Gree A Series Service Manual page 87

A Series Modular-type Air-cooled (Heat Pump) Chiller
when all main pipe and riser pipes have been installed. The pressure test should be taken prior
to the insulating procedure and done in accordance with the following statement.
(1)The pressure test should be done one section by another. The manometer should be in-
stalled at the lowest point of the testing pipes.
(2)Water should be charged from the lowest point. During charging, close all inlet valves and
drain valves, but open the manifold valve and each valve at the branch pipes. During the
pressure test, it can't be put into normal use. Special attention should be paid that the ex-
haust valve should be opened until air inside the system is removed completely.
(3)For the heat pump system, when the working pressure is or less than 1.0MPa, the test
pressure should be 1.5 times of the working pressure but no less than 0.6MPa; when the
working pressure is larger than 1.0MPa, the test pressure is the working pressure plus
0.5MPa.
(4)Raise the pressure to the test pressure and the test pressure should be kept for 10 mi-
nutes. Then, lower the pressure to the working pressure and the working pressure should
be kept for 60 minutes. No leakage through the visual inspection indicates it is satisfactory.
(5)The filling water test is taken for the condensate water system. No leakage through the
visual inspection indicates it is satisfactory.
5.5.2.8 Anti-corrosion and Insulation
(1)Anti-corrosion: supply water and return water pipes, branch pipes, and pipe brackets
should be painted with anti-rust paint twice. The damaged galvanized condensate pipes
and pipes with exposed thread also should be touched up with anti-rust paint.
1) Pipes should be painted evenly and the paint thickness should meet relative
requirements.
2) Pipes should be painted without curtaining and holidays.
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