GMV DC Inverter VRF
35
Step 5
①
Pull the canvas casing
upside down and press
it on the butt flange of
the steel pipe
ventilation pipe with
steel bars;
②
Drill holes with the
manual drill and fix
them with
self-tapping screws;
③
Seal the two butt joints
with tinfoil panel and
check the reliability of
the connection.
___
3.6 Vacuum and Drying of Refrigeration System
3.6.1 Air Tightness Test
(1) Notices
1) The range of test pressure gauge for R410A system should be above 4.5MPa.
2) Record the pressure gauge readings, ambient temperature and test time.
3) Pressure correction: The temperature changes by 1
℃
, and the pressure changes by
0.01MPa.
4) The pressure should remain unchanged to be qualified.
5) If it is necessary to maintain pressure for a long time, the pressure should be reduced to
0.5MPa or less. Long periods of high pressure can cause leakage at the weld site and
there is safety hazard.
6) Before the air tightness test for the refrigerant pipe is completed, it is not allowed to
conduct the insulation and wrapping work for any joints between the welding point and
the bell mouth of indoor unit. Please increase pressure from the outdoor side pipes at
the same time. It is forbidden to increase pressure from one side pipe:
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