1 VRF Refrigerant Circuit System采用midea通用PPT模版, 参考《公司简介》PPT
2 Contents Internal structure System Principles Key Parts Key Functions
3 Internal structure 1.1 8/10HP unit Mesh enclosure Side cover Fan leafDC motor Electric control box Heat exchanger Fixed compressor DC compressor
4 (12HP has only 1 fixed compressor)Internal structure /14/16HP unit Mesh enclosure Fan leaf DC motor Side cover Electric control box Heat exchanger Fixed compressors (12HP has only 1 fixed compressor) DC compressor
5 Internal structure 1.3 18/10/12HP unit (2 compressors) Oil separatorGas-liquid separator EXV Fixed compressor Filter DC compressor
6 Internal structure 1.4 14/16HP unit (3 compressors) Oil separatorGas-liquid separator Filter EXV Fixed compressors DC compressor
7 Internal structure 1.5 Indoor units Remark:Liquid pipe Gas pipe Drainage pipe EXV box EXV connection pipe Remark: EXV box is already installed on the indoor unit, only connection pipe need installing.
8 Internal structure 1.5 Indoor units Remark:Liquid pipe Gas pipe Drainage pipe EXV box EXV connection pipe Remark: EXV box is already installed on the indoor unit, only connection pipe need installing.
9 Internal structure 1.5 Indoor units Remark:Liquid pipe EXV box EXV connection pipe Gas pipe Drainage pipe Remark: EXV box is already installed on the indoor unit, only connection pipe need installing.
10 Internal structure 1.5 Indoor units Remark:Gas pipe Liquid pipe EXV Remark: EXV box is already installed on the indoor unit, only connection pipe need installing.
11 Internal structure 1.5 Indoor units Remark:Gas pipe Drainage pipe Liquid pipe EXV box EXV connection pipe Remark: EXV box is already installed on the indoor unit, only connection pipe need installing.
12 Internal structure 1.5 Indoor units Remark:Gas pipe EXV box Liquid pipe Remark: EXV box is already installed on the indoor unit, only connection pipe need installing.
13 Internal structure 1.5 Indoor units Remark:EXV Gas pipe Liquid pipe Remark: EXV box is already installed on the indoor unit, only connection pipe need installing.
14 System Principles 2.1 System principle diagram Liquid side Gas sideOil separator Check port Oil balance Gas-liquid separator
15 System Principles 2.2 Cooling circuit Liquid side Gas side Check portOil balance
16 System Principles 2.3 Heating circuit Liquid side Gas side Check portOil balance
17 Key Parts Gas-liquid separator Filter Fixed comp. DC inverter comp.Oil separator
18 Key Parts 3.1 Compressor Discharge pipe Suction pipe Oil even pipe
19 DC inverter compressorKey Parts 3.1 Compressor Capacity 8HP 10HP 12HP 14HP 16HP DC inverter compressor Model E405DHD-36D2YG 1 Displacement 36cm3/rev Operation frequency 24～90Hz Fix speed compressor E505DH-49D2YG / 49cm3/rev 50Hz E605DHD-59D2YG 2 59cm3/rev E655DHD-65D2YG 65cm3/rev Total quantity
20 Key Parts 3.1 Condenser Air outlet Air inlet Air inlet Capacity 8HPType Copper & fin Copper pipe size (mm) Ø7.94 Copper pipe type Inner screw Fin type Window type Height (mm) 1232 Rows 2 Fan & motor Fan Axial /1 set Axial /2 sets Motor DC / 1 set DC / 2 sets Air flow (m3/h) 12000 15000
21 Key Parts 3.2 Oil separator (centrifugal type)Oil Separator is used to separate oil from high pressure & temperature gas refrigerant that is pumped out from compressor. The separation efficiency is up to 92%, it makes the oil return back to each compressor very soon. Has an oil balance pipe. Outlet Inlet Oil balance Oil return
22 Key Parts 3.3 Gas-liquid separatorIt is used to store the liquid refrigerant and oil, it can protect the compressor from liquid hammer. OUT IN OUT IN
23 Key Parts Filter
24 Key Parts SV2 SV4 High pressure sensor SV6 High pressure switch4-way valve (ST1) Low pressure switch
25 Key Parts 3.5 DC Fan motor Multi-step fan speed control. Adjust the fan speed according to the hi pressure and ambient temp. When pressure increase, fan speed increase. Capacity Motor model Fan size quantity 8HP 10HP DR Φ700*202 1 12HP 14HP 16HP Φ560*195 2
26 Key Parts 3.6 Hi pressure sensorTo supervisor the discharge pressure of the compressor and to control the fan speed. Every 20 seconds, compare the system pressure and the best pressure to adjust DC fan motor speed timely. Always test the system pressure
27 Key Parts 3.6 High pressure sensorWhen discharge pressure is too high, DC inverter compressor’s frequency will be decreased. When discharge pressure is bigger than 4.4MPa, system stops and displays error code.
28 Key Parts 2.7 SV2 SV2: Spray liquid refrigerant to cool down compressor It is used to regulate the discharge temperature, when the discharge temperature is higher than 105℃, SV2 opens immediately.
29 Key Parts 2.8 SV4 SV4: Oil balance valve.Opens after the DC inverter compressor has been run for 5 minutes and then closes 15 minutes later. (For the system has only one outdoor unit) Each 17 minutes, SV4 of each outdoor unit opens for 3 minutes. (For the system has more than one outdoor units)
30 Key Parts 2.9 ST1 It closes when system is in cooling mode. It opens when the system is in heating mode.
31 Key Parts SV6 EXV-A
32 Key Parts 2.10 SV6 SV6 is used for protecting the compressors.When cooling mode, it will open for 5 minutes. It opens when the compressors discharge temp. is over-high. Closes when the unit is standby or system is in heating mode.
33 Key Parts 2.11 EXV EXV: 8/10/12HP have single EXV, 14/16HP have double EXVs When the outdoor unit is power on, the EXVs firstly close with 700 pulse, then they open with 350 pulse and then standby. Open to the target pulse after the compressor start up.
34 Key Parts 2.11 EXV Saginomiya brand Screw Magnetic coil
35 Key Parts SV5
36 Key Parts 2.13 SV5 In defrosting mode, SV5 is open to make the defrosting process more quickly. In cooling mode, it is always off.
37 Key Functions 3.1 Oil return programWhen system start up for 140 minutes, oil return program will run. After that, every 8 hours continued operating this program will run. The program will last for 3 minutes. All the outdoor EXV open to 480 pulse and SV6 is on. Action of indoor Fan and EXV. Running IDU Stop or stand by IDU Fan only IDU Cooling mode EXV Keep degree unchanged 300 pulse 300pulse Fan Keep on Keep off Heating mode / Anti-cold wind
38 Key Functions 3.2 System pressure precisely controlSystem pressure precisely control according to the high-accuracy pressure switch, in all condition, system will maintain in the best working status. Every 20s, system will detect the system pressure to compare the best pressure value of the system, and then adjust the DC fan motor running speed accordingly to make the system running in a high efficiency status.
39 Key Functions 3.3 Outdoor fan ESP settingThanks to DC fan motor, Outdoor fan static pressure can be set by switch on outdoor PCB. Maximum ESP 85Pa.
40 Key Functions 3.4 All outdoor units cycle operationBalance the lifespan among outdoor units in one system. In cooling mode, outdoor units will change the start order when 1) room temperature gets to the setting temperature or 2) after oil return program. In heating mode, outdoor units will change the start order when 1) room temperature gets to the setting temperature or 2) after oil return program or 3) after defrost program.
41 Ambient temperature curveKey Functions 3.5 Silent mode, night time noise control System will lower the fan speed in the night time to reduce the noise. 8:00 16:00 0:00 50 60 100 Capacity output % Noise dB Ambient temperature curve 8hours 10hours you can choose by s2 switch, when the system will enter silence mode and the period of silence operation by the switch. The first digit stands for when the system will enter silence, the second digit stands for the Period of silence operation Silent mode Max. 10dB(A) decrease Start Stop
42 Key Functions 3.6 Addressing methods 2 addressing methods:Automatically addressing: system will distribute address to indoor unit automatically Manually setting by wireless remote controller Addressing method can be selected easily by adjusting the switch on outdoor PCB. 42
43 Key Functions 3.7 Mode restriction 5 kinds of mode restrictionFirst start indoor units priority mode Cooling (or heating)priority mode Cooling only (or heating only) mode Mode restriction function can be selected on the outdoor PCB. V4+ can execute mode lock function , has several kinds of mode lock avoide the mode conflict Heating priority (Default setting) Cooling priority First-start priority Heating only Cooling only
44 Key Functions 3.8 Anti-snow FunctionIn the cold weather, outdoor fan will start to run for a while at intervals, for preventing the snow to accumulate on fan blade. Because accumulated snow will freeze and block fan blade rotating, even worse it will damage the motor. It only start when temperature is lower than 0˚C. V4+ can execute mode lock function , has several kinds of mode lock avoide the mode conflict
45 Key Functions 3.9 Pressure protectionHigh pressure switch is installed in the compressor discharge pipe, it is always on, if pressure is higher than 4.4MPa, it turns off to switch off the system, auto recover when pressure is lower than 3.0MPa and system has stop for 3 minutes. Low pressure switch is installed in the compressor suction pipe, it is always off, if pressure is lower than 0.05MPa, it turns on to switch off the system, auto recover when pressure is bigger than 1.5MPa and system has stop for 3 minutes. If protection is occurred, system will restart in 3 minutes If protection is occurred twice in 30minutes, P2 code will displayed on the outdoor PCB, it can’t be recovered unless re-power-on the system.
46 Key Functions 3.9 Other protection Discharge temperature protection:When Discharge temperature >120˚C, system stops, auto recover when pressure is bigger than 1.5MPa and system has stop for 3 minutes. Current protection When inverter compressor’s current >12A or fixed compressor’s current >19A , system stops. Communication failure, system stops. Sensor malfunction, system stops.
47 Thank you!!