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compressor, indoor fan run 5 minutes in low speed. And repeat on and off cycle. 

8.8.3  Low room temperature protection: 

When room temperature decreases to below 10

, the compressor and the outdoor fan 

will stop(indoor fan is Breeze). Dehumidifying operation will be resumed when room 
temperature restores to over 13

8.8.4 Under dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the 

same as that of cooling mode. 

8.9    Heating mode 
8.9.1  Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode. 

4-way 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. 

8.9.2  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. 

8.9.3  Action conditions of compressor under heating mode: compressor must run for 7 

minutes after starting and then judge temperature. Meanwhile other protections are still 
valid. 

 Condition 

Compressor 

Outdoor 

fan 

TA> Ts+3 

Off 

Off 

Room temp. up 

TA<Ts+3 On 

On 

TA< Ts+2 

On 

On 

Room temp. down 

TA>Ts+2 Off 

Off 

TA: Indoor ambient temperature 
TS: Setting temperature through the remote controller 

 

8.9.4  Indoor Fan actions under heating mode 

Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller, but 
Anti-cold wind function has the priority. 
Anti-cold wind control function under heating mode 

 Condition 

TE  

Indoor fan speed 

TE<TE1 Off 

TE1<TE<TE2 Breeze 

Indoor exchanger temp. up 

TE>TE2 

Setting fan speed 

TE> TE3 

Setting fan speed 

TE3<TE<TE4 Breeze 

Indoor exchanger temp. down 

TE<TE4 Off 

TE: Indoor evaporator temperature 
TE1: Anti-cold wind, from Fan Off to Breeze temperature 
TE2: Anti-cold wind, from Breeze to Setting Fan Speed temperature 
TE3: Anti-cold wind, from Setting Fan Speed to Breeze temperature 
TE4: Anti-cold wind, from Breeze to Fan Off temperature 

 
 
 
 

Summary of Contents for M2OA-18HRN1

Page 1: ...rigeration Equipment Co Ltd MULTI SPLIT TYPE HEAT PUMP AIR CONDITIONERS Technical service manual 2005 R410A Corona multi Series Indoor Models MSCI 09HRN1 MSCI 12HRN1 Outdoor Models M2OA 18HRN1 M2OA 21...

Page 2: ...SERIES 1 Features 2 Specification 3 Dimensions 4 Refrigeration cycle diagram 5 Operation limits 6 Wiring diagram 7 Troubleshooting 8 Electronic function 9 Exploded view parts 10 Characteristic of tem...

Page 3: ...216 1 Features 1 1Compact design 1 2High efficiency and quiet operation 1 3Unitary outdoor unit design...

Page 4: ...apacitor uF 1 2 1 2 Indoor fan motor Speed hi mi lo r min 1200 950 850 1220 1000 800 a Number of rows 2 2 b Tube pitch a x row pitch b mm 21x13 37 21x13 37 c Fin spacing mm 1 3 1 3 d Fin type code Unh...

Page 5: ...0x2 1 2 1 0x2 1 2 1 0x2 1 2 Max input consumption W 2160 2580 3400 3720 Max current A 9 9 11 7 15 6 16 7 Starting current A 21 7 29 9 31 8 31 8 Model PA108X1C 4FTx2 PA108X1C 4FT PA145X2C 4FT PA200X2CS...

Page 6: ...oor coil g Number of circuits 2 2 2 2 3 3 3 3 Outdoor air flow m3 h 2200 2200 3200 3200 Outdoor noise level dB A 56 56 58 58 Dimension W H D mm 895X655X345 895X655X345 860X830X330 860X830X330 Packing...

Page 7: ...ol Electronic control Operation temp 17 30 17 30 17 30 17 30 Ambient temp 18 45 cooling 7 30 heating 18 45 cooling 7 30 heating 18 45 cooling 7 30 heating 18 45 cooling 7 30 heating Application area m...

Page 8: ...214 3 Dimensions 3 1 Indoor unit a Indoor unit 9K b Indoor Unit 12K...

Page 9: ...215 3 2 Outdoor unit a Outdoor unit 18K 21K b Outdoor unit 27K 30K...

Page 10: ...1 drive 2 system PMV1 1 drive 2 system SV1 Primary four way valve SV2 Secondary four way valve PMV1 PMV2 Electronic expansive valve T1 T2 Indoor pipe temperature sensor condenser four way valve evapo...

Page 11: ...ontinuous operation under constant air temperature conditions However excludes the initial pull down stage 5 2Heating operation Indoor air temp DB 30 25 20 15 10 5 5 5 15 25 Outdoor unit air temp DB N...

Page 12: ...218 6 Wiring diagram Indoor unit CORONA INDOOR UNIT Outdoor unit FOR 1 DRIVE 2 OUTDOOR UNIT...

Page 13: ...219 FOR 1 DRIVE 3 OUTDOOR UNIT...

Page 14: ...p sensor is open circuit or short circuit on EEPROM error on Over current protection of the compressor occurs 4 times in 1h X r Extinguish Flash at 5Hz On Light 7 2 Outdoor unit Failure phenomenon LED...

Page 15: ...cator a Usually it displays the temperature settings When change the setting temperature this indicator begins to flash and stops 20 seconds later b It displays the room temperature when the air condi...

Page 16: ...unit pipe sensor T4 Outdoor temperature sensor 8 4 Systematic functions Remote receiving Testing and forced run Position set for indoor unit wind vane LED displaying and alarm On or off Timer Protect...

Page 17: ...ff TA Ts On On Temp down TA Ts Off Off TA Indoor ambient temperature TS Setting temperature through the remote controller Auto fan under cooling mode Condition T Indoor Temp Setting Temp Indoor fan sp...

Page 18: ...frost 8 9 3 Action conditions of compressor under heating mode compressor must run for 7 minutes after starting and then judge temperature Meanwhile other protections are still valid Condition Compres...

Page 19: ...porator high temperature protection compressor off temperature TE8 Evaporator high temperature protection fan off temperature TE9 Evaporator high temperature protection restoring temperature 8 10 Defr...

Page 20: ...on whose fan mode is set as low the A C operates under the DRY mode with a set temp of 24 8 12 3 All protections of remote control cooling are available under forced cooling operation 8 13 Forced Auto...

Page 21: ...227 8 16 Outdoor fan motor T4 Outdoor temp T4 Outdoor fan motor T4 27 High speed Cooling mode T4 25 Low speed T4 13 Low speed Heating mode T4 11 High speed...

Page 22: ...228 Exploded view parts a INDOOR UNIT...

Page 23: ...229 b UNIVERSAL OUTDOOR UNIT...

Page 24: ...230...

Page 25: ...1918 1 37 1988 26 9 5507 53 3 0707 0 35 2024 27 9 1245 54 2 959 1 33 3269 28 8 7198 55 2 8442 2 31 5635 29 8 3357 56 2 7382 3 29 9058 30 7 9708 57 2 6368 4 28 3459 31 7 6241 58 2 5397 5 26 8778 32 7...

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