Gree LSQWRF35VM/NaA-M Service Manual page 42

(3) Prefabricate pipes
1) Make out the installation drawing which clearly indicates the branch pipes, pipe diameter, reduced
pipes, location of valves, installation dimensions etc. Then, prefabricate pipes in accordance this
installation drawing. Pipes should be processed with dedicated cutting machine, leaving no burrs at
the pipe ends. After that, pipes should be cleaned to prevent sands and dusts from damaging the
joint.
2) Pipe supports should be prefabricated in accordance with design requirements. The contact part
between supports and pipes should be separated with wood blocks which has taken anti-corrosion
treatment and is as thick as the insulation.
(4) Install hangers and brackets
1) The supporting beam should be fastened to the wall, pillar or other building structure. It should be
placed horizontally with the top surface parallel with the center line of the pipe.
2) Pattern, installation, interval and standard height of supports for metal pipes should meet
corresponding design requirements and codes.
3) Supports should be installed securely and contact the pipe closely. Separate supports are
required at the connection joint between the pipe and the equipment.
4) Supports for chilled and cooling water pipes as well as main and branch pipes in the machine
room should be anti-vibration.
5) When a single-bar hanger is used, anti-vibration hangers should be set up every 15m and at the
pipe ends, valves, tee joints and elbows.
See the table below for the interval of brackets.
Diameter (mm)
Max interval
Insulated pipe
between
Non-insulated
brackets
pipe
(m)
Max interval
Insulated pipe
between
Non-insulated
brackets
pipe
(m)
It is applicable to the pipes with working pressure less than 2.0 and insulation density less than
3
200kg/m or without any insulation.
(5) Install pipes
Supply and return water pipes with the diameter of being or being less than DN32 should be thread
connected, and pipes with the diameter of being or larger than DN40 should be welded. Those which must
be detachable should be flange connected. Before installation, foreign matters inside the pie should be
removed.
Unit Installation
15 20 25
1.5 2 2.5
2.5 3 3.5
5 5 5.5
6.5 6.5 7.5
NOTE
38
32 40 50
2.5 3 3.5
4 4.5 5
6.5 7.5 8.5
7.5 9 9.5
70
4
6
9.5
10.5