Contents. Introduction Part 1 General Information Part 2 General Instruction Part 3 Outdoor Units Part 4 Installation...

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1 MHVAC-DTSM Contents Contents Introduction... 1 Part 1 General Information... 2 Part 2 General Instruction Part 3 Outdoor Units Part 4 Installation Part 5 Control System The specifications, designs, and information in this book are subject to change without notice for product improvement. Contents

3 MHVAC-DTSM Introduction Introduction The MDV-D (Digital Scroll Air Conditioner) air conditioning system is operated by a variable-capacity compressor and is accommodated by multiple evaporators (indoor units). It is considered as the next-generation modular system with high efficiency air conditioning in the world. It has undoubtedly changed the face of cooling associated with high-storied buildings. It provides a broad range of different applications for settings such as offices, hotels and schools. With the advantage of easy installation and simple controlling system and so on, the MDV-D system can meet the demands of the air conditioning market better. Introduction 1

4 General Information MHVAC-DTSM Part1 General Information 1. Model Names of Indoor/Outdoor Units External Appearance Combination of Outdoor Units Nomenclature Features General Information

5 MHVAC-DTSM Model Names of Indoor/Outdoor Units Model Names of Indoor/Outdoor Units Indoor Units Type Compact Fourway Cassette Four- way Cassette (New Designed) Low Static Pressure Duct Medium Static Pressure Duct Model Name ( MDV-D) 22Q4/CN1 28Q4/CN1 36Q4/CN1 45Q4/BN1 56Q4/BN1 28Q4/N1-C 36Q4/N1-C 45Q4/N1-C 56Q4/N1-C 71Q4/N1-C 80Q4/N1-C 90Q4/N1-C 100Q4/N1-C 112Q4/N1-C 140Q4/N1-C 18T3/N1-A 22T3/N1-A 28T3/N1-A 36T3/N1-A 45T3/N1-A 56T3/N1-A 45T2/CN1 56T2/CN1 71T2/CN1 80T2/CN1 90T2/CN1 112T2/CN1 140T2/CN1 Medium Static Pressure Duct A5 Type 10HP High Static Pressure Duct 45T2/N1-A5 56T2/N1-A5 71T2/N1-A5 80T2/N1-A5 90T2/N1-A5 112T2/N1-A5 140T2/N1-A5 200T1/N1 250T1/N1 280T1/N1 Ceiling & Floor 36DL/N1-B 45DL/N1-B 56DL/N1-B 71DL/N1-B 80DL/N1-B 90DL/N1-B 112DL/N1-B 140DL/N1-B Wall-mounted (E1/E7 Type) Wall-mounted (EXV Integrated) Concealed Floor-standing Exposed Floor-standing 22G/N1-E1 28G/N1-E1 36G/N1-E1 45G/N1-E1 56G/N1-E1 22G/(D)N1Y 28G/(D)N1Y 36G/(D)N1Y 45G/(D)N1Y 56G/(D)N1Y 22Z/N1-F3 28Z/N1-F3 36Z/N1-F3 45Z/N1-F3 56Z/N1-F3 71Z/N1-F3 80Z/N1-F3 22Z/N1-F1/F 2 28Z/N1-F1/F 2 36Z/N1-F1/F 2 45Z/N1-F1/F 2 56Z/N1-F1/F 2 71Z/N1-F1/F 2 80Z/N1-F1/F 2 Console 22Z/DN1-A 28Z/DN1-A 36Z/DN1-A 45Z/DN1-A Power supply of all the indoor units is 1 phase, V, 50Hz Outdoor Units Capacity (HP) Refrigerant Model Capacity (HP) Refrigerant Model 8 R410A MDV-D252W/SN1 38 R410A MDV-D1065W/SN1 10 R410A MDV-D280W/SN1 40 R410A MDV-D1130W/SN1 12 R410A MDV-D335W/SN1 42 R410A MDV-D1180W/SN1 14 R410A MDV-D400W/SN1 44 R410A MDV-D1235W/SN1 16 R410A MDV-D450W/SN1 46 R410A MDV-D1300W/SN1 18 R410A MDV-D532W/SN1 48 R410A MDV-D1350W/SN1 20 R410A MDV-D560W/SN1 50 R410A MDV-D1432W/SN1 22 R410A MDV-D615W/SN1 52 R410A MDV-D1460W/SN1 24 R410A MDV-D680W/SN1 54 R410A MDV-D1515W/SN1 26 R410A MDV-D730W/SN1 56 R410A MDV-D1580W/SN1 28 R410A MDV-D785W/SN1 58 R410A MDV-D1630W/SN1 30 R410A MDV-D850W/SN1 60 R410A MDV-D1685W/SN1 32 R410A MDV-D900W/SN1 62 R410A MDV-D1750W/SN1 34 R410A MDV-D960W/SN1 64 R410A MDV-D1800W/SN1 36 R410A MDV-D1010W/SN1 Power supply of all the outdoor units is 3 phase, 380~415V, 50Hz General Information 3

6 External Apperance 2. External Appearance MHVAC-DTSM , 10, 12HP 14,16 HP 18, 20, 22, 24, 26, 28, 30, 32 HP 34, 36, 38, 40, 42, 44, 46, 48 HP 50, 52, 54, 56, 58, 60, 62, 64 HP 4 General Information

7 MHVAC-DTSM Combination of Outdoor Units Combination of Outdoor Units Capacity (HP) Model Recommend combination 8(HP) 10(HP) 12(HP) 14(HP) 16(HP) Max. connection indoor units 8 MDV-D252W/SN MDV-D280W/SN MDV-D335W/SN MDV-D400W/SN MDV-D450W/SN MDV-D532W/SN MDV-D560W/SN MDV-D615W/SN MDV-D680W/SN MDV-D730W/SN MDV-D785W/SN MDV-D850W/SN MDV-D900W/SN MDV-D960W/SN MDV-D1010W/SN MDV-D1065W/SN MDV-D1130W/SN MDV-D1180W/SN MDV-D1235W/SN MDV-D1300W/SN MDV-D1350W/SN MDV-D1432W/SN MDV-D1460W/SN MDV-D1515W/SN MDV-D1580W/SN MDV-D1630W/SN MDV-D1685W/SN MDV-D1750W/SN MDV-D1800W/SN1 64 Caution: The system enables the connection of indoor units with a total capacity within 50% to 130% of that of the corresponding outdoor unit, but when this capacity ratio exceeds 100% then the actual capacity of each indoor unit will decrease compared to rated capacity when all the units operated simultaneously. General Information 5

8 Nomenclature 4. Nomenclature MHVAC-DTSM MDV- D 252 W / SN1 Refrigerant N1:R410A Power Supply S: 380~415V~,50Hz,3ph W: Outdoor Unit Cooling Capacity( 100W) Digital Sccroll A/C System Multi-Digital-Variable 6 General Information

2 Principle of the digital scroll compressor: 5.1.1 Composition The solenoid valve is installed for the compressor s loading/ unloading between the upper part of the fixed scroll and the suction pipe.

9 MHVAC-DTSM Features 5.1 Variable-capacity compressor Features The world s first PWM (Pulse Width Modulation) compressor controls the cooling and heating capacity automatically according to the load. 5.2 Principle of the digital scroll compressor: Composition The solenoid valve is installed for the compressor s loading/ unloading between the upper part of the fixed scroll and the suction pipe Mechanism a. When the solenoid valve is turned off, the fixed scroll is close to the orbiting (Loading). b. When the solenoid valve is turned on, the fixed scroll is separated from the orbiting scroll. (Unloading). c. This process controls the On / Off time of the valve and the rotating refrigerants in the circle thus adjusting the capacity. d. The cooling capacity of the outdoor units is adjusted automatically, according to the number of operating indoor unit(s). General Information 7

3 PWM (Pulse Width Modulation) Valve PWM valve is the valve to take away the fixed scroll by lifting up through the difference of pressure after the digital scroll compressor being connected to the

Therefore, the capacity of compressor is controlled automatically according to the operation status such as loading when the valve is closed or unloading when the valve is opened.

10 Features MHVAC-DTSM PWM (Pulse Width Modulation) Valve PWM valve is the valve to take away the fixed scroll by lifting up through the difference of pressure after the digital scroll compressor being connected to the outlet and inlet of suction. Therefore, the capacity of compressor is controlled automatically according to the operation status such as loading when the valve is closed or unloading when the valve is opened. PWM means the ON/OFF signal to the valve for loading /unloading. 5.3 High efficiency 5.4 Long & single piping system Digital scroll system is the only system that is free of oil separator and oil recycling equipment. In the loading state, the speed of the refrigerant is enough to move oil back to the compressor. The max. pipe length between indoor unit and outdoor unit is 175m. The max. height difference between indoor unit and outdoor unit is 70m. The max. distance between the first branch to the farthest indoor unit is 40m. The max. height difference between indoor units is 15m. 5.5 Free combination, wide capacity range 5 basic modules, which can be freely assembled. 2HP increments of capacity range, which meets customer s needs accurately. Maximum capacity is 64HP, the maximum capacity in air-conditioner refrigeration industry. 8 General Information

compressors, which balancing the gas suction volume among different compressors. 5.

decrease fan noise and boost fan efficiency.

to lower pressure. Adopt dual turbofan which makes bigger airflow volume with lower noise. 5.

heat-exchanger, which creates higher heat exchange efficiency and powerful heating capacity

11 MHVAC-DTSM Features 5.6 Patented design, running reliable Gas balance MDV-D adopts unique gas balance device among compressors, which balancing the gas suction volume among different compressors. 5.7 High air volume & low noise New designed inner hidden duct circle improve outlet air field decrease fan noise and boost fan efficiency. The grille of fan air inlet and fan air outlet has airflow direction adjusting function, which leads to lower pressure. Adopt dual turbofan which makes bigger airflow volume with lower noise. 5.8 High efficient heat-exchanger & precisely refrigerant control Adopt inner-screw copper heat-exchanger, which creates higher heat exchange efficiency and powerful heating capacity especially in low ambient temperature. Outdoor heat-exchange area can be adjusted by running load. MDV-D adopts dual EXV,which achieves up to 960 steps refrigerant adjusting precision to insure precise control of refrigerant and raise system circulation efficiency. General Information 9

Features 5.9 Patented double four way valve design.

And according to the load adjust the heat exchange volume of outdoor unit accurately and prevent wasting the capacity in part load time. Main Four Way Valve Auxiliary Four Way Valve 5.

Indoor units installation: each series of indoor units have the same pipe dimension, and all the pipes are connected by flare nut, so it is easy to connect and decrease your installation cost up to

12 Features 5.9 Patented double four way valve design. MHVAC-DTSM The combination of one main and one auxiliary four way valve can control the outdoor heat exchanger and outdoor air flow independently. And according to the load adjust the heat exchange volume of outdoor unit accurately and prevent wasting the capacity in part load time. Main Four Way Valve Auxiliary Four Way Valve 5.10 Space saving 5.11 Simple installation and easy maintenance Easy installation The structure of the MDV-D system and the piping work are simple, thus the installation is easy. Indoor units installation: each series of indoor units have the same pipe dimension, and all the pipes are connected by flare nut, so it is easy to connect and decrease your installation cost up to 30% Independent system The MDV-D system can be installed by stages and the owners can install their system at their convenient time. Thus the system has less installation time limit. Installation by stages can avoid the noninstallment for the new project Convenient installation is realized for the rebuilt project No need special maintenance work Simple refrigerant piping system without any complicated maintenance work Compared with the water-cooled system: Without water-cooled system, there is no need to clean the water pipe No full-time person is needed to do the maintenance work Module construction enables the system to be free from large-scale repair regularly 10 General Information

MHVAC-DTSM-2012-07 5.12 Flexible control system Features Individual control, group control, network control are all available.

16 indoor CCM and monitor 16 outdoor CCM; 1 indoor CCM can max control 64 indoor units; 1 outdoor CCM can max monitor 32 outdoor units; So 1 Computer can control max 1024 indoor units and

13 MHVAC-DTSM Flexible control system Features Individual control, group control, network control are all available. The Midea 3 rd generation network control system can realize intelligent management to the A/C system, it adopts Lonworks protocol and can be connected to the BMS: 1 computer can control max 16 indoor CCM and monitor 16 outdoor CCM; 1 indoor CCM can max control 64 indoor units; 1 outdoor CCM can max monitor 32 outdoor units; So 1 Computer can control max 1024 indoor units and monitor 512 outdoor units Healthy and more comfortable Accurate temperature control Adopting high speed DSP processing chip and stepless control to insure small temperature fluctuate. Temperature fluctuate is as small as ±0.5. General Information 11

The lowest heating temperature can reach -15. The highest cooling temperature can reach +48. 5.13.

14 Features Wide operating range MHVAC-DTSM MDV-D is cooling and heating type system operating range is broaden by use of digital technology. The lowest heating temperature can reach -15. The highest cooling temperature can reach Low electromagnetic disturbance MDV Digital Scroll System causes low electromagnetic disturbance, since the loading and unloading of compressor are merely mechanical movement. This special feature makes the Digital Scroll System applicable to telecommunication companies, power stations, and all kinds of precise science labs. 12 General Information

15 MHVAC-DTSM General Instruction Part 2 General Instruction 1. General Instruction Example (Based on Cooling Load) General Instruction 13

16 General Instruction 1. General Instruction MHVAC-DTSM Indoor Unit Selection Enter INDOOR UNIT CAPACITY TABLES at given indoor and outdoor temperature. Select the unit that the capacity is the nearest to and greater than given load. Note:Individual indoor unit capacity is subject to change by the combination. Actual capacity has to be calculated according to the combination by using outdoor unit capacity table. 1.2 Outdoor Unit Selection Allowable combinations are indicated in INDOOR UNIT COMBINATION TOTAL CAPACITY INDEX TABLE. In general, outdoor unit can be selected as follows though the location of the unit, zoning and usage of the rooms may be considered. The indoor and outdoor unit combination is determined that the sum of indoor unit capacity index is nearest to and smaller than the capacity index at 100% combination ratio of each outdoor unit. Up to 8~16 indoor units can be connected to one outdoor unit. It is recommended to choose a larger outdoor unit if the installation space is large enough. If the combination ratio is greater than 100%, the indoor unit selection shall be reviewed by using actual capacity of each indoor unit. INDOOR UNIT COMBINATION TOTAL CAPACITY INDEX TABLE Outdoor Unit Indoor Unit Combination Ratio (kw) 130% 120% 110% 100% 90% 80% 70% 60% 50% 8HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP HP General Instruction

17 MHVAC-DTSM INDOOR UNIT CAPACITY INDEX General Instruction Model Model Model Model Model Model Model Model Model Model Model Unit Size Capacity Index (kw) Actual Performance Date Use OUTDOOR UNIT CAPACITY TABLES. Determine correct table according to the outdoor unit model and combination ratio. Enter the table at given indoor and outdoor temperature and find the outdoor unit capacity and power input. The individual indoor unit capacity (power input) can by calculated as follows. IUC=OUC INX/TNX Where, IUC: Each indoor unit capacity OUC: Outdoors unit capacity INX: Each indoor unit capacity index TNX: Total capacity index Then, correct the indoor unit capacity according to the piping length. If the corrected capacity is smaller than the load, the size of indoor unit has to be increased and repeat the same selection procedure. 1.4 Variation in capacity in accordance with the length of refrigerant pipe Cooling capacity modification Modification coefficient of the length and high difference of refrigerant pipe: H (m) % L: Refrigerant pipe equivalent length H: Height difference between outdoor and indoor Heating capacity modification Modification coefficient of the length and high difference of refrigerant pipe: H (m) % L (m) L(m) L: Refrigerant pipe equivalent length H: Height difference between outdoor and indoor General Instruction 15

18 Example (Based on Cooling Load) 2. Example (Based on Cooling Load) MHVAC-DTSM Given condition Design condition (Cooling: Indoor 20 C (WB), Outdoor 35 C (DB)) Cooling load Location Room A Room B Room C Room D Room E Room F Load (kw) Power supply unit: Outdoor 380V-3Ph-50Hz, Indoor 220~240V-1Ph-50Hz Pipe length: 50m Height difference: 30m 2.2 Indoor unit selection Select the suitable capacity for condition of Indoor 20 C (WB), Outdoor 35 C (DB) using indoor unit capacity table. The selected result is as follows. (Assuming the indoor unit type is duct) Location Room A Room B Room C Room D Room E Room F Load (kw) Unit size Capacity (kw) Outdoor unit selection Assume the indoor unit and outdoor unit combination as follows Calculate the total nominal capacity of indoor units in the combination according to the above table: = 25.8kW Select outdoor unit: MDV-D280W/SN1 which has nominal cooling capacity: 28kW. Calculate the proportion between and : 258/280= 92% Result : Because the proportion is within %, it is a Right selection Real function data with indoor unit combination For the 92% combination, calculate the cooling capacity of outdoor unit (MDV-D280W/SN1) kW 90% (Indoor temperature : WB 20 C, Outdoor temperature: DB 35 C) 28.30kW 100%(Indoor temperature : WB 20 C, Outdoor temperature: DB 35 C) Then calculated the outdoor capacity in 92% combination index: Therefore: {( )/ 10} 2= 27.04; Outdoor unit (MDV-D280W/SN1) cooling temperature: DB 35 C Capacity modification coefficient with pipe length (50m) and height difference (30m): Each indoor unit cooling capacity MDV-D22T2: / = 2.21(kW) MDV-D28T2: / = 2.81 (kw) MDV-D36T2: / = 3.61 (kw) MDV-D45T2: / = 4.52 (kw) MDV-D56T2: / = 5.62 (kw) MDV-D71T2: / = 7.13 (kw) Location Room A Room B Room C Room D Room E Room F Load (kw) Unit size Capacity (kw) Conclusion: Generally, we think this result is acceptable, so we can think we have accomplished the calculation. But if you think this result is not acceptable, you can repeat the above process. Remark: In this sample, we don t consider the other capacity modification index and assume them is General Instruction

19 MHVAC-DTSM Outdoor Units Part 3 Outdoor Units 1. Specifications Dimensions Service Space Piping Diagrams Wiring Diagrams Functional Parts and Safety Devices Capacity Tables Operation Limits Sound Levels Exploded View Troubleshooting Accessories Outdoor Units 17

20 Specifications 1. Specifications MHVAC-DTSM Sale Model MDV-D252W/SN1 MDV-D280W/SN1 MDV-D335W/SN1 Power supply V-Ph-Hz 380~ ~ ~ Cooling Capacity kw Input kw Heating Capacity kw Input kw Max. input consumption kw Max. current A Model ZPD72KCE-TFD-433 ZPD72KCE-TFD-433 ZPD72KCE-TFD-433 Type & Brand Digital Scroll / Copeland Compressor Capacity Btu/h Locked rotor Amp(LRA) A Thermal protector Innner Innner Innner Refrigerant oil ml Model ZP57K3E-TFD-422 ZP57K3E-TFD-422 ZP67KCE-TFD-420 Type & Brand Scroll / Copeland Scroll / Copeland Scroll / Copeland Compressor Capacity Btu/h Locked rotor Amp(LRA) A Thermal protector Innner Innner Innner Refrigerant oil ml Model YDK400-8A YDK400-8A YDK400-8A Type AC Motor AC Motor AC Motor Brand Yongan Yongan Yongan Insulation class F F F Outdoor fan Safe class IP44 IP44 IP44 motor Input W 647/ / /460 Output W Rated current A Capacitor uf Speed r/min 670/ / /540 Number of rows Tube pitch(a)x row pitch(b) mm Fin spacing mm Fin type (code) Hydrophilic aluminium Hydrophilic aluminium Hydrophilic aluminium Outdoor coil Ф9.5 Ф9.5 Ф9.5 Tube outside dia. and type mm Innergroove tube Innergroove tube Innergroove tube Coil length x height mm Number of circuits Outdoor air flow m 3 /h Outdoor sound level(sound pressure level ) db(a) Dimension(W H D) mm Outdoor unit Packing (W H D) mm Net/Gross weight kg 290/ / /309 Charged refrigerant type g R410A/11000 R410A/11000 R410A/11000 Throttle type Electric Expansive Valve (VPF-32D23) Design pressure MPa 4.2/ / /2.0 Refrigerant piping Liquid side/ Gas side mm Ф12.7/Ф25.4 Ф12.7/Ф25.4 Ф12.7/Ф25.4 Gas balance pipe m Ф19.1 Ф19.1 Ф19.1 Max. refrigerant pipe length m Max. difference between m indoor Max. units difference between outdoor unit and indoor unit m Ambient temp. Cooling:-5-48 ; Heating: Outdoor Units

21 MHVAC-DTSM Specifications Sale Model MDV-D400W/SN1 MDV-D450W/SN1 Power supply V-Ph-Hz 380~ ~ Cooling Capacity kw Input kw Heating Capacity kw Input kw Max. input consumption kw Max. current A Model ZPD72KCE-TFD-433 ZPD72KCE-TFD-433 Type & Brand Digital Scroll / Copeland Digital Scroll / Copeland Compressor Capacity Btu/h Locked rotor Amp(LRA) A Thermal protector Innner Innner Refrigerant oil ml Model ZP67KCE-TFD-420( 2) ZP67KCE-TFD-420( 2) Type & Brand Scroll / Copeland Scroll / Copeland Compressor Capacity Btu/h Locked rotor Amp(LRA) A Thermal protector Innner Innner Refrigerant oil ml Outdoor fan motor Outdoor coil Model YDK450-6A( 2) YDK450-6A( 2) Type AC Motor AC Motor Brand Welling Welling Insulation class F F Safe class IP44 IP44 Input W 720/ /420 Output W Rated current A Capacitor uf Speed r/min 810/ /530 Number of rows 3 3 Tube pitch(a)x row pitch(b) mm Fin spacing mm Fin type (code) Hydrophilic aluminium Hydrophilic aluminium Tube outside dia. and type mm Ф9.5 Ф9.5 Innergroove tube Innergroove tube Coil length x height mm Number of circuits Outdoor air flow m 3 /h Outdoor sound level(sound pressure level ) db(a) Dimension(W H D) mm Outdoor unit Packing (W H D) mm Net/Gross weight Kg 382/ /400 Charged refrigerant type g R410A/18000 R410A/18000 Throttle type Electric Expansive Valve (VPF-32D23) Design pressure MPa 4.2/ /2.0 Refrigerant piping Liquid side/ Gas side mm Ф15.9/Ф31.8 Ф15.9/Ф31.8 Gas balance pipe m Ф19.1 Ф19.1 Max. refrigerant pipe length m Max. difference between indoor units m Max. difference between outdoor unit and indoor unit m Ambient temp. Cooling:-5-48 ; Heating: Outdoor Units 19

22 Dimensions 2. Dimensions MDV-D252W/SN1 MDV-D280W/SN1 MDV-D335W/SN1 MHVAC-DTSM (Unit: mm) MDV-D400W/SN1 MDV-D450W/SN1 (Unit: mm) 20 Outdoor Units

MHVAC-DTSM-2012-07 Service Space 3. Service Space 3.1 Power supply equipment is preferred to be installed by the side of the outdoor unit. 3.2 Ensure there is sufficient space for the maintenance of the outdoor unit.

23 MHVAC-DTSM Service Space 3. Service Space 3.1 Power supply equipment is preferred to be installed by the side of the outdoor unit. 3.2 Ensure there is sufficient space for the maintenance of the outdoor unit. The modules in the same system must be on the same height. 3.3 Proper space between outdoor units should be kept. 3.4 Distance between ground bolt is shown below: (Note: Outdoor units in the same system should be located in the same level. MDV-D252W/SN1 MDV-D280W/SN1 MDV-D335W/SN1 (Unit: mm) Outdoor Units 21

Service Space MHVAC-DTSM-2012-07 MDV-D400W/SN1 MDV-D450W/SN1 (Unit: mm) 3.

24 Service Space MHVAC-DTSM MDV-D400W/SN1 MDV-D450W/SN1 (Unit: mm) 3.5 Outdoor unit arrangement Outdoor units are higher than the surrounding buildings Outdoor units are aligned in one line Outdoor units are aligned in two lines More than 2 lines of outdoor units 22 Outdoor Units

25 MHVAC-DTSM Outdoor units are lower than the surrounding obstacles Service Space If the outdoor units are lower than the surrounding obstacles, in order to ensure an effective heat exchange a conduit is strongly recommended to help the heat emission and avoid the discharging air being absorbed into the system again. The conduit is made on the installation spot with the height HD=H-h. Note Because the outdoor fan motor has no enough static pressure, the Max. Length should be less than 3meters. 3.7 When there are obstacles above the outdoor unit: Note: If miscellaneous articles are piled around the outdoor unit, such articles must be 800mm below the top of the outdoor unit. Otherwise, a mechanic exhaust device must be added. Outdoor Units 23

26 Piping Diagramse 4. Piping Diagrams 4.1 Refrigerant System Diagram There s no constant speed compressor F2 in the HP system. MHVAC-DTSM Function of key parts ST1: when the operating mode of A/C system changes, turn the flow direction of the refrigerant; ST2: change the heat exchanger area according to the load in cooling mode; EXV: adjust the refrigerant flux; SV1: when there is more than one module in the combination, SV1 is used to cut off the refrigerant flow among modular. If the module is in standby mode, Sv1 will be closed and refrigerant can t enter the module; SV2: cooling down the compressor when the discharge gas temperature of any compressor is more than 100C ; SV3: adjust heat-exchanger area of outdoor when in heating mode; SV5: used when starting heating mode or defrosting mode; SV6: adjust the refrigerant flux in cooling mode. And in heating mode it will be always open 4.3 How to check the valves: a) Electronic Expansion Valve (EXV): when the outdoor unit is power on, the two EXVs firstly close with 700p,then they open with 350p and enter standby mode, two EXVs action is not at the same time. b) Electromagnetic Valve: when the outdoor unit is power on, the SV1 open immediately, so you can check the valve as soon as the outdoor unit is power on; when the compressor starts working in heating mode, the SV3 is open immediately, so you can check the valve as soon as the compressor start; 5 minutes after the outdoor unit start heating mode,sv5 will open; when the compressor starts working in cooling mode, the SV6 open immediately, so you can check the valve as soon as the compressor starts; control the discharge temperature by adjusting the resistance of the temperature sensor, when the discharge temperature is higher than 105 SV2 open immediately. c) Four way valve: when starting heating mode, main four-way valve ST1 turn direction after the compressor has worked for 55s; when the capacity demanded by the indoor unit is less than 12,the auxiliary four-way valve ST2 turn direction. Liquid side Gas side Gas balance D F F Gas balance 24 Outdoor Units

27 MHVAC-DTSM Wiring Diagrams MDV-D252W/SN1 MDV-D280W/SN1 MDV-D335W/SN1 Wiring Diagrams Outdoor Units 25

28 Wiring Diagrams MDV-D400W/SN1 MDV-D450W/SN1 MHVAC-DTSM Outdoor Units

29 MHVAC-DTSM Functional Parts and Safety Devices Functional Part and Safety Devices Part Model MDV-D252, 280W/SN1 MDV-D335W/SN1 Compressor Security Devices Temperature sensor Digital Scroll ZPD72KCE-TFD-433 Constant Scroll ZP57K3E-TFD-422 ZP67KCE-TFD-420 Opening temperature 110±5 / 145±5 110±5 / 145±5 Trip current 64A (2~10s) /47 A (2~10s) 64A (2~10s) / 55A ( 2~10s) Crank case heater 70W 2 Outdoor fan motor YDK400-8A Safety thermostat of fan motor On 145±5 Off 95±15 High pressure switch OFF 44kg/cm 2 / ON 32kg/cm 2 Low pressure switch OFF 0.5kg/cm 2 / ON 1.5kg/cm 2 Temperature sensor (condenser outlet) 25 =10KΩ Thermostat (Digital discharge) When Tmax 118 all the compressors are off Part Model MDV-D400,450W/SN1 Compressor Security Devices Temperature sensor Digital Scroll / Constant Scroll Opening temperature Trip current Crank case heater Outdoor fan motor Safety thermostat of fan motor On Off ZPD72KCE-TFD-433 / ZP67KCE-TFD-420 (X2) 110±5 / 145±5 64A (2~10s) / 55A ( 2~10s) 70X3 W YKD450-6A High pressure switch OFF 44kg/cm 2 / ON 32kg/cm 2 Low pressure switch OFF 0.5kg/cm 2 / ON 1.5kg/cm 2 Temperature sensor (condenser outlet) Thermostat (Digital discharge) Thermostat (Fixed discharge) 25 =10KΩ When Tmax 118 all the compressors are off Outdoor Units 27

30 Capacity Tables 7. Capacity Tables 7.1 Cooling Capacity: Cooling Capacity:MDV-D252W/SN1 Combination (Capacity index) 130% 120% Outdoor temperature ( C DB) Indoor temperature( C WB) MHVAC-DTSM TC: total capacity PI: power input TC PI TC PI TC PI TC PI TC PI TC PI TC PI kw kw kw kw kw kw kw kw kw kw kw kw kw kw Outdoor Units

31 MHVAC-DTSM Capacity Tables % % Outdoor Units 29

32 Capacity Tables MHVAC-DTSM % % Outdoor Units

33 MHVAC-DTSM Capacity Tables % % Outdoor Units 31

34 Capacity Tables MHVAC-DTSM % Outdoor Units

35 MHVAC-DTSM Cooling Capacity:MDV-D280W/SN1 Combination (Capacity index) 130% 120% Outdoor temperature ( C DB) Indoor temperature( C WB) Capacity Tables TC: total capacity PI: power input TC PI TC PI TC PI TC PI TC PI TC PI TC PI kw kw kw kw kw kw kw kw kw kw kw kw kw kw Outdoor Units 33

36 Capacity Tables MHVAC-DTSM % % Outdoor Units

Part 1 General Information Part 2 Outdoor Units... 8

Part 1 General Information Part 2 Outdoor Units... 8 Contents Part 1 General Information... 1 Part 2 Outdoor Units... 8 Part 3 Installation... 71 Part 4 Part 5 Trouble shooting 99 Control system. 126 Manufacture reserves the right to discontinue, or change