Mitsubishi Heavy Industries SRC20ZGX-S, Technical Manual

Page 1: ... 3 INVERTER WALL MOUNTED TYPE ROOM AIR CONDITIONER Split system air to air heat pump type SRK20ZGX S 25ZGX S 35ZGX S 50ZGX S TECHNICAL MANUAL Collection data Manual No 07 SRK T 065 ...

Page 2: ...4 6 Timer operation 14 4 7 Outline of heating operation 15 4 8 Outline of cooling operation 16 4 9 Outline of automatic operation 16 4 10 Protective control function 17 5 APPLICATION DATA 22 5 1 Selection of location for installation 23 5 2 Installation of indoor unit 24 5 3 Installation of outdoor unit 27 5 4 Refrigerant piping 27 5 5 Test run 29 5 6 Precautions for wireless remote control instal...

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: ...ubber 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 Necessary Both si...

Page 5: ... 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 cores with Earth Re...

Page 6: ... 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 cores with Earth Re...

Page 7: ... 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 cord 2 m 3 core...

Page 8: ...e Voltage at starting Frequency of ON OFF cycle ON and OFF interval 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 A VIEW A ...

Page 9: ... 7 2 Outdoor unit Models SRC20ZGX S 25ZGX S 35ZGX S Model SRC50ZGX S ...

Page 10: ...sor Capillary tube Strainer Accumulator Service valve Gas Electronic expansion valve Piping Gas ø9 52 Model SRK50ZGX 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: ... to the frosting on the outdoor heat exchanger How to obtain the cooling and heating capacity Example The net cooling capacity of the model SRK35ZGX 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 SRK35ZGX S Length 15m Factor by air temperatures Coefficient of cooling Heating capacity in relat...

Page 12: ...15A F R IN C 2 S IN N P POWER TRANSISTOR U V W RD WH BK CM CND Th4 Th5 Th6 CNA FMO CNB 20S EEV DS L G G CNE 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 Th2 Compressor motor Fuse Fan motor Indoor Fan motor Outdoor Flap motor LM Louver motor Room temp sensor H...

Page 13: ...02 1 3 2 4 Meaning of marks Symbol Parts name Symbol Parts name Symbol Parts name CM F FMI FMO SM LM Th1 Th2 56 77 5 1 7 5 1 8 4 9 5 1 8 14 9 6 5 1 5 1 5 1 56 7 7 1 7 7 8 4 019 Th3 Th4 Th5 Th6 ZNR 20S EEV DS 50401 7 7 1 7 7 8 14 019 TB 50 3 14 0 1 56 7 7 07 2 606 1 56 7 7 071 8 0 9 1 0 6 70 0 4 71 L 1 FMO 20S EEV 8 9 8 9 L CM 8 9 52C ...

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 tempera...

Page 15: ...y prior to it being switched off by a power cut and then automatically resumes operations at that point after the power has been restored 2 The following settings will be cancelled a 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 ...

Page 16: ...inuously 3 When not operating The flap returns to the position of air flow directly below when operation has stopped 4 Memory flap Flap or Louver stopped When you press the AIRFLOW UP DOWN or LEFT RIGHT button once while the flap or louver is operating it stops swinging at an angle Since this angle is memorized in the microcomputer the flap or louver will automatically be set at this angle when th...

Page 17: ...frosting operation a Starting conditions Defrosting operation can be started only when all of the following conditions are met 1 After start of heating operation When it elapsed 35 minutes Accumulated compressor operation time 2 After end of defrosting operation When it elapsed 35 minutes Accumulated compressor operation time 3 Outdoor unit heat exchanger sensor Th4 temperature When the temperatur...

Page 18: ...re and the outdoor air temperature determines the operation mode and then begins in the automatic operation Heating Dehumidifying Cooling Room temperature C Outdoor temperature C 2 The unit checks the temperature every hour 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 one hour a...

Page 19: ... upper limit of control speed is 72 rps c Reset conditions When either of the following condition is satisfied 1 When the outdoor air temperature becomes 40ºC or less 2 When the inverter command speed is 0rps 3 Cooling low 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 othe...

Page 20: ...er sensor Th2 c Detail of operation Example Fuzzy Indoor unit heat exchanger temperature C Lower limit speed 20 35 rps After lapse of 20 Sec or over 2 After lapse of 20 Sec or over 2 After lapse of 20 Sec or over 2 B C 8 rps 1 8 rps 0 rps A Unit ºC II 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 ...

Page 21: ...ating conditions When the outdoor air temperature sensor Th5 is 10 4 ºC or lower continues for 5 minutes while the outdoor speed is other than 0 rps b Operation content When the command speed is less than 36 22 rps the command speed is forcibly set at 36 22 rps However when the thermo becomes OFF the speed is reduced to 0 rps c Reset conditions When the outdoor air temperature sensor Th5 becomes 7...

Page 22: ...arts again within 1 hour but there is no start at the third time 8 Current safe a Purpose Current is controlled not to exceed the upper limit of the setting operation current b Detail of operation Input current to the converter is monitored with the current sensor fixed on the printed circuit board of the outdoor unit and if the operation current value reaches the limiting current value the outdoo...

Page 23: ...nal cannot be received from the indoor control with outdoor control having serial signals continuously for 1 minute and 55 seconds the compressor is stopped After the compressor has been stopped it will be restarted after the compressor start delay if a serial signal can be received again from the indoor control 14 Rotor lock If the motor for the compressor does not turn 1 12 revolution 0 044 seco...

Page 24: ...lectric 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 result...

Page 25: ... 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 frequency of defr...

Page 26: ...ve length Adjust so that board will be level by turning the board with the standard hole as the center Standard hole c Install the sleeve Inserting sleeve Sleeve Inclined Sealing plate Note 1 Drill a hole with incline of 5 degree from indoor side to outdoor side Indoor side Outdoor side Cut off the sleeve collar in case of drawing piping out to rear Cut off the sleeve collar that can be seen from ...

Page 27: ...g to avoid loosening of the wires CENELEC code for cables Required field cables H05RNR4G1 5 Example 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 Termina...

Page 28: ...door 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 29: ...onal to decide by 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 t...

Page 30: ...ecifically 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 ref...

Page 31: ...llowing 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 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 moun...

Page 32: ...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 33: ...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 34: ...e dischargepipesensor closedservicevalve Indoorfanmotor error Overheatof compressor Whenasensorwiredisconnectionisdetectedwhileoperationis stopped IfatemperatureofÐ50 Corlowerisdetectedfor15seconds itisjudgedthatthewireisdisconnected Notdisplayedduringoperation Brokenheatexchangersensor wire poorconnector connection Outdoorheat exchangersensor error Whenanoutdoorairtemperaturesensorwiredisconnecti...

Page 35: ...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 36: ...D HI AUTO LO MED HI AUTO Displays the reason for stopping display in the past error code Displays the room temperature sensor temperature at the time the error code was displayed in the past Displays the indoor heat exchanger sensor temperature at the time the error code was displayed in the past Displays the remote control information at the time the error code was displayed in the past Displays ...

Page 37: ... longer When there is a current safe stop in current safe I mode during cooling operation When there is a current safe stop in current safe I mode during heating operation When there is a current safe stop in current safe II mode during cooling operation When there is a current safe stop in current safe II mode during heating operation When there is a current safe stop in current safe III mode dur...

Page 38: ...sh 5 time flash 6 time flash 7 time flash 8 time flash 2 time flash 3 time flash 4 time flash 5 time flash 6 time flash 0 1 0 1 2 3 4 5 6 7 6 8 3 5 9 5 5 2 8 0 0 8 0 0 8 0 Major category Number of flashes when in service mode Minor category Error content Stop code or Error code TIMER light 1 s digit RUN light 10 s digit Cause Occurrence conditions Error display Auto recovery 3 7 2 5 5 6 6 7 8 6 6 ...

Page 39: ...ccurred for the same reason has reached the 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 D...

Page 40: ...splay for each sensor becomes as shown below Sensor name Room temperature sensor temperature Indoor heat exchanger sensor temperature Outdoor air temperature sensor temperature Outdoor heat exchanger temperature Example Room temperature indoor heat exchanger outdoor air temperature outdoor heat exchanger 9ºC 0 5 sec 0 1 sec 1 5 sec Buzzer sound minus If the temperature is 0 the buzzer sounds If th...

Page 41: ... as shown below Sensor name Discharge pipe sensor temperature Example Outdoor discharge pipe temperature 122ºC In the case of discharge pipe data multiply the reading value by 2 Below 61 x 2 122ºC 0 5 sec 0 1 sec 1 5 sec 11 second interval 0 5 sec OFF ON OFF ON OFF ON Buzzer sound minus If the temperature is 0 the buzzer sounds If the temperature is 0 the buzzer does not sound RUN light 10Õs digit...

Page 42: ... 40 Service data record form 0 1 2 3 4 5 6 7 ...

Page 43: ...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 44: ...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 45 for the DC fan motor a...

Page 45: ...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 46: ...umidity 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 10...

Page 47: ... 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 48: ...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 49: ...o test if there is voltage Check point of outdoor unit 20 25 35 type If the expansion valve does not operate as shown above it is defective 1 0 2 3 4 0 5 0 0 6 7 0 4 8 4 4 3 2 9 4 2 Color symbol 8 8 4 Inspection of input to PCB 0 5 4 1 2 5 1 9 9 9 6 Inspection of serial signal 0 5 4 2 3 5 1 4 0 0 9 3 6 CAUTION HIGH VOLTAGE 0 0 5 3 5 3 ...

Page 50: ...n valve To test if there is voltage Check point of outdoor unit 50 type If the expansion valve does not operate as shown above it is defective Inspection of input to PCB 1 2 Inspection of serial signal 2 3 CAUTION HIGH VOLTAGE 0 1 2 3 1 1 1 Color symbol EEV FMo 20S F 250V 15A CM ...

Page 51: ...tdoor unit s fan motor or the circuit board is broken down Perform this check after checking if the indoor unit is normal i Outdoor unit printed circuit board output check 1 Turn off the power 2 Disconnect connector CNA for the fan motor in the outdoor unit 3 Turn on the power then press the unit ON OFF button continuously for 5 seconds or longer to turn the unit ON When an indoor unit operates if...

Page 52: ...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 53: ...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 54: ...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 55: ... generally used see Fig 2 Nominal Reference 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 use...

Page 56: ...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 57: ... 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 58: ...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 59: ...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 60: ...ion 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 types of antioxidant are available on the market However the con stituents of these are widely varied and s...

Page 61: ...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 62: ...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 63: ...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 64: ... Tighten the capped flare nuts at the indoor outdoor units connecting part with the specified torque Remove the 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 ...

Page 65: ... 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 66: ...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 67: ...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 68: ... 2 INVERTER WALL MOUNTED TYPE ROOM AIR CONDITIONER 0 1 ...