McQuay MDS030A - Page 65

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Design & installation Guide For McQuay MDS Multi System
3.5 Refnet joint selection
3.5.1 Copper pipe selection ( MDS100BR )
■ Diameter of the main pipe and that of the remotest pipe(equivalent length<90m)
Main pipe：φ 12.7/ φ 28.6(the same as the outdoor unit）
The remotest pipe: the same as the indoor unit
■ Refer to the refrigerant pipe to calculate the cooling capacity of downstream A
A-B-C: 17.4 KW
A-D-E: 11.8 KW
■ Select the pipe diameter of downstream A
Diameter of A-B: φ 12.7/ φ 25.4
Diameter of A-D: φ 9.52/ φ 19.05
■ We can use the same method to select the pipe diameter of downstream B and D.
Diameter of B-C: φ 9.52/ φ 19.05
Diameter of D-E: φ 9.52/ φ 15.88
3.5.2 Refnet joint selection
■ Refer to the refnet joint specification to select the refnet joint for Point A.
A: Refnet joint to liquid pipe: MDS-Y2
A: Refnet joint to gas pipe: MDS-Y1
■ We can adopt the same method to select the refnet joint for point B to D.
B: Refnet joint to liquid pipe: MDS-Y2 B: Refnet joint to gas pipe: MDS-Y1
C: Refnet joint to liquid pipe: MDS-Y2 C: Refnet joint to gas pipe: MDS-Y4
D: Refnet joint to liquid pipe: MDS-Y2 D: Refnet joint to gas pipe: MDS-Y4
E: Refnet joint to liquid pipe: MDS-Y2 E: Refnet joint to gas pipe: MDS-Y2