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Table of Contents
Related Manuals for Midea MSC-21CRN1
Summary of Contents for Midea MSC-21CRN1
- Page 1 Cover MSC-21CRN1; MSC-21HRN1 MSC-24CRN1; MSC-24HRN1 MSC-28CRN1; MSC-28HRN1...
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Page 2: Table Of Contents
Pumping down (Re-installation) ....................14 Re-air purging (Re-installation) ....................15 Balance refrigerant of the 2-way, 3-way valves................ 16 Evacuation ..........................17 Gas charging ........................... 18 Pressure table ......................19 MSC-21CRN1.......................... 19 MSC-21HRN1.......................... 19 MSC-24CRN1.......................... 19 MSC-24HRN1.......................... 19 MSC-28CRN1.......................... 20 MSC-28HRN1.......................... 20 Capacity table ...................... - Page 3 Content 10.5 MSC-28CRN1.......................... 23 10.6 MSC-28HRN1.......................... 23 Electronic function ....................24 11.1 Proper symbols and their meaning ..................24 11.2 Function ........................... 24 11.3 Protection..........................24 11.4 Fan-only mode......................... 25 11.5 Cooling mode........................... 25 11.6 Dehumidifying mode ........................ 27 11.7 Heating mode ..........................
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Page 5: Precaution
Service manual 1. Precaution 1.1 Safety Precaution To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first. 1.2 Warning Installation Moisture may condense and wet or damage furniture. - Page 6 Service manual failure. Operational When the product is soaked (flooded or submerged), contact an Authorized service center. Do not expose the skin directly to cool air for long There is risk of fire or electric shock. periods of time. (Do not sit in the draft). Be caution that water could not enter the product.
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Page 7: Function
Service manual 2. Function Indoor unit Operation ON/OFF by remote controller Sensing by room temperature Room temperature sensor. Pipe temperature sensor. Room temperature control Maintain the room temperature in accordance with the setting temperature. Starting temperature control Anion (Optional) Indoor fan is delayed for 5 sec at the starting. Time Delay Safety control Tele Remote control (Optional) Restarting is for approx. - Page 8 Service manual Outdoor unit Power relay control The unit has 3 mins delay between continuously ON/OFF operations. Low ambient kit The unit can operate in cooling mode at low ambient temperature conditions. Low noise air flow system Bird tail propeller fan makes the outdoor unit run more quietly. Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode.
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Page 9: Dimension
Service manual 3. Dimension 3.1 Indoor unit Dimension Mode 1080 1080 1080 3.2 Outdoor unit Dimension Mode... -
Page 10: Refrigerant Cycle Diagram
Service manual 4. Refrigerant cycle diagram Cooling only Heat pump mode... -
Page 11: Operation Limits
Service manual 5. Operation limits 6.1 Cooling operation Outdoor unit air temp.℃ DB Indoor air temp. ℃ DB Note: The chart is the result from the continuous operation under constant air temperature conditions. However, excludes the initial pull-down stage. 6.2 Heating operation Indoor air temp. -
Page 12: Schematic Diagram And Wiring Diagram
Service manual 6. Schematic diagram and Wiring diagram 7.1. Schematic diagram... - Page 13 Service manual...
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Page 14: Wiring Diagram
Service manual 7.2. Wiring diagram 7.2.1 MSC-21CRN1, MSC-24CRN1, MSC-28CRN1... - Page 15 Service manual 7.2.2 MSC-21HRN1, MSC-24HRN1, MSC-28HRN1...
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Page 16: Installation Details
Service manual 7. Installation details Wrench torque sheet for installation Outside diameter Torque inch Kg.m φ9.52 φ12.7 φ15.88 φ19.05 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Grade Unit Pipe length and the elevation Max. -
Page 17: Air Purging Of The Piping And Indoor Unit
Service manual Air purging of the piping and indoor unit Required tools: Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector. Note: The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit. -
Page 18: Pumping Down (Re-Installation)
Service manual Pumping down (Re-installation) Procedure 1. Confirm that both the 2-way and 3-way valves are set to the opened position. Remove the valve stem caps and confirm that the valve stems are in the opened position. Be sure to use a hexagonal wrench to operate the valve stems. 2. -
Page 19: Re-Air Purging (Re-Installation)
Service manual Re-air purging (Re-installation) Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the closed position. 2. Connect the charge set and a charging cylinder to the service port of the 3-way valve. Leave the valve on the charging cylinder closed. 3. -
Page 20: Balance Refrigerant Of The 2-Way, 3-Way Valves
Service manual Balance refrigerant of the 2-way, 3-way valves Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the open position. 2. Connect the charge set to the 3-way valve’s service port. Leave the valve on the charge set closed. Connect the charge hose with the push pin to the service port. -
Page 21: Evacuation
Service manual Evacuation Procedure: 1. Connect the vacuum pump to the charge set’s centre hose. 2. Evacuation for approximately one hour. Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less]. 3. Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump). -
Page 22: Gas Charging
Service manual Gas charging Procedure: 1. Connect the charge hose to the charging cylinder. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. 2. Purge the air from the charge hose. Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant). -
Page 23: Pressure Table
8. Pressure table Note: The pressure data is from 3 way valve, the pressure data are pressure above atmosphere. D: Dry bulb temp. W: Wet bulb temp. 9.1 MSC-21CRN1 Cooling mode Outdoor temperature (Dry bulb temp) Indoor Conditions Pressure 25ºC 30ºC... -
Page 24: Msc-28Crn1
Service manual Heating mode OUTDOOR CONDITIONS 12ºC D 7ºC D 0ºC D -4ºC D -7ºC D -15ºC D Indoor Conditions Pressure 11ºC W 6ºC W -1ºC W -6ºC W -9ºC W -xºC W 15ºC Pressure( kg/cm 28.4 27.2 21.6 20.8 20.4 18ºC Pressure( kg/cm... -
Page 25: Capacity Table
Service manual 9. Capacity table 10.1 MSC-21CRN1 SUMMER OUTDOOR TEMPERATURE DRY Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC Total capacity kW 5.73 5.58 5.43 4.94 4.81 4.59 21ºC D Sensitive capacity kW 4.49 4.30 4.22 4.00 3.87 3.65 15ºC W Input kW. -
Page 26: Msc-24Crn1
Service manual 10.3 MSC-24CRN1 SUMMER OUTDOOR TEMPERATURE DRY Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC Total capacity kW 6.55 6.37 6.21 5.64 5.49 5.24 21ºC D Sensitive capacity kW 5.13 4.91 4.83 4.57 4.42 4.17 15ºC W Input kW. 1.97 2.21 2.40... -
Page 27: Msc-28Crn1
Service manual 10.5 MSC-28CRN1 SUMMER OUTDOOR TEMPERATURE DRY Indoor Conditions 25ºC 30ºC 35ºC 40ºC 45ºC 50ºC Total capacity kW 7.64 7.44 7.25 6.58 6.41 6.12 21ºC D Sensitive capacity kW 5.99 5.73 5.63 5.34 5.16 4.87 15ºC W Input kW. 2.29 2.58 2.80... -
Page 28: Electronic Function
Service manual 10. Electronic function 11.1 Proper symbols and their meaning T1: Indoor ambient temperature T2: Indoor evaporator temperature T3: Outdoor condenser temperature TS: Setting temperature through the remote controller : Self-protection amp of compressor, continue three seconds until turns off the compressor. 3sec : Self-protection amp of compressor, continue five minutes until turns off the compressor. -
Page 29: Fan-Only Mode
Service manual 11.3.4 The current protection of the compressor If compressor turns off for continuously 4 times due to current protection in 10 minutes from Compressor On, the unit stops and LED displays failure information and can’t returns to normal operation automatically. 11.3.5 The protection of outdoor unit The protection of outdoor unit mostly contains: the protection of exhausting temperature, the protection of exhausting press etc. - Page 30 Service manual...
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Page 31: Dehumidifying Mode
Service manual Auto fan at cooling mode: Anti-freezing control to indoor evaporator at cooling mode ( T: evaporator temp. ) Compressor and outdoor fan on EVAP. temp. down EVAP. temp. up Compressor and outdoor fan off (after 4 mins) Condenser high temperature protection (cooling only type don’t have the protection): This protection only runs in cooling mode, cooling in auto mode and turbo mode The condition of this protection: Comp act... - Page 32 Service manual valve must delay 2 minutes compared with compressor if the compressor changed into non-heating mode or turned off. 4-way valve doesn't delay in dehumidifying mode 11.7.2 Generally, the outdoor fan is turned off with the on-off action of compressor in heating mode, except for the defrosting mode or the end of defrost 11.7.3 Action of compressor and outdoor fan motor at heating mode: compressor must run for 4 minutes after starting and then judge temperature.
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Page 33: Defrosting Mode(Available For Heating Mode)
Service manual 11.7.5 Auto wind at heating mode (T=indoor temp.) Low fan Room temp. down Room temp. up Med fan T-Ts 11.7.6 Indoor evaporator high-temperature protection at heating mode Comp off Out fan off Compressor, Out fan low out fan off TE15 Compressor on Out fan on (high) -
Page 34: Auto Mode
Service manual Defrost 10 minutes Compressor 4-way valve Outdoor fan Indoor fan 11.9 Auto mode 11.9.1 The air conditioner automatically selects one of the following operation modes: cooling, heating or fan only according to the temperature difference between room temperature (TA) and set temperature (TS). -
Page 35: Auto Restart Function
Service manual the fan speed is kept at low speed. The total time is 7 hours, after 7 hours the unit stops 11.11.3 Heating: The set temperature decrease 1℃ per hour. Two hours later, the set temperature will maintain as a constant and the air circulation is kept at low speed (Anti-cold function takes precedence over all). -
Page 36: Model And Parameters
Service manual 11. Model and Parameters Model MSH-21CRN1 MSH-21HRN1 MSH-24CRN1 MSH-24HRN1 MSH-28CRN1 MSH-28HRN1 I3SEC I5MIN IFAN IRESTORE IDEFROST 25℃ 25℃ 25℃ 32℃ 32℃ 32℃ 30℃ 30℃ 30℃ 20℃ 20℃ 20℃ 2℃ 2℃ 2℃ 2℃ 2℃ 2℃ 12℃ 12℃ 12℃ 12℃ 12℃... -
Page 37: Troubleshooting
Service manual 12. Troubleshooting 13.1 Display board Signal receptor AU TO indicator Thi s indicator illuminates whe n the air conditioner i s in AUTO operation. DE FROST indicator (F or Cooling & H eating mo dels only) Thi s indicator illuminates whe n the air conditioner starts defrostin g automati cally or when the warm air control fea ture is activated in he ating oper ation. -
Page 38: Detailed Malfunction Analyse
Service manual 13.3 Detailed malfunction analyse Cur r ent protectio n (LED indi cates) Check t he indoor air filt er. Check the out door condenser. Che ck t he positio n If wro ng, t he unit w ill and wiring of tem p result in current sen sor (all of the m). - Page 39 Service manual T he unit does not o per ate Ye s Does the power LED C hec k t he elect rical Per f orm Do th e LED lamps light af ter turning so urce. the related indicat es ERR? the switch on? inst ruct io ns.
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Page 40: Malfunction Stat
Service manual 13.4 Malfunction Stat. PROBLEM CAUSE REMEDY Power failure Check the power cord. Wiring failure Check the wiring. Replace the terminates or wires if failure. Not operating Check the input and the output on transformer. Replace if Transformer failure failure. - Page 41 Service manual PROBLEM CAUSE REMEDY Temperature sensor Open or short Replace after checked failure. circuit of outdoor failure Connector failure or loose Repair or replace the sensor. temperature Outdoor PCB failure Replace after checked failure. sensor Room temp or Temperature sensor Replace after checked failure.
- Page 42 Service manual PROBLEM CAUSE REMEDY LED failure Replace the display if checked failure. No display on Remote control shut the indoor unit. Push the button to turn the display on. display No power Check the voltage. Call an electrician if not within the limit. Wiring Check the terminals.
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Page 43: Characteristic Of Temperature Sensor
Service manual 14 Characteristic of temperature sensor Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ 62.2756 14.6181 4.3874 58.7079 13.918 4.2126 56.3694 13.2631 4.0459 52.2438 12.6431 3.8867 49.3161 12.0561 3.7348 46.5725 11.5 3.5896 10.9731 3.451 41.5878 10.4736 3.3185 39.8239 3.1918 37.1988 9.5507...
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