Installation Of Refrigerant Piping - McQuay MDS 30 Installation Manual


Installation of refnet and distributor should be within the allowable tolerance as shown in diagrams below.

Installation of the system should within the piping length limitation as shown below.
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
6.4 Insulation of refrigerant piping

All refrigerant piping must be insulated to ensure heat exchange efficiency and prevent water condensing.

Specification of insulation material is as below.
Insulation Material
Layer
18
Direction A
30-50
100
Actual piping length 50
Equivalent length 60
25
outdoor above 20
indoor above 20
Adhering material＋Chloroethylene foam＋adhering strip
Indoor
Bare floor
outdoor
Horizontal
installation
Horizontal
MDS
60-70 80-320
150 350
70 125
80 150
30 40
30 50
30 40
Maximum height
between indoor units
Fiberglass＋Steel
Chloroethylene insulation strip
Water proof flax＋Bronze Pitch
Water proof flax＋galvanized panel＋painting
<30 °
Direction A
view
Vertical
installation
5MDS
50 60-70
100 150
50 70
60 80
25 30
20 30
20 30
15
Outdoor
Oil trap
(every 6~8m fall of the
gas pipe set a oil trap)
Indoor
Installation Manual IM-MDS_(i)
80-500
500
150
175
65
50
40