MAXA BDS28A Technical Manual
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MAXA BDS28A Technical Manual

Split mono dc inverter
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TECHNICAL MANUAL 2013
SPLIT MONO DC INVERTER
MODELS
BDS28A
BDS35A
This manual has been created for informative purpose. The company declines every responsibility for the results of projecting or installation based on the explanations and the technical specifications given
in this manual. Is besides forbidden the reproduction under any form of the texts and of the figures contained in this manual.

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  • Page 1 TECHNICAL MANUAL 2013 SPLIT MONO DC INVERTER MODELS BDS28A BDS35A This manual has been created for informative purpose. The company declines every responsibility for the results of projecting or installation based on the explanations and the technical specifications given in this manual. Is besides forbidden the reproduction under any form of the texts and of the figures contained in this manual.
  • Page 2 Serie / Series / Serie / Serie TECHNICAL MANUAL MONO DC INVERTER Emissione / Issue Sostituise / Supersade Ausgabe / Emission Ersetzt / Remplace 04 - 2013 Catalogo / Catalogue / Katalog / Catalogue MTE01028D2505-00...

  • Page 3: Table Of Contents

    Index 1. SPECIFICATIONS ............................4 2. CHARACTERISTICS DATA........................6 2.1 Operation characteristic curve ........................6 2.2 Capacity variation ratio according to temperature ..................6 2.3 Noise criteria curve ...........................6 2.4 Operation data ............................6 3. DIMENSIONS ............................7 3.1 Indoor units ...............................7 3.2 Outdoor units ............................7 4.

  • Page 4: Specifications

    1. SPECIFICATIONS Models of indoor units BDS28A BDS35A Rated voltage 220-240V ~50Hz 2,5(0,7 ~ 4,4) 3,5(0,7 ~ 4,5) Total capacity Btu/h 8,53(2,3 ~ 15,00) 11,9(2,3 ~ 15,3) Cooling Power input Rated current S.E.E.R. 7,5-A++ 7-A++ 2,7(0,7 ~ 4,8) 3,5(0,7 ~ 5,5)
  • Page 5 Fan motor capacitor μF Air flow volume of outdoor unit m³/h 2000 2000 Fan type-piece Axial-flow Fan diameter Φ445 Φ445 Defrosting method Automatic Defrosting Climate type Isolation Moisture protection IP24 IP24 Permissible excessive operating pressure for the discharge side Permissible excessive operating pressure for the suction side Sound pressure level dB(A)

  • Page 6: Characteristics Data

    WB24 Indoor air flow:Super High Indoor air flow: Super High BDS35A Pipe length: 5m Pipe length: 5m BDS35A BDS28A BDS28A Compressor speed (rps) Compressor speed (rps) 2.2 Capacity variation ratio according to temperature n i l n i t BDS28A...

  • Page 7: Dimensions

    (°C) pressure temp. Indoor fan speed name speed revolution (rps) Indoor Outdoor P(MPa) T1 (°C) T2 (°C) BDS28A In: 33~35 In: 3~5 20/15 2,0~2,6 Super high Super high Out: 42~44 Out: 3~5 BDS35A Notes: (1) Connecting piping condition: 5m.

  • Page 8: Refrigerant Diagram

    4. REFRIGERANT DIAGRAM GAS SIDE 3-WAY VALVE 4-Way valve Discharge HEAT EXCHANGE (EVAPORATOR) Suction Accumlator COMPRESSOR HEAT EXCHANGE (CONDENSER) LIQUID SIDE 2-WAY VALVE r t S n i a r t S n i a Electron expansion valve COOLING HEATING...

  • Page 9: Electrical Circuit Diagram

    5. ELECTRICAL CIRCUIT DIAGRAM 5.1 Indoor units: BDS28A, BDS35A MAGNETIC RECEIVER AND POWER RING ROOM TUBE DISPLAY BOARD MOTOR BN(BK) TEMP.SENSOR TEMP.SENSOR BU(WH) YEGN(GN) CONN WIRE N(1) DC-MOTOR ROOM TUBE DISP1 DISP2 COM-OUT YEGN TERMINAL AC-L L-OUT BOARD JUMP PRINTED CIRCUIT BOARD...

  • Page 10: Printed Circuit Board

    6. PRINTED CIRCUIT BOARD 6.1 Indoor unit: BDS28A, BDS35A Part name DC fan Microswitch Electrostatic precipitation Small up & down swing interface Left and right Big up & down swing interface Display interface Ambient temperature sensor Tube temperature sensor Outdoor unit live wire...

  • Page 11: Control Functions

    7. Control functions 7.1. Temperature Parameters • Indoor preset temperature (T preset • Indoor ambient temperature (T 7.2. Basic functions Once energized, the compressor should in no way be restarted unless after at least 3-minute time interval. In case of having memory function, for the first energization, the compressor will be started without 3-minute lag, if being under the condition of power-off, and the compressor will have 3-minutes delay to be started under the condition of power-on.
  • Page 12 7.2.2 Dehumidifying mode 7.2.2.1 The condition and process of dehumidifying If T > T , DRY mode will act, the indoor fan, outdoor fan and compressor will run, and indoor fan will run at low amb. preset speed. If T - 2°C ≤...
  • Page 13 7.2.3.3 Protection function ♦ Anti-cold – wind protection In HEAT mode, in order to prevent the indoor unit from blowing out cold wind, each time the compressor starts, the indoor fan will delay 3 minutes after the compressor to run at the latest and it can adjust fan speed automatically when temperature is low.
  • Page 14 ② Protection a) In cooling operation, protection is the same as that under the cooling mode; b) In heating operation, protection is the same as that under the heating mode; c) When ambient temperature changes, operation mode will be converted preferentially. Once started, the compressor will remain unchanged for at least 6 minutes.

  • Page 15: Troubleshooting

    ⑦ Faults of temperature sensors Designation of sensors Faults Indoor ambient temperature The sensor is detected to be open-circuited or short-circuited for successive 30 seconds. Indoor tube temperature The sensor is detected to be open-circuited or short-circuited for successive 30 seconds. Outdoor ambient temperature The sensor is detected to be open-circuited or short-circuited for successive 30 seconds.

  • Page 16: Flashing Led Of Indoor/Outdoor Unit And Primary Judgement

    8.3 Flashing LED of Indoor/Outdoor unit and primary judgement Display Method of Indoor Unit Display Method of Outdoor Unit Indicator has 3 kinds of display Indicator Display (during status and they will be displayed blinking, ON 0.5s and OFF circularly every 5s. Malfunction 0.5s) A/C status...
  • Page 17 1. No jumper cap insert on mainboard. Wireless remote 2. Incorrect insert of Malfunction receiver and button Blinks 15 jumper cap. are effective, but can protection of 3. Jumper cap times not dispose the jumper cap damaged. related command 4. Abnormal detecting circuit of mainboard.
  • Page 18 1. Overload or temperature is too All loads operate Decrease high. normally, while frequency due Blinks Blinks 2. Refrigerant is operation frequency for to high air 9 times twice insufficient; compressor is discharge 3. Malfunction of decreased electric expansion valve (EXV. All loads operate Limit/decrease normally, while...
  • Page 19 After the complete unit is deenergized for During cooling 20mins, check operation, whether the thermal compressor will stop grease on IPM Module high while indoor fan will Blinks 19 Module of outdoor temperature operate; control panel AP1 is times protection During heating sufficient and whether operation, the...
  • Page 20 Indoor unit and compressor and Indoor unit and Blinks 19 Blinks 16 outdoor unit outdoor fan motor outdoor unit doesn't times times does not match can’t work match - During cooling and drying operation, compressor will stop while indoor fan will Failure Blinks 11 Refer to the...

  • Page 21: How To Check Simply The Main Parts

    8.4. How to check simply the main part 8.4.1 Indoor Unit: 8.4.1.1 Temperature sensor malfunction (F1/F2) F1 and F2 malfunction Is the wiring terminal between temp. sensor and the controller loosened or poorly contacted? Insert the temperature sensor tightly Malfunction is eliminated Is there short circuit due to trip over of the parts? Make the parts upright...
  • Page 22 8.4.1.2 Indoor fan does not operate (H6 Malfunction) Possible causes: 1. Fan motor is locked; 2. The feedback terminal of PG motor is not connected tightly; 3. The control terminal of PG motor is not connected tightly; 4. Motor is damaged; 5.
  • Page 23 8.4.1.3. Jumper cap malfunction (C5) Possible causes: 1. There is no jumper cap on the controller; 2. Jumper cap is not inserted properly and tightly; 3. Jumper cap is damaged; 4. Controller is damaged. See the flow chart below: C5 is displayed on the unit. Is there jumper cap on the mainbaord? Install a matching jumper cap.
  • Page 24 8.4.1.4 Communication Malfunction (E6) 1. Check if connection wire between indoor and outdoor units and wire inside the unit are connected well. 2. Check if mainboard of indoor or outdoor unit is damaged. Communication malfunction of indoor unit Power off the unit and check if the connecting wire of indoor and outdoor unit and wiring of electric box are correct.
  • Page 25 8.4.2 Outdoor Unit: 8.4.2.1 Key detection points Test3 Test4 Test1 Test5 Test2 Test8 Test9 Test7 Test6 Test point SN Test point Related specification Test value in normal condition Test 1 Between AC-L1 and N1 Neutral and live wire 165V ~ 253V Test 2 Left side of R201, radiator U404 DC bus bar...
  • Page 26 8.4.2.2. Capacitor charging malfunction (Fault with outdoor unit) (AP1 below refers to the outdoor control panel) Main detection point: • Use AC voltmeter to check if the voltage between terminal L and N on the wiring board is within 210VAC ~ 240VAC. •...
  • Page 27 • If the working loads of the machine are too hight? If the radiation is good? • If the charge volume of refrigerant is correct? Fault diagnosis process: Energize and switch on Use AC voltmeter to If the voltage between terminal Check supply IPM Protection occurs...
  • Page 28 8.4.2.4. High temperature and overload protection diagnosis (AP1 herinafter refers to control board of the outdoor unit) Main detection point: ● Is outdoor ambient temperature in normal range? ● Are the outdoor and indoor fans operating normally? ● Is the heat dissipation environment inside and ouside the unit is good? Overheat and high temperature protection Normal protection, please operate Is outdoor ambient temperature higher than 53°C?
  • Page 29 8.4.2.6 Diagnosis for compressor Out of step (synchronism)(AP1 hereinafter refers to control board of the outdoor unit) Main detection point: ● Whether the unit voltage is too high? ● Whether the work voltage is too low? Out of step (synchronism) occurred during operation Out of step occurs once the unit is powerd on Check if the fan Replace the...
  • Page 30 8.4.2.8 Power factor correction (PFC) fault (a fault of outdoor unit) (AP1 hereinafter refers to the control board of the outdoor unit) Main detection point: ● Check if the reactor (L) of the outdoor unit and the PFC capacitor are broken? The failure diagnosis is as follows: Start Check wiring of the reactor (L)
  • Page 31 8.4.2.9 Communication malfunction (following AP1 for outdoor unit control board) Main detection point: ● Detect the indoor and outdoor units connection wire and indoor and outdoor units inside wiring is connect well or not, if is there any damage? ● Is there any damage for the indoor unit mainboard communication circuit? Is communication circuit damaged? The flow chart for the malfunction detect: Start Check the wiring of the...

  • Page 32: Appendix 1: Form For Indoor/Outdoor Unit's Ambient Sensor Numerical Value Of Resistance

    Appendix 1: Resistance table for indoor/outdoor ambient temperature sensors (numerical value of resistance) (15K) Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) 138.100 18.750 3.848 1.071 128.600 17.930 3.711 1.039 121.600 17.140 3.579 1.009 115.000...

  • Page 33: Appendix 2: Form For Indoor/Outdoor Unit's Tube Temperature Sensor Numerical Value Of Resistance

    Appendix 2: Resistance table for indoor/outdoor tube temperature sensor (20K) Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) 181.400 25.010 5.130 1.427 171.400 23.900 4.948 1.386 162.100 22.850 4.773 1.346 153.300 21.850 4.605 1.307 145.000...

  • Page 34: Appendix 3: Form For Indoor/Outdoor Unit's Air Exhaust Temperature Sensor Numerical Value Of Resistance

    Appendix 3: form for indoor/outdoor unit’s air exhaust temperature sensor numerical value of resistance Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) Temp. (°C) Resistance (kΩ) 853.500 98.000 18.340 4.754 799.800 93.420 17.650 4.609 750.000 89.070 16.990 4.469 703.800...
  • Page 36 Via Gettuglio Mansoldo (Loc. La Macia) 37040 Arcole Verona, Italy Tel. +39 - 045.76.36.585 r.a. Fax +39 - 045.76.36.551 r.a. www.maxa.it e-mail: maxa@maxa.it...

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Bds35a

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