TICA TIMS-X Series, Руководство по установке и эксплуатации

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32
Air Tightness Test, Vacuuming
and Supplementing Refrigerant
For TIMS units, vacuum pump, pressure gauge, compound pressure gauge and charging
hose used for R410A refrigerant are different from those used for R22 refrigerant. Make sure
to use R410A dedicated tools.
Air tightness test
Notes:
●
After piping work is completed, make
sure to do air tightness test for IDU and
piping.
● Do not use flammable gas or air
(oxygen) as pressurized gas,
otherwise fire or explosion may be
caused; use nitrogen only.
To IDU
To IDU
Gas pipe
Liquid pipe
Overhaul
valve hole
Compound
pressure gauge
N
itrog
en
cyl
ind
er
Steps:
(1) Use a vacuum pump to discharge air
out of the system from the spool of
liquid-side check valve. Hold gauge
pressure at -1 kgf/cm
2
for one hour. If
pressure increases, the system may
contain water or leak; otherwise, perform
the next step.
(2) Close the vacuum pump and increase
pressure by 0.3 MPa from the spool of
air-/liquid-side check valve and hold it for
three minutes. Check whether there are
major leakage points.
(3) Continue to increase pressure to 1.5
MPa for three minutes, and check
whether there are minor leakage points.
(4) Continue to increase pressure to 4
MPa for 24 hours (consider the impact
from the ambient temperature), and
check whether are micro leakage points.
Notes:
● Use nitrogen in air tightness test instead of
oxygen, flammable and toxic gas, or water.
● Use a pressure gauge dedicated for R410A
with a range above than 4.5 MPa.
● Connect high pressure pipe and low pressure
pipe and increase pressure for them at the
same time without connecting to ODU.
● After passing the air tightness test, the unit is
required to lower the levels of pressure to 0.2
to 0.3 MPa and be stored at a fixed pressure.
Vacuumizing:
● Use the vacuum pump with over 4
L/S gas displacement The vacuum
pump ensures the vacuum degree of
the system below 755 mmHg.
● Use the vacuum pump equipped with
an electronic single way valve to
prevent lubricating oil from entering
the refrigerant system against the
current.
● Vacuumize the gas pipe and liquid
pipe at the same time. Before
To IDU
To IDU
Overhaul
valve hole
Stop valve
Stop valve
Gas pipe
Liquid
pipe
ODU
Compound
pressure gauge
One-way
valve
Vacuum
pump