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Mitsubishi Electric SRK19CIS, Technical Manual, Page: 35 / 65

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Mitsubishi Electric SRK19CIS Technical Manual Download Page 35

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 34 

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(4)

Troubleshooting procedure (If the air conditioner runs)

NO

YES

Note (1) Even in cases where only intermittent stop data are generated, the air conditioning system is normal. However, if the same protective operation recurs

repeatedly (3 or more times), it will lead to customer complaints. Judge the conditions in comparison with the contents of the complaints.

Confirm the contents of the customer complaint.

Check the self-diagnosis display.

Eliminate the cause of the trouble and perform an
operation check.

Replace the faulty component, then perform an
operation check.

Identify the faulty component by using the check
procedure corresponding to the content of the trouble.

The cause of the trouble can
be specifically identified.

See page 35.

Summary of Contents for SRK19CIS

Page 1: ...ROOM AIR CONDITIONING TECHNICAL MANUAL PARTS LIST WALL MOUNTED TYPE ROOM AIR CONDITIONER Split system air cooled cooling only type SRK19CIS 25CIS ...

Page 2: ... 1 TECHNICAL MANUAL ...

Page 3: ...n 15 4 7 Outline of cooling operation 16 4 8 Outline of dry operation 17 4 9 Outline of auto operation 18 4 10 Outline of fan operation 18 4 11 Regulation of outdoor air flow 19 4 12 Stop mode 19 4 13 External control remote display control of input signal 20 4 14 Operation permission prohibition control 21 4 15 Protective control function 21 4 16 List of indoor unit jumper selections 24 5 APPLICA...

Page 4: ...t memorizes the position and continues to operate at the same position from the next time 2 Auto operation When the remote control is set on auto it will either automatically decide operation mode such as cooling and 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 install...

Page 5: ... Green TIMER Yellow HI POWER Green ECONO Orange Safety equipment O D mm in Liquid line ø6 35 1 4 Gas line ø15 88 5 8 Connecting method Flare connecting Attached length of piping Liquid line 0 70m Gas line 0 63m Insulation Necessary Both sides Drain hose Connectable P Recommended breaker size A 20 ower source supply Terminal block Screw fixing type Size Core number 1 5 mm2 4 cores Including earth c...

Page 6: ...ter thermostat Pilot lamp RUN Green TIMER Yellow HI POWER Green ECONO Orange Safety equipment O D mm in Liquid line ø6 35 1 4 Gas line ø15 88 5 8 Connecting method Flare connecting Attached length of piping Liquid line 0 70m Gas line 0 63m Insulation Necessary Both sides Drain hose Connectable Power source supply Terminal block Screw fixing type Size Core number 1 5 mm2 4 cores Including earth cab...

Page 7: ...erval Max 3 minutes Outdoor air temperature Upper lower limits Vertical height difference between outdoor unit and indoor unit Item Models 1 Indoor unit Models SRK19CIS 25CIS VIEW A A 17 3 60 150 4 43 5 55 64 48 9 Piping hole right left 3 248 55 4 19 51 2 55 Terminal block 1090 Unit mm 318 77 44 5 7 7 299 106 8 5 301 8 25 50 Installation board 450 50 25 Piping for Gas ø15 88 633 5 44 5 53 5 106 49...

Page 8: ...as ø15 88 5 8 Ground terminal 124 34 6 20 2 0 42 7 100 3 15 640 14 2 Outdoor unit Model SRC19CIS Model SRC25CIS Unit mm Terminal block Service valve Gas Flare fitting ø15 88 5 8 Service valve Liquid Flare fitting ø6 35 1 4 25 1 165 5 3 0 3 0 48 5 103 3 750 24 1 Drain holes 2 ø15 25 8 29 8 87 9 880 150 580 150 61 532 223 60 15 340 61 47 5 19 380 19 418 Unit mm ...

Page 9: ...hanger sensor Compressor Capillary tube Strainer accumulator Sub Accumulator Service valve Gas Electronic expansion valve Outdoor unit Indoor unit Room temp sensor Humidity sensor Heat exchanger Flare connecting Heat exchanger sensor Piping Liquid ø6 35 Piping Gas Check joint Service valve Liquid Flare connecting Discharge pipe temp sensor Muffler Outdoor air temp sensor Heat exchanger Heat exchan...

Page 10: ... length between the indoor and outdoor units 14 16 18 20 22 15 20 25 30 35 40 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 43 24 ISO T1 Standard Condition Indoor air W B temperature C W B Cooling Applicable range Coefficient of cooling capacity in relation to temperature Cooling operation Outdoor air D B temperature C D B Piping length m Cooling 7 1 0 10 0 99 15 0 975 20 0 965 25 0 95 How to obtain the cooling...

Page 11: ...tion DC12 Heating indication DC12 ON indication for CM DC12 Check indication DC12 Distant operation Heat exch sensor Outdoor unit Outdoor air temp sensor Discharge pipe temp sensor Varistor Electronic expansion valve Diode stack Auxiliary relay Capacitor for CM Capacitor for FMO Th4 Th5 Th6 ZNR EEV DS 52X1 4 CC CFO TB XR1 XR2 XR3 XR4 XR5 Parts name BL OR Y G Black Blue Orange Yellow Green WH White...

Page 12: ...C12 Heating indication DC12 ON indication for CM DC12 Check indication DC12 Distant operation Humidity sensor Heat exch sensor Outdoor unit Outdoor air temp sensor Discharge pipe temp sensor Varistor Electronic expansion valve Diode stack Auxiliary relay Th3 Th4 Th5 Th6 ZNR EEV DS 52X1 5 CC CFO TB XR1 XR2 XR3 XR4 XR5 Parts name BL OR Y G Black Blue Orange Yellow Green WH White RD Red GR Green Y Ye...

Page 13: ...ME SET UP switch Switch for resetting microcomputer This switch for setting the time SLEEP indicator Indication section Operation section Models All models Remote control Indicates during SLEEP operation TEMPERATURE indicator Indicates set temperature Does not indicate temperature when operation mode is on AUTO Indicates set air flow rate with lamp Indicates during CLEAN operation ON OFF TIMER ind...

Page 14: ...ng About 24ºC Dry About 24ºC Auto Auto Continuous 4 3 Power blackout auto restart function 1 Power blackout auto restart function is a function that records the operational status of the air conditioner immediately prior to it being switched off by a power cut and then automatically resumes operations at that point after the power has been restored 2 The following settings will be cancelled a TIME...

Page 15: ...ctions continuously 2 Swing louver Louver moves in left and right directions continuously 3 When not operating The flap returns to the position of air flow directly below when operation has stopped 4 Multi directional Air Flow up down air scroll and left right air scroll Activating both up down air swing and left right air swing at the same time results in a multi directional air flow Up down air ...

Page 16: ... above is performed during the dry in the auto mode 3 During the comfortable TIMER operation both the RUN light and TIMER light illuminate and the TIMER light goes off after expiration of the TIMER ON setting time If the difference Room temperature Setting tempera ture 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 de...

Page 17: ...ed 6 Speed 6 AUTO HIGH MED Speed 4 Speed 4 Speed 4 LOW Flow control Fan speed switching Speed 6 Speed 4 Thermostat setting point Speed 8 1 2 3 4 3 Thermostat operation The compressor and outdoor fan and turned on and off as shown below according to the temperature setting 4 HIGH POWER operation HI POWER button on the remote control ON The following operation is performed for 15 minutes without rel...

Page 18: ...r fan Start Temperature check Speed 4 4 8 0 Speed 1 20 seconds minutes B block Compressor and outdoor fan ON OFF OFF Indoor fan Start Temperature check Speed 4 8 0 minutes A block Compressor and outdoor fan ON OFF OFF Indoor fan Start Temperature check 4 8 0 Speed 1 20 seconds minutes 20 seconds D block Compressor and outdoor fan ON OFF OFF Indoor fan Start Temperature check Speed 4 Speed 1 8 3 0 ...

Page 19: ... shown below between the signals of the wireless remote control and the setting temperature Signals of wireless remote control Display 6 5 4 3 2 1 0 1 2 3 4 5 6 Setting Cooling 18 19 20 21 22 23 24 25 26 27 28 29 30 temperature Dry 18 19 20 21 22 23 24 25 26 27 28 29 30 4 10 Outline of fan operation 1 Operation of major functional components 2 HIGH POWER operation HI POWER button on the remote con...

Page 20: ...nit fun Flap EEV Cooling cooling oriented dry Cooling cooling oriented dry Operation Stop instructions All stop Stop instructions Restart When the complete stop command given when there is and abnormal stoppage command When stoppage occurs due to thermostat operation switching operations and protective function operations 470 pulse 150 pulse 1 min 1 min 3 min 2 min 55 sec 2 min 55 sec 470 pulse 4 ...

Page 21: ...ard of indoor unit Operation output Power to engage DC 12V relay provided by the customer is outputted during operation Heating output Power to engage DC 12V relay provided by the customer is outputted during the heating operation Compressor OPERATION output Power to engage DC 12V relay provided by the customer is outputted while the com pressor is operating MALFUNCTION output When any error occur...

Page 22: ... set to ON the operation starts and if the input is set to OFF the operation stops For the CnT and remote control inputs the input which is activated later has priority and can start and stop the operation When the jumper wire J3 is released Permission Prohibition mode When CnT input is set to ON the operation mode is changed to permission and if input is set to OFF the operation is prohibited Whe...

Page 23: ...on is effective However stopping the compressor via a stop signal or protection control has priority 5 Abnormality of outdoor unit When the indoor heat exchanger temperature does not fall to 25 C or below for 40 minutes after 5 minutes have elapsed since the compressor operation start the abnormality stop occurs The TIMER light flashes 2 times 6 Compressor overheat protection If the discharge pipe...

Page 24: ...y the indoor heat exchanger temperature sensor is 20ºC or lower continuously for 15 seconds or longer while operation is stopped an error indication is displayed RUN light 1 time flash TIMER light ON c Outdoor heat exchanger temperature sensor If the temperature detected by the outdoor heat exchanger temperature sensor is 64ºC or lower continuously for 15 seconds or longer while operation is stopp...

Page 25: ... PERMISSION CUSTOM BLANK BLANK AUTO RESTART LO TEMP DIRT PREVENT COOL ONLY HI CEIL PANEL 50 60 External input switching No function Operation permission prohibition Custom cord switching No function Auto restart No function LEVEL INPUT Normal operation Normal Enabled PULSE INPUT Enabled Select Disabled Page 20 Page 21 Page 14 Page 13 EXTERNAL INPUT WIRED REMOCON OPE PERMISSION CUSTOM AUTO RESTART ...

Page 26: ...g the safety standards related to electrical equipment and local regulations as well as the installation instructions and that only exclu 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 conduc...

Page 27: ...harged hot air or unit s operating sound will not be a nuisance to the neighborhood c d A place where servicing space can be secured A place where vibration will not be enlarged e Avoid installing in the following places A place near the bedroom and the like so that the operation noise will cause no trouble A place where there is possibility of flammable gas leakage A place exposed to strong wind ...

Page 28: ...gth Adjust so that board will be level by turning the board with the standard hole as the center Standard hole c Install the sleeve Inserting sleeve Sleeve Inclined Sealing plate Note 1 Drill a hole 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 beneat...

Page 29: ...RNR4G1 5 Example H Harmonized cable type 05 300 500 volts R Natural and or synth rubber wire insulation N Polychloroprene rubber conductors insulation R Standed core 4 Number of conductors G One conductor of the cable is the earth conductor yellow green 1 5 Section of copper wire mm2 Wiring Clamp Lid Terminal block When the hose is extended to left and taken out from the rear center Piping Drain h...

Page 30: ...en it is exposed indoor Drain hose c Fixing of indoor unit How to remove the indoor unit from the installation board Push up at the marked portion of the indoor unit base lower latch and slightly pull it toward you both right and left hand sides The indoor unit base lower latch can be removed from the installation board Push up the indoor unit upward So the indoor unit will be removed from the ins...

Page 31: ...e the flared nuts on both liquid and gas sides Install the removed flared nuts to the pipes to be connected then flare the pipes Dimension A Liquid side 6 35 9 0 mm Gas side 15 88 19 4 mm Press Remove Remove Do not turn 2 Connection of refrigerant piping Indoor unit side Connect firmly gas and liquid side pipings by Torque wrench Outdoor unit side Connect firmly gas and liquid side pipings by Torq...

Page 32: ...pe vacuum pump adapter so as to prevent vacuum pump oil from running back into the system Oil running back into an air conditioning system may cause the refrigerant cycle to break down Additional refrigerant charge When refrigerant piping exceeds 7m conduct additional refrigerant charge by weight after refrigerant piping completion Additional charge amount per meter 10g m Example How much amount o...

Page 33: ...ation etc or dust is deposited on it or it is used behind a curtain etc or less 5 m o r l e s s Wireless remote control 5 m or less or less 5 6 Precautions for wireless remote control installation and operation 1 Wireless remote control covers the following distances a When operating facing the air conditioner or less Model Item SRK19CIS SRK25CIS Low pressure MPa Cooling 0 42 0 62 0 39 0 59 Temp d...

Page 34: ...alve open 3 Troubleshooting procedure If the air conditioner does not run at all If the air conditioner does not run at all diagnose the trouble using the following troubleshooting procedure If the air conditioner is running but breaks down proceed to troubleshooting step 4 Important When all the following conditions are met we say that the air conditioner will not run at all The RUN light does no...

Page 35: ...ustomer complaints Judge the conditions in comparison with the contents of the complaints Confirm the contents of the customer complaint Check the self diagnosis display Eliminate the cause of the trouble and perform an operation check Replace the faulty component then perform an operation check Identify the faulty component by using the check procedure corresponding to the content of the trouble ...

Page 36: ... indoor unit s fan motor on exist during air conditioner operation an indoor unit fan motor speed of 300 rpm or lower is measured for 30 seconds or longer The air conditioner stops When the value of the discharge pipe sensor exceeds the set value The air conditioner stops Defective fan motor poor connector connection Gas shortage defective discharge pipe sensor closed service valve Indoor fan moto...

Page 37: ...17 120 1 9 55 14 125 1 6 60 12 130 1 4 65 10 135 1 3 Discharge pipe sensor temperature characteristics Indoor fan motor error Defective fan motor connector poor connection defective PCB Is connector connection good YES NO NO Is the output of the indoor unit s printed circuit board normal Normal NO YES YES Correct connector connection Is DC fan motor resistance value good Replace indoor PCB Replace...

Page 38: ...ransmission Wiring error including power cable defective indoor outdoor unit PCB Does error persist after power reset Are the lines connecting the indoor and outdoor units connected normally Is DC 0 Approx 12V detected between 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 in...

Page 39: ...pressor stop Heat exchanger sensor Outdoor air temperature sensor Discharge pipe sensor Compressor overload protection is disabled Can be operated 7 Phenomenon observed after shortcircuit wire breakage on sensor a Indoor unit Phenomenon Sensor Shortcircuit Broken wire Cooling Release of continuous compressor operation command Compressor stop Cooling Abnormality of outdoor unit Operation mode Room ...

Page 40: ...r or the circuit board is broken down 1 2 Indoor unit printed circuit board output check a Turn off the power b Remove the front panel then disconnect the fan motor lead wire connector c Turn on the power If the unit operates when the ON OFF button is pressed if trouble is detected after the voltages in the following figure are output for approximately 30 seconds it means that the circuit board is...

Page 41: ...ne 1 display it is basically normal 1 Is remote control normal YES Again pushing operating switch Operating the unit NO Does unit ON OFF button operates Operating the unit NO NO YES YES Remote control defects Abnormality is not found Replace the display Control problem on main unit Is the unit operable with remote control Defective remote control NO YES Normal ...

Page 42: ...hen immediately retighten it after observing that gas is blow out from the loosened portion e Open the valve and 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 refrigerant...

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Page 65: ...ROOM AIR CONDITIONING TECHNICAL MANUAL PARTS LIST Manual No 09 SRK T 086 ...

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