Requirements On Piping - Gree LSQWRF35VM/NhA-M Service Manual

Keep the purge valve of the water system open in order to drain the evaporator and condenser
completely.

3.4.2 Requirements on piping

The piping slope should meet design and construction regulations and the flexible pipe is not allowed
to be longer than 150mm.
Pipes which go through the dilatation joint and the settlement joint should be protected with the flexible
joint.
No matter which connection is used, welding, threaded connection or flange connection, the connection
joint can't be in the wall, floor or sleeve pipe.
The riser pipe should be installed vertically. When the floor height is or less than 5m, a pipe clip
is required. When the floor height is or larger than 5m, at least 2 pipe clips should be required. The
installation height of the pipe clip is 1.8m. For the main riser pipe, it should be secured with the fixed
bolster to support the weight of the riser pipe.
See the table below for the installation standards of the pipes.
Item
Straightness
Verticality
Interval of Parallel Pipes
Parallelism of Parallel Pipes
Check documents
and drawings
Install hangers
and brackets
Take the anti-corrosion
and insulation treatment
(1) Check documents and drawings
1) Check the process flow, construction procedures and quality requirements in accordance with
drawings and technical data.
2) Check the installation location, installation height, arrangement, and installation space of pipes in
accordance with equipment drawings and building drawings.
(2) Check materials
1) Before installation, check for the mode of the valves, clean them and then take the strength and
air-proof tests.
2) Pipes should be cleaned with a steel brush or abrasive paper. After that, seal the pipe ends and
keep both the internal and external surface dry.
3) Pipes should be painted twice with anti-rust paint without any curtaining and voids.
Unit Installation
Allowable deviation
DN≤100mm 2L‰, max.440mm
DN>100mm 3L‰, max.460mm
25L‰, max.425mm
15mm
3mm
Piping flowchart
NOTE
By the ruler, tape measurement
By the ruler, tape measurement
By the ruler, tape measurement
By the ruler, tape measurement
Check materials
Install pipes
Rinse pipes
32
Inspection method
Prefabricate pipes
Take the pressure
test
Take protective
measures to the
finished products