Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Cooper & Hunter NORDIC MULTI LIGHT CHML-U21RK3
Summary of Contents for Cooper & Hunter NORDIC MULTI LIGHT CHML-U21RK3
- Page 1 NORDIC MULTI LIGHT SERIES Service manual Air conditioners Models: CHML-U21RK3 CHML-U24RK3 CHML-U28RK4 Thank you for choosing Cooper&Hunter air conditioner, please read this service manual carefully before operation and retain it for future reference.
-
Page 2: Table Of Contents
Service Manual Table of Contents Part Ⅰ : Technical Information ................1 1. Summary ..........................1 2. Specifications ........................2 3. Outline Dimension Diagram ................8 4. Refrigerant System Diagram ................9 5. Electrical Part .........................10 5.1 Wiring Diagram ........................10 5.2 PCB Printed Diagram ......................14 6. -
Page 3: Part Ⅰ : Technical Information
Service Manual Part Ⅰ : Technical Information 1. Summary Outdoor Unit CHML-U21RK3 CHML-U24RK3 CHML-U28RK4 Technical Information... -
Page 4: Specifications
Service Manual 2. Specifications CHML-U21RK3 Model Rated Voltage 220-240 Power Rated Frequency supply Phases Cooling capacity 6100 Heating capacity 6500 Cooling Power Input 1740 Heating Power Input 1600 Cooling Current Input 7.72 Heating Current Input 7.10 Rated Power Input 2.87 Rated Current 12.7 3.51... - Page 5 Service Manual Cross-sectional Area of Power Cable Conductor Recommended Power Cable(Core) Connection Pipe Connection Method Flare Connection Not Additional Gas Connection Pipe Length Connection Pipe Gas Additional Charge Outer Diameter of Liquid Pipe (Metric) Φ6 Outer Diameter of Gas Pipe (Metric) Φ9.52 Outer Diameter of Liquid Pipe (Metric) Outdoor...
- Page 6 Service Manual Model CHML-U24RK3 Rated Voltage 220-240 Power Rated Frequency supply Phases Cooling capacity 7100 Heating capacity 8500 Cooling Power Input 1.95 Heating Power Input 2200 Cooling Current Input 8.65 Heating Current Input 9.76 Rated Power Input 2870 Rated Current 12.7 3.64 3.86...
- Page 7 Service Manual Cross-sectional Area of Power Cable Conductor Recommended Power Cable(Core) Connection Pipe Connection Method Flare Connection Not Additional Gas Connection Pipe Length Connection Pipe Gas Additional Charge Outer Diameter of Liquid Pipe (Metric) Φ6 Outer Diameter of Gas Pipe (Metric) Φ9.52 Outer Diameter of Liquid Pipe (Metric) Outdoor...
- Page 8 Service Manual Model CHML-U28RK4 Rated Voltage 220-240 Power Rated Frequency supply Phases Cooling capacity 8000 Heating capacity 9500 Cooling Power Input 2300 Heating Power Input 2650 Cooling Current Input 10.2 Heating Current Input 11.76 Rated Power Input 3.58 Rated Current 15.88 3.48 3.58...
- Page 9 Service Manual Cross-sectional Area of Power Cable Conductor Recommended Power Cable(Core) Connection Pipe Connection Method Flare Connection Not Additional Gas Connection Pipe Length Connection Pipe Gas Additional Charge Outer Diameter of Liquid Pipe (Metric) Φ6 Outer Diameter of Gas Pipe (Metric) Φ9.52 Outer Diameter of Liquid Pipe Φ6...
-
Page 10: Outline Dimension Diagram
Service Manual 3. Outline Dimension Diagram (1)CHML-U21RK3 Unit:mm (2)Models:CHML-U24RK3 CHML-U28RK4 1001 Unit:mm Technical Information... -
Page 11: Refrigerant System Diagram
Service Manual 4. Refrigerant System Diagram outdoor indoor filter A heat exchanger filter outdoor heat exchanger 4-way valve B heat exchanger filter high pressure switch discharge silencer C heat exchanger discharge temperature sensor filter D heat exchanger gas -liquid separator filter A1:A－unit electronic expansion valve B1:B-unit electronic expansion valve C1:C-unit electronic expansion valve D1:D-unit electronic expansion valve... -
Page 12: Electrical Part
Service Manual 5. Electrical Part 5.1 Wiring Diagram ●Instruction Symbol Symbol Color Symbol Symbol Color Symbol Name White GREEN COMP Compressor Yellow Brown Grouding wire Blue YEGN Yellow/Green Black Violet Orange ● Outdoor Unit (1)Model:CHML-U21RK3 600007001217 Technical Information... - Page 13 Service Manual (2)Model:CHML-U24RK3 600007001277 Technical Information...
- Page 14 Service Manual (3)Model:CHML-U28RK4 600007001276 These circuit diagrams are subject to change without notice, please refer to the one supplied with the unit. Technical Information...
- Page 15 Service Manual Technical Information...
-
Page 16: Pcb Printed Diagram
Service Manual 5.2 PCB Printed Diagram ● Top view Terminal of compressor Low-pressure protection terminal High-pressure protection terminal Overload protection terminal of compressor Terminal of temperature sensor Electric heating terminal of chassis Electric heating terminal of compressor Terminal of outdoor fan 4-way valve terminal 2-way valve termina Circuit for interfaces... -
Page 17: Function And Control
Service Manual 6. Function and Control 1 Basic functions of the system 1.1 Cooling Mode 1.1.1 Cooling conditions and process: If the compressor is in stop status and start the unit for cooling operation, when one of the indoor units reaches the cooling operation condition, the unit start cooling operation;... -
Page 18: Protection Function
Service Manual 1.3.3 Outdoor fan control in heating mode The outdoor fan starts before 5s of the starting of compressor and then it will run in high speed for 40s; The fan shall run at every speed for at least 80s; When the compressor stops, the outdoor fan stops after 1min. - Page 19 Service Manual 2.4 Communication malfunction Detection of the quantity of installed indoor units: After 3min of energizing, if the outdoor unit does not receive the communication data of certain indoor unit, the outdoor unit will judge that indoor unit is not installed and will treat it as it is not installed. If the outdoor unit receives the communication data of that indoor unit later, the outdoor unit will treat that unit as it is installed.
-
Page 20: Part Ⅱ : Installation And Maintenance
Service Manual Part Ⅱ : Installation and Maintenance 7. Notes for Installation and Maintenance Safety Precautions: 10. If the power cord or connection wire is not long enough, please get the specialized power cord or connection wire Important! from the manufacture or distributor. Prohibit prolong the wire by yourself. -
Page 21: Safety Precautions For Installing And Relocating The Unit
Service Manual Safety Precautions for Installing and Relocating the Unit: To ensure safety, please be mindful of the following precautions. Warnings 1. When installing or relocating the unit, be sure to keep the refrigerant circuit free from air or substances other than the specified refrigerant. -
Page 22: Safety Operation Of Flammable Refrigerant
Service Manual Safety Operation of Flammable Refrigerant Qualification requirement for installation and maintenance man ●All the work men who are engaging in the refrigeration system should bear the valid certification awarded by the authoritative organization and the qualification for dealing with the refrigeration system recognized by this industry. If it needs other technician to maintain and repair the appliance, they should be supervised by the person who bears the qualification for using the flammable refrigerant. -
Page 23: Main Tools For Installation And Maintenance
Service Manual Main Tools for Installation and Maintenance 1. Level meter, measuring tape 2. Screw driver 3. Impact drill, drill head, electric drill 4. Electroprobe 5. Universal meter 6. Torque wrench, open-end wrench, inner hexagon spanner 7. Electronic leakage detector 8. -
Page 24: Installation Manual
Service Manual 8. Installation Manual Installation procedures Start installation Preparation before installation Read the requirements select installation Prepare tools for electric connection location Select indoor unit Select outdoor unit installation location installation location Install the support of outdoor unit Install wall-mounting frame, drill wall holes (select it according to the actual situation) Connect pipes of indoor... -
Page 25: Electrical Connections
Service Manual C HML-U 21R K3 C HML-U 24R K3 C HML-U 28R K4 8.1 Electrical Connections Handle 21/24K 1. Remove the handle at the right side plate of the outdoor unit (one screw). 2. Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and fix the To unit A To unit B... - Page 26 Service Manual 1. Remove the handle at the right side plate of the outdoor unit An all-pole disconnection switch having a contact (one screw). separation of at least 3mm in all pole should be connected in fixed wiring. 2. Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and fix the connection.
-
Page 27: Installing The Outdoor Unit
Service Manual 8.2 Installing the Outdoor Unit Install the drain fitting and the drain hose(for Do not install the outdoor unit in pits or air vents model with heat pump only) Condensation is produced and flows from the outdoor unit When mounting the unit on a wall or the roof, make sure the when the appliance is operating in the heating mode. -
Page 28: Installation Dimension Diagram
Service Manual 8.3 Installation Dimension Diagram Use suitable instruments for the refrigerant R32. ● Do not use any other refrigerant than R32. Do not use mineral oils to clean the unit. The installation must be done by trained and qualified service personnel with reliability according to this manual. Contact service center before installation to avoid the malfunction due to unprofessional installation. -
Page 29: Check After Installation
Service Manual 8.4 Check after Installation Check Items Problems Owing to Improper Installation Is the installation reliable? The unit may drop, vibrate or make noises May cause unsatisfactory cooling (heating) Has the gas leakage been checked? effect Is the thermal insulation of the unit May cause condensation and water dropping sufficient? May cause condensation and water dropping... -
Page 30: Maintenance
Service Manual 9. Maintenance 9.1 Precautions before Performing Inspection or Repair There are high-capacity electrolytic capacitors on the outdoor mainboard. Thus, even the power is cut off, there is high voltage inside the capacitors and it needs more than 20min to reduce the voltage to safety value. Touching the electrolytic capacitor within 20min after cutting the power will cause electric shock. -
Page 31: Flashing Led Of Indoor/Outdoor Unit And Primary Judgement
Service Manual 9.2 Flashing LED of Indoor/Outdoor Unit and Primary Judgement 1. Requirement of malfunction display When several malfunctions happen at the same time, malfunction codes will be displayed circularly. 2. Malfunction display method (1) Hardware malfunction: it will be displayed immediately, please refer to “Malfunction status sheet”; (2) Operation status: it will be displayed immediately, please refer to “Malfunction status sheet”;... -
Page 32: Malfunction Checking And Elimination
Communication failure with Unit A Communication failure with Unit A Communication failure with Unit B Communication failure with Unit B Service Manual Communication failure with Unit C Communication failure with Unit C Communication failure with Unit D Communication failure with Unit D Unit A freeze protection Unit A freeze protection Viewing malfunction code... - Page 33 Service Manual Energize the unit Please check: 1. if the indoor and outdoor heat exchanges are dirty, if there is obstacle to affect the radiation; 2. if the indoor and outdoor fans are running normally; If the above cases are existed? 3.
- Page 34 Service Manual 2. PFC protection malfunction, capacity charging malfunction Main checking points: If the wiring of the induction is connected well and if the induction is broken; If the mainboard is broken; Flow chart: For 21/24/28K For 14/18K Start Start Check if power supply is normal Check If the power supply is normal Turn on the unit...
- Page 35 Service Manual 3. Compressor desynchronizing malfunction Main checking points: If the pressure of the system is too high; If the eletric expansion valve is working normally or it is broken; If the radiation of the unit is good; Flow chart: The unit appears desynchronizing as soon as energizing and starting The stop duration of the compressor is longer...
- Page 36 Service Manual Desynchronizing happens during operation Check if fan Replace the fan capacitor Outdoor unit is working? terminal is connected well Improve radiation situation of the unit Unit radiation is good? (such as cleaning Replace the outdoor unit the heat exchanger, improve ventilation Turn on the unit after the power...
- Page 37 Service Manual 4. Compressor overload, diacharge protectionmalfunction Main checking points: If the eletric expansion valve is connected well or it is broken; If there is refrigerant leakage; If the overload protector is broken; Flow chart: Start If the overload protector is connected well? Check the resistance between the two ends of the overload protector in ambient temperature, if the resistance is below 1k...
- Page 38 Service Manual 5. Start failuremalfunction Main checking points: If the connection wire of the compressor is connected properly; If the stop duration of the compressor is sufficient; If the compressor is broken; If the refrigerant charging amount is too much; Flow chart: Energize and start the unit...
- Page 39 Service Manual 6. Temperature sensor malfunction Main checking points: If the temperature sensor is damaged or broken If the terminal of the temperature sensor is loosended or not connected; If the mainboard is broken; Flow chart: Start Check whether the wiring terminal between temperature sensor and controller is loosened or poorly contacted? Insert the temperature...
- Page 40 Service Manual 7. DC fan malfunction Main checking points: If the outdoor fan is blocked by foreign objects; The connection wire of DC fan is connected reliably? If it is loose? Flow chart: Start Turn on the unit Check if the after removing the outdoor fan is blocked by foreign objects...
- Page 41 Service Manual 8. Communication malfunction Main checking points: If the connection wire between the indoor unit and outdoor unit is connected well, if the wires inside the unit is connected well; If the indoor mainboard or outdoor main board is broken; Flow chart: Communication malfunction of some indoor units...
- Page 42 Service Manual All the indoor units appear communication malfunction De-energize,check if the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Eliminate the malfunction Connected correctly? the wiring diagram De-energize, check if the connection wire between the outdoor mainboard and the filter board according to the wiring diagram...
- Page 43 Service Manual 9. Anti-high temperatureand overload malfunction Main checking points: If the outdoor ambient temperature is within the normal range; If the indoor fan and outdoor fan are running normally; If the indoor and outdoor radiation environment is good; Flow chart: Start It is a normal protection, please If the outdoor ambient temperature...
-
Page 44: Maintenance Method For Normal Malfunction
Service Manual 9.4 Maintenance Method for Normal Malfunction 1. Air Conditioner Can't be Started Up Possible Causes Discriminating Method (Air conditioner Status) Troubleshooting Confirm whether it's due to power failure. If yes, No power supply, or poor After energization, operation indicator isn’t bright wait for power recovery. - Page 45 Service Manual 4. ODU Fan Motor Can't Operate Possible causes Discriminating method (air conditioner status) Troubleshooting Connect wires according to wiring diagram to Wrong wire connection, or poor Check the wiring status according to circuit make sure all wiring terminals are connected connection diagram firmly...
-
Page 46: Exploded View And Parts List
Service Manual 10. Exploded View and Parts List The component picture is only for reference; please refer to the actual product. Installation and Maintenance... - Page 47 Service Manual Part Code Description CHML-U21RK3 Front grill 22413045 Front Panel 01535013P Chassis Sub-assy 017000000242 Drainage Connecter 06123401 Compressor and fittings 00103919G Compressor Gasket 76710247 Gas-liquid Separator Assy 07225017 Inhalation Tube 035006000845 Right Side Plate 01303268P Valve support assy 071302391 Cut off Valve 07130239 Cut off Valve...
- Page 48 Service Manual The component picture is only for reference; please refer to the actual product. Installation and Maintenance...
- Page 49 Service Manual Part Code Description CHML-U24RK3 Front Grill 22413048 Cabinet 01435004P Left Handle 26235401 Front Side Plate 01305086P Electrical Heater (Chassis) 7651000411 Drainage Connecter 06123401 Chassis Sub-assy 02803280P Gas-liquid Separator Assy 07225017 Compressor and Fittings 00105273 Electric Heater(Compressor) 7651873215 Tube Connector Sub-assy 06643008 4-Way Valve Assy 03073181...
- Page 50 Service Manual The component picture is only for reference; please refer to the actual product. Installation and Maintenance...
- Page 51 Service Manual Part Code Description CHML-U28RK4 Front Grill 22413048 Cabinet 01435004P Left Handle 26235401 Front Side Plate 01305086P Electrical Heater (Chassis) 7651000411 Drainage Connecter 06123401 Chassis Sub-assy 02803280P Gas-liquid Separator Assy 07225017 Compressor and Fittings 00105273 Electric Heater(Compressor) 7651873215 Tube Connector Sub-assy 06643008 4-Way Valve Assy 03073181...
-
Page 52: Removal Procedure
Service Manual 11. Removal Procedure Warning: Be sure to wait for a minimum of 20 minutes after turning off all power supplies and discharge the refrigerant completely before removal. NOTE:Only cut-off valve of valve support, electronic expansion valve and coil have some differences Steps Procedure 1. - Page 53 Service Manual Step rocedure 4. Remove front grille Remove the connection screws connecting the front grille and the front panel, and then loosen the clasp to remove the front grille. grille 5. Remove front panel Remove the screws connecting the front panel and then remove the front panel.
- Page 54 Service Manual Step rocedure 7. Remove rear grill rear grill Remove the screws connecting the rear grill and the left side plate, and then remove the rear grill. 8. Remove left side plate Remove the screws fixing the left side plate with the chassis and the condenser support, and then remove the left side plate.
- Page 55 Service Manual Step rocedure 10. Remove axial flow blade Remove the nut on the blade and then remove the axial flow blade. axial flow blade 11. Remove motor and motor support Remove the 4 tapping screws fixing the motor and disconnect the leading wire insert of the motor.
- Page 56 Service Manual Step rocedure 13. Remove PFC induction Remove the screw connecting the PFC induction and middle isolation sheet, and then remove the PFC induction PFC induction 14. Remove 4-way valve assy and suction pipe sub-assy 4-way valve assy Unsolder the welding joint connecting the 4-way valve assy with compressor suction and discharge port, the valve with the outlet pipe of condenser.
- Page 57 Service Manual Step rocedure 16. Remove middle isolation sheet Remove the screws connecting the middle isolation sheet with the chassis assy and the condenser assy, and then remove the middle isolation sheet. middle isolation sheet 17. Remove compressor compressor Remove the 3 foot nuts fixing the compressor and then remove the compressor.
- Page 58 Service Manual Step rocedure 19. Remove electronic expansion valve assy Unsolder the welding joint connecting the electronic expansion valve sub-assy with the gas collection pipe, and then remove the electronic expansion valve assy. (Note: when unsoldering, wrap the gas valve with a wet cloth completely to avoid damage to the valve caused by high temperature).
- Page 59 Service Manual 24/28K NOTE:Only cut-off valve of valve support, electronic expansion valve and coil have some differences Steps Procedure 1. Remove valve cover and top panel valve cover Twist off the screws used for fixing and valve cover , pull v alve cover up ward to remove it. Remove the 3 screws connecting the top top panel panel with the front panel and the right side...
- Page 60 Service Manual Remove the 5 screws connecting the panel with the chassis and the motor support, and then remove the panel. panel 3. Remove right side plate and left side plate right side plate Remove the scre ws connecting the right side plate with the chassis, the valve support and the electric box, and then remove the right side plate assy .
- Page 61 Service Manual 4. Remove fan motor and axial flow blade axial flow blade Remove the nuts fixing the blade and then remove the axial flow blade. fan motor fixing frame Remove the 4 tapping screws fixing the motor; disconnect the leading wire insert of the motor and then remove the motor.
- Page 62 Service Manual 6.Remove soundproof sponge and 4-way valv e assy soundproof sponge Since the piping ports on the soundproof sponge are torn easily, remove the soundproof sponge carefully 4-way valv e assy Discharge the refrigerant completely;unsolder the pipelines connecting the compressor and the condenser assy,and then remove the 4-way valve assy.
- Page 63 Service Manual 8. Remov e Cut off Valve and Valve Support Remove the 2 bolts fixing the valve subassemblies. Unsolder the welding joint connecting the gas valve and the return air pipe. Remove the gas valve. (Note: When unsoldering the soldering joint, wrap the gas valve with wet cloth completely to avoid damage valve support to the valve caused by high temperature.)
- Page 64 Service Manual condenser sub-assy 11.Remove condenser sub-assy Remove the chassis sub-assy and condenser sub-assy. chassis sub-assy Installation and Maintenance...
-
Page 65: Appendix
Service Manual Appendix: Appendix 1: Reference Sheet of Celsius and Fahrenheit Conversion formula for Fahrenheit degree and Celsius degree: Tf=Tcx1.8+32 Set temperature Fahrenheit Fahrenheit Fahrenheit display Fahrenheit display Fahrenheit display Fahrenheit Celsius （℃） Celsius （℃） Celsius （℃） （℉） （℉） （℉） temperature temperature temperature... -
Page 66: Appendix 3: Pipe Expanding Method
Service Manual Appendix 3: Pipe Expanding Method Pipe Note: Pipe cutter Improper pipe expanding is the main cause of refrigerant leakage.Please expand the pipe according to the following steps: Leaning Uneven Burr A:Cut the pip ● Confirm the pipe length according to the distance of indoor unit and outdoor unit. ●... -
Page 67: Appendix 4: List Of Resistance For Temperature Sensor
Service Manual Appendix 4: List of Resistance for Temperature Sensor Resistance Table of Ambient Temperature Sensor for Indoor and Outdoor Units(15K) C) Resistance(kΩ) C) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Temp( Temp( Temp( Temp( 138.1 18.75 3.848 1.071 128.6 17.93 3.711 1.039 121.6 17.14 3.579 1.009... - Page 68 Service Manual Resistance Table of Tube Temperature Sensors for Indoor and Outdoor (20K) C) Resistance(kΩ) C) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Temp( Temp( Temp( Temp( 181.4 25.01 5.13 1.427 171.4 23.9 4.948 1.386 162.1 22.85 4.773 1.346 153.3 21.85 4.605 1.307 20.9 4.443 1.269 137.2...
- Page 69 Service Manual Resistance Table of Discharge Temperature Sensor for Outdoor(50K) C) Resistance(kΩ) Resistance(kΩ) C) Resistance(kΩ) Resistance(kΩ) Temp( Temp( Temp( Temp( 853.5 18.34 4.75 799.8 93.42 17.65 4.61 89.07 16.99 4.47 703.8 84.95 16.36 4.33 660.8 81.05 15.75 4.20 620.8 77.35 15.17 4.08 580.6...
Need help?
Do you have a question about the NORDIC MULTI LIGHT CHML-U21RK3 and is the answer not in the manual?
Questions and answers