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Mitsubishi Heavy Industries SRK20HC-S, Technical Manual, Page: 32 / 34

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Mitsubishi Heavy Industries SRK20HC-S Technical Manual Download Page 32

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 30 

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Serial signal transmission error

[Wiring error including power cable, defective indoor/
outdoor unit PCB]

Does error persist after power
reset?

Is there any wrong connection on
indoor/outdoor unit wiring?

Is DC 0~Approx. 12V detected
between 

2

~

3

 terminals on

indoor unit terminal block?

YES

YES

NO

NO

YES

NO

Trouble by transient cause, not unit trouble.

Correct improper wire connection on indoor/
outdoor unit.

Defective indoor unit PCB

YES

YES

NO

NO

Is DC 0~Approx. 12V detected
between

2

~

3

 terminals on

outdoor unit terminal block?

Is  AC 220/230/240V applied
between 

1

~

2

 on the outdoor side

terminal block?

Defective indoor unit PCB. Check crossover wires.

Defective outdoor unit PCB

Check crossover wires.

(4)

Phenomenon observed after shortcircuit, wire breakage on thermistor.

(a)

Indoor unit

Phenomenon

Thermistor

Shortcircuit

Broken wire

Cooling

Release of continuous compressor operation command

Heating

Continuous compressor operation command is not released.

Cooling

System can be operated normally.

Heating

High pressure control mode

(b)

Outdoor unit

Phenomenon

Thermistor

Shortcircuit

Broken wire

Cooling

System can be operated normally.

Heating

Defrosting is not performed.

Cooling

System can be operated normally.

Heating

Defrosting is not operated.

All modes

Operation
mode

Room temperature
thermistor

Continuous compressor operation command is not released.

Release of continuous compressor operation command

Continuous compressor operation command is not released.
(Anti-frosting)

Hot keep (Indoor fan stop)

Heat exchanger
thermistor

Operation
mode

System can be operated normally.

Defrosting is performed for 10 minutes at approx. 1 hour.

Defrosting is performed for 10 minutes at intervals of approx. 1 hour.

Compressor stop

Heat exchanger
thermistor

Outdoor temperature
thermistor

Discharge pipe
thermistor

Compressor overload protection is disabled.
(Can be operated.)

Summary of Contents for SRK20HC-S

Page 1: ... 3 WALL MOUNTED TYPE ROOM AIR CONDITIONER Split system air to air heat pump type SRK20HC S SRK28HC S SRK40HC S TECHNICAL MANUAL Collection data Manual No 03 SRK T 031 ...

Page 2: ...Back up switch 11 4 3 Power cut compensation 11 4 4 Flap control 12 4 5 Comfort timer setting 12 4 6 Outline of heating operation 13 4 7 Outline of cooling operation 16 4 8 Outline of dehumidifying operation 17 4 9 Automatic operation 18 4 10 Protective control function 18 5 APPLICATION DATA 20 5 1 Selection of location for installation 21 5 2 Installation of indoor unit 22 5 3 Installation of out...

Page 3: ...on auto it will either automatically decide operation mode such as cooling heating and thermal dry or operate in the operation mode before it has been turned to automatic control 3 Self diagnosis function We are constantly trying to do better service to our customers by installing such judges that show abnormality of operation as follows R410A models Series No Heat pump type Product capacity Wall ...

Page 4: ...ater Operation control Operation switch Wireless Remote controller Room temperature control MC Thermostat Pilot lamp RUN Green TIMER Yellow HI POWER Green ECONO Orange Safety equipment O D mm in Liquid line φ6 35 1 4 Gas line φ9 52 3 8 Connecting method Flare connecting Attached length of piping Liquid line 0 4 m Gas line 0 33 m Insulation Necessary Both sides Drain hose Connectable Power source c...

Page 5: ...essor Electric heater Operation control Operation switch Wireless Remote controller Room temperature control MC Thermostat Pilot lamp RUN Green TIMER Yellow HI POWER Green ECONO Orange Safety equipment O D mm in Liquid line φ6 35 1 4 Gas line φ9 52 3 8 Connecting method Flare connecting Attached length of piping Liquid line 0 4 m Gas line 0 33 m Insulation Necessary Both sides Drain hose Connectab...

Page 6: ...ompressor Electric heater Operation control Operation switch Wireless Remote controller Room temperature control MC Thermostat Pilot lamp RUN Green TIMER Yellow HI POWER Green ECONO Orange Safety equipment O D mm in Liquid line φ6 35 1 4 Gas line φ12 7 1 2 Connecting method Flare connecting Attached length of piping Liquid line 0 4 m Gas line 0 33 m Insulation Necessary Both sides Drain hose Conne...

Page 7: ...FF interval Max 3 minutes Outdoor air temperature Upper lower limits Vertical height difference between outdoor unit and indoor unit Max 5m Outdoor unit is higher Max 5m Outdoor unit is lower Item Models Unit mm A VIEW A 815 117 5 580 117 5 247 4 5 4 5 4 5 3 5 60 788 60 14 5 60 9 148 5 216 5 216 5 216 5 8 2 44 5 236 1 5 7 450 450 67 5 42 7 47 2 175 44 5 216 5 216 5 216 5 148 5 53 5 250 Piping for ...

Page 8: ... Liquide ø6 35 1 4 Service valve Gas ø12 7 1 2 Ground terminal 124 34 6 2 0 2 0 42 7 100 3 15 640 14 Model SRC40HC S Unit mm 290 540 14 4 47 4 42 6 264 5 71 404 5 510 720 17 8 Drain holes 50 12 39 7 99 9 340 312 5 13 5 14 139 2 16x12 61 9 139 3 33 3 Flare connecting ø6 35 1 4 Service valve Liquid 4 0 4 0 Flare connecting ø9 52 3 8 Service valve Gas Terminal block ...

Page 9: ...mistor Piping Liquid ø6 35 Check joint 4 way valve Service valve Liquid Flare connecting Discharge temp thermistor Cooling cycle Heating cycle Outdoor air temp thermistor Heat exchanger Heat exchanger thermistor Compressor Capillary tube Strainer Accumulator Service valve Gas Capillary tube Electronic expansion valve Piping Gas 20 28 ø9 52 40 ø12 7 ...

Page 10: ...ing on the outdoor heat exchanger How to obtain the cooling and heating capacity Example The net cooling capacity of the model SRK40HC S with the piping length of 15m indoor wet bulb temperature at 19 0 C and outdoor dry bulb temperature 35 C is Net cooling capacity 3600 0 975 1 0 3510 w SRK40HC S Length 15m Factor by air temperatures 15 ISO T1 Standard Condition Outdoor air W B temperature C W B ...

Page 11: ... BR BL CNB CNE CNG Th1 Th2 CNG Th4 Th5 Th6 CNE CNB CNU Display Wireless R Amp 1 2 3 Black Brown Red Light blue White Yellow Green BK BR RD LB WH Y GN Color symbol Meaning of marks Symbol Parts name CFI Capacitor for FMI CM Compressor motor F Fuse FMI Fan motor Indoor FMo Fan motor Outdoor FM Flap motor Symbol Parts name Th1 Room temp thermistor Th2 Heat exchanger thermistor Indoor unit Th4 Heat ex...

Page 12: ...the clock OFF TIMER button This button selects OFF TIMER operation TEMPERATURE button This button sets the room temperature This button changes the present time and TIMER time CANCEL button This button cancels the ON timer and OFF timer RESERVE button This button sets the present time and TIMER time S Indication section OPERATION MODE Indicator Indicates selected operation with lamp Auto Cool Heat...

Page 13: ...e following settings will be cancelled a Timer settings b High power operations Notes 1 The power cut compensation function is set at on when the air conditioner is shipped from the factory Consult with your dealer if this function needs to be switched off 2 If the power cut compensation function is set at on ensure that the power switch is turned off after operations have been halted If the power...

Page 14: ...re is 4ºC the correction value is found to be 5 min utes from the table shown above so that the starting time of next operation is determined as follows 15 min earlier 5 min 20 min earlier Current operation Correction value start time 4 5 Comfort timer setting If the timer is set at ON when the operation select switch is set at the cooling or heating or the cooling or heating in auto mode operatio...

Page 15: ...oor fan motor Flaps Display 52C Outdoor fan motor ON ON or OFF Lights up ON OFF ON ON or OFF Lights up ON ON OFF Stop position control Lights up or flashes OFF after stop mode OFF 4 way valve Depending on the stop mode ON Depending on the stop mode When the compressor command is OFF When the compressor command is ON When the compressor goes OFF due to an abnormal stop Functional components Item Ai...

Page 16: ... exchanger thermistor temperature is 5ºC or lower continuously for 3 minutes 4 The difference between the outdoor temperature thermistor temperature and the outdoor heat exchange thermistor tem perature is 4 5ºC 5 The compressor is running Also the number of times the compressor goes OFF is counted and when it reaches 10 or more times if the conditions in 1 2 and 3 above except that the outdoor he...

Page 17: ... at speed 3 OFF Compressor command Indoor unit fan Operating lamp Flashes Outdoor unit fan 4 way valve Defrost start operation Hot keep Defrost operation Operation after defrost is ended Normal heating operation defrost recovery Controlled by the indoor heat exchanger temperature The chart at left is for reference Hot keep control governs operation during heating Hot keep Recovery temperature 9ºC ...

Page 18: ...during the HI POWER operation 2 Protective functions will actuate with priority even during the HI POWER operation Indoor fan motor Flaps Display 52C Outdoor fan motor ON ON or OFF Lights up ON OFF ON ON or OFF Lights up ON ON OFF Stop position control Lights up or flashes OFF after stop mode OFF 4 way valve Depending on the stop mode OFF Depending on the stop mode When the compressor command is O...

Page 19: ...temp deg 2 Start up operation ON OFF OFF 0 3 6 9 12 ON OFF OFF 0 12 Compressor and outdoor fan Set fan speed Indoor fan Start Temperature check Start Temperature check Compressor and outdoor fan Set fan speed Indoor fan Operation block decision C D Block A B Block minutes minutes Speed 1 Speed 1 20 seconds ON OFF OFF 0 4 8 ON OFF OFF 0 8 Compressor and outdoor fan Indoor fan D Block Compressor and...

Page 20: ... exchanger During cooling or dehumidifying a Operating conditions i Indoor heat exchanger temperature detected with Th2 is lower than 2 5ºC ii 3 minutes elapsed after the start of operation b Detail of anti frost operation Compressor OFF Indoor fan 1st speed Outdoor fan OFF 4 way valve Stop mode c Reset conditions Indoor heat exchanger temperature Th2 is higher than 8ºC 2 Indoor fan motor protecti...

Page 21: ... Room temperature thermistor If the temperature detected by the room temperature thermistor is 20ºC or lower continuously for 15 seconds or longer while operation is stopped an error indication is displayed b Indoor heat exchanger thermistor If the temperature detected by the indoor heat exchanger thermistor is 20ºC or lower continuously for 15 seconds or longer while operation is stopped an error...

Page 22: ...sive use circuits are used Insufficient power source circuit capacity and defective installment execution can be the cause of electric shocks and fires Accurately connect wiring using the proper cable and insure that the external force of the cable is not conducted to the terminal connection part through properly securing it improper connection or securing can result in heat generation or fire Tak...

Page 23: ... lower 5 m Outdoor unit is higher 5 m r h Snow hood Height Must be over the possible snow deposit height Left side Right side 5 cm 10 cm 1 5 cm 6 5 cm Air inlet Air inlet Air Outlet 100 100 600 No obstacles Service space for electrical parts Unit mm Notes 1 Blowing out port and suction port on the back side of the unit can be installed at a distance of 10cm from walls In case the barrier is 1 2m o...

Page 24: ...ll with incline of 5 degree from indoor side to outdoor side Indoor side Outdoor side Cut off the sleeve collar in case of drawing piping out to rear Cut off the sleeve collar that can be seen from beneath the unit Wall thickness 1 5 cm Indoor side Outdoor side Turn to tighten Paste View of sleeve when installed Inclined flange Sealing plate Sleeve Indoor side Outdoor side Look for the inside wall...

Page 25: ... inserted in sufficiently water leakage could re sult Since this air conditioner has been designed to collect dew drops on the rear surface to the drain pan do not attach the power cord above the gutter Gutter Wall Pipe accommodation section 1 Connect the connection wire securely to the terminal block If the wire is not affixed completely contact will be poor and it is dangerous as the terminal bl...

Page 26: ...strong winds secure the unit firmly with foundation bolts wire etc 2 Connection of indoor and outdoor connecting wiring a Connect the wiring according to the number of the indoor terminal block Mis wiring may cause the burning damage and make sure to connect correctly Notes 1 To prevent the mis operation by noise when the connecting wire too long for indoor and outdoor Please hide the fixed wire i...

Page 27: ...e Liquid side ø6 35 14 0 18 0N m 1 4 1 8kgf m Gas side ø9 52 33 0 42 0N m 3 3 4 2kgf m ø12 7 50 0 62 0N m 5 0 6 2kgf m Use one more spanner to fix the valve Spanner for fixing the piping Torque wrench Specified torquing value Liquid side ø6 35 14 0 18 0N m 1 4 1 8kgf m Gas side ø9 52 33 0 42 0N m 3 3 4 2kgf m ø12 7 50 0 62 0N m 5 0 6 2kgf m Since the system uses service ports differing in diameter...

Page 28: ... 22 Cooling 3 1 3 0 2 9 3 9 3 7 3 5 5 3 5 1 4 9 Running current A Heating 3 0 2 9 2 8 3 7 3 5 3 3 5 5 5 3 5 1 Note 1 The data are measured at following conditions Ambient air temperature Indoor side Cooling 27 C DB 19 C WB Heating 20 C DB Outdoor side Cooling 35 C DB 24 C WB Heating 7 C DB 6 C WB Low pressure MPa kgf cm2 Temp difference between return air and supply air C High pressure MPa kgf cm2...

Page 29: ...gain Temporarily turn off the power source and turn it on again in about 1 min and turn the unit on again YES No YES YES Does the trouble occur again Disconnect connectors and connect them again Operate the unit again after confirming that the fuse and the varistor equipped on PCB does not burn out Carry out checks according to detailed check process See later page Unit did not cool etc Is the pow...

Page 30: ...signal transmission error Compressor faulty Overload operation 51C operation Gas shortage Defective discharge pipe thermistor Compressor lock Closed service valve Broken signal wire Defective indoor outdoor unit PCB 3 Inspection procedures corresponding to detail of trouble Thermistor error Broken thermistor wire connector poor connection Shortcircuit Broken wire Is connector connection good YES Y...

Page 31: ... check replacement of Discharge pipe thermistor Does trouble persist after charging gas Clogged capillary tube etc Indoor fan motor error Defective fan motor defective PCB YES YES NO NO Is connector connection good Is voltage applied to fan motor Defective fan motor Correct connector connection Defective indoor unit PCB Outdoor unit abnormal Compressor faulty compressor wiring disconnected Overloa...

Page 32: ...re Cooling Release of continuous compressor operation command Heating Continuous compressor operation command is not released Cooling System can be operated normally Heating High pressure control mode b Outdoor unit Phenomenon Thermistor Shortcircuit Broken wire Cooling System can be operated normally Heating Defrosting is not performed Cooling System can be operated normally Heating Defrosting is...

Page 33: ... block Power supply Between 1 2 AC 220 230 240V Signal Between 2 3 Changing between DC 0 Approx 12V 6 How to make sure of remote controller 1 Is remote controller normal YES Again pushing operating switch Operating the unit NO Does backup switch operates Operating the unit NO NO YES YES Remote controller defects Abnormality is not found Replace the display Control problem on indoor unit Is the uni...

Page 34: ...s and then immediately retighten it after observing that gas is blow out from the loosened portion e Open the valve 1 and 3 after discharging air from the charge hose A then the gas refrigerant begins flowing from the cylinder into the unit Be sure to erect the refrigerant cylinder upright to let gas refrigerant flow into the unit f When refrigerant has been charged into the system to some extent ...

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