MCQUAY DIGITAL SCROLL SYSTEM

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MCQUAY DIGITAL SCROLL SYSTEM
Unit Piping Selection
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Sample of Installation
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Unit Piping Selection

• Main Factors to consider during Piping Selection
• Location of equipment
• Indoor Unit
• Outdoor Unit
• Refnet Distributor Joint

These item will influence the piping layout and
length of the design
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Unit Piping Selection

• 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

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Equivalent Piping Calculation
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
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Restriction of Piping Length
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Important Factor to Consider
Example Outdoor Model MDS100BR Pipe Diameter
28.6 mm Main Pipe 80m Branch Length
20m Elbows 10 units Oil 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

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Important Criteria
Criteria 1

• 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.

Criteria 2
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
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Important Factor to Consider
Example
Maximum allow actual length for 10Hp is
125m Calculated Equivalent Length is 116.1m Ratio
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.
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Unit Piping Selection
Refrigerant Copper Pipe Specification MDS-B
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Important Factor to Consider
Example
Hence the gas Pipe of MDS100BR need to change
from 28.6 mm to 34.9 mm After 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
80m Branch Length 20m Elbows 10 units Oil
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

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Unit Piping Selection

• Type of Joint for branches
• Influence the piping layout design
• Outdoor capacity factor
• Influence 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 Specification
• Use to determine the branches diameter

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Unit Piping Selection
Selection of branch joint / distributors for MDS
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Unit Piping Selection
MDS-Y1Y4 dimensional drawing
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Unit Piping Selection
MDS-Y6 dimensional drawing
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Unit Piping Selection
MDS-Y7 dimensional drawing
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Unit Piping Selection
MDS-C1 dimensional drawing
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Unit Piping Selection
MDS-C2C3 dimensional drawing
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Unit Piping Selection
Caution
Using Distribution Header may lead to imbalance
refrigerant flow.
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Unit Piping Selection
Connection Type of Refnet Joint/Distributors
Allow
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Unit Piping Selection
Connection Type of Refnet Joint/Distributor
Allow
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Unit Piping Selection
Connection Type of Refnet Joint/Distributors
Allow
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Unit Piping Selection
Connection Type of Refnet Joint/Distributors
Not Allow
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Unit Piping Selection
Cooling Capacity Correction Factor
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Unit Piping Selection
Heating Capacity Correction Factor
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Unit Piping Selection
Cooling Capacity Correction Factor
Cooling cap. factor
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Unit Piping Selection
Heating Capacity Correction Factor
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Unit Piping Selection
Refrigerant Pipe Specification MDS-A
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Unit Piping Selection
Refrigerant Pipe Specification MDS-B
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Unit Piping Selection
Example
Building Type Bungalow
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Unit Piping Selection
Example

• Requirement
• Cooling only model
• Ambient temperature 35.0 C
• Indoor temperature 22.0 C

• Other Information
• Piping length40m
• Height between I/O4m
• Outdoor Unit located below indoors

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Unit Piping Selection
Indoor Requirement
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Unit Piping Selection
Example

• Total Indoor capacity is 26.55 kW

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Unit Piping Selection
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

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Unit Piping Selection
Example
Selected Outdoor MDS100B Cooling Capacity
28.0kW
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Unit Piping Selection
Example

• Selected Outdoor and Indoor Model

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Unit Piping Selection
Example

• Outdoor Capacity factor
• Cooling only model
• Ambient temperature 35.0 C
• Indoor temperature 22.0 C

1.08
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Unit Piping Selection
Example

• Piping length height factor
• Piping length40m
• Height between I/O4m
• Outdoor Unit located below indoors

97
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Unit Piping Selection
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
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Unit Piping Selection
Example
Building Type Bungalow
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Unit Piping Selection
Example

• Selection pipe diameter

MDS100B
C
A
B
MWMD 010G
MCCD 025C
MWMD 010G
2.78 kW
2.78 kW
7.03 kW
D
E
MWMD 010G
MCKD 020A
MWMD 020G
2.78 kW
5.59 kW
5.59 kW
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Unit Piping Selection
Refrigerant Pipe Specification MDS-B
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Unit Piping Selection
Example
Calculate the downstream capacity Point
A A-B-C 12.59 kW A-D-E 13.96 kW Point
B B-C 5.59 kW D-E 8.37 kW
Main pipe diameter ø 12.7mm / ø 28.6mm
MDS100B
A
C
B
MWMD 10G
MCCD 25C
MWMD 10G
2.78 kW
2.78 kW
7.03 kW
D
E
MCKD 20A
MWMD 10G
MWMD 20G
5.59 kW
2.78 kW
5.59 kW
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Unit Piping Selection
Refrigerant Pipe Specification MDS-B
Point A A-B-C 12.59 kW A-D-E 13.96 kW
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Unit Piping Selection
Example
Main pipe diameter ø 12.7mm / ø 28.6mm
A-B diameter ø 9.52mm / ø 19.05mm
MDS100B
C
A
B
MWMD 10G
MCCD 25C
MWMD 10G
2.78 kW
2.78 kW
7.03 kW
D
E
MCKD 20A
MWMD 10G
MWMD 20G
A-D diameter ø 9.52mm / ø 19.05mm
5.59 kW
2.78 kW
5.59 kW
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Unit Piping Selection
Example
Point B B-C 5.56 kW B-MCCD25C 7.03 kW
MDS100B
C
A
B
MWMD 10G
MCCD 25C
MWMD 10G
2.78 kW
2.78 kW
7.03 kW
D
E
MCKD 20A
MWMD 10G
MWMD 20G
5.59 kW
2.78 kW
5.59 kW
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Unit Piping Selection
Refrigerant Pipe Specification MDS-B
Point B B-C 5.56 kW B-MCCD25C 7.03 kW
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Unit Piping Selection
Example
All unit in mm
Main pipe diameter ø 12.7 / ø 28.6
B-C ø 9.52 / ø15.88
B-MCCD25C ø 9.52 / ø15.88
MDS100B
C
A
B
MWMD 10G
MCCD 25C
MWMD 10G
A-B ø 9.52 / ø 19.05
2.78 kW
2.78 kW
7.03 kW
D
E
MCKD 20A
MWMD 10G
MWMD 20G
A-D ø 9.52 / ø 19.05
5.59 kW
2.78 kW
5.59 kW
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Unit Piping Selection
Example
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Unit Piping Selection
Example
Main pipe diameter ø 12.7mm / ø 28.6mm
A-B diameter ø 9.52mm / ø 19.05mm
B-C diameter ø 9.52mm / ø15.88mm
MDS100B
C
A
B
MWMD 10G
MCCD 25C
MWMD 10G
D
E
MCKD 20A
MWMD 10G
MWMD 20G
A-D diameter ø 9.52mm / ø 19.05mm
D-E diameter ø 9.52mm / ø15.88mm
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Unit Piping Selection
Example
All unit in mm

• Selection of branch

A-B diameter ø 9.52 / ø 19.05
Main pipe diameter ø 12.7 / ø 28.6
A
Select the refnet joint of point A A (liquid)
MDS-Y2 A (gas) MDS-Y1
A-D diameter ø 9.52 / ø 19.05
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Unit Piping Selection
Example
Main pipe diameter ø 12.7 / ø 28.6
B-C ø 9.52 / ø15.88
MDS100B
A
C
B
MWMD 10G
MCCD 25C
MWMD 10G
A-B ø 9.52 / ø 19.05
D
E
MCKD 20A
MWMD 10G
MWMD 20G
A-D ø 9.52 / ø 19.05
D-E ø 9.52 / ø15.88
All unit in mm
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Unit Piping Selection
Example

• Selection 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
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Unit Piping Selection
Example
Using liquid tube length to calculate required
refrigerant ? Add in refrigerant
Formula G ? Li Gi
G Refrigerant charge amount Li The each
section of liquid tube length in all (m) Gi
Charge amount per length(g/m)
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Unit Piping Selection
Example
Total Piping Length 12.7mm 1m 9.52mm
29m 6.35mm 11m
1m (12.70mm)
5m (9.52mm)
5m (9.52mm)
2m (6.35mm)
MDS100B
C
A
B
MWMD 10G
MCCD 25C
MWMD 10G
1m (9.52mm)
1m (6.35mm)
2m (6.35mm)
15m (9.52mm)
D
E
5m (6.35mm)
MCKD 20A
MWMD 10G
MWMD 20G
3m (9.52mm)
1m (6.35mm)
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Unit Piping Selection
Example
Total Piping Length 12.7mm 1m 9.52mm
29m 6.35mm 11m
Additional charge amount ? Li Gi (Piping
Length for 15.88mm X Refrigerant Charge Amount)
(Piping Length for 12.7mm X Refrigerant Charge
Amount) (Piping Length for 9.52mm X
Refrigerant Charge Amount) (Piping Length for
6.35mm X Refrigerant Charge Amount) (0 X 180)
(1 x 120) (29 x 80) (11 x 50) 2990 g
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Unit Piping Selection
Electronic Expansion Valve
EXV Box
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Unit Piping Selection
Electronic Expansion Valve
3 units
1 unit
2 units
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Unit Piping Selection
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Software Demo
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Thank You