Maximum Piping Length; Refnet And Distributor - McQuay MDS Series Service Manual

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1.5 Maximum Piping Length

The presence of sub-cooling circuit within MDS system has allowed the system to qualify for long piping
application. Besides that, MDS system is designed to ease oil return to the compressor and this has further
improved the maximum connectable piping length for each system.
Length (m)
Total equivalent length
Maximum length of
longest branch
Piping
Maximum equivalent length from first
branch to furthest unit
Between further
indoor and outdoor
Height
Maximum height between indoor unit
Height between further
indoor and outdoor
Maximum length of
longest branch

1.6 Refnet and Distributor

The refnet joint and distributor is provided by the factory in accordance with different indoor units. This will
reduce the work force at site and ease the piping installation work. The dimension of refnet and distributor
available is as follow:
Refnet Joint : MDS-Y1-A, MDS-Y2-A, MDS-Y3-A, MDS-Y4-A, MDS-Y5-A, MDS-Y6-A, MDS-Y7-A
Distributor : MDS-C1, MDS-C2, MDS-C3
Dimension of refnet model MDS-Y1-A, MDS-Y2-A, MDS-Y3-A and MDS-Y4-A
4
3-5HP
100
Actual piping length 50
Equivalent length 60
25
outdoor above 20
indoor above 20
R-22
6-7 HP 8-32 HP 5HP
150 350 100
70 125 50
80 150 60
30 40 25
30 50 20
30 40 20
15
Maximum height
between indoor units
R-410A
6-7 HP 8-50 HP
150 500
70 150
80 175
30 65
30 50
30 40
Service Manual SM-MDS_(ii)