3. vrf refrigerant cycle ok

8/6/2019 3. VRF Refrigerant Cycle Ok

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Contents ni dung

D3 R410A system h thng D3 R410A

V4 R410A system h thng V4 R410A


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D3 system 1.Internal structure cu toAuxiliary 4-way valve

Van o chiu ph

Oil balance pipe between compressorsng cn bng du gia cc my nn

2 EXVs van tit lu

Gas-liquid separatorBnh tch lng

Gas pipeng thp p

Digital compressorMy nn k thut s

Liquid pipeng cao p

Gas balance pipe 1ng cn bng gas1

Gas balance pipe 2ng cn bng gas2

Constant compressorMy nn c nh

Constant compressorMy nn c nh

Liquid accumulatorBnh cha lng

Outdoor unitMy ngoi

Main 4-way valve

Van o chiu chnh


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D3 system 2.Cooling cycle qu trnh lm lnh

Liquid side

Gas sideng thp p

Gas balance 2Cn bng gas2

Gas balance 1Cn bng gas1

Cooling cycleQu trnh lm lnh

Heat exchanger (Condenser)trao i nhit (dnngng)

Main 4-way valveVan o chiu

chnh


Liquid accumulatorbnh cha lng

OS OS OS

D F1 F2


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Liquid sideng thp p

Gas side

Gas balance 2cn bng gas2


D3 system 3.Heating cycle qu trnh lm nhitHeating cycle

Qu trnh lm nhit

Heat exchanger (Evaporator)trao i nhit(dn ngng)

Main 4-way valveVan o chiu chnh

Gas-liquid separatorbnh tch lng


OS OS OS

D F1 F2


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D3 system 4.Key components thnh phn chnh

From indoor



Gas-liquid separatorbnh tch lng

SV2

SV5

To indoor


SV6 SV1

EXV

Oil separatorsbnh tch du

Compressorsmy nn

SV3

Heat exchangertrao i nhit

ST1 ST2


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D3 system 5.Oil Control iu khin du

Part 1 phn 1

Oil separatorsbnh tch du

Compressorsmy nn


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Oil Separator is used to separate oil from

high pressure & temperature gas refrigerant

that is pumped out from compressor. Bnh

tch du c dng tch lng du

nhit cao v p sut cao c ln vi hi gas

t my nn nn ra .

The separation efficiency is up to 99%, it

makes the oil return back to each compressor

very soon. Hiu qu c tch ln n 99%

,n lm cho lng du v my nn rt sm .

Oil separator

bnh tch duOutlet u ra

Oil return pipe

ng hi du

Inlet u vo


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D3 systemOil separators

tch du

CompressorsMy nn

5.Oil Control iu khin du

High pressure & temperatureliquid

Dch nhit v p sut cao

Low pressure & temperaturegas

Gas p sut v nhit thp

Refrigerant oilgas du

Oil balance between compressorsCn bng du gia cc my nn

Oil separationtch du

Oil balanceCn bngdu

Oil returnHi du

Oil balancecn bng du


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The oil return program starts when the system has continued operating for 4 hours. Chng

trnh hi du bt u khi h thng hot ng c lin tc trong 4 ting .

The program will last for 3 minutes. Chng trnh hi du s t nht l 3 pht

All the outdoor EXV open to 480 pulse and SV6 is on. Tt c van EXV ca my ngoi m 480

v van SV6 l m

Action of indoor Fan and EXV: hnh ng ca qut my trong v EXV

Indoor units that is in standby mode or fan mode:my trong ch ch hay ch qut

Indoor EXV action: Open to 300 pulse Van EXV my trong hnh ng : m 300

Indoor units that is in operating mode: My trong hot ng ch Keep fan speed and EXV open degree unchanged gi tc qut v m van EXV

khng thay i

Indoor fan action: Low speed in cooling, anti-cold air mode in heating mode Hnh

ng qut my trong : tc thp ch lm lnh , chng ch m ch lm nhit

Oil Return program (Auto) chng trnh hi du(t ng)


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SV3

Heat exchangertrao i nhit

ST2ST1

D3 system 6.Heat-exchanger control i u khi ntrao i nhitPart 2 phn 2


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Main 4-way valve (ST1): van o chiu chnh (ST1) :

Use to switch the system to cooling mode or heating

mode. S dng chuyn i h thng qu trnh

lm lnh hay qu trnh lm nhit

D3 system 6.Heat-exchanger control i u khi ntrao i nhit

Auxiliary 4-way valve (ST2): van o chiu ph(ST2):

Use to shut off half of the heat exchanger for the

part load condition. Dng tt mt na dn

trao i nhit cho cc iu kin ti phn

ST1 and ST2


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To indoor unitFrom compressorTo indoor unitti my trong

From compressorT my nn ti

D3 system 6.Heat-exchanger control i u khi ntrao i nhitCooling mode: FULL LOAD condition

Ch lm lnh : iu kin y ti

Refrigerant directionHng mi cht i

4-way valve (ST2) OFFVan o chiu (ST2) tt

Solenoid valve (SV3) OFFVan in t (SV3) tt


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To indoor unitFrom compressor

D3 system 6.Heat-exchanger controlCooling mode: LOW LOAD conditionCh lm lnh : iu kin ti thp

Refrigerant directionhng mi cht i

To indoor unitti my trong

From compressorT my nn ti

In cooling modetrong ch lm lnh

When the indoor unit capacity demand is less than 12, ST2 turns ON to Shut off half of the heat exchanger. Khi m my trong c cng

sut di 12, ST2 m lt tt mt na dn trao i nhit

4-way valve (ST2) ONVan o chiu (ST2) m



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From indoorunit

To compressorFrom indoorunit t my

trong ti

To compressorti my nn

D3 system 6.Heat-exchanger controlHeating mode: FULL LOAD condition

Ch lm nhit : iu kin y ti


4-way valve (ST2) OFFVan o chiu (ST2) tt

Solenoid valve (SV3) ONVan in t(SV3) m

In heating modetrong ch lm nhit

SV3 is open when the average temperature of all indoor coils is less than 46. SV3 c m ra khi nhit trung

bnh ca tt c my trong nh hn 46.


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From indoorunit

To compressorFrom indoorunit t my

trong ti

To compressorTi my nn

D3 system 6.Heat-exchanger control i u khi ntrao i nhitHeating mode: LOW LOAD condition

Ch lm nhit : iu kin ti thp


In heating modetrong ch lm nhitWhen the average temperature of all indoor coils is up to 52, SV3 turns OFF to Shut off half of the heat exchanger. Khi nhit

trung bnh ca tt c cun dy my trong ln n 52th SV3 tt lt tt mt na dn trao i nhit .

4-way valve (ST2) OFFVan o chiu(ST2) tt



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D3 system 7.Refrigerant control


SV6 SV1

EXV

To indoor timy trong

Part 3 phn 3


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D3 system 7.Refrigerant control i u khi n micht lnh

By adopting double outdoor EXVs, the systems refrigerant flow volume can be precisely regulated, and the regulation accuracy

is up to 960 degree. The discharge temperature of compressor can be controlled to maximize the efficiency of the compressor. Bng

vic p dng 2 van EXV vi my ngoi , khi lng lu lng mi cht lnh c khng ch chnh xc ,v c khng ch

chnh xc ln n 960 ,nhit nn ca my nn c th c iu khin ti a ha hiu qu ca my nn

When the outdoor unit is power on, the two EXVs firstly close with 700 pulse, then they open with 350 pulse and then standby,

but two EXVs action are not at the same time. Khi mays ngoi m ngun in th 2 van EXV trc ht ng vi 700 ,sau

chng m 350 v sau ch ,nhng 2 van EXV khng phi hnh ng cng 1 lc

Double EXVs

Double EXVs2 van EXV

Double EXVs 2 van EXV


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D3 system 7.Refrigerant control i u khi n micht lnh

SV6 SV1

SV1: When the outdoor unit is startup, the SV1 opens immediately. When the outdoor unit stops , the SV1

closes immediately. Khi my ngoi khi ng ,van in t SV1 s m ra ngay . Khi my ngoi dng ,van in

t SV1 v ng ngay

SV6 is used for protecting the compressors. SV6 c dng bo v my nn

It opens only when the compressors discharge temperature is over-high. N ch m khi nhit nn

ca my nn l qu cao

Closes when the unit is standby or system is in heating mode. N ng khi h thng ang ch ch

hay ch lm nhit

SV1 and SV6


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It is used to store the overmuch liquid refrigerant. N dng lu tr mi cht c qu lnh thnh

lng .

Comparing with the gas-liquid separator: so snh vi bnh tch lng

Liquid accumulator accumulates unwanted liquid refrigerant. Bnh cha lng cha mi cht

khng mong mun .

Gas-liquid separator is used to store the liquid refrigerant for protecting the compressor from liquid

hammer. Bnh tch lng dng cha cht lng bo v my nn ,khng cho lng trc tip t dn

bay hi a v my nn .

Liquid accumulator bnh cha lng

Liquid accumulator


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SV2

SV5

From indoorT mytrong ti

Gas balance 2Cn bng

gas2

Gas balance 1Cn bng

gas1

Part 4 phn 4


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Connect the gas-liquid separators by a communicating pipe between modules and the pressure of system will help refrigerant

equal distribution, guarantee safety operation. Kt ni bnh tch lng vi 1 ng ng cn bng gas 2 (ni gia bnh tch lng

ca my ny vi bnh tch lng ca my kia.) s gip cn bng mi cht lnh ,m bo an ton hot ng .

It is used to store the liquid refrigerant. N dng lu tr mi cht lnh

From indoor

To compressor

Gas balance pipe 2

Gas-liquid separator

INOUT

Gas-liquid separator bnh tch lng


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From indoor From compressor

To compressor

Gas balance pipe

SV2

SV5

SV5:

It opens after the outdoor unit start heating 5 minutes, for lifting the suction pressure. N m ra sau khi my ngoi khi

ng ch lm nhit 5 pht ,dng tng p sut htIt is used in defrost mode, for making the defrosting process more quickly. N dng trong ch x , n lm cho qu

trnh x nhanh hn

SV2: It is used to regulate the discharge temperature, when the discharge temperature is higher than 105, SV2 opens

immediately. N dng iu tit nhit nn ,khi nhit nn ln cao hn 105,SV2 s m ra ngay

About defrost cycle:v chu k x

It starts when any modules condenser temp.

(T3) < 0, last for 40minutes. N bt u khi c

bt k nhit dn ngng no (T3)


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D3 system 8.Refrigerant balance cn bng gas

Gas balance pipe 1

Cn bng gas1

Gas balance pipe 2Cn bng gas2

Between compressorsNi gia cc my nn vi nhau

Between gas-liquid separatorsNi gia cc bnh tch lng vi

nhau

Gas balance pipe

ng cn bng gas


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V4 R410A systemV4 R410A systemH thng V4 R410AH thng V4 R410A

VRF refrigerant cycle system


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V4 system Difference between V4&D3Khc nhau gia V4&D3D3


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V4 system Difference between V4&D3Khc nhau gia V4&D3

To indoorti my trong

From indoorT my trong

Gas balanceCn bng gas

Oil balanceCn bng du

1 Oil separator

Tch du 1

2

SV44

3

V4

CompressorsMy nn 1


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V4 system 1.DC inverter compressorMy nn bin tn DC

Discharge pipeng nn

Suction pipe

ng ht

PWM valve

Discharge Pipe

ng nn

Suction Pipe

ng ht

Compressors of V4 and D3

V4 DC inverter compressor

(Hitachi)

D3 digital scroll compressor

(Copeland)

Oil return pipeng hi du


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V4 system 3.Oil balance

Oil balance pipeng cn bng du

Gas balance pipeng cn bng gas

Between oil separatorsGia cc bnh tch du vi nhau

Between gas-liquid separatorsGia cc bnh tch lng vi nhau

Oil balance pipe

ng cn bng du


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V4 system 4.SV4 valve

SV4: Oil return valve. Van hi du

Opens when the inverter compressor is running for 5 minutes and then closes 15 minutes later. (For the

system has only one outdoor unit) m ra khi my nn bin tn m ra chy c 5 pht,v ng li sau 15

pht (dng cho h thng ch c 1 my ngoi )

Every 20 minutes, SV4 of each outdoor unit opens for 3 minutes. (For the system has more than one

outdoor units) v mi 20 pht ,van SV4 ca my ngoi m ra 3 pht (dng cho h thng nhiu hn 1 my

ngoi )

Gas balanceCn bng gas

Oil balanceCn bng du

SV4

SV4


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Thank you!Thank you!

3. vrf refrigerant cycle ok

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