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AlpicAir DC Inverter Multi VRF System Owner's Manual

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Thank you for choosing Air Conditioners, please read this owner's manual carefully before
operation and retain it for future reference.
D.C. Inverter
Multi VRF Modular
Owner's Manual
Air Conditioners
AOU-224VRDC3A
AOU-280VRDC3A
AOU-335VRDC3A
AOU-400VRDC3A
AOU-450VRDC3A
AOU-504VRDC3A
AOU-2460VRDC3A

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  • Page 1 D.C. Inverter Multi VRF Modular Owner's Manual Air Conditioners AOU-224VRDC3A AOU-280VRDC3A AOU-335VRDC3A AOU-400VRDC3A AOU-450VRDC3A AOU-504VRDC3A AOU-2460VRDC3A Thank you for choosing Air Conditioners, please read this owner’s manual carefully before operation and retain it for future reference.
  • Page 2 Preface ALPICAIR DC Inverter Multi VRF System, with the most advanced technologies in the world, uses eco- friendly refrigerant R410A as its cooling medium. For correct installation and operation, please read this manual carefully. Before reading the manual, please note that: (1) For safety operation, please strictly follow the instructions in this manual.

  • Page 3: Table Of Contents

    Contents 1 Safety Notices (Please be sure to abide ) ..................1 2 Product Introduction ..........................3 2.1 Names of Main Parts ........................4 2.2 Combinations of Outdoor Units ....................4 2.3 Combinations of Indoor and Outdoor Units ................5 2.4 The Range of Production Working Temperature ...............

  • Page 4: Safety Notices (Please Be Sure To Abide )

    DC Inverter VRF 1 Safety Notices (Please be sure to abide ) Warning: If not abide strictly, it may cause severe damage to the unit or the people. Note: If not abide strictly, it may cause slight or medium damage to the unit or the people.
  • Page 5 DC Inverter VRF Never fail to comply with the Never short-circiut or cancel nitrigen charge the pressure switch to prevent requirements.Charge nitrogen unit damage. when welding pipes. Before using the unit, please Please firstly connect the wired check if the piping and wiring controller before energization, are correct to avoid water otherwise wired controller can...

  • Page 6: Product Introduction

    ALPICAIR will not assume responsibility of personal injury or equipment damage caused by improper installation and commission, unnecessary service and incapable of following the rules and instructions listed in this manual.

  • Page 7: Names Of Main Parts

    DC Inverter VRF 2.1 Names of Main Parts Fig. 2.1.1 ① ② ③ ④ ⑤ Electric Box Power cord Communication Name Fan, Motor Valve interface Assembly through-hole code through-hole Note: The picture is only used for reference and the actual product prevails. 2.2 Combinations of Outdoor Units Model(Single) AOU-680VRDC3A...

  • Page 8: Combinations Of Indoor And Outdoor Units

    DC Inverter VRF Model(Single) AOU-1800VRDC3A AOU-1845VRDC3A AOU-1908VRDC3A AOU-1962VRDC3A AOU-280VRDC3A AOU-280VRDC3A AOU-560VRDC3A AOU-615VRDC3A +AOU-450VRDC3A +AOU-504VRDC3A Model(Combined) +AOU-615VRDC3A + AOU-615VRDC3A +AOU-560VRDC3A +AOU-560VRDC3A +AOU-615VRDC3A + AOU-615VRDC3A +AOU-615VRDC3A +AOU-615VRDC3A Model(Single) AOU-2016VRDC3A AOU-2072VRDC3A AOU-2028VRDC3A AOU-2184VRDC3A AOU-280VRDC3A AOU-280VRDC3A AOU-280VRDC3A AOU-335VRDC3A +AOU-560VRDC3A +AOU-560VRDC3A +AOU-615VRDC3A +AOU-615VRDC3A Model(Combined) +AOU-560VRDC3A +AOU-615VRDC3A +AOU-615VRDC3A +AOU-615VRDC3A...
  • Page 9 The total capacity of indoor units should be within 50%~135% of that of outdoor units. Fig. 2.3.1 Fig. 2.3.1 is the combination view of the ODU of Modular DC Inverter Multi VRF System and the IDU of Multi VRF System. IDU can be cassette type, one-way cassette type, wall-mounted type, duct type, etc.

  • Page 10: The Range Of Production Working Temperature

    3 Preparation before Installation Note: The picture is only used for reference and the actual product prevails. Unit: mm. 3.1 Standard Parts Please use the following standard parts supplied by ALPICAIR. Parts for Outdoor Unit Number Name Picture...
  • Page 11 DC Inverter VRF Install the unit at a place where Never expose the unit under is adequate to withstand the direct sunshine and weight of the unit and make sure rainfall.Install the unit at a the unit would not shake or fall place where is against dust, off.
  • Page 12 DC Inverter VRF 3.2.1.2 Space dimension for dual-module unit Fig. 3.2.2 3.2.1.3 Space dimension for three-module unit Fig. 3.2.3...
  • Page 13 DC Inverter VRF 3.2.1.4 Space dimension for four-module unit Fig. 3.2.4 3.2.2 When there is wall (or similar obstruction) above the unit, keep the distance between the unit top and the wall at least 3000mm or above. When the unit is located in a totally open space with no obstructions in four directions, keep the distance between the unit top and wall at least 1500mm or above (See Fig.
  • Page 14 DC Inverter VRF 3.2.3 Space dimension for multiple-module unit For keeping good ventilation, make sure there is no obstructions above the unit. When the unit is located at a half-open space (front and left/right side is open), install the unit as per the same or opposite direction.
  • Page 15 DC Inverter VRF 3.2.4 Take seasonal wind into consideration when installing the outdoor unit （1）Anti-monsoon installation requirements for unit not connecting exhaust duct: Fig. 3.2.9...

  • Page 16: Piping Work Requirements

    DC Inverter VRF （2）Anti-monsoon installation requirements for unit connecting exhaust duct: Fig. 3.2.10 3.2.5 Take snow into consideration when installing the outdoor unit Fig. 3.2.11 3.3 Piping Work Requirements Refer to the table below for piping work requirements. R410A Refrigerant System Outer Diameter (mm) Wall Thickness (mm) Type...

  • Page 17: Installation Instruction

    DC Inverter VRF 4 Installation Instruction 4.1 Physical Dimension of the Outdoor Unit and Mounting Hole Outline and Physical Dimention of AOU-224VRDC3A and AOU-280VRDC3A unit Unit: mm Fig. 4.1.1...
  • Page 18 DC Inverter VRF Outline and Physical Dimention of AOU-335VRDC3A, AOU-400VRDC3A and AOU-450VRDC3A unit Unit: mm Fig. 4.1.2 Outline and Physical Dimention of AOU-504VRDC3A, AOU-560VRDC3A and AOU-615VRDC3A unit Unit: mm Fig. 4.1.3...

  • Page 19: Connection Pipe

    DC Inverter VRF 4.2 Connection Pipe 4.2.1 Schematic Diagram of Piping Connection Fig. 4.2.1 4.2.2 Schematic Diagram of Piping Sequence AOU-224VRDC3A and AOU-280VRDC3A Fig. 4.2.2...
  • Page 20 DC Inverter VRF AOU-335VRDC3A, AOU-400VRDC3A and AOU-450VRDC3A Fig. 4.2.3 AOU-504VRDC3A, AOU-560VRDC3A and AOU-615VRDC3A Fig. 4.2.4...
  • Page 21 DC Inverter VRF 4.2.3 Allowable pipe length and drop height among indoor and outdoor units Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is shown in the figure below. Remark: Equivalent length of one Y-type manifold is about 0.5m. Fig.
  • Page 22 DC Inverter VRF Equivalent length of branch of IDU is 0.5m Allowable R410A Refrigerant System Fitting Pipe Value Total length (actual length) of fitting pipe ≤1000 L1+L2+L3+L4+…+L9+a+b+…+i+j Actual length ≤165 Length of farthest fitting L1+L6+L7+L8+L9+j pipe(m) Equivalent length ≤190 Difference between the pipe length from the first branch of IDU to the farthest IDU and the pipe length from the L10-L11 ≤40...
  • Page 23 DC Inverter VRF Outdoor Model Gas pipe size(mm) Liquid pipe size(mm) AOU-960VRDC3A Φ38.1 Φ22.2 AOU-1010VRDC3A Φ41.3 Φ22.2 AOU-1065VRDC3A Φ41.3 Φ22.2 AOU-1130VRDC3A Φ41.3 Φ22.2 AOU-1180VRDC3A Φ41.3 Φ22.2 AOU-1235VRDC3A Φ41.3 Φ22.2 AOU-1300VRDC3A Φ41.3 Φ22.2 AOU-1350VRDC3A Φ41.3 Φ22.2 AOU-1410VRDC3A Φ22.2 Φ44.5 AOU-1460VRDC3A Φ22.2 Φ44.5 AOU-1515VRDC3A Φ22.2...
  • Page 24 DC Inverter VRF 4.2.4 Connection Pipe among Outdoor Modules Fig. 4.2.6 Fig. 4.2.7 Note: When the distance between outdoor units exceeds 2m, U-type oil trap should be added at low-pressure gas pipe. A+B 10m. ≤ 4.2.5 Fitting pipe between Outdoor Unit and the First Manifold 4.2.5.1 For single module system, pipe size (between outdoor unit and the first manifold) is determined by that of outdoor unit.
  • Page 25 DC Inverter VRF Pipe size of basic outdoor module is shown as follows: Pipe between ODU and the first branch of IDU Basic Module Gas Pipe(mm) Liquid Pipe(mm) AOU-224VRDC3A Φ19.05 Φ9.52 AOU-280VRDC3A Φ22.2 Φ9.52 AOU-335VRDC3A Φ25.4 Φ12.7 AOU-400VRDC3A Φ25.4 Φ12.7 AOU-450VRDC3A Φ28.6 Φ12.7...
  • Page 26 DC Inverter VRF 4.2.5.3 Fitting pipe between two manifolds from basic modules Pipe size (between two manifolds from basic modules) is based on the total capacity of upstream modules. Fig. 4.2.10 Pipe size between manifolds Total capacity of upstream modules Q(kW) Gas Pipe(mm) Liquid Pipe(mm)
  • Page 27 DC Inverter VRF Pipe between ODU and the first branch of IDU Basic Module(single module) Gas Pipe(mm) Liquid Pipe(mm) AOU-224VRDC3A Φ19.05 Φ9.52 AOU280VRDC3A Φ22.2 Φ9.52 AOU-335VRDC3A Φ25.4 Φ12.7 AOU-400VRDC3A Φ25.4 Φ12.7 AOU-450VRDC3A Φ28.6 Φ12.7 AOU-504VRDC3A Φ28.6 Φ15.9 AOU-560VRDC3A Φ28.6 Φ15.9 AOU-615VRDC3A Φ28.6 Φ15.9...
  • Page 28 DC Inverter VRF Pipe between ODU and the first branch of IDU Total rated capacity of outdoor modules (multi-modular system) Gas Pipe(mm) Liquid Pipe(mm) AOU-1350VRDC3A Ф38.1 Ф19.05 AOU-1410VRDC3A Ф41.3 Ф19.05 AOU-1460VRDC3A Ф41.3 Ф19.05 AOU-1515VRDC3A Ф41.3 Ф19.05 AOU-1580VRDC3A Ф41.3 Ф19.05 AOU-1630VRDC3A Ф41.3 Ф19.05 AOU-1685VRDC3A...
  • Page 29 DC Inverter VRF Fig. 4.2.13(b) Total capacity of downstream R410A Refrigerant System Model indoor unit(s) C (kW) C＜20.0 FQ01A/A 20.0≤C≤30.0 FQ01B/A 30.0＜C≤70.0 Y-type Manifold FQ02/A 70.0＜C≤135.0 FQ03/A 135.0＜C FQ04/A C≤40.0 FQ014/H1 T- type Manifold 40.0＜C≤68.0 FQ018/H1 68.0＜C FQ018/H2 4.2.5.6 Fitting pipe between manifolds Pipe size (between two manifolds at indoor unit side) is based on the total capacity of upstream indoor unit(s).

  • Page 30: Installation Of The Connection Pipe

    DC Inverter VRF Dimension of the pipe of indoor branch Total capacity of downstream indoor unit(s) C(kW) Gas Pipe(mm) Liquid Pipe (mm) C≤5.0 Φ12.7 Φ6.35 5.0＜C≤14.2 Φ15.9 Φ9.52 14.2＜C≤22.4 Φ19.05 Φ9.52 22.4＜C≤28.0 Φ22.2 Φ9.52 28.0＜C≤40.0 Φ25.4 Φ12.7 40.0＜C≤45.0 Φ28.6 Φ12.7 45.0＜C≤68.0 Φ28.6 Φ15.9...
  • Page 31 DC Inverter VRF should be as large as possible. (2) Weld the connection pipes between indoor and outdoor unit. Please strictly conform to the requirements for welding process. Rosin joints and pin holes are not allowable. (3) When laying the pipes, be careful not to deform them. The radius of bending parts should be more than 200mm.
  • Page 32 DC Inverter VRF Fig. 4.3.2(b) (2) Manifold has serveral pipe sections with different pipe size, which facilitates to match with various copper pipe. Use pipe cutter to cut in the middle of the pipe section with different pipe size and deburr as well. See Fig. 4.3.3. Fig.
  • Page 33 DC Inverter VRF (4) Manifold is isolated by insulating material that can bear 120℃ or higher temperature. Manifold attached foam can not be taken as insulating material. 4.3.3 Installation and thermal insulation for pipeline (1) For multi VRF system, every copper pipe should be labeled so as to avoid misconnection. (2) Manifolds can be laid in the following ways: The length of a straight pipe between two manifolds cannot be less than 500 mm.
  • Page 34 DC Inverter VRF Fig. 4.3.7 (5) Thermal insulation for pipeline 1) To avoid condensate or water leakage on connecting pipe, the gas pipe and liquid pipe must be wrapped with thermal insulating material and adhesive pipe for insulation from the air. 2) For heat pump unit, liquid pipe should bear 70℃...

  • Page 35: Air Purging And Refrigerant Charge

    DC Inverter VRF 4) Manifold attached foam can not be taken as insulating material. 5) When wrapping the tape, the later circle should cover half of the former one. Don’t wrap the tape so tightly, otherwise the insulation effect will be weakened. 6) After wrapping the pipe, adopt sealing material to completely fill the hole so as to prevent wind and rain from entering the room.
  • Page 36 DC Inverter VRF Diameter of liquid Φ28.6 Φ25.4 Φ22.2 Φ19.05 Φ15.9 Φ12.7 Φ9.52 Φ6.35 pipe (mm) kg/m 0.680 0.520 0.350 0.250 0.170 0.110 0.054 0.022 (2) ∑Refrigerant charging amount B of every module Refrigerant charging amount B of every Module capacity(kW) module(kg)②...
  • Page 37 DC Inverter VRF After confirming that there is no leakage from the system, when the compressor is not in operation, charge additional R410A with specified amount to the unit through the filling opening of the liquid pipe valve of the outdoor unit. If required additional refrigerant can not be quickly filled for increase of pressure in the pipe, set the unit at cooling startup and then fill the refrigerant from gas valve of outdoor unit.

  • Page 38: Electric Wiring

    DC Inverter VRF 4.5 Electric Wiring 4.5.1 Wiring precautions  Wiring should conform to national rules. All the parts, materials, electric work should be in accordance with local codes.  Rated voltage and exclusive power supply should be used.  Power cord should be fixed soundly and reliable. Never forcibly pull the power cord. ...
  • Page 39 DC Inverter VRF Circuit Circuit breaker break Wire size of capacity for Wire size of combined uni Model Basic models power supply combined units capac ity (A) AOU-680VRDC3A 280+400 25 + 40 2.5 + 6.0 2.5×5 + 6.0×5 2.5×5 + 6.0×5 AOU-730VRDC3A 280+450 25 + 40...
  • Page 40 DC Inverter VRF ④ Copper-core cable must be used. ⑤ The above sectional area is suitable for a maximum distance of 15m. If it’s over 15m, sectional area must be expanded to prevent overload current from burning the wire or causing fire hazard.
  • Page 41 DC Inverter VRF Fig. 4.5.2...

  • Page 42: System Communication

    DC Inverter VRF Wiring method for the power cord of AOU-504VRDC3A, AOU-560VRDC3A and AOU-615VRDC3A Fig. 4.5.3 4.6 System Communication 4.6.1 Communication system include: (1) Communication among outdoor basic modules; (2) Communication between ODU and IDU; (3) Communication among IDUs; (4) Communication between IDU and wired controller; (5) Connection between IDU and light board receiver;...
  • Page 43 DC Inverter VRF Fig. 4.6.1 4.6.2 Communication mode CAN bus mode is taken for communication between IDU and ODU and communication among IDUs. 4.6.3 Selection and connection mode 4.6.3.1 Select communication material Note: if air conditioners are installed at places where there’s strong electromagnetic interference, the communication wire of IDU and wired controller must use shielded wire and the communication wire between IDU and IDU/ODU must use shielded twisted pair.
  • Page 44 DC Inverter VRF Graphic of connection between IDU and wired controller Fig. 4.6.2 (2) Select communication wire between ODU and IDU Total Length L(m) of Communication Cable Wire size Material Material Type Remarks between IDU Unit and Standard IDU (ODU ) Unit 1.
  • Page 45 DC Inverter VRF Fig. 4.6.5 Fig. 4.6.6 (2) All communication wires of AOU are connected by screws. Fig. 4.6.7 (3) If a single communication wire is not long enough and needs to be connected, the connected joint must be welded or pressure-welded. Do not simply twist the wires together.

  • Page 46: Connection Method And Steps For System Communication

    DC Inverter VRF 4.6.4 Communication address Auto addressing technology is adopted for AOU IDU and ODU. No need to set address codes manually. Only the addresses of master unit and central control are needed to be set (address of central control is only needed when there are multiple refrigeration systems). Note: When installing remote monitor or central controller, displacement on indoor units’...
  • Page 47 DC Inverter VRF Fig. 4.7.2 Connection of modular units Note: ①For modular outdoor units, if there are multiple outdoor modules, then the master unit must be the first outdoor module on the communication wire and should not connect with IDU (master unit is set by SA8 of the outdoor main board).
  • Page 48 DC Inverter VRF 4.7.2 Communication connection between IDU and wired controller There are four kinds of connection between IDU and wired controller, as shown below: Fig. 4.7.3 One wired controller controls one IDU Fig. 4.7.4 Two wired controllers control one IDU Fig.
  • Page 49 DC Inverter VRF When two wired controllers control multiple IDUs, the wired controller can be connected to any one IDU, provided that the connected IDU is of the same series. Meanwhile, one and only one of the wired controllers must be set as a slave controller. At most 16 IDUs can be controlled by wired controllers and the connected IDUs shall be within a same IDU network.
  • Page 50 DC Inverter VRF Note: ①Wired controller and light board remote receiver can be used at the same time. ②When light board remote receiver is used, please use remote controller at the same time. 4.7.4 Communication connection of central controlling units Note:The centralized controller can be installed when it is necessary.

  • Page 51: External Electrical Wiring Diagram

    DC Inverter VRF 4.8 External Electrical Wiring Diagram Every unit should be equipped with a circuit breaker for short-circuit and overload protection. In general, circuit breaker is at OFF status. During operation, all indoor units and outdoor units belonging to the same system must be kept energized status. Otherwise, the unit can’t operate normally.

  • Page 52: Check Items After Installation And Trial Run

    DC Inverter VRF 4.8.2 External wiring diagram of modular connection Fig. 4.8.2 Note: maximum number of ODU (N) and maximum number of IDU (n) are based upon the combination type of ODU. For details, please refer to the introduction of units’ combination. 5 Check Items after Installation and Trial Run 5.1 Check Items after Installation Check Items...

  • Page 53: Trial Run

    DC Inverter VRF Check Items Conditions Might Happen Check Has the pipe length and refrigerant charging amount The refrigerant charging amount is not accurate. been recorded? The unit can not run normally. Communication Is the address code of outdoor modules correct? malfunction might happen.
  • Page 54 DC Inverter VRF Fig. 5.2.1 (2) When debugging starts, system will operate according to the ambient temperature. When outdoor temperature is above 20℃, debugging shall be in cooling mode. When outdoor temperature is below 20℃, debugging shall be in heating mode. (3) Before debugging, confirm again whether the cut-off valve of each basic module is fully turned on.
  • Page 55 DC Inverter VRF Description of each stage of debugging progress Debugging Progress code Status code —— code LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status light light blink System is allocating addresses. Master IDU is not set. Please set master 02_Allocate light light...
  • Page 56 DC Inverter VRF Description of each stage of debugging progress Debugging Progress code Status code —— code LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status System refrigerant is not enough. light light light System downtime equilibrium pressure is 09_Refrigerant lower than 0.3MPa.
  • Page 57 DC Inverter VRF Description of each stage of debugging progress Debugging Progress code Status code —— code LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status Debugging is enabled in heating mode light light light (debugging mode, auto-selected by system).
  • Page 58 DC Inverter VRF Step 6: Wait. Unit will then start progress 01 and 02; in progress 01, if master unit is not correctly set, progress 01 will show the following errors: Debugging Progress Code Status Code Code LED1 LED2 LED3 Meaning Progress Display...
  • Page 59 DC Inverter VRF Step 8: in progress 04, the quantity of IDUs needs to be confirmed manually. Main board of each module will display: Debugging code Progress code Status code LED1 LED2 LED3 Progress Display Display Display Code Code Code status status status...
  • Page 60 DC Inverter VRF If no error is detected, system will display as below and then start next progress. Debugging code Progress code Status code —— LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status 06_Detect No error is detected in outdoor outdoor Light...
  • Page 61 DC Inverter VRF Step 12: progress 08 is “Confirm preheated compressor” If more than 8h of preheat time is detected, system will display as below and start next progress. Debugging code Progress code Status code —— LED1 LED2 LED3 Meaning progress Display Display...
  • Page 62 DC Inverter VRF Debugging code Progress code Status code —— LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status 10_Status judgments of Light Light Light Outdoor valves are being turned on. outdoor valves before startup If unit detects that valve status is not normal, it will display as below: Debugging code Progress code Status code...
  • Page 63 DC Inverter VRF Debugging code Progress code Status code —— LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status 12_Status judgments of Manual calculation of refrigerant quantity Light Light Light outdoor valves is set up. before startup Step 17: after unit is confirmed to start debugging, system select cooling/heating mode according to ambient temperature.
  • Page 64 DC Inverter VRF B If heating mode is selected, relevant display is as below: Debugging Progress code Status code —— code LED1 LED2 LED3 Meaning progress Display Display Display Code code Code status status status Debugging is enabled in heating mode Light Light Light...
  • Page 65 DC Inverter VRF 5.2.3 Appendix: judgment reference of normal operational parameters Reference of Debug Parameters of AOU DC Inverter Multi VRF System Debug item Parameter name Unit Reference Outdoor ambient temp ℃ —— Discharge tube temp of ℃ ●When system compressor starts up, temp of discharge inverter compressor 1 tube or casing top in cooling mode is within 70~95℃...

  • Page 66: Common Malfunction And Troubleshooting

    DC Inverter VRF Reference of Debug Parameters of AOU DC Inverter Multi VRF System Debug item Parameter name Unit Reference Operating freq of fan Hz Adjusts in 0~65Hz according to system pressure. motor 1 Current of fan motor 1 Operating freq of fan Hz ●Adjusts in 0~65Hz according to system pressure.
  • Page 67 Otherwise, there will be collision malfunction of the project codes. For detail operation methods, please refer to the AOU Installation and Maintenance Manual. ②If problem can not be solved after checking the above items, please contact ALPICAIR service center and show phenomena and models. Following circumstance are not malfunction.

  • Page 68: Error Indication

    DC Inverter VRF 7 Error Indication Inquiry method of malfunction display: combine division number and content number to check the corresponding malfunction. Indoor: Error Code Content Error Code Content Malfunction of lower water Malfunction of IDU temperature sensor of water tank Malfunction of ambient temperature Protection of indoor fan sensor...
  • Page 69 DC Inverter VRF Outdoor: Error Code Content Error Code Content Current sensor of compressor 2 is Malfunction of ODU abnormal Current sensor of compressor 3 is High-pressure protection abnormal Current sensor of compressor 4 is Discharge low-temperature protection abnormal Current sensor of compressor 5 is Low-pressure protection abnormal High discharge temperature protection...
  • Page 70 DC Inverter VRF Error Code Content Error Code Content Malfunction of temperature sensor of Drive PFC protection of compressor oil-return 2 Over-current protection of inverter Malfunction of temperature sensor of compressor oil return 3 Drive IPM module protection of Malfunction of temperature sensor of compressor oil return 4 Malfunction of drive temperature...
  • Page 71 DC Inverter VRF Debugging: Error Code Content Error Code Content Preheat time of compressor is Alarm because ODU quantity is insufficient inconsistent Wrong setting of ODU’s capacity Abnormal communication of converter code/jumper cap Power supply phase sequence Emergency status of compressor protection Refrigerant-lacking protection Emergency status of fan...

  • Page 72: Maintenance And Care

    (5) After long period of shutdown, open the main power switch 8 hours before reoperating the unit so as to preheat the compressor crankcase. (6) Check if the outdoor unit is installed firmly. If there is something abnormal, please contact the ALPICAIR appointed service center.

  • Page 73: Maintenance After Seasonal Use

    ALPICAIR. Warranty should meet the folowing requirements: (1) First run of the unit should be operated by professional personnel from ALPICAIR appointed service center. (2) Only ALPICAIR manufactured accessories can be used on the machine.

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