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Refrigerant cycle diagram
3.1Heat pump mode
Page 1: ...SERVICE MANUAL MIDEA AIRCONDITIONER FLOOR STANDING TYPE Model MFS2i 24ARN1 MFS2i 48ARN1...
Page 2: ...iagram 6 4 1 MFS2i 24ARN1 6 4 2 MFS2i 48ARN1 7 5 Installation details 8 5 1 Installation place 8 5 2 Installing 9 5 3 Refrigerant pipe connection 12 5 4 Drain Pipe of The Indoor Unit 23 5 5 Wiring 24...
Page 3: ...Functions 30 9 Characteristic of temperature sensor 31 10 Trouble shooting 31 10 1 Protective Function 31 10 2 Self diagnosis 33 10 3 LEDs for the indication of outdoor trouble 33 10 4 Troubles and So...
Page 4: ...se flammable gas or combustible near the product When flammable gas leaks turn off the gas and open a window for ventilation before turn the product on If strange sounds or small or smoke comes from p...
Page 5: ...the product outdoor units Always insert the filter securely Clean the filter every two weeks or more often if necessary Do not insert hands or other object through air inlet or outlet while the produ...
Page 6: ...3 2 Dimension 2 1 Indoor Unit Dimension Mode W mm D mm H mm MFS2i 24ARN1 500 273 1665 MFS2i 48ARN1 540 379 1775...
Page 7: ...4 2 2 Outdoor Unit Dimension Mode W mm D mm H mm W1 mm A mm B mm MFS2i 24ARN1 845 335 695 918 560 335 Dimension Mode W mm D mm H mm W1 mm A mm B mm MFS2i 48ARN1 990 355 965 1075 623 366...
Page 8: ...5 3 Refrigerant cycle diagram 3 1Heat pump mode...
Page 9: ...6 4 Wiring diagram 4 1 MFS2i 24ARN1 Indoor Unit Outdoor Unit...
Page 10: ...7 4 2 MFS2i 48ARN1 Indoor Unit Outdoor Unit...
Page 11: ...he outdoor unit the length of the refrigerant pipe and the curved places bend of the pipe are no more than the following numbers Elevation difference no more than 10M 24K or 15M 42K if the elevation d...
Page 12: ...conditions 5 1 2 2 If the outdoor unit is to be installed on a roof or where no constructions are around you should avoid hard wind blows directly to the air outlet because it may cause trouble for ai...
Page 13: ...nnecting the pipes wires Pull down the two knobs on the grid take off the two screws then the air inlet grid goes free 3 Take the Pipe Clip off before connecting the pipes and wiring fit it when these...
Page 14: ...inclination more than 45 degrees while shipping Avoid horizontal storage 4 Be sure the electric insulation work is well done if installed on metal ceiling wall 5 Fix the unit feet with bolts M10 M8 Be...
Page 15: ...rant should be added according to the following calculation Capacity Btu h Pipe size Standard length m Max Elevation B m Max Length A m Additional refrigerant g m Gas Liquid MFS2i 24 ARN1 5 8 16 0 3 8...
Page 16: ...wer on the system you should vacuum the indoor unit through the maintenance port on the cut off valves or open the high pressure valve and exhaust the air through the maintenance port on the low press...
Page 17: ...se a pipe bending device to make the compact bending pipe 5 3 2 2 Using bronze pipe selling in market Completely shut the cut off valves of the outdoor unit as ex work status After the refrigerant pip...
Page 18: ...akage checker after connecting 3 Be sure the connecting joint on the indoor side is insulated 4 Use two wrenches to connecting the pipes Outside diameter Torque Additional tightening torque mm inch N...
Page 19: ...parts in the refrigerant system Therefore the indoor units and the pipes between indoor and outdoor units must be leak tested and evacuated to remove gas and moisture from the system Air purging with...
Page 20: ...rclockwise for 6 or 7seconds after the gas coming out then tighten the flare nut again Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure 7 Remove...
Page 21: ...h pin to the gas service port 5 Air purging of the charge hose Open the low pressure valve on the charge set slightly to purge air from the charge hose 6 Set the 2 way valve to the close position 7 Op...
Page 22: ...ve on the charging cylinder closed 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds...
Page 23: ...ve stems 7 Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 5 3 6 Balance refrigera...
Page 24: ...t be necessary to apply an evacuation Discharge the refrigeration gradually if it is discharged too suddenly the refrigeration oil sill be discharged 5 3 7 Evacuation Procedure 1 Connect the vacuum pu...
Page 25: ...ge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the...
Page 26: ...rench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 5 4 Drain Pipe of The Indoor Unit 1 Make sure the drain pipe is connected to the outdoor side downward 2 The...
Page 27: ...e than 30 minutes 1 Open the panel and lift the panel up to angle which remains fixed Do not lift the panel any further when it stops with a click sound 2 Press the manual switch button twice until th...
Page 28: ...be different from the one you purchased Air Outlet Let the conditioned air go out from it Control Panel LCD Consists of indicators and control buttons Air Inlet Where a filter is settled absorbing the...
Page 29: ...de of the above conditions certain safety protection features may come into operation and cause the unit to function abnormally 2 Room relative humidity less than 80 If the air conditioner operates in...
Page 30: ...e remote switchover for fan speed among high low auto anti cold air function takes priority Auto fan in heating mode 8 2 2 5 Anti cold air Switchover between fan speed and fine tune can be set accordi...
Page 31: ...start to statistical time when reach the temperature condition Shut down or defrosting calculate time again 3 Accumulated time when temperature of outdoor heat exchanger coil T3 is below 3 C reaches t...
Page 32: ...mode then four way valve will be closed at the first time the compressor starts under the cooling mode 8 2 4 2 Conditions for the compressor and outdoor fan action Ts set temperature 8 2 4 3 Action o...
Page 33: ...ponding protective function will be executed 8 2 7 Fan Only Mode 8 2 7 1 Temperature setting function is disabled and no setting temperature is displayed 8 2 7 2 Under this mode four way valve compres...
Page 34: ...14 6181 44 4 3874 9 58 7079 18 13 918 45 4 2126 8 56 3694 19 13 2631 46 4 0459 7 52 2438 20 12 6431 47 3 8867 6 49 3161 21 12 0561 48 3 7348 5 46 5725 22 11 5 49 3 5896 4 44 23 10 9731 50 3 451 3 41 5...
Page 35: ...or protection only for 48K When outdoor protection signal is high level last 4 seconds outdoor unit will perform protection the whole machine will be shut down while the indoor unit will indicate the...
Page 36: ...Open circuit and short circuit of indoor temperature sensors T1 E2 Temp sensor T2 on indoor evaporator is open circuit or short circuit E3 The condenser temperature sensor T3 is open or short E6 Prote...
Page 37: ...ait or cancel timer setting The batteries of the remote control are exhausted Change the batteries Air conditioner does not cool or heat well The temperature setting is too high or too low Set a more...
Page 38: ...e temperature of the evaporator of indoor unit is too low or high For the protection feature the compressor turns off automatically 3 P5 The temperature of condenser of the outdoor unit is too high Fo...
Page 39: ...o low or high For the protection feature the compressor turns off automatically The temperature of the evaporator of indoor unit is too low or high For the protection feature the compressor turns off...
