INSTALLATION MANUAL Split-type Air-Conditioner
Contents
1. Indoor outdoor unit connecting wire lt OUTDOOR UNIT gt e E A E E a a e I A ee B ee C ee D a E foe bat tae for ew 3 F 2 7 l l S1283 E S118283 S1S2S3 S1S2S3 S1823 LIN I 15mm _ i 35 mm I L PER EEEE E S pare ca yee A VEE E A ral ered AE AS L ONES EET pees EERE me a a a ae a a a ae a raa Lead wi H arH tartara IL w I I I I i Sis2s3 j sisas i sA sisgsy sisasa POWER SUPPLY i i i i N 230 V 50 Hz iA UNIT B UNIT 1 G UNIT 1 D UNIT 4E UNIT I Pa ae Ji J J E unit is for 5A100VA only Make earth wire a little longer than others More than 35 mm e For future servicing give extra length to the connecting wires lt INDOOR UNIT gt 3 FLARING WORK AND PIPE CONNECTION 3 1 FLARING WORK 1 Cut the copper pipe correctly with pipe cutter Fig 1 2 2 Completely remove all burrs from the cut cross section of pipe Fig 3 Good No good e Put the end of the copper pipe to downward direction as you Copper 90 remove burrs in order to a2. tin plated or metal netting use a chemically treated wooden piece 20 mm or thicker between he wall and the piping or wrap 7 o 8 turns of insulation vinyl tape around the piping To use existing piping perform COOL operation for 30 minutes and pump down before removing he old air conditioner Remake flare according to the dimension or new refrigerant More than 100 mm More than 200 mm if there are obstacles to both sides Units should be installed by licensed contractor according to local code requirements 200 mm Po AA Outdoor unit installation 900 mm 500 mm Base bol Air inlet Z Air inlet D gt 320 mm 355 mm 387 mm oval hole Po Air outlet e 2 12 mm x 36 mm s Base bolt M10 2 U shape notched holes Po M10 1 7 MOUNTING ARRANGEMENT OF DRAIN SOCKET Please perform the drain piping work only when draining from one place 1 Choose one hole to discharge drain and install the drain socket to the hole 2 Close the rest of the hole s with the drain caps After the leak test apply insulat ACCESSORIES Check the following parts before installation 1 Drain socket 1 2 Drain cap 2 PARTS TO BE PROVIDED AT YOUR SITE A Power supply cord 1 B Indoor outdoor unit connecting wire 1 C Extension pipe Refer to 1 5 1 D Wall hole cover 1 E Piping tape 1 Exte
3. all stop valves on both sides of gas pipe and liquid pipe Operating with out fully opening lowers the performance and this causes trouble 8 Refer to 1 4 and charge the prescribed amount of refrigerant if needed Be sure to charge slowly with liquid refrigerant Otherwise composition of the refrigerant in the system may be changed and af fect performance of the air conditioner 9 Tighten cap of service port to obtain the initial status 10 Leak test Compound pressure gauge for R410A Stop valve cap Torque 19 6 to 29 4 Nem 200 to 300 kgfecm 4 to 5 turns Cores 760 mmH Pressure gauge for R410A Gauge manifold valve for R410A Vacuum pump Handle High for R410A Close Open Sy Stop valve for GAS Handle Hexagonal wrench Charge hose for R410A Service port cap Torque 13 7 to 17 7 Nem 140 to 180 kgf cm Stop valve for LIQUID r When attaching the control valve to the service port valve core may de form or loosen if excess pressure is applied This may cause gas leak Precautions when using the control valve Control vave ene Service port When attaching the control valve to cn the service port make sure that the valve core is in closed position and then tighten part A Do not tighten part A or turn the body when valve core is in open position REA Charge hose Body for R410A 4 2 G
4. 9 MITSUBISHI ELECTRIC Split type Air Conditioner MXZ 4A80VA MXZ 5A100VA INSTALLATION MANUAL Refer to the installation manual of each indoor unit for indoor unit in stallation T BEFORE INSTALLATION sasicscccesecs ccnsendinsesereasint raseeateenneeiactaienaeteanseetaes 2 2 OUTDOOR UNIT INSTALLATION 0 0 ieee ee eect e entree sneer teeeteeeeeneeneeeenates 5 3 FLARING WORK AND PIPE CONNECTION i ci iiia 6 4 PURGING PROCEDURES LEAK TEST AND TEST RUN cee 6 FOR INSTALLER 4 BEFORE INSTALLATION 1 1 THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY Be sure to read THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY before installing the air conditioner Be sure to observe the warnings and cautions specified here as they include important items related to safety After reading this manual be sure to keep it together with the OPERATING INSTRUCTIONS for future reference A WARNING E Do not install the unit by yourself user Incomplete installation could cause fire or electric shock injury due to the unit falling or leakage of water Consult the dealer from whom you pur chased the unit or a qualified installer E Perform the installation securely referring to the installation manual Incomplete installation could cause fire or electric shock injury due to the unit falling or leakage of water E Install the unit securely in a place which can bear the weight of th
5. AS CHARGE Perform gas charge to unit 1 Connect gas cylinder to the service port of stop valve 2 Perform air purge of the pipe or hose coming from refrigerant gas cylinder 3 Replenish specified amount of the refrigerant while operating the air conditioner for cooling Note In case of adding refrigerant comply with the quantity specified for the refrigerating cycle CAUTION When charging the refrigerant system with additional refrigerant be sure to use liquid refrigerant Adding gas refrigerant may change the composi tion of the refrigerant in the system and affect normal operation of the air conditioner Also charge the system slowly otherwise the compressor will be locked To maintain the high pressure of the gas cylinder warm the gas cylinder with warm water under 40 C during cold season But never use naked fire or steam Union 1 Stop valve 1 Q Liquid pipe Union I I I I Indoor unit D C BIJA I I I I Union Stop valve with service port Gas pipe IX Refrigerant gas cylinder operating valve for R410A Gauge manifold valve for R410A Refrigerant gas cylinder for R410A with siphon Refrigerant liquid Electronic scale for I I refrigerant charging 4 3 LOCKING THE OPERATION MODE OF THE AIR CONDITIONER COOL DRY HEAT Descr
6. VA 230 V 50Hz 25A 3 core 2 5 mm 4 core 1 5 mm 25m 80m 15m 25 80 20 g m 1 Connect to the power switch which has a gap of 3 mm or more when open to interrupt the source power phase When the power switch is shut off it must interrupt all phases 2 Use wires in conformity with design 60245 IEC 57 3 Never use pipes with thickness less than specified The pressure resist ance will be insufficient 4 Use a copper pipe or a copper alloy seamless pipe 5 Be careful not to crush or bend the pipe during pipe bending 6 Refrigerant pipe bending radius must be 100 mm or more 7 If pipe length exceeds 40 m additional refrigerant R410A charge is re quired No additional charge is required for pipe length less than 40 m Additional refrigerant A x pipe length m 40 8 Insulation material Heat resisting foam plastic 0 045 specific gravity 9 Be sure to use the insulation of specified thickness Excessive thickness may cause incorrect installation of the indoor unit and insufficient thick ness may cause dew drippage 10 If the outdoor unit is installed higher than the indoor unit max height difference is reduced to 10 m 1 4 SELECTING PIPE SIZE AND OPTIONAL DIFFERENT DIAMETER JOINTS The diameter of connection pipes differs according to the type and capacity of indoor units Match the diameters of connection pipes for indoor and outdoor units according to the following table Ifthe diameter of
7. ation press the piping wiring cor rection switch SW871 again When the correction completed without error do not press the piping wiring correction switch SW871 again When the result was cannot be corrected press the piping wiring cor rection switch SW871 again to cancel this function Then confirm the wiring and piping combination in a conventional manner by operating the indoor units one by one The operation is done while the power is supplied Make sure not to contact parts other than the switch including the P C board This may cause electric shock or burn by hot parts and live parts around the switch Contacting the live parts may cause P C board damage To prevent electronic control P C board damage make sure to per form static elimination before operating this function e This function does not operate when the outside temperature is 0 C or below 4 7 EXPLANATION TO THE USER e Using the OPERATING INSTRUCTIONS explain to the user how to use the air conditioner how to use the remote controller how to re move the air filters how to remove or put the remote controller in the remote controller holder how to clean precautions for operation etc Recommend the user to read the OPERATING INSTRUCTIONS care fully LED indication during detection LED 1 Red 2 Yellow 3 Green Lighted Lighted Blinking Result of piping wiring correction function LED Res
8. cause an injury or leakage of water due to a fire an electric shock the unit falling etc E When plugging the power supply plug into the outlet make sure that there is no dust clogging or loose parts in both the outlet and the plug Make sure that the power supply plug is pushed complete ly into the outlet If there is dust clogging or loose parts on the power supply plug or the outlet it could cause electric shock or fire If loose parts are found on the power supply plug replace it Could lead to death serious injury etc A CAUTION E Install an earth leakage breaker depending on the installation place If an earth leakage breaker is not installed it could cause electric shock E Perform the drainage piping work securely according to the installa tion manual If there is defect in the drainage piping work water could drop from the unit soaking and damaging household goods Could lead to serious injury in particular environments when operated incorrectly E Attach the electrical cover to the indoor unit and the service panel to the outdoor unit securely If the electrical cover of the indoor unit and or the service panel of the outdoor unit are not attached securely it could result in a fire or an electric shock due to dust water etc E When installing or relocating the unit make sure that no sub stance other than the specified refrigerant R410A enters the refrigerant circuit Any presence of foreign subs
9. connection pipes does not match the diameter of pipe end connections use optional different diameter joints Indoor unit Sidoruk 22 25 35 50 60 71 Pipe size 6 35 9 52 6 35 12 7 6 35 15 88 9 52 15 88 liquid gas A UNIT 6 35 12 7 MAC A455JP Sips MAC A456JP PAC 493PI MAC A456JP B UNIT C UNIT DUNT 6 35 9 52 j MAC 454JP PAC SG76RJ PAC 493PI PAC SG76RJ E UNIT MXZ 5A100VA only 1 5 SELECTING THE INSTALLATION LOCATION e Where it is not exposed to strong wind Where airflow is good and dustless Where rain or direct sunshine can be avoided as much as possible e Where neighbours are not annoyed by operation sound or hot air Where rigid wall or support is available to prevent the increase of op eration sound or vibration e Where there is no risk of combustible gas leakage When installing the unit at a high level be sure to secure the unit legs Where it is at least 3 m away from the antenna of TV set or radio Op eration of the air conditioner may interfere with radio or TV reception in areas where reception is weak An amplifier may be required for the af fected device Install the unit horizontally e Please install it in an area not affected by snowfall or blowing snow In areas with heavy snow please install a canopy a pedestal and or some baffle boards Note It is advisable to make a piping loop near outdoor unit so as to reduce vib
10. e unit If the installation location cannot bear the weight of the unit the unit could fall causing injury E Perform electrical work according to the installation manual and be sure to use an exclusive circuit Do not connect other electrical appli ances to the circuit If the capacity of the power circuit is insufficient or there is incomplete electrical work it could result in a fire or an electric shock E Do not damage the wires by applying excessive pressure with parts or screws Damaged wires could cause fire E Be sure to cut off the main power in case of setting up the indoor P C board or wiring works Failure to do so could cause electric shock E Use the specified wires to connect the indoor and outdoor units se curely and attach the wires firmly to the terminal block connecting sections so the stress of the wires is not applied to the sections Incomplete connecting and securing could cause fire Do not install the unit in a place where inflammable gas may leak If gas leaks and accumulates in the area around the unit it could cause an explosion Do not use intermediate connection of the power cord or the exten sion cord and do not connect many devices to one AC outlet It could cause a fire or an electric shock due to defective contact defec tive insulation exceeding the permissible current etc E Be sure to use the parts provided or specified parts for the installa tion work The use of defective parts could
11. inal screw and connect indoor outdoor unit connecting wire B from the indoor unit correctly on the terminal block Be careful not to make mis wiring Fix the wire to the terminal block securely so that no part of its core is appeared and no external force is conveyed to the connecting section of the terminal block 3 Firmly tighten the terminal screws to prevent them from loosening Af ter tightening pull the wires lightly to confirm that they do not move 4 Perform 2 and 3 for each outdoor unit 5 Connect power supply cord A 6 Fix indoor outdoor unit connecting wire B and power supply cord A with the cable clamps 7 Close the service panel securely Make sure that 3 2 PIPE CONNEC TION is completed After making connections between both power supply cord A and indoor outdoor unit connecting wire B be sure to fix both cable and wire with cable clamps Power supply Connecting order Connect the terminal block in order from the A B and C unit side Terminal block for indoor outdoor unit o 9 JE ace 5A100VA U Z ho Service panel Cable clamp E unit is for 5A100VA only
12. iption of the function With this function you can lock the operation mode of the outdoor unit Once the operation mode is locked to either COOL DRY mode or HEAT mode the air conditioner operates in that mode only Initial setting is required to activate this function Please explain about this function to your customers and ask them whether they want to use it How to lock the operation mode 1 Be sure to turn off the main power for the air conditioner before mak ing the setting 2 Set the 1st Dip Switch of SW1 on the outdoor controller board to ON to enable this function 3 To lock the operation mode in COOL DRY mode set the 2nd Dip Switch of SW1 on the outdoor controller board to OFF To lock the op eration in HEAT mode set the same switch to ON 4 Turn on the main power for the air conditioner Outdoor unit sm ip swi swi ON ON 1234 1234 COOL DRY 4 4 LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT Description of the function With this function you can lower the operating noise of the outdoor unit when the operation load is small for example during nighttime in COOL mode However please note that the cooling and heating ca pacity can also be lowered if this function is activated Initial setting is required to activate this function Please explain about th
13. is function to your customers and ask them whether they want to use it How to lower the operating noise 1 Be sure to turn off the main power for the air conditioner before mak ing the setting 2 Set the 3rd Dip Switch of SW1 on the outdoor controller board to ON to enable this function 3 Turn on the main power for the air conditioner o a m mamen j a eo si red ooog 0 L O momomo omno m F iamen mwai asasi meee 1234 Lower the operating noise 4 5 CHANGING THE AMPERE LIMIT Description of the function With this function you can change the current that flows in the outdoor unit Note Use this function only when the amount of current exceeds the allowed value How to change the ampere limit 1 Be sure to turn off the main power for the air conditioner before mak ing the setting 2 Make the setting referring to the table below 3 Turn on the main power for the air conditioner SW 2 MXZ 5A100VA MXZ 4A80VA ON HUOOAY 10 5A 10 5A i123 456 ON UUDSE 15 5A 15 5A 123456 i i noua Factory setting Factory setting Foes Full Full 4 6 TEST RUN Be sure to perform the test run for each unit Make sure each indoor 5 unit operates properly following the installation man
14. nd rear side only The unit can be used by at taching an optional outdoor LLLLLLLLL LLL Aa A 100 or more blowing guide MAC 855SG 4 but both sides and top are open 00 or more 7 Blowing guide MAC 855SG 5 Service space Keep the service space as shown in the figure below for mainte nance Service space 100 or more 7 500 or more 100 or more 500 or more 350 or more gt lt e When installing the unit in an area that is enclosed on four sides such as a verandah be sure to leave move than 200 mm behind the unit as shown e When there is a lack of airflow or there is a possibility of becoming short cycle install an outlet guide and make sure there is enough space behind the rear side of the air inlet Note Make sure not to install several outdoor units sideways next to each other Window ae More than y 350 More than 200 More than 100 Less than 1 200 of the front surface side Unit mm 1 6 INSTALLATION DIAGRAM MXZ 4A80VA More than 100 mm Open as arule More than 500 mm if the back both sides and top are open sides are open SSS Open as a rule More than 500 mm if the front and both TI SSS More than 350 mm ing material tightly so that there is no gap When the piping is to be at ached to a wall containing metals
15. nsion drain hose F or soft PVC hose 15 mm inner 1 dia or hard PVC pipe VP16 F Little G Refrigeration oil amo nt H Putty 1 I Pipe fixing band 2to7 J Fixing screw for I 2to7 K Wall hole sleeve 1 L Soft PVC hose 25 mm inner dia or 1 hard PVC pipe VP25 Note Place indoor outdoor unit connecting wire B and power supply cord A at least 1 m away from the TV antenna wire The Q ty for B to K in the above table is quan tity to be used per indoor unit 3 Connect a vinyl hose of 25 mm in the inside diameter on the market with the drain socket and lead drain Note Do not use the drain socket and the drain cap in the cold region Drain may freeze and it makes the fan stop 2 OUTDOOR UNIT INSTALLATION 2 1 INSTALLING THE UNIT Be sure to fix the unit s legs with bolts when installing it Be sure to install the unit firmly to ensure that it does not fall by an earthquake or a gust Refer to the figure in the right for concrete foundation Do not use the drain socket and the drain cap in the cold region Drain may freeze and it makes the fan stop Fix here with M10 bolts Make the setting depth deeper Make with wider Anchor leg 25 or less Anchor both length Anchor both pitc h Unit mm Terminal block for power supply 2 2 CONNECTING WIRES FOR OUTDOOR UNIT 1 Remove the service panel 2 Loosen term
16. r and use the same tightening torque applied for indoor unit 3 3 INSULATION AND TAPING Cover piping joints with pipe cover For outdoor unit side surely insulate every piping including valves Using piping tape E apply taping starting from the entry of outdoor unit e Stop the end of piping tape E with tape with adhesive agent at tached e When piping have to be arranged through above ceiling closet or where the temperature and humidity are high wind additional com mercially sold insulation to prevent condensation 1 2 3 4 PURGING PROCEDURES LEAK TEST AND TEST RUN 4 1 PURGING PROCEDURES AND LEAK TEST 1 Remove service port cap of stop valve on the side of the outdoor unit gas pipe The stop valve will not work in its initial state fresh out of the factory totally closed with cap on 2 Connect gauge manifold valve and vacuum pump to service port of stop valve on the gas pipe side of the outdoor unit 3 Run the vacuum pump Vacuumize for more than 15 minutes 4 Check the vacuum with gauge manifold valve then close gauge mani fold valve and stop the vacuum pump 5 Leave as it is for one or two minutes Make sure pointer gauge mani fold valve remains in the same position Confirm that pressure gauge shows 0 101 Mpa Gauge 760 mmHg 6 Remove gauge manifold valve quickly from service port of stop valve 7 After refrigerant pipes are connected and evacuated fully open
17. ration transmitted from there FREE SPACE REQUIRED AROUND OUTDOOR UNIT 1 Top side obstacles When there is an obstacle behind the 100 or more rear side only it does not matter if there is an obstacle over the top side as shown in the figure below 500 or more 3 Obstacles on front blowing side only In this case the rear both sides and top should be open Uy 500 or more VL Note When operating the air conditioner in low outside temperature be sure to follow the instructions described below e Never install the outdoor unit in a place where its air inlet outlet side may be exposed directly to wind To prevent exposure to wind install the outdoor unit with its air inlet side facing the wall To prevent exposure to wind it is recommended to install a baffle board on the air outlet side of the outdoor unit Avoid the following places for installation where air conditioner trouble is liable to occur Where flammable gas could leak e Where there is much machine oil Salty places such as the seaside e Where sulfide gas is generated such as a hot spring Where there is high frequency or wireless equipment 2 Front blowing side open As long as space like the one shown in the figure can be maintained it does not mat 200 or more ter if there are obstacles in Yu y three directions but top side is open J g 100 or more 350 or more 4 Obstacles on front a
18. rench as specified in this manual If fastened too tight a flare nut may break after a long period and cause refrigerant leakage E The unit shall be installed in accordance with national wiring regu lations E Earth the unit correctly Do not connect the earth to a gas pipe water pipe lightning rod or tel ephone earth Defective earthing could cause electric shock E Do not touch the air inlet or the aluminum fins of the outdoor unit This could cause injury E Do not install the outdoor unit where small animals may live If small animals enter and touch the electric parts inside the unit it could cause a malfunction smoke emission or fire Also advise user to keep the area around the unit clean 1 2 REQUIRED TOOLS FOR INSTALLATION Phillips screwdriver Level Scale Utility knife or scissors Torque wrench Wrench or spanner Flare tool for R410A 1 3 SPECIFICATIONS 4 mm hexagonal wrench Gauge manifold for R410A Vacuum pump for R410A Charge hose for R410A Pipe cutter with reamer Power supply 1 Wire specifications 2 Pipe length and height difference 4 5 6 10 Model Rated Fre Breaker Indoor outdoor Max pipe length Max MAX nia Or DENOS Refrigerant adjust A Power supply a per indoor unit i 3 per indoor unit Voltage quency capacity connecting wire height difference ment A 7 for multi system for multi system MXZ 4A80VA A 2 25m 70m 15m 25 70 MXZ 5A100
19. tance such as air can cause abnormal pressure rise or an explosion Do not discharge the refrigerant into the atmosphere If refrigerant leaks during installation ventilate the room If refrigerant comes in contact with a fire harmful gas could be gener ated E Check that the refrigerant gas does not leak after installation has been completed If refrigerant gas leaks indoors and comes into contact with the flame of a fan heater space heater stove etc harmful substances will be generated E Use appropriate tools and piping materials for installation The pressure of R410A is 1 6 times more than R22 Not using appropri ate tools or materials and incomplete installation could cause the pipes to burst or injury E When pumping down the refrigerant stop the compressor before disconnecting the refrigerant pipes If the refrigerant pipes are disconnected while the compressor is run ning and the stop valve is open air could be drawn in and the pressure in the refrigeration cycle could become abnormally high This could cause the pipes to burst or injury E When installing the unit securely connect the refrigerant pipes before starting the compressor If the compressor is started before the refrigerant pipes are connected and when the stop valve is open air could be drawn in and the pres sure in the refrigeration cycle could become abnormally high This could cause the pipes to burst or injury E Fasten a flare nut with a torque w
20. ual attached to the fal i i m i H o unit If you perform the test run for all indoor units at once you cannot de tect any erroneous connection if any of the refrigerant pipes and the indoor outdoor unit connecting wires About the restart protective mechanism Once the compressor stops the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner CIOOOO O mannanna nanana nn Wiring piping correction function This unit has a wiring piping correction function which corrects wiring and piping combination When there is possibility of incorrect wiring and piping combination and confirming the combination is difficult use this function to detect and correct the combination by following the proce dures below eer wmn o Make sure that the following is done Power is supplied to the unit Stop valves are open Note During detection the operation of the indoor unit is controlled by the out door unit During detection the indoor unit automatically stops operation This is not a malfunction Procedure Press the piping wiring correction switch SW871 1 minute or more after turning on the power supply Correction completes in 10 to 15 minutes When the correction is com pleted its result is shown by LED indication Details are described in the following table To cancel this function during its oper
21. ult 1 Red 2 Yellow 3 Green Lighted Not lighted Lighted Completed Corrected successfully Blinking Blinking Blinking Cannot be corrected Refer to SAFETY PRECAUTIONS Other indications WHEN LED FLASHES located behind the service panel 10 This product is designed and intended for use in the residential commercial and light industrial environment The product at hand is based on Low Voltage Directive 73 23 EEC the following EU regulations e Electromagnetic Compatibility Directive 89 336 EEC aa MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN SG79Y865H01
22. void to let burrs drop in the piping Ke pipe a 3 Remove flare nuts attached to indoor and outdoor units then put them g z a on pipe having completed burr removal Not possible to put them on after flaring work Tilted Uneven Burred 4 Flaring work Fig 4 5 Firmly hold copper pipe in the dimension i shown in the table Select A mm from the table according to the tool Fig 1 Fig 2 5 Cee Flaring tool e Compare the flared work with Fig 6 Burr Se pipe If flare is noted to be defective cut off the flared section and do ae oe flaring work again ipe cutter B E A mm Tightening torque Clutch type Wing nut type Pipe diameter Nut Clutch Clutch Wing nut Fig 3 Fig 4 mm mm type tool type tool type tool Nem kgfecm for R410A for R22 for R22 A Inside is shin Smooth all ing without any 6 35 as 17 151020 13 7 to 17 7 140 to 180 pia scratches 9 52 3 8 22 0100 5 1 0t015 34 3 to 41 2 350 to 420 12 7 1 2 26 f 2 0 to 2 5 49 0 to 56 4 500 to 575 Die Copper pipe 015 88 5 8 29 73 5 to 78 4 750 to 800 eee Flare nut i 3 2 PIPE CONNECTION Fig 5 Fig 6 Fasten flare nut with a torque wrench as specified in the table When fastened too tight flare nut may brake after a long period and cause refrigerant leakage Outdoor unit connection Connect pipes to stop valve pipe joint of the outdoor unit in the same manner applied for indoor unit e For tightening use a torque wrench or spanne
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