Mitsubishi Heavy Industries SRK20HG, Technical Manual

Page 1: ... 3 WALL MOUNTED TYPE ROOM AIR CONDITIONER TECHNICAL MANUAL Collection data Manual No 07 SRK T 064 Split system air to air heat pump type SRK20HG SRK28HG SRK40HG ...

Page 2: ...unction 12 4 4 Custom cord switching procedure 13 4 5 Flap control 13 4 6 Timer operation 14 4 7 Outline of heating operation 15 4 8 Outline of cooling operation 18 4 9 Outline of dehumidifying operation 19 4 10 Outline of automatic operation 20 4 11 Outline of clean operation 20 4 12 Protective control function 21 5 APPLICATION DATA 23 5 1 Selection of location for installation 24 5 2 Installatio...

Page 3: ... 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 Series No Heat pump type Product capacity Wall mounted type Split type room air co...

Page 4: ...ntrol Microcomputer 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 cord 2 m 3 cores with Earth Size Core number 1 5 mm2 4 cores Including earth...

Page 5: ...trol Operation switch Wireless Remote control Room temperature control Microcomputer 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 cord 2 m 3 ...

Page 6: ...trol Operation switch Wireless Remote control Room temperature control Microcomputer 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 Connectable Power source cord 2 m 3 ...

Page 7: ...or unit is lower Item Models Max 10 times h Inching prevention 3 minutes Cooling operation Approximately 21 to 32 C Heating operation Approximately 15 to 30 C Cooling operation Approximately 21 to 43 C Heating operation Approximately 5 to 21 C 2 3 Exterior dimensions 1 Indoor unit Models All models Piping hole ø65 Piping hole ø65 53 5 380 6 Pipng for Liquid 448 6 ø6 35 20 28 ø9 52 40 ø12 7 Pipng f...

Page 8: ...ø20 138 4 4 0 61 9 18 9 165 1 510 104 9 439 1 111 4 99 4 349 5 313 1 43 1 290 12 50 350 23 5 312 5 14 33 5 4 0 42 5 95 9 14 540 780 Service valve Liquid Flare connection ø6 35 1 4 Service valve Gas Flare connection 20 28 ø9 52 3 8 40 ø12 7 1 2 Terminal block ...

Page 9: ...ischarge temp sensor Muffler Heat exchanger sensor Heat exchanger Outdoor air temp sensor Cooling cycle Heating cycle Models SRK20HG 28HG Outdoor unit Indoor unit Flare connecting Room temp sensor Heat exchanger Flare connecting Piping Liquid ø6 35 Heat exchanger sensor Piping Gas ø12 7 Service valve Gas Check joint 4 way valve Service valve Liquid Strainer Capillary tube Compressor Accumulator Di...

Page 10: ...espect to the frosting on the outdoor heat exchanger How to obtain the cooling and heating capacity Example The net cooling capacity of the model SRK20HG 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 2070 0 975 1 0 2018 W SRK20HG Length 15m Factor by air temperatures 15 ISO T1 Standard Condition Outdoor air W B tem...

Page 11: ...ard Printed circuit board BK BL BR Y WH LB Y G RD Color symbol Black Blue Brown Yellow White Light blue Yellow Green Red Meaning of marks Symbol Parts name Symbol Parts name Symbol Parts name CM F FMI FMO SM Th1 Compressor motor Fuse Fan motor Indoor Fan motor Outdoor CFI CFO Capacitor for FMI Capacitor for FMO Motor Protector for CM Magnetic contactor Auxiliary relay Flap motor Room temp sensor T...

Page 12: ...ight blue Yellow Green Red Meaning of marks Symbol Parts name Symbol Parts name Symbol Parts name CM F FMI FMO SM Th1 Compressor motor Fuse Fan motor Indoor Fan motor Outdoor CFI CFO Capacitor for FMI Capacitor for FMO Flap motor Room temp sensor Th2 Heat exch sensor Indoor unit Th4 Th5 Th6 ZNR 20S DS 52X1 3 Auxiliary relay Heat exch sensor Outdoor unit TB Terminal block 52C Magnetic contactor Out...

Page 13: ...EAN mode ON TIMER button This button selects ON TIMER operation This button cancels the ON timer OFF timer and SLEEP operation CANCEL button RESET switch Switch for resetting microcomputer and setting time SLEEP indicator Indicates during SLEEP operation TEMPERATURE indicator Indicates set temperature Does not indicate temperature when operation mode is on AUTO FAN SPEED indicator Indicates set ai...

Page 14: ...g thermal dry or heating modes Function Room temperature Operation mode setting Fan speed Flap Timer switch Cooling About 24ºC Thermal dry About 24ºC Auto Auto Continuous Heating About 26ºC 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...

Page 15: ...t contact with the other the lead wires etc 2 Modifying the wireless remote control a Remove the battery b Cut the jumper wire shown in the figure at right Jumper wire J6 Cut 4 5 Flap control Control the flap by AIRFLOW button on the wireless remote control 1 Swing flap Flap moves in upward and downward directions continuously 2 When not operating The flap returns to the position of air flow direc...

Page 16: ...lier Current operation Correction value start time 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 operation is selected the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the relationship between the room temperature at the setting time tempe...

Page 17: ...oor unit fan are operating Indoor fan motor Flaps Display 52C Outdoor fan motor ON ON or OFF Lights up ON ON ON or OFF Lights up ON ON OFF Stop position control Lights up or flashes 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 anomalous stop Functional components Item...

Page 18: ...it heat exchanger sensor temperature is 5ºC or lower continuously for 3 minutes 4 The difference between the outdoor air temperature sensor temperature and the outdoor heat exchange sensor tempera ture 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 hea...

Page 19: ... 4 OFF Compressor command Indoor unit fan RUN light 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 OFF OFF OFF ON...

Page 20: ...r and the termostat setting as shown below 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 relation to the set temperature or fan speed setting 5 ECONOMY operation ECONO button on the remote contr...

Page 21: ...0 12 Compressor and outdoor fan Speed 2 Indoor fan Start Temperature check Start Temperature check Compressor and outdoor fan Indoor fan Operation block decision C D block A B block minutes minutes Speed 2 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 outdoor fan Indoor fan C block Compressor and outdoor fan Indoor fan B block Compr...

Page 22: ...rature setting correction value and then begins in the automatic operation Heating Dehumidifying Cooling Room temperature C Outdoor temperature C 2 The unit checks the temperature every 30 minutes after the start of operation and if the result of check is not same as the previous operation mode changes the operation mode 3 When the unit is started again within 30 minutes after the stop of automati...

Page 23: ...ee minute forced operation When the compressor begins operating the thermal operation is not effective for 3 minutes so operation continues as is in the operation mode After 3 minutes has passed the thermal operation is effective However stopping the compressor via a stop signal or protection control has priority When the indoor heat exchanger temperature is 58 C Indoor heat exchanger temp C Compr...

Page 24: ...ted by the indoor heat exchanger sensor is 20ºC or lower continuously for 3 minutes after heating operation has started the indoor unit s fan speed is forcibly raised to speed 5 After this the air conditioner is stopped if the detected temperature remains at 20ºC continuously for 40 minutes c Outdoor heat exchanger sensor If the temperature detected by the outdoor heat exchanger sensor is 50ºC or ...

Page 25: ...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 Take car...

Page 26: ... is possibility of flammable gas leakage A place exposed to strong wind In a salt laden atmosphere or a place where the generation of oil mist vapor or fume is expected f In heating operation snow deposit on the heat exchanger of outdoor unit must be prevented for keeping the normal performance capacity 1 Snow hood on outdoor unit as in drawing will reduce the frequency of defrost operation When i...

Page 27: ... 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 structures Intersediate support or pillar and firaly install the unit after level surface has been checked Mating mark for level surface 450 IN...

Page 28: ... type 05 300 500 volts R Natural and or synth rubber wire insulation N Polychloroprene rubber conductors insulation R Standed core 4or5 Number of conductors G One conductor of the cable is the earth conductor yellow green 1 5 Section of copper wire mm2 Matters of special notice when piping from left or center rear of the unit Piping Drain hose Tape only the portion that goes through the wall Alway...

Page 29: ... hose c Fixing of indoor unit How to remove the indoor unit from the installation board 1 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 2 Push up the indoor unit upward So the indoor unit will be removed from the installation board Remove it...

Page 30: ...ner to fix the valve Remove the flared nuts on both liquid and gas sides Remove 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 ø6 35 9 0 mm Gas side ø9 52 13 0 mm ø12 7 16 2 mm Press Remove Remove Do not turn Spanner for fixing the piping Torque wrench Specified torquing value Liquid side ø6 35 ...

Page 31: ...ing back into an air conditioning system may cause the refrigerant cycle to break down 4 Insulation of connecting portion a Cover the connecting portion of the refrigerant piping with the pipe cover and seal them If neglecting to do so moisture occurs on the piping and water will drip out b Finishing and fixing 1 Tie up the piping with wrapping tape and shape it so that it conforms to which the pi...

Page 32: ...ling 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 Temp difference between return air and supply air C High pressure MPa 220 230 240V b When manipulating the remote control mounted on a wall Make sure that it works normally i e transmission reception signal is audible before mounting Notes 1 The remote control is correctly facing the se...

Page 33: ...ain 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 powe...

Page 34: ...Error of signal transmission Compressor faulty Overload operation 51C operation Gas shortage Defective discharge pipe sensor Broken signal wire Defective indoor outdoor unit PCB 3 Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire connector poor connection Shortcircuit Broken wire Is connector connection good YES YES NO NO Replace PCB Correct connection Replac...

Page 35: ...rcuit Check if the heat exchanger is dirty stopped up etc Adjust the level to the proper level Connect it securely NO NO Is discharge pipe sensor resistance value good Is sufficient quantity of refrigerant circulated Defective outdoor unit PCB YES YES NO NO YES NO Gas shortage Connector connection check resistance value check replacement of discharge pipe sensor Does trouble persist after charging...

Page 36: ... 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 sensor 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 ...

Page 37: ...k the voltage on the terminal 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 control 1 Is remote control normal YES Again pushing operating switch Operating the unit NO Does operating Unit ON OFF button YES Replace the display Remote control defects Abnormal is not fount It is normal Remote control defects NO NO YES N...

Page 38: ... 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 r...

Page 39: ... 2 WALL MOUNTED TYPE ROOM AIR CONDITIONER No 073 1A RO Air Conditioning Refrigeration Systems Headquarters 16 5 2 chome Kounan Minato ku Tokyo 108 8215 Japan Fax 03 6716 5926 ...