Table of Contents
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40MKCF / 24AHA4 / 124ANS
40MKQF / 25HHA4 / 224ANS
Under Ceiling/Floor Console Ductless System
Sizes 18 to 54
TABLE OF CONTENTS
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DIMENSIONS
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SAFETY CONSIDERATIONS
Installing, starting up, and servicing air- -conditioning equipment
can be hazardous due to system pressures, electrical components,
and equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should
install, start- -up, and service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning coils. All other operations should be performed by
trained service personnel.
When working on the equipment, observe precautions in the
literature and on tags, stickers, and labels attached to the
equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep
quenching cloth and fire extinguisher nearby when brazing. Use
care in handling, rigging, and setting bulky equipment.
Read this manual thoroughly and follow all warnings or cautions
included in literature and
building codes and National Electrical Code (NEC) for special
requirements. Recognize safety information. This is the safety- -alert
symbol
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. When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal injury.
Understand these signal words: DANGER, WARNING, and
CAUTION. These words are used with the safety- -alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or 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.
Service Manual
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attached to the unit. Consult local
NOTE is used to highlight suggestions which will result in
enhanced installation, reliability, or operation.
PAGE
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ELECTRICAL SHOCK HAZARD
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Failure to follow this warning could result in personal
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injury or death.
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Before installing, modifying, or servicing system, main
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electrical disconnect switch must be in the OFF
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position. There may be more than 1 disconnect switch.
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Lock out and tag switch with a suitable warning label.
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EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Do not bury more than 36 in (914 mm) of refrigerant pipe
in the ground. If any section of pipe is buried, there must be
a 6 in (152 mm) vertical rise to the valve connections on the
outdoor units. If more than the recommended length is
buried, refrigerant may migrate to the cooler buried section
during extended periods of system shutdown. This causes
refrigerant slugging and could possibly damage the
compressor at start- -up.
INTRODUCTION
This service manual provides the necessary information to service,
repair, and maintain the MK family of air conditioners and heat
pumps. Section 2 of this manual is an appendix with data required
to perform troubleshooting. Use the Table of Contents to locate a
desired topic.
WARNING
WARNING
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
CAUTION
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Table of Contents
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Summary of Contents for Carrier 40MKCF
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Page 1: Table Of Contents
40MKCF / 24AHA4 / 124ANS 40MKQF / 25HHA4 / 224ANS Under Ceiling/Floor Console Ductless System Sizes 18 to 54 Service Manual TABLE OF CONTENTS NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. PAGE... -
Page 2: Model / Serial Number Nomenclatures
MODEL / SERIAL NUMBER NOMENCLATURES INDOOR UNIT --- --- 40= FAN COIL UNIT VOLTAGE MK = MODEL 3 = 208/230 ---1 ---60 SYSTEM TYPE C = COOLING ONLY Q = HEAT PUMP MAXIMUM NUMBER OF FAN COIL UNITS THAT CAN BE CONNECTED TO THE OUTDOOR UNIT NOT USED B=1:1 NOMINAL CAPACITY... -
Page 3: Standard Features And Accessories
STANDARD FEATURES AND ACCESSORIES INDOOR UNIT ACCESSORIES Table 1—Standard Features and Accessories Ease Of Installation Condensate Pump Indoor and Outdoor Compact Size Outdoor Unit Wall Mounting Kit Outdoor Unit Stacking Kit Indoor Mounting Bracket Comfort Features Convertible Under Ceiling - - Floor Console Microprocessor Controls Wireless Remote Control Automatic Air Sweep... -
Page 4: Specifications
SPECIFICATIONS Table 3—Specifications Cooling Only Under Ceiling Systems Cooling Only Only Size 24AHA418A003 24AHA424A003 24AHA430A003 24AHA436A003 24AHA436A005 24AHA436A006 24AHA448A003 24AHA448A005 24AHA448A006 Outdoor Model 124ANS018000 124ANS024000 124ANS030000 124ANS036000 124APS036000 124AES036000 124ANS048000 124APS048000 124AES048000 System Indoor Model 40MKCB18F- - - - 3 40MKCB34F- - - - 3 40MKCB34F- - - - 3 40MKCB34F- - - - 3... - Page 5 SPECIFICATIONS (CONT) Table 4—Specifications Heat Pump Under Ceiling Systems HEAT PUMP Size 25HHA430A003 25HHA436A003 25HHA436A005 25HHA436A006 25HHA448A003 25HHA448A005 25HHA448A006 Outdoor Model 224ANS030000 224ANS036000 224APS036000 224AES036000 224ANS048000 224APS048000 224AES048000 System Indoor Model 40MKQB36F--3 40MKQB36F--3 40MKQB36F--3 40MKQB36F--3 40MKQB48F--3 40MKQB48F--3 40MKQB48F--3 Energy Star Cooling Rated Btu/h 29,000...
- Page 6 DIMENSIONS - - INDOOR Unit: Bracket: Hook A0150266 Fig. 3 – 40MKCB**F, 40MKQB**F Unit and Bracket Dimensions Table 5—Dimensions Indoor Indoor Unit Size Height (H) Width (W) Depth (D) Operating Weight BTU/Hr in (mm) in (mm) in (mm) lb (kg) 9.3 (235) 42.0 (1068) 26.6 (675)
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Page 7: Dimensions 6
DIMENSIONS - - OUTDOOR Fig. 4 – Outdoor Unit Dimensions Table 6—Dimensions Indoor OPERATING Dimensions in (mm) WEIGHT UNIT Ibs. (kg) 31.1 36.9 14.6 23.4 17.2 23.1 28.1 11.3 24AHA418 (791) (938) (370) (406) (595) (437) (587) (713) (330) (168) (286) (16) (73) -
Page 8: Clearances
CLEARANCES - - INDOOR ≥35mm ≥1000mm A0150267 Fig. 5 – 40MKCB**F, 40MKQB**F Unit Clearance CLEARANCES - - OUTDOOR Air-outlet Air-inlet A08436 Fig. 6 – Outdoor Unit Clearance Table 7—Outdoor Clearances UNIT Coil Facing Wall - - in. (mm) Fan Facing Wall - - in. (mm) 24 (610) 24 (610) 24 (610) -
Page 9: Electrical Data
ELECTRICAL DATA Table 8—24AHA4/124ANS Electrical Data MAX FUSE** OPER VOLTS* COMPR UNIT SIZE - -- - V/PH voltage,series CKT BRK AMPS 18- -- -30 56.3 11.8 24- -- -30 62.9 10.9 14.1 30- -- -30 208/230/1 14.1 18.3 36- -- -30 14.1 18.8 48- -- -30... -
Page 10: Power And Connecting Cables
POWER AND CONNECTING CAUTION CABLES - - FIELD SUPPLIED Recommended Connection Method for Power and EQUIPMENT DAMAGE HAZARD Communication Wiring (To minimize Failure to follow this caution may result in equipment damage or improper operation. communication wiring interference) S Wires should be sized based on NEC and local codes. Power Wiring: S Use copper conductors only with a minimum 300 volt The main power is supplied to both, the indoor and the outdoor... -
Page 11: Connection Diagrams
CONNECTION DIAGRAMS A150280 Fig. 7 – 40MKCB**F/24AHA4 or 124ANS Connecting Diagram A150282 Fig. 8 – 40MKQB**F / 25HHA4 or 224ANS Connecting Diagram NOTE: 1. Do not use a thermostat wire for any connection between indoor and outdoor units. 2. All connections between the indoor and outdoor units must be as shown in Fig. 7 and 8. The connections are sensitive to polarity and results in a fault code. -
Page 12: Wiring Diagrams
WIRING DIAGRAMS Le gend: ....Model s pecific feature C AP: C apacitor C N 1: Live wire L 1/Null line L2 C N 2/3: Transformer interface C N 25:C ontrols signal interface(C ) C N 7: S ensor interface C N 20: Network module interface C N 12: Vertical s wing motor interface C N 13: horizontal s wing motor interface C N 10: D isplay board interface... - Page 13 Fig. 11 – 24AHA4/124ANS Wiring Diagram 208/230 - - 460V 3 Phase Legen d: ....Model spec ific fe ature CAP: Capac itor CN 1: Live w ire L1 /Null line L2 CN 2/ 3: Tr ansfor mer interface CN 25 :Contr ols signal interface(R /C) CN 7: Sens or interface...
- Page 14 OUTDOOR UNIT SCHEMATIC DIAGRAM Fig. 13 – 25HHA4/224ANS Wiring Diagram 208/230V 1 Phase Fig. 14 – 25HHA4/224ANS Wiring Diagram 208/230V 3 Phase...
- Page 15 Fig. 15 – 25HHA4/224ANS Wiring Diagram 460V 3 Phase...
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Page 16: Refrigeration Cycle Diagrams
REFRIGERATION CYCLE DIAGRAMS FIELD PIPING FLARE CONNECTION LIQUID COOLING EXPANSION SERVICE VALVE DEVICE HEAT HEAT EXCHANGER EXCHANGER (EVAPORATOR) (CONDENSER) SERVICE VALVE W/GAUGE PORT SUCTION LINE FLARE CONNECTION COMPRESSOR FIELD PIPING Fig. 16 Cooling Only FIELD PIPING FLARE CONNECTION LIQUID TWO PHASE COOLING LIQUID HTG HEATING... -
Page 17: Refrigerant Lines
REFRIGERANT LINES Metering Device The 40MKC(Q)*F unit uses a TXV. The outdoor unit uses a type General refrigerant line sizing: B accurator. The cooling metering device is installed with the 3. The outdoor units are shipped with a full charge of R410A indoor unit, while the heating metering device is installed with the refrigerant. -
Page 18: Sequence Of Operation
EVACUATE Manifold Gage BREAK VACUUM WITH DRY NITROGEN WAIT 500 microns Low side valve High side valve EVACUATE Charge hose Charge hose BREAK VACUUM WITH DRY NITROGEN Vacuum pump WAIT EVACUATE CHECK FOR TIGHT, DRY SYSTEM Low side valve (IF IT HOLDS DEEP VACUUM) A07361 Fig. -
Page 19: Troubleshooting
TROUBLESHOOTING For ease of service, the indoor unit is equipped with diagnostic code display LEDs in the indoor units. This diagnostic display is a This section provides the required flow charts to troubleshoot combination of flashing LEDs on the display panel or the front of the problems that may arise. - Page 20 1. --- Open or short circuit of T1 or T2 temperature sensor --- diagnosis and solution Error Code Malfunction conditions Indoor room temperature T1 and sensor evaporator temperature sensor T2 is abnormal Check the connec ons Check the connec ons between temperature between temperature Correct the connec ons.
- Page 21 2. --- EEPROM parameter error --- diagnosis and solution Error Code Malfunction conditions Indoor PCB main chip does not receive feedback from EEPROM chip. • Installation mistake Possible Causes • Defective PCB Troubleshooting: Shut off the power supply and turn it on 5 seconds later. Is it still displaying the error code? If the EEPROM chip is welded on main...
- Page 22 3. --- Water ---level alarm --- diagnosis and solution Error Code Malfunction conditions If the sampling voltage is not 5V, the LED displays the failure. • Wiring mistake • Water--- level switch faulty Possible Causes • Water pump faulty • Indoor PCB faulty Power off, then restart the unit 2 minutes Power off, then restart the unit 2 minutes later.
- Page 23 4. --- Refrigerant Leakage Detection --- diagnosis and solution (EC) Error Code Define the evaporator coil temp.T2 of the compressor just starts running as Tcool. In the beginning 5 Malfunction decision conditions minutes after the compressor starts up, if T2 <Tcool---35.6° F(Tcool---2° C) does not keep continuous 4 seconds and this situation happens 3 times, the display area shows “EC”...
- Page 24 DISASSEMBLY OF UNDER CEILING- -FLOOR CONSOLE INDOOR UNIT NOTE: All the operations should be performed after powered off. Parts name Procedures Remarks Remove the 1) Pull the grille locker till air outlet the screws appears, and grilles. release these screws. 2) Remove the air return grille (watch the lockers under the grilles).
- Page 25 Remove the 1) Release 2 screws fixing control the control box, and then take it out. 2) Screw off the 2 screws to remove the cover of the control box Fan Capacitor Main PCB Transformer Power cord terminal 3) Disconnect the fan motor wire, louver motor wire, room temperature and evaporator temperature...
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Page 26: Dissassembly
To Display board Temperature Swing motor control sensors T1, T2 5) Remove the PCB from the fixing pins Remove the 1) Remove the stickers fan motor stick to the volute shell and fan Stickers wheel 2) Remove the below volute shell Press Press the clips to take off the volute shell... - Page 27 4) Release the screws Take off the screw locking the fan wheel on to remove the fan the shaft, you can wheel remove the fan wheels. Remove the 1) Release the 2 screws Release the screw display (both sides) and push the panel upwards to remove Push it upwards 2) Release 11 screws (5 at...
- Page 28 5) Unplug the wires Remove the 1) Remove the drain pan vertical assembly swing Release the 2 screws motor 2) Remove the air outlet grille assembly by screwing of 8 screws release 8 screws 3) Release 2 screws fixing the swing motor to remove it Remove 2 1) Remove the motor...
- Page 29 2) Remove the evaporator Note: ** means there is no this part in some models.
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Page 30: Appendix
APPENDIX APPENDIX TABLE OF CONTENTS DESCRIPTION NUMBER Control Board Input/Output Values ............... Temperature Sensor Values (Temperature vs. - Page 31 Table 20 – Temperature Sensor Resistance Value Table for T5 K Ohm K Ohm K Ohm K Ohm - -20 - -4 542.7 68.66 13.59 3.702 - -19 - -2 511.9 65.62 13.11 3.595 - -18 62.73 12.65 3.492 - -17 455.9 59.98 12.21...
- Page 32 Table 21 – Temperature Conversion °C °F °C °F °C °F °C °F °C °F 69.8 123.8 179.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4 75.2 129.2 240.8 30.2 186.8 242.6 25.5 77.9 132.8 188.6 244.4 32.9 78.8 134.6...