McQuay MDS Series User Manual

4 Service Manual SM-MDS_(ii)
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.
R-22
R-410A
Length (m)
3-5HP
6-7 HP
8-32 HP
5HP
6-7 HP
8-50 HP
Piping
Total equivalent length
100
150
350
100
150
500
Maximum length of
longest branch
Actual piping length
50
70
125
50
70
150
Equivalent length
60
80
150
60
80
175
Maximum equivalent length from first
branch to furthest unit
25
30
40
25
30
65
Height
Between further
indoor and outdoor
outdoor above
20
30
50
20
30
50
indoor above
20
30
40
20
30
40
Maximum height between indoor unit
15
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
Maximum height
between indoor units
Height between further
indoor and outdoor
Maximum length of
longest branch
1

McQuay MDS Series Specifications

General

Brand	McQuay
Model	MDS Series
Category	Compressor
Language	English