42TKS (50 Hz)

Direct Expansion Fan Coil

R- 410A Refrigerant
Sizes 018 thru 060

Product Data

FAN COIL TECHNOLOGY

AT ITS FINEST

The 50Hz 42TKS fan coil has the proven

technology of Carrier fan coil units with
Puron refrigerant for horizontal
applications. The design features
contoured condensate pans with rugged
drain connections, ensuring that little
water is left in the unit at the end of the
cooling duty cycle. The lack of standing
condensate and corrosion free pans
improves IAQ and product life, features
homeowners appreciate.

Standard features include grooved

tubing and louvered fins. Coil circuiting
has also been updated to make the most
of all Carrier air conditioners. Units come
with solid state fan controls, 6mm thick
insulation, multi- speed motors, and fully-
wettable coils.

Units Manufactured in UAE

 TABLE OF CONTENTS
Page
FEATURES / BENEFITS ..................................................................................................................................................... 2
MODEL NUMBER NOMENCLATURE ................................................................................................................................ 3
TECHNICAL DATA .............................................................................................................................................................. 4
UNIT DIMENSIONS ........................................................................................................................................................... 5
ELECTRICAL DATA .......................................................................................................................................................... 6
COMBINATION MATRIX ................................................................................................................................................... 6
WIRING DIAGRAM ............................................................................................................................................................ 7
FAN PERFORMANCE ......................................................................................................................................................... 8
OPTIONS AND ACCESSORIES ....................................................................................................................................... 9
GUIDE SPECIFICATIONS ................................................................................................................................................. 9
SAFETY CONSIDERATIONS............................................................................................................................................ 11
RECEIVING / INSTALLATION / STARTUP / SERVICE .............................................................................................. 12-16
CONTROLLER FOR DUCTED FAN COIL UNITS ....................................................................................................... 17-19
TROUBLESHOOTING ...................................................................................................................................................... 20
START-UP CHECK LIST ............................................................................................................................................ 21-22

FEATURES / BENEFITS

• Every compact one-piece unit arrives fully assembled, tested, and ready to run.
• Designed especially for high ambient environment.
• The drain pan is polyester powder coated for extra protection.
• Flexibility to provide left hand and right-hand coil connections.
• Metallic Blower double inlet forward curved blades.
• 3 speed motor.
• Standard galvanized sheet metal casing.
• Low unit height suitable for low false ceiling application.
• Washable aluminum filter.
• 6mm thickness internal insulation with 50 kg/m^3 density.
• Low noise level suitable for all application.
• Sweat connections for easy installation and maintenance.

Carrier’s 42TKS direct expansion fan coils are designed to cover low to medium range of air flow requirements.
They are compact and ready to fit in the under-ceiling application. All units come with solid-state fan controls,
6mm insulation, quiet multi-speed motors, and fully wet coils. 42TKS are designed for ease of service in under
ceiling applications. A carton template for easy location of mounting hardware simplifies installation. Coils are
made of aluminum fins mechanically bonded to copper tubes for superior heat transfer. Metallic blower double
inlet forward curved blades attached to 3-speed high efficiency motors. Galvanized sheet metal casing protects
against rust and drain pan is polyester powder coated for extra protection. The control board with the integrated
thermostat control and washable Aluminum filters are standard feature. Piping connections position (Right
Hand/Left Hand) is optional, and field interchangeable for various applications.

2
 MODEL NUMBER NOMENCLATURE

MODEL: 42 TKS – R410A Series

4 2 TKS 018 - 7 1 U C R 1

42 series
Fan coil units

Model
TK - Ducted Series
S - Slim Type

Size
018 - 18000 Btu/h
024 - 24000 Btu/h Factory Development Version
030 - 30000 Btu/h
036 - 36000 Btu/h Connection Side
037 - 36000 Btu/h L - Left Side
042 - 42000 Btu/h R - Right Side
048 - 48000 Btu/h
060 - 60000 Btu/h

Unit Type
Factory Assigned C - Cool Only

Country of Origin
U - UAE
Electrical Characteristics
7 = 230/1/50 Factory Assigned

3
 TECHNICAL DATA

42TKS Unit Size 18 24 30 36 37 42 48 60

Unit Size Tons 1.5 2.0 2.5 3.0 3.0 3.5 4.0 5
Motor
Rated Watts 80 125 200 250 300 500
Power
Number of Motors /
1 / 3 Speed
Speeds

Coil Tube Inner grooved Copper Tubes

Material
Fin Aluminum Fins with Louvered profile
Coil Face
m2 0.2 0.25 0.3 0.43 0.43 0.43 0.43 0.5
Area
Refrigerant
Orifice
Metering Device
Piston Size 46 57 57 68 68 68 78 90
Coil Connection
Soldered Connection
Type
Suction
Connection Inch 5/8 3/4 7/8
Size
Liquid
Connection Inch 3/8
Size
Drain
Connection Inch 3/4 NPT / GI Steel, Externally Threaded
Size
Blower Metallic Blower with Double Inlet, Forward Curved Blades
Filter Type 1” Washable Aluminum Filter
Filter Quantity 1 1 2 2 2 2 2 2
Filter Size mm 675 x 215 900 x 215 550 x 215 550 x 315 550 x 315 550 x 315 550 x 315 650 x 315
Sound Pressure
(H/M/L) @ ESP 0.2 46/43/38 50/45/39 52/45/39 53/51/48 53/51/48 54/53/50 56/54/52 57/54/53
in.wg at 1-meter
Unit Dimensions
Width mm 1040 1240 1440 1440 1440 1440 1440 1640
Depth mm 645

Height mm 275 375

Net Weight Kg 29 33 38 55 55 57 58 68
Gross
Kg 32 36 42 60 60 62 63 73
Weight

4
 UNIT DIMENSIONS

Notes:
1. The piping connections drain pan outlet and control box are located on the right-hand side facing the airflow
as factory standard. Left hand connection can be provided based on request.
2. Unit shall be installed for horizontal discharge. Suspend horizontally using the factory-provided holes
located at the topside flanges of the unit.

SUCTION LIQUID
Unit Model A B C D E F G H I J
LINE LINE
42TKS018-7 733 713 803 842 834 872 1040 275 216 197 5/8'' 3/8''
42TKS024-7 958 938 1028 1067 1059 1097 1240 275 216 197 5/8'' 3/8''
42TKS030-7 1158 1138 1228 1267 1259 1297 1440 275 216 197 3/4'' 3/8''
42TKS036-7 1158 1138 1228 1267 1259 1297 1440 375 316 297 3/4'' 3/8''
42TKS037-7 1158 1138 1228 1267 1259 1297 1440 375 316 297 3/4'' 3/8''
42TKS042-7 1158 1138 1228 1267 1259 1297 1440 375 316 297 7/8'' 3/8''
42TKS048-7 1158 1138 1228 1267 1259 1297 1440 375 316 297 7/8'' 3/8''
42TKS060-7 1358 1338 1428 1467 1459 1497 1640 375 316 297 7/8'' 3/8''
Note: Provided suction & liquid line sizes are for unit connection only; refer outdoor unit IOM for field pipe sizes.

5
 ELECTRICAL DATA

Voltage Fan
Unit Model Condenser Control Circuit Power Supply MCA MOCP
Min Max FLA
42TKS018-7 1.3 1.6 15
42TKS024-7 1.3 1.6 15
42TKS030-7 1.5 1.9 15
42TKS036-7 2.5 3.1 15
24V 230V/1Ph/50Hz 207 253
42TKS037-7 2.5 3.1 15
42TKS042-7 3.0 3.8 15
42TKS048-7 3.3 4.1 15
42TKS060-7 4.0 5.0 15

Legend
FLA — Full Load Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection

COMBINATION MATRIX

Outdoor Model Indoor Model Nominal Nominal

Nominal Air
Cooling Cooling
Flow (CFM)
Top Discharge Fan Coil Capacity (Btuh) Capacity (TR)
38CKM018-X-7 42TKS018-7 18000 1.5 600
38CKM024-X-7 42TKS024-7 24000 2.0 815
38CKM030-X-7 42TKS030-7 30000 2.5 890
38CKM036-X-7 42TKS036-7 36000 3.0 1165
38CKM036-X-9 42TKS037-7 36000 3.0 1165
38CKM042-X-9 42TKS042-7 42000 3.5 1350
38CKM048-X-9 42TKS048-7 48000 4.0 1425
38CKM060-X-9 42TKS060-7 60000 5.0 1765

For detailed performance and matchup ratings please refer to corresponding outdoor product catalog.

6
WIRING DIAGRAM

7
 FAN PERFORMANCE

42TKS Air Flow (CFM) – English

ESP - in.wg 0.1 0.2 0.3 0.4

Unit Model H M L H M L H M L H M L

42TKS018-7 673 600 438 621 543 392 536 473 320 438 360 242
42TKS024-7 990 815 477 936 747 432 853 679 365 761 585 261
42TKS030-7 1039 929 706 990 890 674 927 833 646 853 767 582
42TKS036-7 1316 1180 842 1296 1165 753 1262 1132 702 1200 1076 644
42TKS037-7 1316 1180 842 1296 1165 753 1262 1132 702 1200 1076 644
42TKS042-7 1436 1370 977 1415 1350 876 1382 1316 816 1303 1237 740
42TKS048-7 1629 1474 1286 1534 1425 1203 1492 1386 1160 1420 1326 1116
42TKS060-7 1940 1854 1618 1853 1765 1488 1804 1712 1434 1711 1613 1357

42TKS Air Flow (L/S) – SI

ESP - Pa 25 50 75 100
Unit Model H M L H M L H M L H M L
42TKS018-7 318 283 207 293 256 185 253 223 151 207 170 114
42TKS024-7 467 385 225 442 353 204 403 320 172 359 276 123
42TKS030-7 490 438 333 467 420 318 437 393 305 403 362 275
42TKS036-7 621 557 397 612 550 355 596 534 331 566 508 304
42TKS037-7 621 557 397 612 550 355 596 534 331 566 508 304
42TKS042-7 678 647 461 668 637 413 652 621 385 615 584 349
42TKS048-7 769 696 607 724 673 568 704 654 547 670 626 527
42TKS060-7 916 875 764 875 833 702 851 808 677 808 761 640

Legend:
CFM — Cubic feet per minute
L/S — Liter per second
in.wg — Inches of water gauge
Pa — Pascals
ESP — External static pressure
H — High speed, M — Medium speed, L — Low speed,

8
 OPTIONS AND ACCESSORIES

Connection Side Option

Standard coil connection and electric box position is Right Hand facing air flow direction while the optional
position is Left Hand facing the air flow for both coil connection and electric box. Customers can order this option
directly from the factory. Also, units are designed to be field exchangeable if needed in the field.

Control Board Wire Extension

Standard wire length for control board is 15m. Optional extensions are available to enlarge the wire up to 30 m. If
extension is required, please contact your local Carrier dealer.

GUIDE SPECIFICATIONS

COOLING ONLY DX INDOOR UNIT

SIZE: 1.5 TR TO 5.0 TR

SYSTEM DESCRIPTION
The direct expansion indoor units are designed for under ceiling installation, electrically controlled cooling. Unit
shall be horizontal installation.

QUALITY ASSURANCE
a) Units are designed / manufactured in accordance with ISO 9001:2015 facilities, International Standard for
Quality Systems.
b) Units are designed to conform to ASHRAE safety standard.
c) Units are rated in accordance with ISO 13253 testing standard at T1 and T3 conditions.
d) Insulation and adhesives are conforming to NFPA 90A requirements for flame spread and smoke
generation.
e) Units are run tested before packing.

DELIVERY STORAGE AND HANDLING

a) Unit shall be stored and handled per manufacturer’s recommendations.
b) Lifting by crane requires either shipping top panel or spreader bars.
c) Unit shall be stored or positioned in the upright position.

PRODUCT
a) The units are factory assembled single piece cooling units.
b) Unit cabinet shall be constructed of galvanized steel.
c) Standard ducted unit’s inner sections are insulated with NBR Elastomeric closed cell foam insulation,
50kg/m³ density.
d) Drain pan is polyester powder coated on both sides & insulated outside.
e) The unit fan wheel shall be directly connected to the motor. The fan wheel shall be dynamically
balanced with double inlet forward curved type blower wheel.
f) All coils are with 9.52mm seamless copper tubes and aluminum fins. Coil fins are mechanically
bonded to copper pipes.
g) The coil connections are sweat type LH/RH exchangeable.
h) The unit fan motors are with permanently lubricated sleeve bearing and 3 speeds. The motor shall
have internal overload protection and B class insulation.
i) Unit shall have a wired control board with a built-in thermostat to be installed in the air-conditioned
area and it shall have the following Features:
i. Control Modes – Cool, Dry, Fan, Auto Cool and Sleep mode.
ii. Compressor protections – 3 minutes restart protection.
iii. Indoor coil anti-freeze protection.
iv. Failure monitoring for room sensor and indoor coil sensor.
v. Non-volatile memory – keep system settings.
vi. Programmable On/Off timer.
vii. Random Restart Time Delay – to minimize voltage dip during compressor first cut in cycle
upon power up for multiple units’ operation.
j) All electric parts are easily accessible for service.

9
INSTALLATION & OPERATIONS INSTRUCTIONS

10
 SAFETY CONSIDERATIONS

The appliance is not to be used by persons (including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction.
Children should be supervised not to play with the appliance.
Improper installation, adjustment, alteration, service, maintenance or use can cause explosion, fire, electrical
shock or other conditions which may cause personal injury or property damage. Consult a qualified installer;
service agency must use factory-authorized kits or accessories when modifying this product. Refer to the
individual instructions packaged with the kits or accessories when installing. Follow all the safety codes. Wear
safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher
available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult
local building codes for special requirements. In absence of local codes, it is recommended that the USA standard
ANSI/NFPA 70, National Electrical Code (NEC), be followed.

It is important to recognize safety information. This is the safety-alert symbol . When you see this symbol on
the unit and in instructions or manuals, are alert to the potential for personal injury. Understand the signal words
DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER
identifies the most serious hazards which will result in severe personal injury of death. WARNING signifies
hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may
result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.

INSTALLATION SAFETY CONSIDERATIONS

After the unit has been received and when it is ready to be installed or reinstalled, it must be inspected for
damage. If damage is detected upon receipt, immediately file a claim with the shipping company or repair. This
machine must be installed in a location that is not accessible to the public and protected against access by non-
authorized people. This machine must not be installed in an explosive atmosphere.

Do not remove the skid or the packaging until the unit is in its final position. The units can also be lifted with
slings, using only the designated lifting points marked on the unit (labels on the chassis and a label with all unit
handling instructions are attached to the unit). Use slings with the correct capacity, and always follow the lifting
instructions on the certified drawings supplied for the unit.

Motors are permanently lubricated; use of any external lubricant (including WD40) is not allowed, For units
without factory supplied control it is the full responsibility of the user to install proper controls matching the unit’s
design and capable to carry components current, control wiring should be strictly follow local/national electrical
codes (i.e. using telephone wires or similar is prohibited). Safety is only guaranteed, if these instructions are
carefully followed. If this is not the case, there is a risk of material deterioration and injuries to personnel.

WARRANTY
Warranty is based on the general terms and conditions of the manufacturer. Any modifications to the design
and/or installation made without discussion with Carrier and without advance written agreement will result in the
loss of the right to any warranty claims and any claim for injury to personnel as a result of these modifications.

WARNING - THE MANUFACTURER'S WARRANTY DOES NOT COVER ANY DAMAGE OR DEFECT
TO THE AIR CONDITIONER CAUSED BY THE ATTACHMENT OR USE OF ANY COMPONENTS,
ACCESSORIES, OR DEVICES (OTHER THAN THOSE AUTHORIZED BY THE MANUFACTURER) INTO,
ONTO, OR IN CONJUNCTION WITH THE AIR CONDITIONER. YOU SHOULD BE AWARE THAT THE USE
OF UNAUTHORIZED COMPONENTS, ACCESSORIES, OR DEVICES MAY ADVERSELY AFFECT THE
OPERATION OF THE AIR CONDITIONER AND MAY ALSO ENDANGER LIFE AND PROPERTY. THE
MANUFACTURER DISCLAIMS ANY RESPONSIBILITY FOR SUCH LOSS OR INJURY RESULTING FROM
THE USE OF SUCH UNAUTHORIZED COMPONENTS, ACCESSORIES, OR DEVICES.

11
 RECEIVING

42TKS fan coil units are shipped individually packed in carton boxes. When cartons are individually off loaded
from the truck, do not roll, or throw, or drop the carton to avoid damage to the contents. Store boxes upright as
the symbols on the boxes indicated. Do not stack units more than 8 units high for sizes 018-024 and 6 units high
for sizes 030 - 060.

UNPACKING INSTRUCTIONS

1. Prepare unit for unpacking

2. Remove two (2) pieces, of plastic straps
3. Open carton flaps
4. Lift unit assembly carefully out of carton box

Unpacking Instructions

PACKING INSTRUCTIONS
1. Lift unit assembly and carefully place into the carton box.
2. Place the IOM
3. Close carton flaps and seal with tape along flap side, wrap with two (2) pieces of plastic straps around the
box

Packing Instructions

INSPECTION
Check the shipment against shipping list, remove unit from the carton and take off protective covering. If the unit
has been damaged, file claim with transportation company and notify Carrier immediately.

PROTECTION
Protect unit from damage caused by job site debris. Do not allow dust, debris and water to get into the unit. This
will damage unit’s component and unit’s performance will be affected.

PRELIMINARY CHECK
Following is a checklist which should be checked before the installation is started. The installer should be familiar
with each of the following requirements before the actual installation.

1. Space requirements and clearances.

2. Ceiling or mounting strength.
3. Piping connections.
4. Condensate drains connection.
5. Power supply and wiring.
6. Air duct connections.
7. The condensing unit model number is the recommended by the factory (as per “Combination Ratings and
Matrix”).

12
PREPARE JOBSITE FOR UNIT INSTALLATION
To save time and to reduce the possibility of costly errors, set up a complete sample installation in a typical room
at jobsite. Check all critical dimensions such as pipe, wire, and duct connection requirements. Refer to job
drawings and product dimension drawings as required. Instruct all trades in their part of the installation.

IDENTIFY AND PREPARE UNITS

Be sure power requirements match available power source. Refer to unit nameplate and wiring diagram.
1. Check all tags on unit to determine if shipping screws are to be removed. Remove screws as directed.
2. Rotate the fan wheel by hand to ensure that the fan is unrestricted and can rotate freely. Check for
shipping damage and fan obstructions.

UNIT CONFIGURATION
The piping connections drain pan outlet and control box are located on the right side of the unit facing the airflow
direction as factory standard as shown in the unit picture. Left hand side connection is a factory option. However,
the connections side can be relocated at site.

RIGGING AND UNPACKING

Unit should not be removed from carton until reaching final location to avoid damage. Inspect unit for shipping
damage and file claim with transportation company if necessary, check nameplate voltage against available
power supply. For special installation, consult local building and electrical codes.

INSTALLATION

PLACING UNIT IN POSITION

1. Select the unit location. Allow adequate space for free air circulation, service clearances, piping and
electrical connections, and any necessary ductwork.
2. Be sure that the ceiling can support the weight of the unit. See “Physical Data” for nominal unit weight.
3. Move unit into position. Ensure unit is level or pitched towards drain to ensure proper drainage and
operation.
4. Mounting units to the ceiling - When unit is lifted, access to the mounting holes is on the top panel of the
unit. Hanger rods, fasteners, and other required hardware must be field supplied.

PIPING CONNECTIONS
Qualified personnel in accordance with local and national codes must perform all piping connections. Refer to
“Physical Data” for piping connections. NOTE: It is important to have a common understanding of which side of
the unit is the right-hand side and which is the left-hand side. When facing the supply air outlet from the front of
the unit (air blowing in your face), your right hand will be on the right side of the unit and your left hand will be on
the left side of the unit. Use the condensing unit manufacturer's recommended line sizes and requirements; see
“Combination Ratings and Matrix”. Suction line must be insulated for correct operation. Use refrigerant-grade
copper lines only. The unit is not applied as a heat pump.

13
 Typical Wiring & Piping Connections

NOTES:
1. All piping must follow standard refrigerant piping techniques.
2. All wiring must comply with the applicable local and national electric codes.
3. Wiring and piping shown are general points-of-connection guides only not intended for a special
installation.
4. Insulate condensate line if run above a conditioned space.
5. The control board kit is factory supplied; no thermostat required.
6. The wall mounted wired room controller could control all system functions without wireless remote control.
7. Standard wire length for the control board is 7.5 m. If extension is required, please consult Carrier.

14
TEST AND INSULATE
When all joints are complete, perform hydrostatic test for leaks. Vent all coils at this time. Check interior unit
piping for signs of leakage from shipping damage or mishandling. If leaks are found, notify a Carrier
representative before initiating any repairs. Release trapped air from system (refer to Final Preparations section).

ELECTRICAL CONNECTIONS
Refer to unit nameplate for required supply voltage, fan amperage and required circuit amp. Refer to unit wire
diagram for unit and field wiring; see” Typical Wiring & Piping Connections”, “Typical Wiring Schematic” and
“Electrical Data”. Make sure all electrical connections are in accordance with unit wiring diagram and all
applicable codes. The fan motor(s) should never be controlled by any wiring or device other than the factory-
supplied control board. All field wiring must be in accordance with governing codes and ordinances. Any
modification of unit wiring without factory authorization will invalidate all factory warranties and nullify any agency
listings.

- Select proper wall location to fix display pad

- Connect communication cable end to its location in the PCB as shown in the wiring diagram.

Follow local/national wiring regulations and code for all wiring to the unit, in absence of local codes use power
supply wires sizes which are at least 1.25 times the unit’s full load current and circuit breaker size 2 - 2.25 times
the unit’s full load current.

DUCT CONNECTIONS
Install all ductwork to and from unit in accordance with all applicable codes. Duct construction must allow unit to
operate within duct external static pressure limits as shown on job submittals. Units designed to operate with
ductwork may be damaged if operated without intended ductwork attached. Units provided with outside air should
have some method of low-temperature protection to prevent freeze-up. Insulate ductwork as required. Use flexible
connections to minimize duct-to-unit alignment problems and noise transmission where specified. Set unit
markings for minimum clearance to combustible materials and first 3 ft of ductwork. Install ductwork, accessory
grilles and plenums so that they do not restrict access to filter. Cut openings for supply-air and return-air grilles.
Be careful not to cut wires, piping or structural supports.

Caution: Prevent dust and debris from settling in unit. If wall finish or color is to be spray applied, cover all
openings to prevent spray from entering unit. Unit efficiency will be reduced.

FINAL PREPARATIONS
1. Turn off power to the unit (open unit electrical disconnect).
2. Install the wired control panel kit and perform any other final wiring as applicable, see the controller for
ducted fan coil units’ section.
3. Clean dirt, dust, and other construction debris from unit interior. Be sure to check fan wheel and
housing.
4. Rotate fan wheel by hand to be sure it is free and does not rub housing. Check that wing nuts
securing fan assembly to fan deck are tight.
5. Be sure drain line is properly and securely positioned and that the line is clear. Pour water into drain to
check operation.

Important: Do not start-up or operate unit without filter. Be sure filter and unit interior are clean.

START-UP
42TKS unit is designed to operate in hot and humid conditions without condensation problem because of the
rubber insulated drain pan. Refer to the “Mandatory Startup Checklist and Record” for startup procedure.

15
 SERVICE

Warning: Failure to follow this caution may result in equipment damage. Motors are permanently lubricated;
Please do not use any external lubricant.

CLEAN COIL
1. Be sure electrical service switch is open, locked, and tagged while working on unit.
2. Coil can be cleaned by removing filter and bottom panel and brush between coil fins with stiff wire
brush. Follow-up by cleaning with vacuum cleaner. If coil is cleaned with air hose and nozzle, take
care not to drive dirt and dust into other components.

CHECK DRAIN
Lock open and tag unit electrical service switch. Check drain pan drain line and trap at start of each cooling
season. A standard type pipe cleaner for 3/4-in. ID pipe can be used to ensure that pipe is clear of obstruction so
that condensate is carried away.

CLEAN FAN WHEEL

Lock open and tag unit electrical service switch. For access to fan assembly, remove supply air duct and bottom
panel. Use a stiff brush or vacuum to remove dirt and debris from scroll. Wipe all fan surfaces with a damp cloth.

CLEAN OR REPLACE AIR FILTERS

Lock open and tag unit electrical service switch. At the start of each cooling season and after each month of
operation (depending on operating conditions) replace throwaway filter or clean permanent filter.

THROWAWAY FILTER
Replace filter with a good quality filter of the size shown in “Physical Data”. Do not attempt to clean and reuse
disposable filters.

PERMANENT FILTER
1. Tap on solid surface to dislodge heavy particles.
2. Wash in hot water.
3. Set filter on end so that water drains out through slots in frame. Allow filter to dry thoroughly. See Fig.8
for filter access.

16
 UNIT CONTROLLER

1.1 Functions:

- Modes: Cool, Dry and Fan.

- Fan Speed: High, Medium, Low.
- Sleep Mode, programmable On/Off timer.
- Compressor protections: Compressor 3-minute restart protection, Indoor coil anti-freeze, Room Sensor
and indoor coil sensor failure monitoring.
- Random restart to minimize voltage dip during compressor first cut in cycle upon power up.

1.2 Hardware Setting: A 2-way DIP switch is used to configure:

DIP Switch ON OFF

SW1 Cool OFF
SW2 - DX system

1.3 Error Code: The corresponding error code will be shown one after another, in-case if multiple faults.

Error code E1 E2 E4
Fault Room Sensor Indoor coil sensor Compressor

1.4 Description:

1) LCD Screen

17
2) Key Function:

3) System On/Off: Press to turn on or off the unit.

4) Mode: Press key to change operating mode as follow:

Cool Only Model: Cool – Dry – Fan
5) Fan Speed: Press key to select: Auto – High – Medium – Low which is indicated as A-3-2-1 on fan
speed digital setting. Fan key is invalid in Dry mode.
6) Temperature Setting: Press or key to adjust set temperature. Temperature setting is 20°C to
30°C or 68°F to 85°F. Temp keys are invalid in Fan mode. Press and key together to switch
between Celsius to Fahrenheit setting.
7) Sleep: Hold on key to toggle sleep mode setting. Sleep key is invalid in Fan or Dry mode.
Sleep mode will automatically cancel after 8 hours.

8) RTC: Press key to enter RTC setting. Press or key to adjust hour or minute.
Press key to select hour, minute or day of week. Press key to confirm and exit.

9) Timer On or Off: Press and keys to enter timer setting. Press key to change items
as follow: day of week, timer on enable or disable, timer on hour, timer on minute, timer off
enable or disable, timer off hour, timer off minute. (When hour or minute being selected, it will
flash).
Press or key to adjust the time for timer on or off being selected. Press key to confirm and
exit. Press key to exit and ignore setting. It will exit and ignore setting automatically 6 sec after last key
press. If timer ON is programmed ON symbol lights on. If timer off is programmed OFF symbol lights on.
If ON or OFF timer is available for current day of week, Timer symbol lights on.

10) Cancel Timer: Hold key for 3 seconds to cancel all timer settings.

11) Key Lock: In main menu, hold on and key to lock or unlock the keys. In key lock
mode only key is invalid.

12) Information Browsing: Press keys for 3 sec to browse the following temperature.
Press or key to browse the temperature. Press key to exit.
RTC Display Zone Temperature Display Zone
A1 Room Temperature
A2 Indoor Coil Temperature

18
 13) Error Code Display: Should there be any system error, it will be shown on temperature
display zone. If multiple faults happen at the same time, the corresponding error code will be
shown one after another.
Fault Error Code
Room sensor fault E1
Indoor coil sensor fault E2
Compressor fault E4
Communication fault E15

14) Edit System Parameter: Press and key enter password menu. Key in password
“1111” by or key to change selected digit.
Press key to select the password digit. Press key to verify the password. If password entry is
correct, RTC display area will show the submenu number.
Press or key to select the sub menu, press or key to adjust the value selected sub menu.

Press key to confirm and exit. Press key to exit and ignore setting.

Submenu Description Range Options

1: Disable Room Temp Display
A1 Temp display 1~2
2: Enable Room Temp Display
1: Compressor off; Fan On
A2 Cool mode fan control function 1~2
2: Compressor off; Fan off

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 TROUBLESHOOTING

Symptom Possible Causes Remedy

Power off or loose electrical
Check for correct voltage at contactor in condensing unit.
connection
Thermostat out of calibration-
Reset.
set too high
Check for control voltage at contactor coil - replace if
Unit will not run Defective contactor
contacts are open.
Blown fuses or Transformer
Replace fuses / Check wiring-replace transformer.
defective
High pressure control open (if Reset-also see high head pressure remedy-The high-
provided) pressure control opens at 650PSIG
Run or start capacitor defective Replace
Start relay defective Replace
Check for correct voltage at compressor check & tighten
Outdoor fan runs, Loose connection
all connections
compressor doesn't
Compressor stuck, grounded Wait at least 2 hours for overload to reset. Open internal
or opens motor winding. overload. If still open, replace the compressor.
Low voltage condition Add start kit components
Improperly sized unit Recalculate load
Improper indoor airflow Check, remove obstructions - clean filters if necessary
Insufficient cooling Incorrect refrigerant charge Charge per procedure attached to unit service panel
Air, non-condensable or
Recover refrigerant, evacuate & recharge, add filler drier.
moisture in system
At compressor terminals, voltage must be ±10% of
Incorrect voltage
Compressor short nameplate marking when unit is operating.
cycles Defective overload protector Replace, if external - check for correct voltage
Refrigerant undercharge Add refrigerant
Increase speed of blower or reduce restriction -clean air
Low indoor airflow
filters.
Indoor unit sweats
Assure condensate is draining properly & that insulation is
Improper indoor unit installation
dry.
High head-Low vapor Restriction in liquid line,
Remove or replace defective component.
pressures expansion device or filter drier
Dirty outdoor coil Clean coil
High head-high or
Refrigerant overcharge Correct system charge
normal vapor
pressure - Cooling Outdoor fan not running Repair or replace.
mode Air or non-condensable in
Recover refrigerant, evacuate & recharge
system
Low air flow - indoor coil Check filters - correct to speed
High head - high or
Refrigerant overcharge Check system charge
normal vapor
pressure - Heating Air or non-condensable in
Recover refrigerant, evacuate & charge
mode system
Dirty indoor coil Check filter - clean coil
Low head-high vapor
Defective Compressor valves Replace compressor
pressures
Low vapor - cool Low indoor airflow Increase speed. of blower or reduce restriction
compressor - iced
indoor coil Moisture in system clean air filter iced indoor coil
Excessive load Recheck load calculation
High vapor pressure
Defective compressor Replace
Fluctuating head & Air or non-condensable in
Recover refrigerant, evacuate & recharge
vapor pressures system
Gurgle or pulsing Air or non-condensable in
Recover refrigerant, evacuate & recharge
noise at expansion system

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 START-UP CHECK LIST

MANDATORY START-UP CHECK LIST AND RECORD

IMPORTANT!
This page is a mandatory checklist & record – the check to be executed and data to be recorded for future reference in
case of failure.
A copy of this checklist data must be submitted to Carrier representative. Completion of this checklist is a must for any
field claim, no field support will be provided for incomplete or blank checklists.
Preliminary Information
Outdoor Model Outdoor Serial
Number Number
Indoor Model Indoor Serial
Number Number
Technician
Startup Date
Name
Customer
Project Name
Name/Address
Additional Accessories

Pre-Start-Up Checklist Yes No NA

Outdoor Unit
Is there any shipping damage?
If the unit is damaged, please specify where:
Will this damage prevent the unit start-up?
Check power supply to see if it matches the unit data plate?
Has the ground wire been properly connected?
Are the circuit protection matched with the unit size and installed
properly?
Are the power wire gauge matched with the unit size and installed
properly?
Piping
Are both refrigerant lines flushed / cleaned, connected to service
valve sets and properly tightened?
Are all the service valves open and back seated?
Is the Stem Valves Installed and snug?
Have all the refrigerant connections and piping joints checked for
leaks and vacuum test conducted to 500 microns?
Indoor Fan Coil Unit Piping
Check accurate device size is matched and installed in fan coil unit?
(If Applicable)
Are the refrigerant connections properly connected and have been
checked for leakages?
Is condensate line connected?
Is the condensate line free from obstacle and drains freely?
Controls
Are control power lines connected to their control power terminal
block?
Are terminal snug in the housing?
Are control power lines and control cables routed separately (Not in
the same conduit and not in same multi-conductor cable?
Are control wires connected to the same circuit as associated
refrigerant lines?

Check to make sure the subbase mounting to wall is secure. (Don’t

apply excessive force to mounting screw)

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 Fan System
Does fan rotate freely?
Are air filters in place and clean?
Indoor Power Supply
Does the power supply match the fan coil unit data plate?
Is ground wire connected?
Start-Up Checklist Yes No NA
Check Indoor Fan Operation Under Ceiling Fan Coil Units
Select fan mode, then initiate test sequence. Does the fan motor
start at low speed, then shift to medium then to high?
Start System Operation at the Fan Coil Unit
Select cooling mode and adjust set point, it must be below current room temperature then
observe unit operation.
Does compressor start (After Initial Time Delay) and Run?
Does outdoor fan run properly?
After at least 15 minutes of running time, record all the information below:
Outdoor Unit Fan Coil Unit
Indoor
Unit Entering Air
Amps(L1/L2/L3) DB (Dry Bulb)
Temp
Indoor
Voltage Leaving Air
(L1/L2/L3) DB (Dry Bulb)
Temp
Indoor
Vapor Line Entering Air
Pressure WB (Wet
Bulb) Temp
Indoor
Vapor Line Leaving Air
Temp WB (Wet
Bulb) Temp
Liquid Line
Temp
Entering
Outdoor Air
Technician Name, Signature and Date:
Temp
Leaving
Outdoor Air
Temp

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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