page 1 mcquay digital scroll system unit & piping selection

MCQUAY DIGITAL SCROLL SYSTEM

Unit & Piping Selection

Sample of InstallationSample of Installation

Main Factors to consider during Piping Selection• Location of equipment

• Indoor Unit• Outdoor Unit• Refnet & Distributor Joint

Unit & Piping SelectionUnit & Piping Selection

These item will influence the piping layout and length of the design

Some other factors to consider during Piping Selection• Equivalent Piping Length

• Type of Joint for branches

• Outdoor capacity factor

• Piping length & height factor

• Refrigerant Pipe Specification


Equivalent length is the converted length and includes parts such as elbow, which has pressure losses in the pipe. The formula is as follow:

Equivalent length= Real length of tubing + No. of elbow × Equivalent length of each elbow + No. of oil trap ×Equivalent length of each oil trap

Equivalent Piping CalculationEquivalent Piping Calculation

Elbow Oil Trap9.52 0.18 1.30

12.70 0.20 1.5015.88 0.25 2.0019.05 0.35 2.4022.02 0.40 3.0025.40 0.45 3.4028.58 0.50 3.7031.80 0.55 4.00

Diameter of Pipe

Equivalent Length

Restriction of Piping LengthRestriction of Piping Length

3~5 Hp 6 Hp 8~10 Hp 12~30 Hp100 125 250 350

Actual piping length 50 70 125 150Equivalent length 60 80 150 200

25 30

Outdoor above 20 30Indoor above 20 30

Length (m)

Piping

Height

Maximum equivalent length from first branch to furthers unit

Maximum height between indoor unit

Maximum length of longest branch

Between further indoor and outdoor

Total equivalanet length

15

40

5040

Important Factor to ConsiderImportant Factor to Consider

Example:Outdoor Model : MDS100BRPipe Diameter : 28.6 mmMain Pipe : 80mBranch Length: 20mElbows: 10 unitsOil traps: 3 units

Elbow Oil Trap9.52 0.18 1.30

12.70 0.20 1.5015.88 0.25 2.0019.05 0.35 2.4022.02 0.40 3.0025.40 0.45 3.4028.58 0.50 3.7031.80 0.55 4.00

Diameter of Pipe

Equivalent Length

Equivalent Length

= Real length of tubing + No. of elbow × Equivalent length of each elbow + No. of oil trap ×Equivalent length of each oil trap= (80 + 20) + (10 X 0.5) + (3 X 3.7) = 116.1 m

When the equivalent length is over 90% of the maximal real length the diameter of the main tubing (from the outdoor unit to the first branch joint) should be one size bigger than normal.

Important CriteriaImportant Criteria

After expanded the gas pipe to a larger diameter, the equivalent length need to be recalculate. The formula is as follow:

Expanded Equivalent Length = Equivalent length of main piping X 0.5 + equivalent length of the branch

Criteria 1

Criteria 2


3~5 Hp 6 Hp 8~10 Hp 12~30 Hp100 125 250 350

Actual piping length 50 70 125 150Equivalent length 60 80 150 200

25 30

Outdoor above 20 30Indoor above 20 30

Length (m)

Piping

Height

Maximum equivalent length from first branch to furthers unit

Maximum height between indoor unit

Maximum length of longest branch

Between further indoor and outdoor

Total equivalanet length

15

40

5040

Maximum allow actual length for 10Hp is 125mCalculated Equivalent Length is 116.1mRatio of Equivalent Length over Maximum allow Actual Length= 92.88%

Equivalent length is over 90% of the maximal real length the diameter of the main tubing. Hence the gas Pipe of MDS100BR need to change.

Example:

Refrigerant Copper Pipe Specification : MDS-B



Example:

Hence the gas Pipe of MDS100BR need to change from 28.6 mm to 34.9 mmAfter expanded the gas pipe to a larger diameter, the equivalent length need to be recalculate.

Expanded Equivalent Length = Equivalent length of main piping X 0.5 + equivalent length of the branch

Main Pipe : 80mBranch Length: 20mElbows: 10 unitsOil traps: 3 units

Equivalent Length

= Real length of tubing + No. of elbow × Equivalent length of each elbow + No. of oil trap ×Equivalent length of each oil trap= (80 + 20) + (10 X 0.5) + (3 X 3.7) = 116.1 m

Expanded Equivalent Length = [80 + (10 X 0.5) + (3 X 3.7)] X 0.5 + 20

Expanded Equivalent Length = 68.05 m

• Type of Joint for branchesInfluence the piping layout design

• Outdoor capacity factorInfluence by the design ambient temperature and

indoor temperature• Piping length & height factor

Influence by the location of outdoor and the total piping length

• Refrigerant Pipe SpecificationUse to determine the branches diameter


Selection of branch joint / distributors for MDS


ModelMDS-Y1MDS-Y2MDS-Y3MDS-Y4MDS-Y6MDS-Y7MDS-C1MDS-C2MDS-C3

Refnet Joint (2 Branches)

Distributors Header (4 Branches)

MDS-Y1~Y4 dimensional drawing


A B C D E

(outer diameter)

F G H I

(outer diameter)

J K L M N

(outer diameter)

O P Q R

MDS-Y1 553 172 293 120 28.6 28.9 25.7 22.5 28.6 28.9 25.7 22.5 19.3 22.2 19.3 16.1 12.9 9.7MDS-Y2 420 142 223 80 15.88 16.1 12.9 9.7 12.7 12.9 9.7 6.5 12.7 12.9 9.7 6.5MDS-Y3 420 142 223 80 15.88 16.1 12.9 9.7 12.7 12.9 9.7 6.5 15.88 16.1 12.9 9.7MDS-Y4 493 142 223 80 22.2 22.5 19.3 16.1 19.1 19.3 16.1 12.9 9.7 19.1 19.3 16.1 12.9

Diameter (mm)Refnet model

Length(mm) Diameter (mm) Diameter (mm)

MDS-Y6 dimensional drawing


MDS-Y7 dimensional drawing


MDS-C1 dimensional drawing


MDS-C2~C3 dimensional drawing



Using Distribution Header may lead to imbalance refrigerant flow.

Connection Type of Refnet Joint/Distributors


Refnet Joint


Connection Type of Refnet Joint/Distributor

Distributor


Connection Type of Refnet Joint/Distributors

Refnet Joint Distributor


Cooling Capacity Correction Factor


Heating Capacity Correction Factor

Cooling cap. factor


Cooling Capacity Correction Factor


Heating Capacity Correction Factor

Refrigerant Pipe Specification : MDS-A


Refrigerant Pipe Specification : MDS-B



Example

C

A B

D

E

F

Building Type: Building Type: BungalowBungalow

ExampleRequirement• Cooling only model• Ambient temperature : 35.0 °C• Indoor temperature : 22.0 °C

Other Information• Piping length ： 40m• Height between I/O ： 4m• Outdoor Unit located below indoors

Unit - AWall

Mounted

Unit - BWall

Mounted

Unit - CWall

Mounted

Unit - DWall

Mounted

Unit - ECeiling

Cassette

Unit - FCeiling

Concealed

1.8 2.0 2.2 4.0 5.0 5.8

Required Cooling Capacity

(kW)



Indoor RequirementWall Mounted

MWMD 010GR MWMD 015GR MWMD 020GR MWMD 025GRBtu/h 9500 12000 19000 23500

W 2780 3520 5569 6887Btu/h 9500 12000 19500 24000

W 2780 3520 5715 7034MWMD 010G MWMD 015G MWMD 020G MWMD 025G

Btu/h 9500 12000 19000 24000W 2780 3520 5569 7034

Ceiling CassetteMCKD 010C MCKD 015C MCKD 020AR MCKD 025AR MCKD 030AR MCKD 040AR MCKD 050AR

Btu/h 9500 12000 19000 23500 30000 39500 48000W 2780 3520 5569 6887 8792 11569 14067

Btu/h 9500 12000 19500 24000 31000 41000 50000W 2780 3520 5715 7034 9085 12016 14654

MCKD 010C MCKD 015C MCKD 020A MCKD 025A MCKD 030A MCKD 040A MCKD 050ABtu/h 9500 12000 19000 24000 29000 39500 48500

W 2780 3520 5569 7034 8793 11570 14200

Ceiling ConcealedMCCD 010CR MCCD 015CR MCCD 020CR MCCD 025CR MCCD 028CR MCCD 030DR MCCD 038CR MCCD 040DR MCCD 050DR

Btu/h 9500 12000 19000 23500 28000 30000 37000 39500 48000W 2780 3520 5569 6887 8210 8792 10844 11569 14067

Btu/h 9500 12000 19500 24000 28500 31000 38000 41000 50000W 2780 3520 5715 7034 8353 9085 11137 12016 14654

MCCD 010C MCCD 015C MCCD 020C MCCD 025C MCCD 028C MCCD 030D MCCD 038C MCCD 040D MCCD 050DBtu/h 9500 12000 19000 24000 28000 29000 37000 39500 48500

W 2780 3520 5569 7034 8210 8793 10844 11570 14200

NOMINAL HEATING CAPACITY

COOLING ONLY MODEL

NOMINAL CAPACITY

HEATPUMP MODEL

NOMINAL COOLING CAPACITY

NOMINAL CAPACITY

NOMINAL CAPACITY

HEATPUMP MODEL



COOLING ONLY MODEL

HEATPUMP MODEL



COOLING ONLY MODEL

Unit - A Wall Mounted 1.8Unit - B Wall Mounted 2.0Unit - C Wall Mounted 2.2Unit - D Wall Mounted 4.0Unit - E Ceiling Cassette 5.0Unit - F Ceiling Concealed 5.8

Required Cooling Capacity(kW)

Example

A B C D E F

Capacity, kW 1.8 2.0 2.2 4.0 5.0 5.8

Model 010 010 010 020 020 025

HP of indoor unit 2.78 2.78 2.78 5.59 5.59 7.03

Total Indoor capacity is 26.55 kW


Example

Selection Criteria Indoor cap. should between 50% ~ 120% of the outdoor

cap. We recommend that the outdoor capacity equals to the

indoor capacity or a little larger than the indoor capacity


Example

Selected Outdoor : MDS100B

Cooling Capacity : 28.0kW

%7.94

%10028

55.26

%100

/

CapacityOutdoorCapacityIndoorTotal

RatioOI

Comply to selection criteria


kW kWMDS080 24.5 26.0MDS100 28.0 30.0MDS120 32.5 3.0MDS150 40.0 43.0MDS180 47.5 50.0MDS200 50.0 53.0MDS220 55.0 58.0MDS240 65.0 68.0MDS260 70.0 75.0MDS280 75.0 80.0MDS300 80.0 85.0

ModelCooling Capacity

Heating Capacity

Example Selected Outdoor and Indoor Model

Outdoor Model MDS100B 28.0 kW

Indoor A MWMD 010G 2.78 kW

Indoor B MWMD 010G 2.78 kW

Indoor C MWMD 010G 2.78 kW

Indoor D MWMD 020G 5.59 kW

Indoor E MCKD 020A 5.59 kW

Indoor F MCCD 025C 7.03 kW


ExampleOutdoor Capacity factor• Cooling only model• Ambient temperature : 35.0 °C• Indoor temperature : 22.0 °C

1.08


Example Piping length & height factor• Piping length ： 40m• Height between I/O ： 4m• Outdoor Unit located below indoors

97%


Example

Total Capacity

= Outdoor Capacity X Outdoor Capacity Factor

X Piping length & height Factor

= 28.0 kW X 1.08 X 97%

= 29.3 kW



Example

C

A B

D

E

F

Building Type: BungalowBuilding Type: Bungalow

Example 1.1. Selection pipe diameterSelection pipe diameter

A B C

D E

MDS100B

MCCD 025C MWMD 010G MWMD 010G

MWMD 020GMCKD 020A MWMD 010G

7.03 kW2.78 kW 2.78 kW

5.59 kW5.59 kW

2.78 kW


A B C

D E

MDS100B



7.03 kW2.78 kW 2.78 kW

5.59 kW5.59 kW 2.78 kW

Example

Main pipeMain pipe diameter : diameter : ø ø 12.712.7mm / ø mm / ø 28.628.6mmmm

Calculate the downstream capacityCalculate the downstream capacity

Point APoint A

A-B-C : 12.59 kWA-B-C : 12.59 kW

A-D-E : 13.96 kWA-D-E : 13.96 kW

Point BPoint B

B-C : 5.59 kWB-C : 5.59 kW

D-E : 8.37 kWD-E : 8.37 kW




Point APoint A

A-B-C : 12.59 kWA-B-C : 12.59 kW

A-D-E : 13.96 kWA-D-E : 13.96 kW

A B C

D E

MDS100B



7.03 kW2.78 kW 2.78 kW

5.59 kW5.59 kW 2.78 kW

Example



A-B diameter : A-B diameter : ø ø 9.529.52mm / ø mm / ø 19.0519.05mmmm

A-D diameter : ø 9.52mm / ø 19.05mm

A B C

D E

MDS100B



7.03 kW2.78 kW 2.78 kW

5.59 kW5.59 kW 2.78 kW

Example


Point BPoint B

B-C : 5.56 kWB-C : 5.56 kW

B-MCCD25C : 7.03 kWB-MCCD25C : 7.03 kW



Point BPoint B

B-C : 5.56 kWB-C : 5.56 kW

B-MCCD25C : 7.03 kWB-MCCD25C : 7.03 kW

A B C

D E

MDS100B



7.03 kW2.78 kW 2.78 kW

5.59 kW5.59 kW 2.78 kW

Example

Main pipeMain pipe diameter : diameter : ø ø 12.712.7 / ø / ø 28.628.6


A-B: A-B: ø ø 9.529.52

/ ø / ø 19.0519.05

A-D: ø 9.52

/ ø 19.05

B-MCCD25C: B-MCCD25C: ø 9.52 / ø1ø 9.52 / ø15.885.88

B-C: B-C: ø 9.52 / ø1ø 9.52 / ø15.885.88

All unit in mm

Example

Location Capacity (kW)

Liquid pipe (ø,mm) Gas pipe (ø,mm)

Inlet Outlet Inlet Outlet

A-B 13.20 12.70 9.52 28.60 19.05

A-D 14.70 12.70 9.52 28.60 19.05

B-C 5.86 9.52 9.52 19.05 15.88

D-E 8.79 9.52 9.52 19.05 15.88


Example

A B C

D E

MDS100B



A-B diameter : A-B diameter : ø ø 9.529.52mm / ø mm / ø 19.0519.05mmmm

B-C diameter : B-C diameter : ø 9.52mm / ø1ø 9.52mm / ø15.885.88mmmm

A-D diameter : A-D diameter : ø 9.52mm / ø 19.05mmø 9.52mm / ø 19.05mm D-E diameter : D-E diameter :

ø 9.52mm / ø15.88mmø 9.52mm / ø15.88mm



Example 2.2. Selection of branchSelection of branch

Select the refnet joint of point ASelect the refnet joint of point A

A (liquid) A (liquid) : MDS-: MDS-Y2Y2

A (gas) A (gas) : MDS-: MDS-Y1Y1


A B C D E

(outer diameter)

F G H I

(outer diameter)

J K L M N

(outer diameter)

O P Q R

MDS-Y1 553 172 293 120 28.6 28.9 25.7 22.5 28.6 28.9 25.7 22.5 19.3 22.2 19.3 16.1 12.9 9.7MDS-Y2 420 142 223 80 15.88 16.1 12.9 9.7 12.7 12.9 9.7 6.5 12.7 12.9 9.7 6.5MDS-Y3 420 142 223 80 15.88 16.1 12.9 9.7 12.7 12.9 9.7 6.5 15.88 16.1 12.9 9.7MDS-Y4 493 142 223 80 22.2 22.5 19.3 16.1 19.1 19.3 16.1 12.9 9.7 19.1 19.3 16.1 12.9

Diameter (mm)Refnet model

Length(mm) Diameter (mm) Diameter (mm)

A-D diameter : A-D diameter : ø 9.52 / ø 19.05ø 9.52 / ø 19.05

Main pipe diameter : Main pipe diameter : ø 12.7 / ø 28.6ø 12.7 / ø 28.6

A-B diameter : A-B diameter : ø 9.52 / ø 19.05ø 9.52 / ø 19.05

All unit in mm

AA

Example

AB C

D E

MDS100B



A-B: A-B: ø ø 9.529.52 / / ø ø 19.0519.05

B-C: B-C: ø 9.52 / ø 9.52 / ø1ø15.885.88

A-D: A-D: ø 9.52 / ø 9.52 / ø 19.05ø 19.05

D-E: D-E: ø 9.52 / ø 9.52 / ø15.88ø15.88

Main pipeMain pipe diameter : diameter : ø ø 12.712.7 / ø / ø 28.628.6


Liquid GasMWMD 010G 6.35 9.52MCCD 025C 9.52 15.88MWMD 010G 6.35 9.52MCKD 020A 6.35 15.88MWMD 020G 6.35 15.88MWMD 010G 6.35 9.52

ModelIndoor Valve Size (Ø, mm)

All unit in mm

Example

2.2. Selection of branchSelection of branch

Select the refnet joint of point

A (liquid): MDS-Y2 A (gas) : MDS-Y1

B (liquid): MDS-Y3 B (gas) : MDS-Y4

C (liquid): MDS-Y2 C (gas) : MDS-Y2

D (liquid): MDS-Y2 D (gas) : MDS-Y4

E (liquid): MDS-Y2 E (gas) : MDS-Y4


Example

Formula:

G = ∑ Li* Gi

Using liquid tube length to calculate required refrigerant → Add in refrigerant

G : Refrigerant charge amountLi : The each section of liquid tube length in all (m)Gi : Charge amount per length （ g/m）


Example

5m (9.52mm)

5m (9.52mm)

2m (6.35mm)

15m (9.52mm)

5m (6.35mm)

2m (6.35mm)

3m (9.52mm)

1m (6.35mm)

1m (9.52mm) 1m

(6.35mm)

A B C

D E

MDS100B

MCCD 25C MWMD 10G

MCKD 20A

1m (12.70mm)


MWMD 10G

MWMD 10GMWMD 20G

Total Piping Length12.7mm – 1m9.52mm – 29m6.35mm – 11m

Example

Additional charge amount :

= ∑ Li* Gi

= (Piping Length for 15.88mm X Refrigerant Charge Amount)

+ (Piping Length for 12.7mm X Refrigerant Charge Amount)



= (0 X 180) + (1 x 120) + (29 x 80) + (11 x 50)

= 2990 g


Liquid tube diameter (mm) 6.35 9.52 12.7 15.88

Refrigerant charge amount (g/m)

50 80 120 180

Total Piping Length12.7mm – 1m 9.52mm – 29m 6.35mm – 11m

EXV BoxEXV BoxEXV BoxEXV Box

Unit & Piping SelectionUnit & Piping SelectionElectronic Expansion Valve

Indoor Unit EXV Box ModelMCCD 010/15MCKD 010/15MWMD 010/15 MEX-14-2SA-B

MWMD 020 MEX-18-2SA-BMCCD 020/25MCKD 020/25

MWMD 025 MEX-18-3SA-BMCCD 030/40/50/60

MCKD 030/40MCKD 050 MEX-30-3SA-A

MEX-14-2SA-A

MEX-18-3SA-A

MEX-24-3SA-A

Unit & Piping SelectionUnit & Piping SelectionElectronic Expansion Valve

3 units

1 unit

2 units

Software Demo

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page 1 mcquay digital scroll system unit & piping selection

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