Daikin 4MWXM-A Installer'S Reference Manual Download Page 74

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Technical data

Installer reference guide

4MWXM-A

R32 Split series

4P678385-1A – 2022.02

Symbol

Meaning

Q*DI, KLM

Earth leak circuit breaker

Q*L

Overload protector

Q*M

Thermo switch

Q*R

Residual current device

Resistor

R*T

Thermistor

Receiver

S*C

Limit switch

S*L

Float switch

S*NG

Refrigerant leak detector

S*NPH

Pressure sensor (high)

S*NPL

Pressure sensor (low)

S*PH, HPS*

Pressure switch (high)

S*PL

Pressure switch (low)

S*T

Thermostat

S*RH

Humidity sensor

S*W, SW*

Operation switch

SA*, F1S

Surge arrester

SR*, WLU

Signal receiver

SS*

Selector switch

SHEET METAL

Terminal strip fixed plate

T*R

Transformer

TC, TRC

Transmitter

V*, R*V

Varistor

V*R

Diode bridge, Insulated-gate bipolar
transistor (IGBT) power module

WRC

Wireless remote controller

Terminal

X*M

Terminal strip (block)

Y*E

Electronic expansion valve coil

Y*R, Y*S

Reversing solenoid valve coil

Z*C

Ferrite core

ZF, Z*F

Noise filter

17.2 Piping diagram: Outdoor unit

Component PED category classification:

▪

High pressure switches: category IV

Summary of Contents for 4MWXM-A

Page 1: ...Installer reference guide R32 Split series 4MWXM52A2V1B ...

Page 2: ... the installation structure 29 6 3 4 To install the outdoor unit 30 6 3 5 To provide drainage 30 6 3 6 To prevent the outdoor unit from falling over 31 7 Piping installation 33 7 1 Preparing refrigerant piping 33 7 1 1 Refrigerant piping requirements 33 7 1 2 Refrigerant piping insulation 34 7 1 3 Refrigerant piping length and height difference 34 7 2 Connecting the refrigerant piping 35 7 2 1 Abo...

Page 3: ... 59 12 4 Checklist during commissioning 59 12 5 Trial operation and testing 59 12 5 1 About wiring error check 60 12 5 2 To perform a test run 61 12 6 Starting up the outdoor unit 62 13 Hand over to the user 63 14 Maintenance and service 64 14 1 Overview Maintenance and service 64 14 2 Maintenance safety precautions 64 14 3 Checklist for yearly maintenance of the outdoor unit 65 14 4 About the com...

Page 4: ...piping to the indoor unit connecting the electrical wiring to the indoor unit see the installation manual of the indoor unit Documentation set This document is part of a documentation set The complete set consists of General safety precautions Safety instructions that you MUST read before installing Format Paper in the box of the outdoor unit Outdoor unit installation manual Installation instructi...

Page 5: ... serious injury WARNING FLAMMABLE MATERIAL CAUTION Indicates a situation that could result in minor or moderate injury NOTICE Indicates a situation that could result in equipment or property damage INFORMATION Indicates useful tips or additional information Symbols used on the unit Symbol Explanation Before installation read the installation and operation manual and the wiring instruction sheet Be...

Page 6: ...t the documentation Installer reference guide 6 4MWXM A R32 Split series 4P678385 1A 2022 02 Symbol Explanation Indicates a table title or a reference to it Example 1 3 Table title means Table 3 in chapter 1 ...

Page 7: ...pplied materials comply with applicable legislation on top of the instructions described in the Daikin documentation CAUTION Wear adequate personal protective equipment protective gloves safety glasses when installing maintaining or servicing the system WARNING Tear apart and throw away plastic packaging bags so that nobody especially children can play with them Possible risk suffocation WARNING P...

Page 8: ...es where there is a risk of fire due to the leakage of flammable gases example thinner or gasoline carbon fibre ignitable dust In places where corrosive gas example sulphurous acid gas is produced Corrosion of copper pipes or soldered parts may cause the refrigerant to leak Instructions for equipment using R32 refrigerant WARNING MILDLY FLAMMABLE MATERIAL The refrigerant inside this unit is mildly...

Page 9: ...esigned and installed such as to minimise the likelihood of hydraulic shock damaging the system The indoor equipment and pipes shall be securely mounted and guarded such that accidental rupture of equipment or pipes cannot occur from events such as moving furniture or reconstruction activities CAUTION Do NOT use potential sources of ignition in searching for or detection of refrigerant leaks NOTIC...

Page 10: ...iling mounted unit a 4 6 13 4 4 6 180 4 8 14 6 4 8 196 5 0 15 8 5 0 213 1 842 5 2 17 1 1 842 5 2 230 1 843 3 64 5 4 18 5 1 843 28 9 5 4 248 2 0 3 95 5 6 19 9 2 0 34 0 5 6 267 2 2 4 34 5 8 21 3 2 2 41 2 5 8 286 2 4 4 74 6 0 22 8 2 4 49 0 6 0 306 2 6 5 13 6 2 24 3 2 6 57 5 6 2 327 2 8 5 53 6 4 25 9 2 8 66 7 6 4 349 3 0 5 92 6 6 27 6 3 0 76 6 6 6 371 3 2 6 48 6 8 29 3 3 2 87 2 6 8 394 3 4 7 32 7 0 31...

Page 11: ...eficiency Toxic gas might be produced if refrigerant gas comes into contact with fire DANGER RISK OF EXPLOSION Pump down Refrigerant leakage If you want to pump down the system and there is a leak in the refrigerant circuit Do NOT use the unit s automatic pump down function with which you can collect all refrigerant from the system into the outdoor unit Possible consequence Self combustion and exp...

Page 12: ...d filling siphon attached Charge with the cylinder upright A siphon tube is NOT present Charge with the cylinder upside down Open refrigerant cylinders slowly Charge the refrigerant in liquid form Adding it in gas form may prevent normal operation CAUTION When the refrigerant charging procedure is done or when pausing close the valve of the refrigerant tank immediately If the valve is NOT closed i...

Page 13: ...ical shock or fire When installing the earth leakage protector make sure it is compatible with the inverter resistant to high frequency electric noise to avoid unnecessary opening of the earth leakage protector CAUTION When connecting the power supply connect the earth cable first before making the current carrying connections When disconnecting the power supply disconnect the current carrying cab...

Page 14: ...ch electrical component and terminal inside the electrical components box is connected securely Make sure all covers are closed before starting up the unit NOTICE ONLY applicable if the power supply is three phase and the compressor has an ON OFF starting method If there exists the possibility of reversed phase after a momentary black out and the power goes ON and OFF while the product is operatin...

Page 15: ...s the applicable standard Installation site see 6 1 Preparing the installation site 424 CAUTION Check if the installation location can support the unit s weight Poor installation is hazardous It can also cause vibrations or unusual operating noise Provide sufficient service space Do NOT install the unit so that it is in contact with a ceiling or a wall as this may cause vibrations WARNING The appl...

Page 16: ...piping and the outdoor unit when only carrying out piping work without connecting the indoor unit in order to add another indoor unit later WARNING Connect the refrigerant piping securely before running the compressor If the refrigerant piping is NOT connected and the stop valve is open when the compressor is run air will be sucked in This will cause abnormal pressure in the refrigeration cycle wh...

Page 17: ...Establish proper earthing Do NOT earth the unit to a utility pipe surge absorber or telephone earth Incomplete earthing may cause electrical shock Install the required fuses or circuit breakers Secure the electrical wiring with cable ties so that the cables do NOT come in contact with sharp edges or piping particularly on the high pressure side Do NOT use taped wires stranded conductor wires exten...

Page 18: ...T be less than 50 V DC before you can touch electrical components For the location of the terminals see the wiring diagram Finishing the outdoor unit installation see 10 Finishing the outdoor unit installation 454 DANGER RISK OF ELECTROCUTION Make sure that the system is earthed properly Turn OFF the power supply before servicing Install the switch box cover before turning ON the power supply Main...

Page 19: ...n on the switch box of the unit ALWAYS make sure that the unit is disconnected from the mains Turn off the respective circuit breaker When a safety device was activated stop the unit and find out why the safety device was activated before resetting it NEVER shunt safety devices or change their values to a value other than the factory default setting If you are unable to find the cause of the probl...

Page 20: ...reported immediately to the claims agent of the carrier Bring the packed unit as close as possible to its final installation position to prevent damage during transport When handling the unit take into account the following Fragile handle the unit with care Keep the unit upright in order to avoid damage Prepare the path along which you want to bring the unit inside in advance 4 2 Outdoor unit 4 2 ...

Page 21: ...n a flat surface Make sure the aluminium fins on the unit are straight before installation If not straighten them with a fin comb field supply 4 2 3 To remove the accessories from the outdoor unit 1 Lift the outdoor unit 2 Remove the accessories from the unit under service cover and from the bottom of the package j i a h 1 1 2 1 6 1 a 1 b c d e 3 1 1 i j g h f ...

Page 22: ...it installation manual b General safety precautions c Fluorinated greenhouse gases label d Multilingual fluorinated greenhouse gases label e Energy label f Screw bag The screws will be used for fixing the electrical wire anchor bands g Drain cap small h Drain cap large i Reducer assembly j Drain socket ...

Page 23: ...itioning indoor unit or the DHW tank see the combination table For details contact your dealer WARNING MILDLY FLAMMABLE MATERIAL The refrigerant inside this unit is mildly flammable INFORMATION For the operation limits see the latest technical data of the outdoor unit on the regional Daikin website publicly accessible 5 1 Identification 5 1 1 Identification label Outdoor unit Location ...

Page 24: ... carrying the unit in and out of the site Do NOT install the unit in places often used as work place In case of construction works e g grinding works where a lot of dust is created the unit MUST be covered CAUTION Check if the installation location can support the unit s weight Poor installation is hazardous It can also cause vibrations or unusual operating noise Provide sufficient service space D...

Page 25: ...neral safety precautions 47 7 1 3 Refrigerant piping length and height difference 434 Mind the following spacing guidelines 100 50 350 mm b a 100 50 b a 100 b a b a 350 350 50 b a a Air outlet b Air inlet Allow 300 mm of work space below the ceiling surface and 250 mm for piping and electrical servicing 250 300 mm NOTICE Do NOT stack the units on each other Do NOT hang the unit on a ceiling Strong...

Page 26: ...conditions the measured value might be higher than the sound pressure level mentioned in Sound spectrum in the data book due to environmental noise and sound reflections INFORMATION The sound pressure level is less than 70 dBA In places where a mineral oil mist spray or vapour may be present in the atmosphere Plastic parts may deteriorate and fall off or cause water leakage It is NOT recommended t...

Page 27: ...ilding c Outdoor unit d Windbreaker The outdoor unit is designed for outdoor installation only and for ambient temperatures within the following ranges unless otherwise specified in the operation manual of the connected indoor unit DX operation range Cooling mode Heating mode 10 46 C DB 15 24 C DB DHW operation range 15 42 C DB 6 1 2 Additional installation site requirements of the outdoor unit in...

Page 28: ...In heavy snowfall areas it is very important to select an installation site where the snow will NOT affect the unit If lateral snowfall is possible make sure that the heat exchanger coil is NOT affected by the snow If necessary install a snow cover or shed and a pedestal 6 2 Opening the unit 6 2 1 About opening the unit At certain times you have to open the unit Example When connecting the refrige...

Page 29: ...ng the installation site 424 6 3 2 Precautions when mounting the outdoor unit INFORMATION Also read the precautions and requirements in the following chapters 2 General safety precautions 47 6 1 Preparing the installation site 424 6 3 3 To provide the installation structure Check the strength and level of the installation ground so that the unit will not cause any operating vibration or noise Use ...

Page 30: ...base to make sure that there is proper drainage in order to avoid ice accumulation Prepare a water drainage channel around the foundation to drain waste water away from the unit Avoid drain water flowing over the footpath so that it does NOT become slippery in case of ambient freezing temperatures If you install the unit on a frame install a waterproof plate within 150 mm of the bottom side of the...

Page 31: ...ain socket 1 Install drain caps accessory f and accessory g Make sure the edges of the drain caps close off the holes completely 2 Install the drain socket a c b b b a a a Drain hole Install a drain cap large b Drain hole Install a drain cap small c Drain hole for drain socket 6 3 6 To prevent the outdoor unit from falling over In case the unit is installed in places where strong wind can tilt the...

Page 32: ...6 Unit installation Installer reference guide 32 4MWXM A R32 Split series 4P678385 1A 2022 02 ...

Page 33: ...3 1 About checking the refrigerant piping 41 7 3 2 Precautions when checking the refrigerant piping 42 7 3 3 To check for leaks 42 7 3 4 To perform vacuum drying 42 7 1 Preparing refrigerant piping 7 1 1 Refrigerant piping requirements INFORMATION Also read the precautions and requirements in the 2 General safety precautions 47 CAUTION Piping and joints of a split system shall be made with permane...

Page 34: ...ulation thickness Pipe outer diameter Øp Insulation inner diameter Øi Insulation thickness t 6 4 mm 1 4 8 10 mm 10 mm 9 5 mm 3 8 12 15 mm 13 mm 12 7 mm 1 2 14 16 mm 13 mm Øi Øi t Øp Øp If the temperature is higher than 30 C and the humidity is higher than RH 80 the thickness of the insulation materials should be at least 20 mm to prevent condensation on the surface of the insulation Use separate t...

Page 35: ...cting piping to indoor units shall be of non permanent type CAUTION Do NOT connect the embedded branch piping and the outdoor unit when only carrying out piping work without connecting the indoor unit in order to add another indoor unit later 7 2 1 About connecting the refrigerant piping Before connecting the refrigerant piping Make sure the outdoor and indoor unit are mounted Typical workflow Con...

Page 36: ... mineral oils and moisture from mixing into the system Install the piping so that the flare is NOT subjected to mechanical stress Do NOT leave pipes unattended at the site If the installation is NOT done within 1 day protect the piping as described in the following table to prevent dirt liquid or dust from entering the piping Use caution when passing copper tubes through walls see figure below Uni...

Page 37: ...when connecting the piping This to prevent nut cracking and leaks a b c d a Torque wrench b Spanner c Piping union d Flare nut Piping size mm Tightening torque N m Flare dimensions A mm Flare shape mm Ø6 4 15 17 8 7 9 1 R 0 4 0 8 2 45 90 2 ØA Ø9 5 33 39 12 8 13 2 Ø12 7 50 60 16 2 16 6 7 2 4 Pipe bending guidelines Use a pipe bender for bending All pipe bends should be as gentle as possible bending...

Page 38: ...a b c a Flare s inner surface MUST be flawless b The pipe end MUST be evenly flared in a perfect circle c Make sure the flare nut is fitted 7 2 6 Connections between outdoor and indoor unit using reducers Total indoor air conditioning units capacity class that can be connected to this outdoor unit 9 0 kW Port Dimensions Class Reducer A Liquid Ø6 4 mm Gas Ø9 5 mm 15 20 25 35 42 a B C Liquid Ø6 4 mm...

Page 39: ... nut or the smaller pipe may be damaged about 2 3 1 the normal torque 7 2 7 Using the stop valve and service port CAUTION Do NOT open the valves before flaring is complete This would cause refrigerant gas leakage To handle the stop valve Take the following guidelines into account The stop valves are factory closed The following figure shows the stop valve parts required when handling the valve c d...

Page 40: ...m and turn the valve stem Counterclockwise to open Clockwise to close 3 When the stop valve CANNOT be turned any further stop turning 4 Install the stop valve cover Result The valve is now open closed To handle the stem cap The stem cap is sealed where indicated with the arrow Do NOT damage it After handling the stop valve tighten the stem cap and check for refrigerant leaks Stem cap Width across ...

Page 41: ...erant piping between indoor and outdoor unit is installed in a ducting or the refrigerant piping is wrapped with finishing tape 7 3 Checking the refrigerant piping 7 3 1 About checking the refrigerant piping The outdoor unit s internal refrigerant piping has been factory tested for leaks You only have to check the outdoor unit s external refrigerant piping Before checking the refrigerant piping Ma...

Page 42: ...firmly closed before performing the leak test or vacuum drying 7 3 3 To check for leaks NOTICE Do NOT exceed the unit s maximum working pressure see PS High on the unit name plate NOTICE ALWAYS use a recommended bubble test solution from your wholesaler NEVER use soap water Soap water may cause cracking of components such as flare nuts or stop valve caps Soap water may contain salt which absorbs m...

Page 43: ...Increases There is moisture in the system Go to the next step 3 Vacuum the system for at least 2 hours to a manifold pressure of 0 1 MPa 1 bar 4 After turning the pump OFF check the pressure for at least 1 hour 5 If you do NOT reach the target vacuum or CANNOT maintain the vacuum for 1 hour do the following Check for leaks again Perform vacuum drying again NOTICE Make sure to open the stop valves ...

Page 44: ...arging additional refrigerant make sure the outdoor unit s external refrigerant piping is checked leak test vacuum drying INFORMATION Depending on the units and or the installation conditions it might be necessary to connect electrical wiring before you can charge refrigerant Typical workflow Charging additional refrigerant typically consists of the following stages 1 Determining if and how much y...

Page 45: ...y flammable WARNING The appliance shall be stored so as to prevent mechanical damage and in a well ventilated room without continuously operating ignition sources e g open flames an operating gas appliance or an operating electric heater The room size shall be as specified in the General safety precaution WARNING Do NOT pierce or burn refrigerant cycle parts Do NOT use cleaning materials or means ...

Page 46: ...mine the complete recharge amount INFORMATION If a complete recharge is necessary the total refrigerant charge is the factory refrigerant charge see unit name plate the determined additional amount 8 6 To charge additional refrigerant WARNING Only use R32 as refrigerant Other substances may cause explosions and accidents R32 contains fluorinated greenhouse gases Its global warming potential GWP va...

Page 47: ...he applicable language and stick it on top of a b Factory refrigerant charge see unit name plate c Additional refrigerant amount charged d Total refrigerant charge e Quantity of fluorinated greenhouse gases of the total refrigerant charge expressed as tonnes CO2 equivalent f GWP Global warming potential NOTICE Applicable legislation on fluorinated greenhouse gases requires that the refrigerant cha...

Page 48: ... complies with the electrical specifications of the heat pump 2 Connecting the electrical wiring to the outdoor unit 3 Connecting the electrical wiring to the indoor unit 4 Connecting the main power supply of the indoor unit 5 Connecting the main power supply of the gas boiler 6 Connecting the communication cable between the gas boiler and the indoor unit 7 Connecting the user interface 8 Connecti...

Page 49: ...em They can cause overheating electrical shock or fire Do NOT install a phase advancing capacitor because this unit is equipped with an inverter A phase advancing capacitor will reduce performance and may cause accidents WARNING Use an all pole disconnection type breaker with at least 3 mm between the contact point gaps that provide full disconnection under overvoltage category III WARNING If the ...

Page 50: ...20 S22 room A B C S23 TO TANK electronic expansion valve coil lead wire connector d MR30_A MR30_B suspend lead wire connectors e S40 thermal overload relay lead wire and high pressure switch connector f Multimeter DC voltage range g S90 S92 S93 thermistor lead wire connector h S50 suspend lead wire connector i S60 pressure sensor connector j S70 fan motor lead wire connector k S80 4 way valve lead...

Page 51: ...ing torques Item Tightening torque N m M4 X1M 1 2 M4 earth The earth wire between the wire retainer and the terminal must be longer than the other wires 1 3 9 1 3 Specifications of standard wiring components Component Power supply cable Voltage 220 240 V Phase 1 Frequency 50 Hz Wire type 3 core cable 2 5 mm2 H05RN F 60245 IEC 57 H07RN F 60245 IEC 66 3 core cable 4 0 mm2 H07RN F 60245 IEC 66 Interc...

Page 52: ...es a b a Strip wire end to this point b An excessive strip length may cause electrical shock or leakage 3 Connect the wires between the indoor and outdoor units so that the terminal numbers match Make sure to match the symbols for piping and wiring 4 Make sure to connect correct wiring to correct room d B d C d TO TANK A d A C TOTANK B a b c A Terminal for room A B Terminal for room B C Terminal f...

Page 53: ...ottom of the protection plate 9 Make sure that the electrical wiring does NOT make contact with the gas piping 2 1 2 3 a b d c e f 1 2 L N 3 a Terminal for indoor unit A b Terminal for indoor unit B c Terminal for indoor unit C d Terminal for DHW tank e Power supply terminal f Wire retainer 10 Reattach the switch box cover and the service cover ...

Page 54: ... cover before turning ON the power supply NOTICE It is recommended that the refrigerant piping between indoor and outdoor unit is installed in a ducting or the refrigerant piping is wrapped with finishing tape 1 Insulate and fix the refrigerant piping and cables as follows g b a f e c d a Gas pipe b Gas pipe insulation c Interconnection cable d Field wiring if applicable e Liquid pipe f Liquid pip...

Page 55: ...eat mode lock 57 11 1 About standby electricity saving function INFORMATION This function is available only for the air conditioning indoor units listed below The standby electricity saving function turns OFF the power supply to the outdoor unit and turns ON the standby electricity saving mode on the indoor unit The standby electricity saving function works with following units FTXM FTXJ FVXM FTXA...

Page 56: ...s set operates at high power the other indoor units will run with reduced capabilities Quiet operation priority If the indoor unit on which the priority room function is set to quiet operation the outdoor unit will also run quietly Ask the customer in which rooms he plans to use this function and make the necessary settings during installation Setting it in the guest rooms is convenient 11 2 1 To ...

Page 57: ...4 5 SW6 2 OFF ON 2 1 2 Set the night quiet mode switch SW6 1 to ON 11 4 About heat mode lock Heat mode lock limits the unit to heat operation 11 4 1 To turn ON heat mode lock 1 Remove the switch cover on the service PCB 2 Set the heat mode lock switch SW5 1 to ON 1 1 4 3 2 1 A 1 2 3 4 5 SW5 4 3 2 1 2 OFF ON ...

Page 58: ...ror check 60 12 5 2 To perform a test run 61 12 6 Starting up the outdoor unit 62 12 1 Overview Commissioning This chapter describes what you have to do and know to commission the system after it is installed Typical workflow Commissioning typically consists of the following stages 1 Checking the Checklist before commissioning 2 Performing a test run for the system 12 2 Precautions when commission...

Page 59: ...lled and the pipes are properly insulated The stop valves gas and liquid on the outdoor unit are fully open Drainage Make sure drainage flows smoothly Possible consequence Condensate water might drip The indoor unit receives the signals of the user interface The specified wires are used for the interconnection cable The fuses circuit breakers or locally installed protection devices are installed a...

Page 60: ... such as underground wiring This function CANNOT be used within 3 minutes after activating the safety breaker or when the outside air temperature is 5 C and if water temperature in DHW tank is 20 C To perform a wiring error check INFORMATION You only have to perform a wiring error check if you are not sure that the electrical wiring and piping is connected correctly 1 Remove the service PCB switch...

Page 61: ...requisite Power supply MUST be in the specified range Prerequisite Test run operation may be done in cooling or heating mode Prerequisite Test run should be done in accordance with the operation manual of the indoor unit to make sure that all functions and parts are working properly 1 In cooling mode select the lowest programmable temperature In heating mode select the highest programmable tempera...

Page 62: ... 02 INFORMATION Even if the unit is turned OFF it consumes electricity When the power turns back on after a power break the previously selected mode will be resumed 12 6 Starting up the outdoor unit See the indoor unit installation manual for configuration and commissioning of the system ...

Page 63: ...ser Make sure that the user has the printed documentation and ask him her to keep it for future reference Inform the user that he can find the complete documentation at the URL mentioned earlier in this manual Explain the user how to properly operate the system and what to do in case of problems Show the user what to do for the maintenance of the unit Explain the user about energy saving tips as d...

Page 64: ...ntenance at least once a year However applicable legislation might require shorter maintenance intervals NOTICE Applicable legislation on fluorinated greenhouse gases requires that the refrigerant charge of the unit is indicated both in weight and CO2 equivalent Formula to calculate the quantity in CO2 equivalent tonnes GWP value of the refrigerant total refrigerant charge in kg 1000 14 1 Overview...

Page 65: ...owing at least once a year Heat exchanger The heat exchanger of the outdoor unit can get blocked up due to dust dirt leaves etc It is recommended to clean the heat exchanger yearly A blocked heat exchanger can lead to too low pressure or too high pressure leading to worse performance 14 4 About the compressor When servicing the compressor keep in mind following precautions DANGER RISK OF ELECTROCU...

Page 66: ...f the respective circuit breaker When a safety device was activated stop the unit and find out why the safety device was activated before resetting it NEVER shunt safety devices or change their values to a value other than the factory default setting If you are unable to find the cause of the problem call your dealer DANGER RISK OF ELECTROCUTION WARNING Prevent hazards due to inadvertent resetting...

Page 67: ...3 4 Symptom Electrical leakage Possible causes Corrective action The unit is NOT earthed correctly Check and correct the connection of the earth wiring 15 3 5 Symptom Priority room setting does NOT function Possible causes Corrective action The priority room setting may be set for more than 1 room Only 1 room may be selected for the priority room setting A DHW tank for Multi CANNOT be selected as ...

Page 68: ...h temperature at inverter circuit heat sink Output over current b Refrigerant shortage b Low voltage to main circuit or over voltage to main circuit Reversing solenoid valve switching failure or high pressure switching failure b Faulty outdoor unit PCB Fan motor fault Wiring error Check wiring a The number of LEDs displayed depends on the number of rooms b Diagnosis may not apply to some cases For...

Page 69: ...15 Troubleshooting Installer reference guide 69 4MWXM A R32 Split series 4P678385 1A 2022 02 a Diagnosis may not apply to some cases For more details refer to the service manual ...

Page 70: ... automatic pump down function with which you can collect all refrigerant from the system into the outdoor unit Possible consequence Self combustion and explosion of the compressor because of air going into the operating compressor Use a separate recovery system so that the unit s compressor does NOT have to operate NOTICE During pump down operation stop the compressor before removing the refrigera...

Page 71: ... the power remove the service cover and the switch box cover and the service PCB switch cover 2 Set DIP switch SW5 and SW6 to OFF 3 Set DIP switch SW2 to COOL 2 1 1 1 OFF ON 4 3 2 1 2 1 4 3 2 1 HEAT COOL A 1 2 3 4 5 2 3 SW6 SW2 SW5 4 Reattach the service PCB switch cover 5 Turn ON the outdoor unit 6 Press the forced cooling operation switch SW1 to begin forced cooling 7 Press the forced cooling op...

Page 72: ... and numbering refer to the wiring diagram on the unit Part numbering is by Arabic numbers in ascending order for each part and is represented in the overview below by in the part code Symbol Meaning Symbol Meaning Circuit breaker Protective earth Connection Protective earth screw Connector A Rectifier Earth Relay connector Field wiring Short circuit connector Fuse Terminal INDOOR Indoor unit Term...

Page 73: ... Pilot lamp light emitting diode HAP Light emitting diode service monitor green HIGH VOLTAGE High voltage IES Intelligent eye sensor IPM Intelligent power module K R KCR KFR KHuR K M Magnetic relay L Live L Coil L R Reactor M Stepper motor M C Compressor motor M F Fan motor M P Drain pump motor M S Swing motor MR MRCW MRM MRN Magnetic relay N Neutral n N Number of passes through ferrite core PAM P...

Page 74: ...high S PL Pressure switch low S T Thermostat S RH Humidity sensor S W SW Operation switch SA F1S Surge arrester SR WLU Signal receiver SS Selector switch SHEET METAL Terminal strip fixed plate T R Transformer TC TRC Transmitter V R V Varistor V R Diode bridge Insulated gate bipolar transistor IGBT power module WRC Wireless remote controller X Terminal X M Terminal strip block Y E Electronic expans...

Page 75: ...istor gas b Outdoor air temperature thermistor l Muffler v Room A B C and Domestic hot water tank W c Heat exchanger thermistor m Discharge pipe thermistor w Field piping liquid d Refnet header n Compressor x Field piping gas e Fan motor o Accumulator y Twin branched muffler f Propeller fan p Gas stop valve z Pressure sensor g Capillary tube q Liquid stop valve h Distributor r Electronic expansion...

Page 76: ...ion explaining how to install configure and maintain it Operation manual Instruction manual specified for a certain product or application explaining how to operate it Maintenance instructions Instruction manual specified for a certain product or application which explains if relevant how to install configure operate and or maintain the product or application Accessories Labels manuals information...

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