Carrier 38CKX Operation manual

Copyright 1999 Carrier Corporation Form 38CKX-C3PD
Product
Data
38CKX 50 Hz
Air Conditioner
38CKX Sizes 024 thru 060
Model 38CKX 50 Hertz Energy-
Efficient 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
coatedforalong-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.

2
Unit Design — Copper tube, enhanced
sine wave aluminum fin coil is designed
for optimum heat transfer. Vertical air
discharge carries sound and hot
condenserair upand awayfromadjacent
patio areas and foliage. Heat pump style
drain pan allows for easy removal of
water, dirt, and leaves.
Application Versatility — The unit
canbe combined with awide varietyof
evaporator coils and blower packages
to provide quiet, dependable comfort.
Unit can be installed on a roof or at
ground level.
External ServiceValves — 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
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.
The data in this publication is displayed for all series, however, every series may not be available from manufacturer.
Physical data
* Tube sizes are for runs up to 50 ft (15.24m). For tube set over 50 ft (15.24m), consult Residential Split System Long-Line Application Guideline.
NOTE: See unit Installation Instructions for proper installation.
UNIT SIZE/SERIES 024-71 036-71, 91 048-91 060-91
OPERATING WT (Lb/Kg)
131 / 59.4 148 / 67.1 209 / 94.8 220 / 99.8
COMPRESSOR
Manufacturer &Type
Copeland & Recip Copeland & Recip Copeland & Scroll Copeland & Scroll
REFRIGERANT
Control
Charge (Lb/Kg) @ 15 ft
22
AccuRater® (Bypass Type)
3.4 / 1.5 4.8 / 2.2 6.25 / 2.8 9.75 / 4.4
COND FAN
Air Discharge
Air Qty (CFM / L/S)
Propeller Type, Direct Drive
Vertical
2600 / 1214 3300 / 1541
COND COIL
Face Area (Sq ft / m
2
)
7.5 / 0.697 10.8 / 1.003 14.9 / 1.384 22.4 / 2.081
VALVE CONNECT. (In./mm ID)
Vapor
Liquid
Sweat
5/8 / 15.875 3/4 / 19.05 7/8 / 22.225
3/8 / 9.525
REFRIGTUBES* (In./mm OD)
Vapor
Liquid
5/8 / 15.875 3/4 / 19.05 7/8 / 22.225 1-1/8 / 28.575
3/8 / 9.525
Model number nomenclature
38CKX 024
Electric Air Conditioner
Nominal Capacity
024 — 24,000 Btuh (7.0 Kw) 048 — 48,000 Btuh (14.1 Kw)
036 — 36,000 Btuh (10.6 Kw) 060 — 60,000 Btuh (17.6 Kw)
713
Packaging
Series
Electrical
7 — 230-1-50
9 — 400-3-50
IP24
Additional Compressor Protection
— Each compressor is protected with
internal temperature- and current-
sensitive 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.
Quality Assurance
REGISTERED QUALITY SYSTEM

3
Accessories
* Do not use hard shutoff TXV with liquid solenoid valve.
ACCURATER® PISTON CHART
* 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.
PART NO. DESCRIPTION
KSAHS1001AAA
Start Assist — Capacitor/Relay — Size 024-71
KSAHS1301AAA Start Assist — Capacitor/Relay — Sizes 036-71
KAACS0101PTC Start Assist — PTC — Size 024-71
KAACS0201PTC Start Assist — PTC — Size 036-71
KAALS0101LLS* Liquid Solenoid Valve — All Sizes
KSACY0101AAA Cycle Protector — Sizes 024, 036
Standard Cycle Protector — Sizes 048, 060
KAAWS0101AAA Winter Start Control — All Sizes
KAAFT0101AAA Evaporator FreezeThermostat — All Sizes
Standard High-Pressure Switch — All Sizes
Standard Low-Pressure Switch — All Sizes
KAATD0101TDR Time-Delay Relay — All Sizes
KSASF0101AAA Support Feet — All Sizes
Standard Crankcase Heater — All 3-Phase Units
KAACH1001AAA Crankcase Heater — Sizes 024-71, 036-71
KAACF1001MED Coastal Filter — Sizes 024, 036
KAACF1101LRG Coastal Filter — Sizes 048, 060
KAATX0301RPB Thermostatic Expansion Valve (RPB) — Size 024
KAATX0501RPB Thermostatic Expansion Valve (RPB) — Size 036
KAATX0601RPB Thermostatic Expansion Valve (RPB) — Size 048
KAATX0701RPB Thermostatic Expansion Valve (RPB) — Size 060
KAATX0601HSO* Thermostatic Expansion Valve (Hard Shutoff) — Sizes 024, 036
KAATX0701HSO* Thermostatic Expansion Valve (Hard Shutoff) — Sizes 048, 060
P251-0083 (RCD) Low-Ambient Controller — All Sizes
KSALA0201R22 Low Ambient Kit — All Sizes
32LT660004† (RCD) MotorMaster® Controller (RCD) — Sizes 024, 036-71
32LT660005† (RCD) MotorMaster® Controller (RCD) — Sizes 036-91, 048, 060
P504-8083S (RCD) Filter Drier — Sizes 024, 036
P504-8183S (RCD) Filter Drier — Sizes 048, 060
THERMOSTAT DESCRIPTION
TSTATCCNAC01-B
Thermostat, Auto Changeover, Non-Programmable, °F/°C, 1-Stage Heat, 1-Stage Cool
TSTATCCPAC01-B Thermostat, Auto Changeover, 7-Day Programmable, °F/°C, 1-Stage Heat, 1-Stage Cool
TSTATCCBAC01-B Builder’sThermostat, Manual Changeover, Non-Programmable, °F/°C, 1-Stage Heat, 1-Stage Cool
TSTATCCPRH01-B Thermidistat Control—Programmable/Non-Programmable Thermostat with Humidity Control
TSTATCCSAC01
Thermostat, Manual Changeover, 5-2 Day Programmable, °F/°C, 1-Stage Heat/1-Stage Cool,
50/60 Hz, 24 Vac
TSTATXXSEN01-B Outdoor Air Temperature Sensor
TSTATXXBBP01 Backplate for Builder’s Thermostat
TSTATXXNBP01 Backplate for Non-ProgrammableThermostat
TSTATXXPBP01 Backplate for ProgrammableThermostat
TSTATXXSBP01 Backplate for Standard ProgrammableThermostat
TSTATXXCNV10 Thermostat Conversion Kit (4 to 5Wire) — 10 pack
UNIT SIZE PISTON IDENTIFICATION NO.*
024-71 63
036-71, 91 73
048-91 90
060-91 101

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/RelayType
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).
Installations where outdoor design temperature exceeds 105°F (40.6°C).
Replacement installations with hard shutoff expansion valve on indoor coil.
3.
Compressor Start Assist — PTC Type
Solid-state electrical device which gives a ‘‘soft’’ boost to the compressor at each start-up.
SUGGESTED USE: Installations with marginal power supply.
Replacement installations with rapid pressure balance (RPB) thermostatic expansion valve on indoor coil.
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 (15.24m).
When unit will be operated below 55°F (12.8°C) outdoor air temperature. (Use with low-ambient controller.)
All commercial installations.
5.
Cycle Protector
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.
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.
6.
Evaporator FreezeThermostat
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
Unitary Directory.) In certain long-line applications. (Refer to Long-Line Application Guideline).
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.
Windy areas or where debris is normally cirdculating.
Rooftop 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
Unitary Directory.
Required for use on all zoning systems.
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 toARI Unitary Directory.)
12.
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.

5
Electrical data
* 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 AWG 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.
2. Copper wire must be used from service disconnect to unit.
3. All motors/compressors contain internal overload protection.
UNIT
SIZE V/PH
OPERVOLTS* COMPRESSOR FAN
FLA MCA
FIELDWIRE SIZE MAX FUSE†
OR
CKT BKR
AMPS
Min
Wire
Size
60°C/75°C**
Max
Length
(m)
60°C/75°C‡
Max Min LRA RLA
024-71
230-1 253 207 68.0 11.6 0.65 15.2 14/14 16.2/15.2 25
036-71 94.0 17.7 0.65 22.8 12/12 16.8/15.8 35
036-91
400-3 440 360 42.0 6.4 0.40 8.4 14/14 61.6/58.5 15 048-91 63.0 7.9 0.70 10.6 14/14 50.3/47.9 15
060-91 74.0 9.0 0.70 12.0 14/14 46.3/43.9 20