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Constant Air Volume Duct
Service Manual
SYJS-07-2017 REV.A
Edition: 2017-07

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   Summary of Contents for Haier MVAH018MV2AA

  • Page 1

    Constant Air Volume Duct Service Manual SYJS-07-2017 REV.A Edition: 2017-07...

  • Page 2: Table Of Contents

    CONTENTS 1. Feature................................1 2. Specification ..............................2 3. Dimension ................................. 4 4. Piping diagram..............................7 5. Wiring diagram ..............................8 6. Electric characteristics ..........................10 7. Airflow and static pressure curves ....................... 11 8. Sound pressure level ............................. 14 9.

  • Page 3: Feature

    1. Feature •  DC constant air flow fan motor, getting higher efficiency and 0-200Pa auto adjusted ESP •  Capacity from 2.2kW to 16kW, suitable for variable demands. •  Built-in high lift drain pump •  Pre-set filter and fresh air inlet to improve indoor air quality. •  Only 280mm thickness makes it possible for installation in limited spaces...

  • Page 4: Specification

    2. Specification MVAH018MV2AA MVAH024MV2AA MVAH030MV2AA Rated Cooling Capacity Btu/hr 18,000  24,000  30,000  Rated Heating Capacity Btu/hr 20,000  27,000  34,000  Voltage,Cycle,Phase V/Hz/- 208/230-60-1 208/230-60-1 208/230-60-1 Fan Speed Stages 5+Auto 5+Auto 5+Auto Airflow (Turbo/High/Med/Low/ 618/529/482/435/347 765/647/588/529/424 941/824/735/647/529 Quiet) CFM Motor Speed (Turbo/High/Med/ 1178/1038/968/891/748 1015/864/786/720/626 1190/1077/990/864/720 Low/Quiet) RPM Max. External Static Pressure  0.80(200) 0.80(200) 0.80(200) in.W.G (Pa) Indoor Sound Level dB (Turbo/ 45/40/38/36/32 41/38/35/33/30...

  • Page 5

    MVAH036MV2AA MVAH042MV2AA MVAH048MV2AA Rated Cooling Capacity Btu/hr 36,000  42,000  48,000  Rated Heating Capacity Btu/hr 40,000  47,000  54,000  Voltage ,Cycle,Phase V/Hz/- 208/230-60-1 208/230-60-1 208/230-60-1 Fan Speed Stages 5+Auto 5+Auto 5+Auto Airflow (Turbo/High/Med/Low/ 1078/988/888/824/720 1200/1129/1047/953/860 1330/1235/1129/1047/960 Quiet) CFM Motor Speed (Turbo/High/Med/ 1390/1193/943/823/721 1400/1200/950/830/728 1448/1250/1110/958/825 Low/Quiet) RPM Max. External Static Pressure  0.80(200) 0.80(200) 0.80(200) in.W.G (Pa) Indoor Sound Level dB (Turbo/ 46/43/41/39/35 47/44/42/40/36 49/46/44/41/37 High/Med/Low/Quiet) Dimension: Height in (mm) 11 (280) 11 (280)

  • Page 6: Dimension

    3. Dimension Unit:inch(mm) MVAH018MV2AA dimension 11/16( ) 11/16( ) 6 11/16 ( ) Air outlet ) (111) (111)

  • Page 7

    MVAH024/302MV2AA dimension Unit:inch(mm) Name 29 1/8(740) 2 9/16 7 5/16 Gas pipe (65) (185) Liquid pipe Drainage hole Drainage hole of drain pan Wires connection hole Hanging bolt Fresh air inlet Air return Fresh air outlet 11/16(18) 29 1/2(750) 11/16(18) 44-Ø3/16(4) 4-Ø3/16(4) 1 1/8(28)

  • Page 8

    MVAH024/302MV2AA dimension Unit:inch(mm) 50 3/8(1280) 2 1/2(64) 2 1/2(64) Name Gas pipe Liquid pipe Drain hole Drain hole of drain pan Wiring connector hole Hanging bolt Air return Fresh air inlet Fresh air out let 55 1/4(1404) 11/16(18) 53 7/8(1368) 11/16(18) 4-Φ3/16(4) 4-Φ3/16(4)

  • Page 9: Piping Diagram

    4. Piping diagram Gas pipe Liquid pipe Filter Filter     Indoor heat exchanger...

  • Page 10: Wiring Diagram

    5. Wiring diagram MVAH018/024/030MV2AA DC Slim Duct Wiring Diagram Up/Down Swing1 Left/Right Swing2 Liquid Pipe Ambient Gas Pipe Sensor Sensor Sensor CN11 CN35 CN18 G CN19 B CN11-1 DCFAN Up/Down CN21 LED5 CN31 R LED7 CN6 WH CN10 R SW01 SW03 LED3 Room Card...

  • Page 11

    MVAH036/042/048MV2AA DC Slim Duct Wiring Diagra m CN39 CN12 CN10 CN10 SW01 CN37 Power Supply DC FAN Room CN16 Main Control Card Board MOTOR FUSE Board LED3 LED4 T8A/250VAC Gas Pipe Sensor TC 1 LED5 CN18 Liquid Pipe Sensor CN19 SW03 Float Switch CN21...

  • Page 12: Electric Characteristics

    6. Electric characteristics Power  Units Indoor fan motor Power input (W) supply Model Phase Voltage Volt. range MCA MFA Output (W) FLA Cooling Heating MVAH018MV2AA 50/60 198~242 1.93 6.16 1.54 MVAH024MV2AA 50/60 198~242 2.60 8.32 2.08 252.3 252.3 MVAH030MV2AA 50/60 198~242 2.68 8.56 2.14 259.3 259.3...

  • Page 13: Airflow And Static Pressure Curves

    7. Airflow and static pressure curves MVAH018MV2AA air flow and static pressure curves Super high High Super low 0.00 0.08 0.16 0.24 0.32 0.40 0.48 0.56 0.64 0.72 0.80 0.88 Static pressure (IWC) MVAH024MV2AA air flow and static pressure curves...

  • Page 14

    MVAH030MV2AA air flow and static pressure curves Super high High Super low 0.00 0.08 0.16 0.24 0.32 0.40 0.48 0.56 0.64 0.72 0.80 0.88 Static pressure (IWC) MVAH036MV2AA air flow and static pressure curves 1100 1050 1000 Super high High Super low 0.00 0.20...

  • Page 15

    MVAH042MV2AA air flow and static pressure curves 1200 1150 1100 1050 1000 Super high High Super low 0.00 0.20 0.40 0.60 0.80 Static pressure (IWC) MVAH048MV2AA air flow and static pressure curves 1300 1250 1200 1150 1100 Super high 1050 1000 High Super low...

  • Page 16: Sound Pressure Level

    8. Sound pressure level (1) Testing illustrate: Air outlet duct Air return duct Unit Sound level meter Outlet side Testing position just below the central of the unit (2) Testing condition: a. Unit running in the standard condition b. Test in the semi-anechoic chamber c. Noise level varies from the actual factors such as room structure, etc. MVAH018MV2AA MVAH024MV2AA NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20...

  • Page 17: Installation

    9. Installation 9.1 Parts and functions Indoor unit air duct soft connection air outlet port air inlet port 9.2 Safety •  If the air conditioner is transferred to a new user, this manual shall be transferred to the user, together with the  conditioner. •  Before installation, be sure to read Safety Considerations in this manual for proper installation. •  The safety considerations stated below is divided into “   Warning” and “   Attention”. The matters on severe  accidents caused from wrong installation, which is likely to lead to death or serious injury, are listed in “ Warning”.  However, the matters listed in “   Attention” are also likely cause the severe accidents. In general, both of them  are the important items related to the security, which should be strictly abided by. •  After the installation, perform test run to make sure everything is in normal conditions, and then operate and  maintain the air conditioner in accordance with the User Manual. The User Manual should be delivered to the user  for proper keeping.

  • Page 18

    WARNING •  Please ask the special maintenance station for installation and repair. Water leakage, electric shocks or fire  accidents might be caused from improper installation if you conduct the installation by your own. •  The installation should be conducted properly according to this manual. Water leakage, electric shocks or fire  accidents might be caused from improper installation. Please make sure to install the air conditioner on the place  where can bear the weight of the air conditioner. •  The air conditioner can’t be installed on the grids such as the non-special metal burglar-proof net. The place with  insufficient support strength might cause the dropdown of the machine, which may lead to personal injuries. •  The installation should be ensured against typhoons and earthquakes, etc. The installation unconformable to the  requirements will lead to accidents due to the turnover of the machine. •  Specific cables should be used for reliable connections of the wirings. Please fix the terminal connections reliably  to avoid the outside force applied on the cables from being impressed on the cables. Improper connections and  fixings might lead to such accidents as heating or fire accidents. •  Correct shapes of wirings should be kept while the embossed shape is not allowed. The wirings should be reliably  connected to avoid the cover and the plate of the electrical cabinet lipping the wiring. Improper installation might  cause such accidents as heating or fire accidents. •  While placing or reinstalling the air conditioner, except the specific refrigerant (R410A), don’t let the air go into the  refrigeration cycle system. The air in the refrigeration cycle system might lead to the cracking or personal injuries  due to abnormal high pressure of the refrigeration cycle system. •  During installation, please use the accompanied spare parts or specific parts. If not, water leakage, electric  shocks, fire accidents or refrigerant leakage might be caused. •  Don’t drain the water from the drainpipe to the waterspout where may exist harmful gases such as sulfureted gas  to avoid the harmful gases entering into the room. •  During installation, if refrigerant leakage occurs, ventilation measures should be taken, for the refrigerant gas  might generate harmful gases upon contacting the flame. •  After installation, check if any refrigerant leakage exists. If the refrigerant gas leaks in the room, such things as air  blowing heaters and stoves, etc. may generate harmful gases. •  Don’t install the air conditioner at the places where the flammable gases may leak. In case the gas leakage  occurs around the machine, such accidents as fire disasters may be caused.

  • Page 19

    Attention It is not allowed to put any heating 3-minute protection apparatus under the indoor units, for the To protect the unit, compressor can be heat may cause distortion of the units. actuated with at least 3-minute delay after stopping. Pay attention to the aeration condition Close the window to avoid outdoor air...

  • Page 20: Maintenance

    9.3 Maintenance * Only when the air cleaner is switched off and disconnected to the power supply can it be cleaned, or electric shock and injury may appear. Cleaning the air outlet port and the shell: Attention •  Don’t use gasoline, benzene, diluents, polishing powder or liquid insecticide to clean them. •  Do not clean them with hot water of above 50°C to avoid fading or distorting. •  Wipe them with soft dry cloth. •  Water or neutral dry cleanser is recommended if the dust cannot be removed. •  The Wind Deflector can be dismantled to clean (as below). Cleaning Wind Deflector: •  Do not wipe the wind deflector with water forcibly to avoid falling off. Cleaning Air Cleaner: Attention •  Don’t rinse the air cleaner with hot water of above 50°C to avoid fading and distorting. •  Don’t put the air cleaner on the fire to dry to avoid catching fire. •  Wipe dust with water or dust collector. (B) Clean it with soft bush in mild detergent (A) Wipe dust with dust collector.  if there is too much dust on it Throw off the water and airing it in the cool dry condition. Maintenance before and after Operating Season Before Operating Season: 1. Please make the following checkup. If abnormal condition occurs, consult the after-service personnel. •  There is no blockage in inlet port and outlet port of outdoor and indoor units. •  The ground line and the wiring are in the proper state 2. After cleaning, the air cleaner must be mounted. 3. Switch on to the power.

  • Page 21: Fault Checkup

    9.4 Fault checkup Please check the following when consigning repair service: Symptoms Reasons Water flow sound can be heard when starting operation, during operation or immediately after stopping operation. When it starts •  Water flow sound to work for 2-3 minutes, the sound may become louder, which is the flowing sound of refrigerant or the draining sound of condensed water. During operation, the air conditioner may make the cracking •  Cracking sound sound, which is caused from the temperature changes or the slight dilation of heat exchanger. The terrible smell, caused from walls, carpet, furniture, clothing, •  Terrible smell in outlet air cigarette and cosmetics, attaches on the conditioner. When switching it on again after power failure, turn on the manual •  Flashing operating indicator power switch and the operating indicator flashes. It displays the awaiting indication as it fails to perform refrigerating operation while other indoor units are in heating operation. When •  Awaiting indication the operator set it to the refrigerating or heating mode and the operation is opposite to the setting, it displays the awaiting indication. To prevent oil and refrigerant from blocking the shutdown indoor units, refrigerant flows in the short time and make the sounds •  Sound in shutdown indoor unit or  of refrigerant flowing. Otherwise, when other indoor units performs white steam or cold air heating operation, white steam may occur; during refrigerating operation, cold air may appear. When the conditioner is powered on, the sound is made due • ...

  • Page 22: Installation Procedures

    9.5 Installation procedures The  standard  attached  accessories  of  the  units  of  this  series  refer  to  the  packing;  prepare  other  accessories  according to the requirements of the local installation point of our company. 1. Before installation [before finishing the installation, don’t throw away the attached parts required for the installation] •  Determine the route to move the unit to the installation site; • ...

  • Page 23

    3. Preparation before Installation (1) Location relation between inspection hole on the ceiling and  the unit and the hoisting studs (unit: in).                          Size Model (in) (in) (in) (in) AD009-018MV2AA 18 5/8 29 1/2 27 3/8 AD024-030MV2AA 38 7/8 18 5/8 29 1/2 27 3/8 AD036-048MV2AA 55 1/4 20 7/8 53 7/8 31 3/8 (2) If necessary, make a hole for installation and inspection on the ceiling. (used for the situation with a ceiling) •  For the size of the inspection hole on the ceiling, please refer to the above drawing. •  Before installation, finish all the preparations for all piping connected to indoor units (refrigerant, water drainage)  and wiring (connection line of the line control, connection line between indoor units and outdoor unit) so that they  can be connected with indoor units right after installation. •  For the inspection hole, the ceiling might be reinforced to keep the evenness of the ceiling and avoid the vibration  of the ceiling. For details, please consult the construction contractor. Notch grapping Plug (3) Install the hoisting studs (3/8''bolts) notch plug In order to support the weight of the unit, use barb bolts in the situation with a ceiling. In the situation with...

  • Page 24

    Static Pressure Range unit: Pa Static Pressure Range 0~200 4. Drainpipes 20 /8 MVAH009-030MV2AA Unit:in 18 5/8 drainp ipe 16 1/4 gasp ipe liquid pipe 18 3/8 MVAH036-048MV2AA 11 /8 11 /8 18 3/8 18 3/8 (a) Keep a gradient (1/50-1/100) of the drainpipes and avoid lobbing or curving. •  Proper Piping •  Improper Piping bolt hanging 39 3/8~78 6/8in avoidl obing avoid curving airo utletp ort...

  • Page 25

    Wash port Drainage hose Wash port Sealing washer [for insulation] Joint (purchased at local shop) (accessory) Main unit hard PVC tube (purchased at locals hop) Drainage hose Thread clip Binding Sealing washer [for insulation](accessory) (accessory) Sealing washer [for insulation](accessory) Ensure the biggesth eightd ifference (about 37 /8in) (d) When the laid drain piping is used for multiple equipments, the public piping should be lower about 3 7/8in  than the...

  • Page 26

    Before completing the electrical connection, a gibbose connector shall be installed on the drainpipe as to provide  it with a water inlet port. Then, if any leakage exists in the piping, check it to make the water flow of the drainpipe  smooth. 5. Installation of Air Return & Air Exhaust Pipes For the choice and installation of air return port, air return pipe, air exhaust port and exhaust pipe, please consult  service personnel of Haier company. Calculate the design chart and exterior static pressure, and select the exhaust  pipe with appropriate length and shapes. Main unit of air conditioner Ceiling  Air return surface pipe (purchased Special exhaust...

  • Page 27

    7.Connection of return air duct (setting back air return opening when leaving factory) Remarks: In installation, you can select the lower air return or back air return by adjusting the location of air inlet frame. Air  return from bottom will influence the unit noise, so we suggest use rear return installation.                           Size Model (in) (in) MVAH009~018MV2AA 7 7/8 MVAH024~030MV2AA 29 1/8 7 7/8 MVAH036~048MV2AA 50 3/8 9 2/8 Back air return opening Below air return opening 8.Concatenation means of exchanging flesh air (1)  Cut  away  the  nummular  component  of  (2) Install the nummular air pipe (air pipe can be ...

  • Page 28

    9.Install outlet flange Install outlet flange according to the needs, the outlet flange is standard component, bolts are laid in accessories  box. ceiling Note: You can select not to connect with the flange. Instead of it, you can use the round plastic air outlet (purchased  by user) 10. Examples for Bad Installation •  The unit is not equipped with the air return pipe and the inner side of the suspending ceiling is used as the blast  pipe, causing the humidity increasing due to irregular air mass, strong wind or sunlight from the outside world. •  There might be condensate dropping down at the outer side of the blast pipe. The humidity is high, even if the  inner side of the suspended ceiling isn’t used as a blast pipe in new concrete buildings. At this time, the whole  body should use the thermo wool for heat preservation (the thermo wool can be packed with a steel wire). •  It is operated under the conditions beyond the limits, leading to the overload of the compressor. •  Affected by the capacity of the exhaust fan, and the strong wind and wind direction in the outer flue, when the  blowing quantity of the air conditioner exceeds the limits, the drained water of the heat exchanger will overflow,  causing water leakage. Exhaust fan Example of bad installation The static pressure range of each gradeas  11. Static Pressure GradeSetting follows: For MVAH036~048MV2AA units, after installation need to  Grade Static pressure range preliminary estimates external static pressure, according to the ...

  • Page 29

    Tubing Materials & Specifications Model MVAH009~018MV2AA MVAH024~048MV2AA Gas pipe Ф1/2 Ф5/8 Tubing Size  Liquid pipe Ф1/4 Ф3/8 Tubing Material Phosphor deoxybronze seamless pipe (TP  ) for air conditioner Refrigerant Filling Amount Add the refrigerant according to the installation instruction of outdoor unit. The addition of R410A refrigerant must  be performed with a measure gage to ensure the specified amount or compressor failure can be caused by filling  too much or little refrigerant. Connecting Procedures of Refrigerant Tubing Proceed the flare tube connecting operation to connect all the refrigerant tubes. •  Dual wrenches must be used in the connection of indoor unit tubing. •  Mounting torque refers to the right table Outer Diameter of Tubing  Mounting Torque Ф1/4 11.8~13.7N.m Ф3/8 32.7~39.9N.m Wrench Ф1/2 49.0~53.9N.m Ф5/8 78.4~98.0N.m Ф3/4 97.2~118.6N.m Connecting Cutting and Enlarging Connecting circular terminals: Cutting or enlarging pipes should be ...

  • Page 30: Electrical Wiring

    9.6 Electrical wiring WARNING •  Electrical construction should be made with specific mains circuit by the qualified personnel according to the  installation instruction. Electric shock and fire may be caused if the capacity of power supply is not sufficient. •  During arranging the wiring layout, specified cables should be used as the mains line, which accords with  the local regulations on wiring. Connecting and fastening should be performed reliably to avoid the external  force of cables from transmitting to the terminals. Improper connection or fastness may lead to burning or  fire accidents. •  There must be the ground connection according to the criterion. Unreliable grounding may cause electrical  shocks. Do not connect the grounding line to the gas pipe, water pipe, lightening rod and telephone line. ATTENTION •  Only copper wire can be used. Breaker for electric leakage should be provided, or electric shock may occur. •  The wiring of the mains line is of Y type. The power plug L should be connected to the live wire and plug N  connected to null wire while   should be connected to the ground wire. For the type with auxiliary electrically  heating function, the live wire and the null wire should not be misconnected, or the surface of electrical heating  body will be electrified. If the power line is damaged, replace it by the professional personnel of the manufacturer  or service center. •  The power line of indoor units should be arranged according to the installation instruction of indoor units. •  The electrical wiring should be out of contact with the high-temperature sections of tubing as to avoid melting the  insulating layer of cables, which may cause accidents. •  After connected to the terminal tier, the tubing should be curved into be a U-type elbow and fastened with the  pressing clip. •  Controller wiring and refrigerant tubing can be arranged and fixed together. •  The machine can’t be powered on before electrical operation. Maintenance should be done while the power is  shut down. •  Seal the thread hole with heat insulating materials to avoid condensation. • ...

  • Page 31

    Signal Wiring Drawing Wired controller Wired controller Wired Wired Wired Wired controller controller controller controller Wired Wired controller controller Outdoor units are of parallel connection via three lines with polarity. The master unit, central control and all indoor  units are of parallel connection via two lines without polarity. There are three connecting ways between wired controller and indoor units: A. One line control controls multiple units, i.e. 8 indoor units, as shown in the above figure, (1-5 indoor units).The  indoor unit 5 is the line-controlled main unit and others are the ine-controlled sub units. The wired control and the  main unit (directly connected to the indoor unit of line control) are connected via three lines with polarity. Other  indoor units and the main unit are connected via three lines with polarity.SW01 on the main unit of line control is  set to 0 while SW01 on other sub units of line control are set to 1, 2, 3 and so onin turn. B. One line control controls one indoor unit, as shown in the above figure(indoor unit 6-19). The indoor unitand the  line control are connected via three lines with polarity. C. Two wired controller control one indoor unit, as shown in the figure (indoor unit 20). Either of the wired controller can be set to  be the master wired controller while the other is set to be the auxiliary wired controller. The master wired controller and indoor  units, and the master and auxiliary wired controller are connected via three lines with polarity. When the indoor units are controlled by the remote control, switch over the modes by Switching Mode of Line-Controlled Main Unit/ Line-Controlled Sub Units/ Remote-Controlled Types. The signal terminals needn’t to be equipped with wires and connected to the line control.

  • Page 32

    Indoor power supply wiring & signal wiring between indoor and outdoor & signal wiring between indoor. Rated current of residual  Cross Sectional Area of  Items Rated  Signal Line Cross Circuit Breaker(A)  Total Length Current of  Section Ground Fault  Outdoor- Indoor- Current of in.(m) Overflow  AWG(mm Interruptor(mA) indoor AWG indoorAWG Indoor Unite(A) Breaker(A) Response time(S) <7 14(2.5) 65.6(20) 10 A, 30mA, 0.1S or below ≥7 and <11 12(4) 65.6(20) 16 A, 30mA, 0.1S or below 2 cores×AWG18- ≥11 and <16 10(6) 82(25) 20 A, 30mA, 0.1S or below AWG14(0.75-2.0 mm shielded line ≥16 and <22 8(8) 98.4(30)

  • Page 33: Pcb Photo

    10. PCB Photo PCB code:0151800244 (used for the unit: MVAH018MV2AA, MVAH024MV2AA, MVAH030MV2AA) LED5 LED7 SW01 SW03 LED3 LED4 LED6 LED1 LED2...

  • Page 34

    PCB code:0151800227A  (used for the unit: MVAH036MV2AA, MVAH042MV2AA, MVAH048MV2AA) SW03 SW01 Power supply board code:0151800311A  (used for the unit: MVAH036MV2AA, MVAH042MV2AA, MVAH048MV2AA)

  • Page 35: Dip Switch Setting

    2# (wire controlled slave unit) SW01_3 indoor unit  3# (wire controlled slave unit) SW01_4 … … … … …… 15# (wire controlled slave unit) Capability of indoor unit SW01_5 18000BTU (MVAH018MV2AA) SW01_6 Capability of  SW01_7 indoor unit 24000BTU (MVAH024MV2AA) SW01_8 30000BTU (MVAH030MV2AA) (B) Definition and description of SW03 Communication Central control  address address ON OFF OFF OFF OFF OFF OFF OFF...

  • Page 36: 0151800227a Pcb

    11.2 0151800227A PCB SW01  is  used  to  set  wire  controlled  address  of  and  set  capabilities  of  master;  SW03  is  used  to  set  indoor  unit  address (combine original communication address and address of centralized controller) (A) Definition and description of SW01 Address of wire controlled indoor unit (group address) 0# (wire controlled master unit) (default) SW01_1 1# (wire controlled slave unit) Address of  SW01_2 wire controlled  2# (wire controlled slave unit) SW01_3 indoor unit ...

  • Page 37: Indoor Unit Control

    12. Indoor unit control 12.1 Cooling operation Set temp. in cooling: Ts=set temp. wired controller; After startup, indoor unit will send the request to outdoor according to the temp. difference between the set temp.  and the room temp. 12.2 Heating operation Set temp. in heating: Ts=set temp. wired controller + TA correcting value. After startup, indoor unit will send the request to outdoor according to the temp. difference between the set temp.  and the room temp. 12.3 Dry operation Room temp. - set temp. > 2°C indoor operation is identical with the cooling operation, and send the cooling mode to  outdoor; Room temp. - set temp.  ≤ 2°C indoor will send the dry signal to outdoor, and indoor fan motor will run at low speed  compulsorily when compressor is running; when room temp.  <16°C indoor stops and sends stop signal to outdoor. In dry operation, the auto mode of indoor fan motor is identical with the cooling mode; EEV control mode is identical  with the cooling operation. 12.4 Fan operation Indoor fan motor will run at the speed set on the wired controller and sends stop signal to outdoor. 12.5 Abnormal operation When the requested mode collides with the outdoor mode, the entering earlier will be in prior. After indoor receives  the startup command from wired controller (remote controller), firstly judge the outdoor current mode. If it is normal  mode, the indoor will run as the request of wired controller; if it is abnormal mode, the command can not be  executed, and indoor keeps stop; wired controller displays standby mode (if in remote control type, the buzzer will  sound twice and the remote controller can not receive the signal). Until the outdoor stops or the outdoor mode is  accordant with the requested mode of wired controller (remote controller), the outdoor will work. COOL (including  AUTO COOL), DRY, RECOVERY are regarded as the same mode; HEAT, RECOVERY are as abnormal mode. 12.6 Fan speed control of indoor fan motor a.  Adjustment by hand Set high/ mid/ low fan speed as the request.

  • Page 38

    12.8 Anti-freeze protection  In cooling mode, execute the anti-freeze protection due to the measured indoor coil temp. to avoid the indoor heat  exchanger causing frost or ice. 12.9 Swing motor control Indoor will control swing motor ON/OFF due to the swing signal from wired controller. 12.10 Auxiliary electric heater control In heating mode, if the below conditions can be met, the electric heater will work: (1) Indoor fan motor and compressor are running; (2) Air inlet temp. is no more than 22°C; (3) Room temp. is lower over 2°C than the set temp.; (4) Compressor has run for 5 seconds; Either below condition is met, the electric heater will stop: (1) Indoor fan motor or compressor not runs; (2) Indoor air inlet temp. is over 23°C; (3) Indoor air inlet temp. is higher over -1°C than the set temp.; (4) Unit stops or quit the heating mode. 12.11 Filter cleaning Check and memorize the running time of indoor fan motor, once arriving the requested time (set by SW07-6), indoor  will send filter cleaning signal to wired controller; when indoor receives the filter reset signal from wired controller, if  the time exceeds the requested time, the filter will reset. 12.12 Compulsory defrosting After indoor receives the compulsory defrosting signal from wired controller, it will send compulsory defrosting  signal to outdoor continuously for 10 times. In the sending period, indoor will execute the normal defrost. 12.13 Trial operation Set the mode as cooling (heating), press ON/OFF for 5 seconds to enter compulsory cooling (heating).   In compulsory cooling, display "LL" and COOL will flash;...

  • Page 39

    [05] EEPROM failure If the chip is fixed well Reconnect Replace it If the chip is damaged Check if PCB is faulty, if yes, replace it [09] Indoor address repeated  If wiring between P and Modify the wiring         Q is normal If communication wire is Modify the communication  connected with multi  wire outdoors   If indoor QTY connected with      outdoor is normal Check outdoor connecting  board,if faulty, replace it...

  • Page 40: Failure Code

    13. Failure code Failure code  PCB LED5(Indoor  at wired  Units)/ Receiver Timer  Fault Descriptions controller Lamp(Remote Controller) Indoor ambient temp. sensor TA failure Indoor coil pipe temp. sensor TC1 failure Indoor coil pipe temp. sensor TC2 failure Indoor EEPROM failure Communication between indoor and outdoor failure Communication between indoor and wired controller  failure Indoor float switch failure Indoor address repeated failure Indoor unit 50Hz zero-crossing failure DC motor model is wrong DC motor failure Communication between DC motor and PCB The 4-way valve of 3-pipe valve box reversing failure Outdoor failure code...

  • Page 41: Troubleshooting

    14. Troubleshooting Indoor failure diagnose [08] Indoor drainage system failure/float switch circuit on indoor PCB failure Reconnect If CN13 is fixed well   If float switch works     If CN4 is  Modify the wiring  with AC220V and the circuit     voltage Check indoor PCB and replace it if necessary If water pump works Check water pump        If water Modify the wiring pump is electrified   and the circuit Replace water pump [1/2/3/4/15] Indoor sensor failure     If sensor terminal is fixed well Reconnect    If sensor resistor Replace sensor /characteristic is proper Check if PCB is faulty, if yes, replace it...

  • Page 42

    [06] Communication circuit between indoor and outdoor  If wiring between P and  Modify the communication wire Q is wrong or broken  down  If the port of CN15 on  Modify the port indoor PCB is normal          If the port of CN19 on outdoor connecting board is normal Electrify the outdoor If outdoor power source is normal Clear the failure code If power supply is failure Check and eliminate noise If there is noise Check outdoor PCB, if faulty, replace it...

  • Page 43

    [07] Communication abnormal between indoor and wired controller If wiring of terminal A, B, C of Modify the wiring    wired controller is proper  If the broken wire or port is Modify the connection          fixed improperly If in group operation   Set one indoor If there is indoor unit   unit as No. 0       set as No. 0 Set only one indoor If there are multi indoors         set as No. 0 unit as No. 0   Set one indoor            If there is indoor unit   unit as No. 0                  set as No. 0 If indoor unit is running      If LED2 on indoor PCB is ON, Check indoor PCB, if which indicate the serial signal  faulty, replace it         sent to wired controller      If  LED1 on indoor PCB is ON, which indicate the serial signal         sent to wired controller Check wired controller PCB, if faulty, replace it...

  • Page 44

    [12] No 50Hz zero passage signal Check if the Replace transformer is well transformer   Check if the wiring of the  Reconnect   wired controller connect well Replace PCB...

  • Page 45

    [14] DC motor failure Check if the wiring of motor  Reconnect is fixed well Replace motor If the motor is fault Replace the PCB...

  • Page 46

    [18] The 4-way valve of 3-pipe valve box reversing failure Adjust  it  correctly  by  after-sales  If the 4-way valve of 3-pipe  personnel on site. valve box is internal leakage Check if the TC1 and TC2 of indoor  Adjust  it  correctly  by  after-sales  unit are normal, if the resistance is  personnel on site. right? If the connect well?        Adjust  it  correctly  by  after-sales  If  the  4-way  valve  of  outdoor  personnel on site. unit is internal leakage Replace the driver module, if it is normal Replace the driver module If  the  pressure  difference  between  high  and  low  pressure  less  than  If exceeds the running range of the ...

  • Page 47: Capacity

    17036  12214  17357  12536  18321  12214  18643  12214  18964  12536  19607  12214  20250  11893  17036  12214  17357  12536  18000  12214  18321  12214  18643  12536  19286  12214  20250  11893  MVAH018MV2AA 90.5 16714  12214  17036  12214  17679  11893  18321  12214  18643  12536  19286  12214  19929  11893 ...

  • Page 48

    Indoor Temp. Outdoor  70.7°FDB 73.4°F DB 77°F DB 80.6°F DB 82.4°F DB 86°F DB 89.6°F DB Model Temp. 59°F WB 60.8°F WB 64.4°F WB 66.2°F WB 68°F WB 71.6°F WB 75.2°F WB °F DB 35357  27321  36000  27964  37286  27321  38250  27643  38893  28607  40179  27643  41786  27000  72.5 35036  27000  35679  27643  36964  27000  37929  27321  38571  28286  39857  27643  41464  27000  34714 ...

  • Page 49

    13333  13016  13016  15238  15238  14921  13651  17143  16825  15556  13651  19048  18730  15556  13651  36.5 20000  19683  15556  13651  MVAH018MV2AA 42.8 20317  20000  15556  13651  43.7 20952  20000  15556  13651  22540  20000  15556  13651  54.5 23810  20000  15556  13651 ...

  • Page 50

    Indoor Temp. (°F DB) Outdoor Temp. Model 68.0 77.0 80.6 °F WB SHC (Btu/h)  SHC (Btu/h) SHC (Btu/h) SHC (Btu/h) 26880  26240  26240  25920  30720  30080  29760  27520  34240  33920  31360  27520  38080  37760  31360  27520  36.5 40000  39680  31360  27520  MVAH036MV2AA 42.8 40000  40000  31360  27520  43.7 42240  40000 ...

  • Page 51

    Haier Commercial Air Condition Web: Http://www.haier.com Haier reserves the right to make change without any notice.

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