Mitsubishi Heavy Industries SRC20ZFX-S, Technical Manual

Page 1: ... 3 INVERTER WALL MOUNTED TYPE ROOM AIR CONDITIONER Split system air to air heat pump type SRK20ZFX S 25ZFX S 35ZFX S 50ZFX S TECHNICAL MANUAL Collection data Manual No 06 SRK T 051 ...

Page 2: ...e of clean operation 15 4 9 Outline of heating operation 16 4 10 Outline of cooling operation 18 4 11 Outline of dehumidifying operation 19 4 12 Outline of automatic operation 21 4 13 ECONOMY operation 21 4 14 Protective control function 22 5 APPLICATION DATA 29 5 1 Selection of location for installation 30 5 2 Installation of indoor unit 31 5 3 Installation of outdoor unit 34 5 4 Refrigerant pipi...

Page 3: ...uzzy rules in order to control the air capacity and the inverter frequency 3 Remote control flap louver The Flap louver can be automatically controlled by operating wireless remote control Flap swing The flaps swing up and down successively Louver swing The louvers swing left and right successively Memory flap Once the Flap louver position is set the unit memorizes the position and continues to op...

Page 4: ...sorber 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 54 m Gas line 0 47 m Insulation N...

Page 5: ...Operation switch Wireless Remote control Room temperature control Microcomputer thermostat Pilot light 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 54 m Gas line 0 47 m Insulation Necessary Both sides Drain hose Connectable Power source cord 2 m 3 cor...

Page 6: ...Operation switch Wireless Remote control Room temperature control Microcomputer thermostat Pilot light 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 54 m Gas line 0 47 m Insulation Necessary Both sides Drain hose Connectable Power source cord 2 m 3 cor...

Page 7: ...peration 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 054 m Gas line 0 47 m Insulation Necessary Both sides Drain hose Connectable Power source...

Page 8: ...ion 10 min Max 7 times h Inching prevention 5 min Outdoor air temperature Upper lower limits Vertical height difference between outdoor unit and indoor unit Max 10m Outdoor unit is higher Max 10m Outdoor unit is lower Max 25m Max 15m Outdoor unit is higher Max 15m Outdoor unit is lower Item Models 2 3 Exterior dimensions 1 Indoor unit Models All models 840 298 A Piping hole right 259 9 44 right 67...

Page 9: ... 16x12 61 9 139 3 33 3 Flare connection ø6 35 1 4 Service valve Liquid 4 0 4 0 Flare connecting ø9 52 3 8 Service valve Gas Terminal block Drain holes 286 4 12 50 290 49 6 43 5 850 203 1 510 136 9 476 2 16 12 314 12 328 Terminal block Service valve Liquid ø6 35 1 4 Service valve Gas ø12 7 1 2 Ground terminal 124 34 6 20 2 0 42 7 100 3 15 640 14 Model SRC50ZFX S ...

Page 10: ...sor Capillary tube Strainer Accumulator Service valve Gas Electronic expansion valve Piping Gas ø9 52 Model SRK50ZFX S Outdoor unit Indoor unit Room temp sensor Heat exchanger Flare connection Heat exchanger sensor Piping Liquid ø6 35 Check joint 4 way valve Service valve Liquid Flare connection Discharge pipe temp sensor Cooling cycle Heating cycle Outdoor air temp sensor Heat exchanger Heat exch...

Page 11: ... exchanger How to obtain the cooling and heating capacity Example The net cooling capacity of the model SRK35ZFX 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 3500 0 975 1 0 3413 W SRK35ZFX S Length 15m Factor by air temperatures 0 6 0 7 0 8 0 9 1 0 1 2 1 1 1 3 0 5 10 15 Coefficient of cooling Heating capacity in...

Page 12: ... P Power transistor 20S 52C EEV FMo DS CM 1 2 3 FM I SM CNX LM Display Wireless R Amp Black Brown Red Blue White Yellow Green BK BR RD BL WH Y GN Color symbol Meaning of marks Symbol Parts name CM Compressor motor F Fuse FM I Fan motor Outdoor Fan motor Indoor FMo F SM LM Flap motor Louver motor Symbol Parts name Th 1 Room temp sensor Th 2 Heat exchanger sensor Indoor unit Th 4 Heat exchanger sens...

Page 13: ...tor Indoor FMo F SM LM L Flap motor Louver motor Inductor Symbol Parts name Th 1 Room temp sensor Th 2 Heat exchanger sensor Indoor unit Th 3 Humidity sensor Th 4 Heat exchanger sensor Outdoor unit Th 5 Outdoor air temp sensor Th 6 Discharge pipe temp sensor Symbol Parts name ZNR Varistor 20S 4 way valve coil 52C Magnetic contactor DS Diode stack EEV Electronic expansion valve N_1 P_1 BK RD N_1 P_...

Page 14: ... mode ON TIMER button This button selects ON TIMER operation TEMPERATURE button This button sets the room temperature This button changes the present time and TIMER time OFF TIMER button This button selects OFF TIMER operation RESET switch Switch for resetting microcomputer OPERATION MODE indicator Indicates selected operation with lamp Auto Cool Heat Dry TEMPERATURE indicator Indicates set temper...

Page 15: ...o 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 Timer settings b High power operations Notes 1 The power blackout auto restart 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 Whe...

Page 16: ... 1 Remove the battery 2 Cut the jumper wire shown in the figure at right Jumper wire J6 Slant forward blowing HEAT 4 5 Flap and louver control Control the flap and louver by AIRFLOW UP DOWN and LEFT RIGHT button on the wireless remote control 1 Swing flap Flap moves in upward and downward directions continuously 2 Swing louver Louver moves in left and right directions continuously 3 When not opera...

Page 17: ...emp Setting temp 1 At cooling 5 No change 5 3 Setting temp Room temp 2 Setting temp Room temp 3 Setting temp Room temp 2 At heating 5 No change 5 Notes 1 At 5 minutes before the timer ON time operation starts regardless of the temperature of the room temperature sensor Th1 2 This function does not operate when in the Dry or Auto Dry mode However the operation in item 1 does operate in the Auto Dry...

Page 18: ... heating operation 1 Operation of major functional components in heating mode 2 Air flow selection a Speed of inverter changes within the range of selected air flow b When the defrosting protection device etc is actuated operation is performed in the corresponding mode c Outdoor unit blower operates in accordance with the inverter command speed 3 Details of control at each operation mode pattern a...

Page 19: ... 0 C 50 type 4 0 C 5 During continuous compressor operation In addition when the speed command from the indoor controller of the indoor unit during heating operation has counted 0 rps 10 times or more and all conditions of 1 2 and 3 above are satisfied note that when the temperature for Th4 is 5 C or less 62 rps or more 4 C or less less than 62 rps defrost operation is started ii Operation of func...

Page 20: ... 0 Corresponding to speed OFF OFF ON 4 way valve Final defrost operation Defrost control Hot keep Indoor unit Outdoor unit 75 sec Hot keep 60 sec Normal heating operation restored Defrost end Th4 13 C 10 minutes Defrost operation Defrost operation preparation 6th speed 6th speed 4 10 Outline of cooling operation 1 Operation of major functional components in cooling mode 50 type Item Indoor fan mot...

Page 21: ...2rps Air flow 7th speed fixed Inverter command speed 20 44rps 20 56rps 20 58rps 20 62rps Air flow 5th speed fixed Inverter command speed 20 30rps 20 34rps 20 38rps 20 30rps Air flow 2nd speed fixed c Cooling HIGH POWER operation HI POWER button on remote control ON The unit is operated continuously for 15 minutes regardless of the setting temperature 1 Detail of operation Model SRK20ZFX S 25ZFX S ...

Page 22: ...utdoor fan Determination of cooling oriented dehumidifying operation range Temperature check 5 min 5 min 5 min 5 min Operation pattern O L M Low 1 0 High Room temperature Setting temperature deg Operation range Heating operation O range L range M range 4th speed OFF OFF 4th speed 2nd speed 1st speed 20 25 35 type 38 50 type 28 20 25 35 type 30 50 type 20 20 25 35 type 48 50 type 44 0 50 type 4th s...

Page 23: ... adjusted within the following range There is the relationship as 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 19 20 21 22 23 24 25 26 27 28 29 30 31 temperature Dehumidifying 19 20 21 22 23 24 25 26 27 28 29 30 31 Heating 20 21 22 23 24 25 26 27 28 29 30 31 32 4 13 EC...

Page 24: ...d Humidity 68 73 50 rps 30 rps Inverter command speed at upper limit 4 14 Protective control function 1 Frost prevention for indoor heat exchanger During cooling or dehumidifying a Operating conditions i Indoor heat exchanger temperature detected with Th2 is lower than 5ºC ii 10 minutes after reaching the inverter command speed except 0 rps b Detail of anti frost operation 5 C or lower 2 5 C or lo...

Page 25: ...esistor and if the current exceeds the setting value the compressor is stopped immediately Simultaneously a red LED on the printed circuit board provided on the outdoor unit controller flashing for 0 5 second at intervals of 8 seconds Operation starts again after a delay time of 3 minutes 10 Heating overload protective control a Operating conditions When the unit is operating with the outdoor unit...

Page 26: ...0 80 ºC or greater but less than 100 90 ºC even when the inverter command speed is maintained for 3 minutes when the temperature is 90 80 ºC or greater but less than 100 90 ºC the speed is raised by 2 rps and kept at that speed for 3 minutes This process is repeated until the command speed is reached 4 Lower Limit Speed Cooling Heating 20 25 35 type 20 30 50 type 22 38 5 Values in are for Type 50 ...

Page 27: ... a Purpose Prevents anomalous high pressure operation during heating b Detector Indoor unit heat exchanger sensor Th2 c Detail of operation 16 Heating low outdoor temperature protective control 20 35 type I a Operating conditions When the outdoor air temperature sensor Th5 is 10ºC or lower continues for 5 minutes while the outdoor speed is other than 0 rps b Operation content When the command spee...

Page 28: ...outdoor temperature protective control I a Operating conditions When the outdoor air temperature sensor Th5 is 22ºC or lower continues for 30 seconds while outdoor speed is other than 0rps b Detail of operation After the outdoor fan operates at 2nd Th5 10 C or 1 st Th5 10 C speed for 60 seconds the corresponding outdoor heat exchanger temperature shall implement the following controls 1 Outdoor he...

Page 29: ...per limit 40rps Lower limit 30rps ON ON Upper limit 60rps Lower limit 30rps Outdoor air temp C c Reset conditions When the either of the following condition is satisfied 1 When the outdoor air temperature sensor Th5 becomes 25ºC or higher 2 When the inverter command speed is 0rps 50 type 1 The lower limit of inverter command speed is set to 30 44 rps and even if the speed becomes lower than 30 44 ...

Page 30: ...t by outdoor unit protective function Function Operation Heating heating Cooling cooling Heating heating Cooling cooling oriented dehumidifying oriented dehumidifying oriented dehumidifying oriented dehumidifying Stop Full stop Stop Full stop Stop Restart Stop Restart 0 rps command 0 rps command 0 rps command 0 rps command Inverter speed Indoor fan Indoor power relay Outdoor fan 4 way valve Comman...

Page 31: ...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 service panel It s improper installation can also resul...

Page 32: ...m One way piping length R 15 m 25 m Outdoor unit is lower 10 m 15 m Outdoor unit is higher 10 m 15 m r h Left side Right side 5 cm 10 cm 1 5 cm 4 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 or ...

Page 33: ...ve 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 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...

Page 34: ...ample or 245IEC57 H Harmonized cable 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 Clamp Lid Terminal block When the hose is extended to left and taken out from the rear center Piping Drain hose...

Page 35: ...oor unit How to remove the indoor unit from the installation board 1 Remove the right and left lids 2 At the marked portion of the indoor unit base lower latch pull downward with fingers both right and left hand sides The indoor unit base lower latch can be removed from the installation board Lid left The marked portion of the indoor unit base lower latch Lid right Installation board Installation ...

Page 36: ... indoor wiring code whether connect the leakage breaker or not 5 4 Refrigerant piping 1 Preparation Keep the openings of the pipes covered with tapes etc to prevent dust sand etc from entering them Indoor unit side Outdoor unit side 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 th...

Page 37: ...cifically 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 refrigerant charge 20 35 type Additional refrigerant charge is not required at all 50 type When refrigerant piping exceeds 15m conduct additional refr...

Page 38: ... 24 26 Cooling 2 1 2 0 1 9 2 5 2 4 2 3 4 2 4 0 3 8 7 5 7 2 6 9 Running current A Heating 2 5 2 4 2 3 2 9 2 8 2 7 4 9 4 7 4 5 7 9 7 6 7 3 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 Temp difference between return air and supply air C High p...

Page 39: ...gerant service valve 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 1 The...

Page 40: ...ble and perform an operation check The air conditioning system is operating normally 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 Using the Service Mode access the self diagnosis displays generated in the past Using the Service Mode access the stop history due to protection contro...

Page 41: ...rvice valve Indoor fan motor error Over heat of compressor When a sensor wire disconnection is detected while operation is stopped If a temperature of 50 C or lower is detected for 15 seconds it is judged that the wire is disconnected Not displayed during operation Broken heat exchanger sensor wire poor connector connection Outdoor heat exchanger sensor error When an outdoor air temperature sensor...

Page 42: ...ng are recorded when trouble occurs so more detailed information can be checked These are the data which display the reason by a stop occurred when the air conditioning system performed protective stops etc in the past Even if stop data alone are generated the system restarts automatically After executing the stop mode while the display is normal the system restarts automatically Data for up to 10...

Page 43: ...e remote control information at the time the error code was displayed in the past Displays the outdoor air temperature sensor temperature at the time the error code was displayed in the past Displays the outdoor heat exchanger sensor temperature at the time the error code was displayed in the past Displays the discharge pipe sensor temperature at the time the error code was displayed in the past C...

Page 44: ...0 V When it is judged that the power transistor was damaged at the time the compressor started When it is judged that the power transistor was damaged at the time the compressor started When PWM calculation results of 0 continue for 3 minutes or longer When PWM calculation results of 90 and an input current lower than the set value continue for 3 minutes or longer When an abnormal stop occurs 3 ti...

Page 45: ...ess than 16 rps Protective control operation Indoor unit fan motor is abnormal Discharge pipe sensor is abnormal anomalous stop Indoor heat exchanger sensor is abnormal anomalous stop Heat exchanger sensor is abnormal anomalous stop Anti condensation control Anti frost control High pressure control Compressor overheating protection control Refrigeration cycle system protective control 16 rps or hi...

Page 46: ...number of times in If no is displayed the error display shows that the trouble has occurred once Notes 3 Automatic Recovery Does not occur Automatic recovery occurs iv Remote control information tables 1 Operation switching RUN light Operation switching Display pattern when in service mode Operation switching when there is an abnormal stop 0 1 2 4 AUTO DRY COOL HEAT 2 Fan speed switching TIMER lig...

Page 47: ...26 36 46 56 66 76 86 96 57 47 37 27 17 7 7 17 27 37 47 57 67 77 87 97 58 48 38 28 18 8 8 18 28 38 48 58 68 78 88 98 59 49 39 29 19 9 9 19 29 39 49 59 69 79 89 99 No does not sound If no data are recorded error code is normal the display for each sensor becomes as shown below Sensor name Room temperature sensor temperature Indoor heat exchanger sensor temperature Outdoor air temperature sensor temp...

Page 48: ...114 134 56 36 16 16 36 56 76 96 116 136 58 38 18 18 38 58 78 98 118 138 No does not sound If no data are recorded error code is normal the display for each sensor becomes as shown below Sensor name Discharge pipe sensor temperature Sensor value displayed when the error code is normal 64 C Example Outdoor discharge pipe temperature 122ºC In the case of discharge pipe data multiply the reading value...

Page 49: ...eat exchanger sensor temperature on fourth previous occasion Remote control information on fourth previous occasion Outdoor air temperature sensor temperature on fourth previous occasion Outdoor heat exchanger sensor temperature on fourth previous occasion Discharge pipe sensor temperature on fourth previous occasion Error code on fifth previous occasion Room temperature sensor temperature on fift...

Page 50: ...emperature C Resistance kΩ Temperature C Resistance kΩ 0 164 70 8 7 5 127 75 7 3 10 99 80 6 2 15 78 85 5 3 20 62 90 4 5 25 50 95 3 9 30 40 100 3 3 35 32 105 2 9 40 26 110 2 5 45 21 115 2 2 50 17 120 1 9 55 14 125 1 6 60 12 130 1 4 65 10 135 1 3 Discharge pipe sensor temperature characteristics YES YES NO NO YES NO Check compressor wiring visually Check insulation resistance 1 MΩ or over Check coil...

Page 51: ...y tube or strainer defective EEV etc 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 YES NO NO NO Is DC 0 Approx 12V...

Page 52: ...and outdoor unit circuit board separately 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 indoor fan motor Notes 1 See pages 52 for the DC fan motor a...

Page 53: ... sensor is included in the 50 type only 1 Humidity sensor operation Failure mode Control input circuit reading Air conditioning system operation 1 Disconnected wire Humidity reading is 0 Operates in the Dry region 2 Disconnected wire Humidity reading is 0 Operates in the Dry region 12 Disconnected wire Humidity reading is 0 Operates in the Dry region 1 and 2 are short Humidity reading is 100 Opera...

Page 54: ... 2 Check the voltage on the terminal block Power supply Between 1 2 AC 220 240V Signal Between 2 3 Changing between DC 0 Approx 12V b Indoor unit fan motor check procedure This is a diagnostic procedure for determining if the indoor unit s fan motor or the circuit board is broken down i Indoor unit printed circuit board output check 1 Turn off the power 2 Remove the front panel then disconnect the...

Page 55: ...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 56: ...lied to the electronic expansion valve when the valve opening is being changed Red to White Red to Orange Brown to Yellow Brown to Blue Normal if there is approximately DC 5 V 10 seconds after the power asupply is turned on Color symbol BK RD WH Y GN Black Red White Yellow Green Inspection of input to PCB Check the voltage between terminals 1 2 on the terminal block It is normal if AC 220 230 240V...

Page 57: ...on of input to PCB Check the voltage between terminals 1 2 on the terminal block It is normal if AC 220 230 240V is detected Inspection of serial signal Check the voltage between terminals 2 3on the terminal block It is normal if the needle swing in the range of DC 0 Approx 12V CAUTION HIGH VOLTAGE High voltage is produced in the control box Don t touch electrical parts in the control box for 5 mi...

Page 58: ...l it means that the fan motor is faulty Measuring Point Resistance when Normal 6 4 Red Black 25 MΩ or higher 3 4 White Black 30 kΩ or higher FM0 Outdoor unit circuit board DC several V 4 7 V CNA DC15V DC308 336V GND Blue Yellow White Black Red 1 2 3 4 5 6 1 2 3 4 5 6 Outdoor unit fan motor check procedure This is a diagnostic procedure for determining if the outdoor unit s fan motor or the circuit...

Page 59: ...en 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 re...

Page 60: ...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 61: ...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 62: ...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 63: ...e 1 4 6 35 0 8 0 0 5 1 0 1 5 1 5 2 0 3 8 9 52 0 8 0 0 5 1 0 1 5 1 5 2 0 1 2 12 70 0 8 0 0 5 1 0 1 5 2 0 2 5 5 8 15 88 1 0 0 0 5 1 0 1 5 2 0 2 5 Table 6 Dimensions related to flare processing for R22 Nominal Outer diameter Thickness A mm diameter mm mm Flare tool for R410A Conventional flare tool Clutch type Clutch type Wing nut type 1 4 6 35 0 8 0 0 5 0 5 1 0 1 0 1 5 3 8 9 52 0 8 0 0 5 0 5 1 0 1 0...

Page 64: ... 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 65: ...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 66: ...assium fluoride potassium 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 bra...

Page 67: ...t 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 types of antioxidant are available on the market However the con stituents of these are widely varied and some are anticipated to corrode the piping materials or advers...

Page 68: ...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 69: ...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 70: ...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 71: ...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 72: ... 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 ...

Page 73: ...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 74: ...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 75: ... 2 INVERTER WALL MOUNTED TYPE ROOM AIR CONDITIONER Air Conditioning Refrigeration Systems Headquarters 16 5 2 chome Kounan Minato ku Tokyo 108 8215 Japan Fax 03 6716 5926 ...