Mitsubishi Heavy Industries SRC20HG-S, Technical Manual

Page 1: ... 3 WALL MOUNTED TYPE ROOM AIR CONDITIONER TECHNICAL MANUAL Collection data Manual No 07 SRK T 068 Split system air to air heat pump type SRK20HG S SRK28HG S SRK40HG S ...

Page 2: ...ure 12 4 5 Flap control 12 4 6 Timer operation 13 4 7 Outline of heating operation 14 4 8 Outline of cooling operation 17 4 9 Outline of dehumidifying operation 18 4 10 Outline of automatic operation 19 4 11 Outline of clean operation 19 4 12 Protective control function 20 5 APPLICATION DATA 22 5 1 Selection of location for installation 23 5 2 Installation of indoor unit 24 5 3 Installation of out...

Page 3: ...e control switch is set 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 typ...

Page 4: ...l 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 cor...

Page 5: ...orber Cushion rubber for compressor Electric heater Operation control 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 Nec...

Page 6: ...ration absorber Cushion rubber for compressor Electric heater Operation control 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 Insu...

Page 7: ...oor 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 ...

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: ...lve Piping Liquid ø6 35 Heat exchanger sensor Piping Gas ø9 52 Service valve Gas Check joint 4 way valve Service valve Liquid Strainer Capillary tube Capillary tube Compressor Accumulator Discharge temp sensor Muffler Heat exchanger sensor Heat exchanger Outdoor air temp sensor Cooling cycle Heating cycle Models SRK20HG S 28HG S 40HG S ...

Page 10: ...so with respect 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 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 2070 0 975 1 0 2018 W SRK20HG S Factor by air temperatures 15 ISO T1 Standard Condition Outdoor air W B t...

Page 11: ...e 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 Th2 Heat exch sensor Indoor unit Th4 Th5 Th6 ZNR 20S DS 52X1 3 Heat exch sensor Outdoor unit TB Terminal block 52C 51C Outdoor air temp sensor Discharge pipe temp sensor Var...

Page 12: ...N 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 air ...

Page 13: ...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 14: ...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 15: ...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 16: ... 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 Sw...

Page 17: ...tinuously 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 3 except that the outdoor heat exchanger sensor temperature is 1ºC and 5 above and the outdoor ...

Page 18: ... 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 19: ...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 20: ...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 21: ...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 22: ...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 Compress...

Page 23: ...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 24: ...ective 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 care that wiring does not rise upward and accurately install the lid servic...

Page 25: ...ause no trouble A place where there 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 fr...

Page 26: ...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 Mating mark for level surface Level position 2 locations 450 Look for the inside wall structures Intersediate support or pillar and firaly install the unit after level surface has be...

Page 27: ...00 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 Always tape the cro...

Page 28: ... 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 29: ...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 1 mm Gas side ø9 52 13 2 mm ø12 7 16 6 mm Press Remove Remove Do not turn Spanner for fixing the piping Torque wrench Specified torquing value Liquid side ø6 35 14 1...

Page 30: ...ng in diameter from those found on the conventional models a charge hose for R22 presently in use is not applicable Please use one designed specifically for R410A Please use an anti reverse flow type 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 refrige...

Page 31: ... 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 sensing elemen...

Page 32: ...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 33: ...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 34: ...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 35: ... 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 36: ...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 37: ...hen 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 liquid refrigerant begins flowing from the cylinder into the unit Be sure to erect the refrigerant cylinder upright to let liquid refrigerant flow into the unit f When refrigerant has been charged into the system to some extent r...

Page 38: ...es Pseudo azeotropic characteristics R410A is a pseudo azeotropic mixed refrigerant composed of two constituents R32 and R125 Quasi azeotropic condition refers to a state in which the dew point curve and boiling point curve gas liquid equilibrium curves pressure constant almost lie on top of each other and a multi constituent refrigerant having this chemical characteristic incurs less composition ...

Page 39: ...oisonous gas may occur 5 When an air conditioning system charged with a large volume of refrigerant e g multi type air conditioner is installed in a small room it is necessary to exercise care so that even when refrigerant leaks its concentration does not exceed the marginal level If the refrigerant gas leakage occurs and its concentration exceeds the marginal level an oxygen starvation accident m...

Page 40: ...nce outer diameter Minimum joint thickness diameter of copper pipe jointed mm mm 1 4 6 35 0 50 3 8 9 52 0 60 1 2 12 70 0 70 5 8 15 88 0 80 7 2 2 Processing of piping materials When performing the refrigerant piping installation care should be taken to ensure that water or dust does not enter the pipe interior that no other oil other than lubricating oils used in the installed air conditioner is us...

Page 41: ... 0 1 0 1 5 1 2 12 70 0 8 0 0 5 0 5 1 0 1 5 2 0 5 8 15 88 1 0 0 0 5 0 5 1 0 1 5 2 0 Fig 4 Relations between flare nut and flare seal surface 45 46 B A 43 45 C D Table 7 Flare and flare nut dimensions for R410A Nominal Outer diameter Thickness Dimension mm Flare nut width diameter mm mm A B C D 1 4 6 35 0 8 9 1 9 2 6 5 13 17 3 8 9 52 0 8 13 2 13 5 9 7 20 22 1 2 12 70 0 8 16 6 16 0 12 9 23 26 5 8 15 ...

Page 42: ... and which contains less contaminants It is necessary to carefully treat store copper pipes so that they are not collapsed deformed or damaged Due care must also be exercised so that foreign matters such as dust and water do not enter the pipe interior A piping set s open end is sealed with a cap etc When storing it make sure that it is sealed securely When storing a cladded copper pipe or bare co...

Page 43: ...sing the connected parts As brazing is molten between the joined surfaces to yield high adhesive strength it is necessary to secure a wide enough space to be joined and also an adequate clearance between the joined surfaces Copper pipe joints minimum insertion depths outer pipe diameters and clearances between outer and inner pipe diameters are as shown in Table 10 In the case of bronze brazing fi...

Page 44: ...assium fluoride potas sium chloride and sodium fluoride to the borax boric acid compound Cautions 1 Remove the flux after brazing 2 When chlorine contained in the flux stays within the pipe the lubricating oil deteriorates So use a flux which does not contain chlorine 3 When adding water to the flux use water which does not contain chlorine e g distilled water or ion exchange water 4 Brazing As br...

Page 45: ... part from overheating damage or quality deterioration due to flame or heat take adequate steps for protection such as 1 by shielding with a metal plate 2 by using a wet cloth and 3 by means of heat absorbent 4 Movement during brazing Eliminate all vibration during brazing to protect brazed joints from cracking and breakage 5 Oxidation preventive In order to improve the brazing efficiency various ...

Page 46: ...wo types of electronic balance for refrigerant charging are available one for 10kg cylinder and the other for 20kg cylinder Electronic balance for 10kg cylinder precision 2g Electronic balance for 20kg cylinder precision 5g Refrigerant is charged manually by opening closing the valve d Torque wrench for nominal diameters 1 2 and 5 8 Along with changes in flare nut sizes for enhanced pressure resis...

Page 47: ...g for refrigerant cylinder According to the charge hose s cap size a charge port with 1 2 UNF 20 threads per inch and corresponding packing are required j Gas leakage detector A high sensitivity gas leakage detector exclusive for HFC refrigerant is used In the case of R410A the detection sensitivity is about 23g per year 2 General tools a Vacuum pump b Torque wrench for 1 4 opposite side 17 mm for...

Page 48: ...re to make setting so that liquid can be charged When using a cylinder equipped with a siphon liquid can be charged without turning it upside down b Connect the gauge manifold s charge hose to the electronic balance s connecting port 3 2 c Open the refrigerant cylinder s valve and after opening the charging valve a little close it 1 2 d After making zero 0 adjustment open the charging valve and by...

Page 49: ...he indoor outdoor units Caution When storing the indoor unit piping in its original position be careful not to break the piping 2 Installing the unit a Proceed with the installation following the steps described in 7 3 2 New installation work 7 3 4 Replacing the unit Never use the existing refrigerant piping Use a brand new refrigerant piping 1 when replacing the air conditioner using the conventi...

Page 50: ...preventing function float switch moisture indicator drier and other accessory functions should be adjusted or replaced where necessary 4 Electrical circuit b Checking the accessories to the refrigerant recovering equipment 2 Preparations for recovering procedures a Installation of refrigerant recovering equipment Install the equipment in a place which satisfies the following requirements as much a...

Page 51: ...ccessories tools are required Shown below are standard accessories 1 Recovering cylinder Use a recovering cylinder designated by the equipment manufacturer A detachable cylinder must be such that it complies with the laws and regulations concerned Do not use an ordinary cylinder as a recovering cylinder Note 1 A cylinder available when R410A was purchased is a borrowed one Note 2 As a cylinder ava...

Page 52: ...piercing valve a A tool used to make a hole for recovery in the copper pipe when recovering R410A from equipment which has no port for charging or recovering gas Various types are available on the market and given various names b As the piercing edge tends to wear it is necessary to treat this valve as semi expendables c As vacuum rises air tends to be inhaled from the hole So care must be exercis...

Page 53: ... 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 ...