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Vision Inverter Series

Service Manual 2016

Summary of Contents for MRVIT09AS

Page 1: ...Vision Inverter Series Service Manual 2016 ...

Page 2: ... 4 Installation for the first time 18 5 5 Adding the refrigerant after running the system for many years 19 5 6 Re installation while the indoor unit need to be repaired 20 5 7 Re installation while the outdoor unit need to be repaired 21 6 Disassemble Guide 23 7 Operation Characteristics 29 8 Electronic function 30 8 1 Abbreviation 30 8 2 Display function 30 8 3 Main Protection 32 8 4 Operation M...

Page 3: ...ry be especially careful of the case edges and the fins on the condenser and evaporator For installation always contact the dealer or an authorized service center Do not install the product on a defective installation stand Be sure the installation area does not deteriorate with age If the base collapses the air conditioner could fall with it causing property damage product failure and personal in...

Page 4: ... the drain hose to ensure that water is drained away properly A bad connection may cause water leakage Keep level even when installing the product It can avoid vibration of water leakage Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods It may cause a problem for your neighbors Use two or more people to lift and transport the product Do not ...

Page 5: ...e remote control with new ones of the same type Do not mix old and new batteries or different types of batteries There is risk of fire or explosion Do not recharge or disassemble the batteries Do not dispose of batteries in a fire They may burn of explode If the liquid from the batteries gets onto your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked...

Page 6: ...odel Names of Indoor Outdoor Units Inverter Capacity Indoor units Outdoor units 9k MWVIT09SA MRVIT09ASA 9k MWVIT09S MRVIT09AS 12k MWVIT12SA MRVIT12ASA 12k MWVIT12S MRVIT12AS 18K MWVIT18S MRVIT18AS 24K MWVIT24S MRVIT24AS ...

Page 7: ...7 3 Dimension 3 1 Indoor Unit Model W D1 D2 H MWVIT09SA 897 182 158 312 MWVIT09S 897 182 158 312 MWVIT12SA 897 182 158 312 MWVIT12S 897 182 158 312 MWVIT18S 1004 205 178 350 MWVIT24S 1130 218 195 368 ...

Page 8: ...8 For MWVIT09SA MWVIT09S MWVIT12SA MWVIT12S ...

Page 9: ...9 For MWVIT18S For MWVIT24S ...

Page 10: ...10 3 2 Outdoor Unit ...

Page 11: ...11 For MRVIT09ASA MRVIT09AS MRVIT12ASA MRVIT12AS 487 W1 70 W2 298 555 300 D H 12 60 93 H1 H2 D1 770 W 779 W3 322 D2 25 B1 90 B2 61 5 A2 12 A1 R 6 286 D3 ...

Page 12: ...12 For MRVIT18AS 800 W 514 W1 554 60 85 5 340 12 0 311 815 W3 365 333 D 70 W2 H H1 H2 D1 D2 D3 62 B1 106 B2 20 A1 R20 R6 61 6 A2 ...

Page 13: ...13 For MRVIT24AS ...

Page 14: ...Refrigerant Cycle Diagram For cooling only models INDOOR OUTDOOR LIQUID SIDE GAS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER COMPRESSOR CAPILIARY TUBE T2 Evaporator temp sensor T1 Room temp sensor ...

Page 15: ...AS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER COMPRESSOR 2 WAY VALVE 3 WAY VALVE 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor T1 Room temp sensor ACCUMULATOR INDOOR OUTDOOR CHECK VALVE Heating Model only CAPILIARY TUBE ...

Page 16: ...19 3 4 6500 663kgf cm 6700 683kgf cm 5 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Rated current of appliance Nominal cross sectional area mm 3 and 6 0 75 6 and 10 1 10 and 16 1 5 16 and 25 2 5 The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located o...

Page 17: ... Ф9 52 1 4 Ф6 35 5 10 25 15 MWVIT09S MRVIT09AS 3 8 Ф9 52 1 4 Ф6 35 5 10 25 15 MWVIT12SA MRVIT12ASA 1 2 Ф12 7 1 4 Ф6 35 5 10 25 15 MWVIT12S MRVIT12AS 1 2 Ф12 7 1 4 Ф6 35 5 10 25 15 MWVIT18S MRVIT18AS 1 2 Ф12 7 1 4 Ф6 35 5 20 30 15 MWVIT24S MRVIT24AS 5 8 Ф15 9 3 8 Ф9 52 5 20 30 30 Caution The capacity test is based on the standard length and the maximum permissive length is based on the system relia...

Page 18: ...the charge hose of handle hi connection to the vacuum pump 4 Fully open the handle Lo of the manifold valve 5 Operate the vacuum pump to evacuate 6 Make evacuation for 30 minutes and check whether the compound meter indicates 0 1Mpa If the meter does not indicate 0 1Mpa after pumping 30 minutes it should be pumped 20 minutes more If the pressure can t achieve 0 1Mpa after pumping 50 minutes please...

Page 19: ...he valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure the liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air con...

Page 20: ...3 Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly 4 Set the 2 way valve to the close position 5 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1MPa 6 Set the 3 way valve to the closed position immediately Do this quickly so that the gauge ends up...

Page 21: ...harge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to pur...

Page 22: ...22 cap to a torque of 18N m Be sure to check for gas leakage ...

Page 23: ...mble guide take 24K indoor units as an example 6 1 How to Remove the filter STEP1 Press the button on the both side of the indoor unit STEP2 Open the panel and because of two snap fit open it vigorously STEP3 Pull the filter then job is done ...

Page 24: ...P2 Bend the horizontal louver lightly and pull it from the indoor unit 6 3 How to Remove the panel assembly STEP1 Press the button on the both side of the indoor unit STEP2 Because of two snap fit open the panel vigorously without any Worries STEP3 Loosen the display board connector Pull the panel with both side plates ...

Page 25: ...ands and pull it upwards along the direction indicated in right image vigorously so that the snap fit inside can be disassembled this is the key step for removing the frame STEP3 Grab the frame red side and disassemble the snap fit inside STEP4 Separate the frame part and the base plate part STEP5 Remove the 3 Screws and then remove the cover1 and cover2 STEP6 Open the cover and the PCB can be see...

Page 26: ... base plate part STEP2 Remove the Screw on the cover of the electrical control box STEP3 Disconnect the wires of the motor and the V shape light then pull out the coil temp and loose the earth wire STEP4 Press the snap fit with the screw driver and then remove the electrical control box ...

Page 27: ...sis is hold by the installation plate and two snap fit designs Grab the indoor unit and pull it away from the installation plate STEP3 Grab both corner of the basis chassis like picture shown and then pull it away from the upper chassis with a few resistance because of two snap fit designs STEP4 After that the chassis is disassembled ...

Page 28: ...28 6 7 How to Remove the Evaporator assembly STEP1 After removing the Chassis assembly Removing the screw and unfolding the pipe clamp board shown in the picture and the evaporator can be taken ...

Page 29: ...ditioner is used beyond the above conditions certain safety protection features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 80 If the air conditioner operates beyond this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to the floor and set...

Page 30: ...hen Timer ON Fresh Swing Turbo or Silence feature is activated Dispalys for three seconds when Timer OFF is set Dispalys for three seconds when Fresh Swing Turbo or Silence feature is cancelled Dispalys under deforsting operation Dispalys when anti cold air feature is activated under heating mode Dispalys during self clean operation if aplicable Dispalys when freeze protection is turned on if apli...

Page 31: ...on mode In AUTO COOL and DRY mode the light is blue In AUTO HEAT mode the light is orange The light is off in Fan mode When room light is turned off the display window will slowly darken after 5 seconds and the buzzer turned off It will be back to normal after the light is turned on ...

Page 32: ... indoor fan will open 7s later If the unit runs in heating mode the indoor fan will be also controlled by anti cold wind function 8 3 7 Compressor preheating functions Preheating permitting condition When T4 outdoor ambient temperature 3 C the preheating function will be activated 8 3 8 Sensor protection at open circuit and breaking disconnection When there s only one temperature sensor in malfunc...

Page 33: ...he current protection function will be activated and the compressor will stop 8 4 2 2 Outdoor fan running rules The outdoor unit will be run at different fan speed according to T4 For different outdoor units the fan speeds are different For MRVIT09AS MRVIT18AS models High Low For MRVIT09ASA MRVIT12ASA MRVIT12AS MRVIT24AS models T4 A A B C D E 8 4 2 3Indoor fan running rules In cooling mode indoor ...

Page 34: ...function will be activated and the compressor will stop 8 4 3 2 Outdoor fan running rules The outdoor unit will be run at different fan speed according to T4 For different outdoor units the fan speeds are different For MRVIT09AS MRVIT18AS models Low High For MRVIT09ASA MRVIT12ASA MRVIT12AS MRVIT24AS models T4 E D C B A A 8 4 3 3 Indoor fan running rules When the compressor is on the indoor fan can...

Page 35: ...80 seconds The machine has run for 15 minutes in defrosting mode 8 4 3 5 Evaporator coil temperature protection Resume Off Decrease Hold When evaporator temperature temp is more than the setting protection value the compressor will stop 8 4 4 Auto mode This mode can be chosen with remote controller and the setting temperature can be changed between 17 C 30 C In auto mode the machine will choose co...

Page 36: ... through an auto restart module In case of a sudden power failure the module memorizes the setting conditions before the power failure The unit will resume the previous operation setting not including swing function automatically after 3 minutes when power returns If the memorization condition is forced cooling mode the unit will run in cooling mode for 30 minutes and turn to auto mode as 24 setti...

Page 37: ...llow me signal and the temperature collection function of room temperature sensor will be shielded but the error detective function of room temperature sensor will be still valid 2 When the follow me function is available the PCB will control the unit according to the room temperature from the remote controller and the setting temperature 3 The PCB will take action to the mode change information f...

Page 38: ...iry information Displaying code Meaning T1 T1 T1 temp T2 T2 T2 temp T3 T3 T3 temp T4 T4 T4 temp T2B Tb T2B temp TP TP TP temp TH TH TH temp Targeted Frequency FT Targeted Frequency Actual Frequency Fr Actual Frequency Indoor fan speed IF Indoor fan speed Outdoor fan speed OF Outdoor fan speed EXV opening angle LA EXV opening angle Compressor continuous running time CT Compressor continuous running...

Page 39: ... 131 139 E0 E1 E9 140 141 149 F0 F1 F9 150 151 159 Indoor fan speed Outdoor fan speed 0 OFF 1 2 3 4 Low speed Medium speed High speed Turbo For some big capacity motors 14 FF Actual fan speed Display value turns to decimal value and then multiply 10 The unit is RPM For some small capacity motors display value is from 14 FF hexadecimal the corresponding fan speed range is from 200 2550RPM EXV openi...

Page 40: ... electricity power in capacitor Electrolytic Capacitors HIGH VOLTAGE CAUTION For other models please connect discharge resistance approx 100Ω 40W or soldering iron plug between terminals of the electrolytic capacitor on the contrary side of the outdoor PCB Note The picture above is only for reference The plug of your side may be different ...

Page 41: ...t leakage detection 1 times O F0 Overload current protection 2 times O F1 Outdoor ambient temperature sensor T4 open circuit or short circuit 3 times O F2 Condenser coil temperature sensor T3 open circuit or short circuit 4 times O F3 Compressor discharge temperature sensor T5 open circuit or short circuit 5 times O F4 Outdoor unit EEPROM parameter error 6 times O F5 Outdoor fan speed has been out...

Page 42: ...PCB directly Otherwise check whether the EEPROM chip plugged in main PCB well Yes No Yes Correct the connection Replace the indoor outdoor main PCB Shut off the power supply and turn it on 2 minutes later Is it still displaying the error code EEPROM a read only memory whose contents can be erased and reprogrammed using a pulsed voltage For the location of EEPROM chip please refer to the below phot...

Page 43: ...tinguished Power off then restart the unit 2 minutes later Is the error extinguished No Replace the outdoor main PCB Power on Is the error extinguished Replace the outdoor main PCB Power on Is the error extinguished Check the outdoor wiring connection Is the wiring correctly Check the outdoor wiring connection Is the wiring correctly Replace the indoor main PCB Power on Is the error extinguished R...

Page 44: ...ark Use a multi meter to test the resistance of the reactor which does not connect with capacitor The normal value should be around zero ohm Otherwise the reactor must have malfunction and need to be replaced ...

Page 45: ...ns The zero crossing signal time interval is not correct for continuous 240s Supposed causes Indoor PCB faulty Troubleshooting Check if the connections and power supply is normal Correct the connections Turn on the unit when the power supply is good No Yes Indoor main PCB is defective Replace indoor main PCB ...

Page 46: ... off the power supply and turn it on 2 minutes later Is it still displaying the error code Shut off the power supply rotate the fan by hand Does it rotate properly The unit operates normally Find out the cause and have it solved For example check whether the fan is blocked or the bearing is broken Check the wires of fan motor Are all the connections good No Yes No Correct the connections No Check ...

Page 47: ...14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V DC motor voltage input and output voltage 115V NO Color Signal Voltage 1 Red Vs Vm 140V 190V 2 3 Black GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V 2 Outdoor DC Fan Motor control chip is in outdoor PCB Power on and check if the fan can run normally if the fan can run normally the PCB must has problems and need to be replaced If ...

Page 48: ...it running in fan mode at high fan speed After running for 15 seconds measure the voltage of pin1 and pin2 If the value of the voltage is less than 100V 208 240V power supply or 50V 115V power supply the PCB must has problems and need to be replaced ...

Page 49: ...urn off Supposed causes T2 sensor faulty Indoor PCB faulty System problems such as leakage or blocking Trouble shooting Is there cool air blowing out from indoor air outlet Yes Yes Check if T2 sensor is well fixed Correct the installation or replace T2 sensor Does the problem remain again No Is there any leakage Especially the connection parts such as the gas valve and the liquid valve No Shut off...

Page 50: ... is lower than 0 06V or higher than 4 94V the LED will display the failure Supposed causes Wiring mistake Sensor faulty Trouble shooting Check the connections between temperature sensor and main PCB Are the connections good Correct the connections No Yes Yes Replace indoor or outdoor main PCB Replace the sensor Check the resistance value of the sensor is it normal No ...

Page 51: ...lty Wiring mistake Compressor malfunction Trouble shooting Check the power supply Is it normal Check the connections and wires Is it well connection Stop the unit Check the power supply No Yes No Correct the connections or replace the wires Yes Replace the outdoor main PCB Yes Check the reactor Is it normal No Replace the reactor Is there any blocking No Yes Clear the blockage Check the compressor...

Page 52: ...in PCB and compressor If the wires and connectors are broken Correct the connection or replace the wires and connectors Yes No IPM continuity check Check if the IPM terminal resistance values are uniform Replace the IPM board or replace the main PCB if the IPM board and main PCB are integrated together No Check if the outdoor fan runs properly or the outdoor unit ventilation is good Yes No Please ...

Page 53: ...ytic capacitors discharge completely and dismount the IPM Use a digital tester to measure the resistance between P and UVWN UVW and N Digital tester Normal resistance value Digital tester Normal resistance value Red Black Several MΩ Red Black Several MΩ P N U N U V V W W Red ...

Page 54: ...kage or block PCB faulty Trouble shooting Check the power supply Check the connections and wires Stop the unit No Yes No Correct the connections or replace the wires Yes Replace the reactor No No Replace the IPM board Power on and when the unit is in standby check if the voltage between P and N is around DC 310V or 340V or 380V Then start up the unit measure the voltage between P and N Is it in 22...

Page 55: ... CompTop port on the PCB connects with a sensor Check if the CompTop port on the PCB connects with a sensor Yes Correct the connection Correct the connection Check refrigerant system Check refrigerant system Please refer to the solution of High temperature protection of compressor top malfunction Please refer to the solution of High temperature protection of compressor top malfunction No Check if ...

Page 56: ...0 minutes later Check if the temperature of compressor Is normal No Check if the refrigerant system is normal Repair the refrigerant system Replace the outdoor control PCB Yes Check if all the connection especially the connection of OLP Over Load Protector sensor is good Correct the connection No Measure the resistance between the two ports of the OLP Is it zero Yes Replace the OLP No Replace the ...

Page 57: ...connected well Correct the connection or replace the wires and connectors No Yes Check if the IPM installed correctly Correct the installation tighten the screws and apply silicon grease No IPM continuity check Check if the IPM terminal resistance values are uniform Yes Replace the IPM board or replace the main PCB if the IPM board and main PCB are integrated together No Check if the outdoor fan r...

Page 58: ... from PCB measure the resistance value with a tester Temperature Sensors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient temp T4 sensor Compressor discharge temp T5 sensor Measure the resistance value of each winding by using the multi meter ...

Page 59: ... 29078 117 243 0 38991 2 28 39 8239 38 100 5 62961 78 172 1 25423 118 244 0 37956 1 30 37 1988 39 102 5 39689 79 174 1 2133 119 246 0 36954 0 32 35 2024 40 104 5 17519 80 176 1 17393 120 248 0 35982 1 34 33 3269 41 106 4 96392 81 178 1 13604 121 250 0 35042 2 36 31 5635 42 108 4 76253 82 180 1 09958 122 252 0 3413 3 37 29 9058 43 109 4 5705 83 181 1 06448 123 253 0 33246 4 39 28 3459 44 111 4 3873...

Page 60: ... 2 422 4 25 222 8 36 97 34 32 76 169 7 82 116 241 2 357 3 27 211 4 37 99 32 94 77 171 7 566 117 243 2 294 2 28 200 7 38 100 31 62 78 172 7 321 118 244 2 233 1 30 190 5 39 102 30 36 79 174 7 086 119 246 2 174 0 32 180 9 40 104 29 15 80 176 6 859 120 248 2 117 1 34 171 9 41 106 28 81 178 6 641 121 250 2 061 2 36 163 3 42 108 26 9 82 180 6 43 122 252 2 007 3 37 155 2 43 109 25 86 83 181 6 228 123 253...

Page 61: ...pressor checking Measure the resistance value of each winding by using the tester Position Resistance Value ASN98D22UFZ ASM135D23UFZ ATF235D22UMT Blue Red 1 57Ω 20 68 1 75Ω 20 68 0 75Ω 20 68 Blue Black Red Blue ...

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