain internal overload protection.
OPER VOL TS*COMPRESSOR
MaxMinLRARLA
68.011.60.6515.214/1416.2/15.225
94.017.70.6522.812/1216.8/15.835
42.06.40.408.414/1461.6/58.515
63.07.90.7010.614/1450.3/47.915
74.09.00.7012.014/1446.3/43.920
FAN
FLAMCA
Wire
Size
60°C/75°C**
Max
Length
(m)
60°C/75°C‡
MAX FUSE†
OR
CKT BKR
AMPS
5
Page 6
Dimensions
/
IN. (34.9mm) DIA
8
/
3
IN. (28.6mm) DIA KNOCKOUT
8
IN. (22.2mm) DIA HOLE WITH
/
1
8
/
FIELD POWER SUPPLY CONN
7
AND 1
1
FIELD CONTROL SUPPLY
KNOCKOUT
IN. (22.2mm) DIA
8
/
7
HOLE
3
CONN
IN. (9.5mm) DIA LIQUID
8
/
LINE CONN
C
/8″
7
2
(73.0mm)
/4″
1
1
(31.8mm)
A97007
WEIGHT
SHIPPING
ASQ
AIR DISCHARGE
AIR DISCHARGE
AIR IN
D DIA VAPOR LINE CONN
P
B
AIR IN
L
NOTES: 1. Allow 30 In. (762.0mm) clearance to service side of unit, 48 In. (1219.2mm) above
unit, 6 In. (152.4mm) on one side, 12 In. (308.8mm) on remaining side, and 24 In.
(609.6mm) between units for proper airflow.
(52°C).
2. Minimum outdoor operating ambient in cooling mode is 55°F (13°C), max 125°F
3. Series designation is the 13th position of the unit model number.
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).
Sound power (dBA)
UNIT
SIZE
024-71
036-71
036-91
048-91
048-91
SOUND
LEVEL
(dBA)
77
75
78
77
76
1252505001000200040008000
52.0
54.0
59.0
52.0
54.5
A-WEIGHTED SOUND POWER LEVELS WITHIN OCTAVE BAND SHOWN (Hz)
65.5
65.0
68.0
64.0
61.0
67.0
66.5
68.0
69.5
66.5
69.0
69.5
72.5
70.5
69.5
68.0
67.0
73.0
68.5
68.5
68.5
66.5
71.0
66.5
68.0
5.8
5.8
8.9
9.1
12.2
12.5
15.0
15.3
Power
KWCFML/SBTUHKWBTUHKW
3.03
3.02
4.32
4.35
5.50
5.56
7.50
7.47
63.0
60.5
67.0
63.0
63.5
7
Page 8
Detailed cooling capacities* (S.I.)
CONDENSER ENTERING AIR TEMPERATURES °C
Capacity†
(KW)
Sys.
Power
KW**
Capacity†
(KW)
Sys.
Power
KW**
Capacity†
(KW)
Sys.
Power
KW**
Capacity†
(KW)
Sys.
Power
KW**
L/S
EVAP.
AIR
28323640444852
Capacity†
(C)
EWB
(KW)
Total Sens‡Total Sens‡T otal Sens‡Total Sens‡Total Sens‡Total Sens‡T otal Sens‡
Sys.
Power
KW**
Capacity†
(KW)
Sys.
Power
KW**
38CKX024-71 Outdoor Section With FB4ASX024 Indoor Section
Multipliers for Determining the Performance With Other Indoor Sections
Indoor
SectionSize
FB4ASX0601.001.00FB4ASX0701.021.03
CapacityPowerCapacityPower
Cooling
Indoor
SectionSize
* 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 27°C entering air at the indoor coil. For sensible capacities at other than 27°C, deduct 245 kw per 480
L/S of indoor coil air for each degree below 27°C, or add 245 kw per 480 L/S of indoor coil air per degree above 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.
1. Intended for outdoor installation with free air inlet and outlet. Outdoor fan external static pressure available is less than 0.01-in. wg.
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 greater than 50 ft (15.24m), consult 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.
11
Page 12
Guide specifications
Air-Cooled, Split-System
Air Conditioner
38CKX
2 to 5 Tons Nominal
(7 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 shall be manufactured in a facility registered to
ISO9001/BS5750 Part II, International Standard for quality
systems. Unit design shall comply with European standards
and bear the CE Mark.
Unit will be rated in accordance with the latest edition of
ARI Standard 210.
Unit construction will comply with latest edition of ANSI/
ASHRAE and with NEC (U.S.A. Standard).
Unit will be constructed in accordance with UL standards.
Unit cabinet will be capable of withstanding Federal Test
Method Standard No. 141 (Method 6061) 500-hr salt spray
test (U.S.A. Standard).
Air-cooled condenser coils will be leak tested at 150 psig
(1034 KPa) and pressure tested at 300 psig (2068 KPa).
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
(R-22), 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 mechanically
bonded to copper tubes which are then cleaned, dehydrated,
and sealed.
Refrigeration Components
Refrigeration circuit components will include liquid line
shutoff valv e with sweat connections, suction shutof f v alves
with sweat connections, system charge of refrigerant R-22,
and compressor oil.
Operating Characteristics
The capacity of the unit will meet or exceed _____ Btuh
(kw) 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 f an coil unit
will have a total net cooling capacity of _____ Btuh (kw)
or greater at conditions of _____ CFM (L/S) entering air
temperature at the evaporator at _____ °F (°C) wet bulb
and _____ °F (°C) dry bulb, and air entering the unit at
_____ °F (°C).
Electrical Requirements
Nominal unit electrical characteristics will be _____ v,
__ phase, 50 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.
Carrier Corporation • Indianapolis, IN 4623112-99
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 124Page 12Catalog No. 003-800Printed in U.S.A.PC 101Form 38CKX-C3PD
Tab 3a 1a 2aReplaces: 38CKX-C2PD
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