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5CSL0-06B
2.7.4 Vacuum drying procedure
There are two vacuum drying methods and the appropriate one
should always be chosen to confirm with individual local conditions.
[Normal vacuum drying]........The standard method
[Operational steps]
1. Vacuum drying (1st time): Connect a manifold gauge to the service
port of the liquid or gas pipe and operate the vacuum pump
for at least 2 hours.
(The degree of vacuum produced should be in excess of 5 Torr)
If after 2 hours the vacuum produced has not exceeded 5 Torr
then either there is moisture in the pipe or there is a leak.
Operate the vacuum pump for further one more hour.
If, even after 3 hours, the vacuum has not reached 5 Torr then
check the system for a leak.
2. Carry out vacuum test.
Produce a vacuum in excess of 5 Torr and do not release it for
an hour or more. Check the vacuum gauge to make sure that it
has not risen. (If the gauge rise then there is still moisture in the
pipe or there is a leak somewhere.)
3. Additional charge of refrigerant.
Connect the charging cylinder to the liquid pipe service port and
charge with the required amount of refrigerant.
4. Open stop valve to the full.
Open the stop valve on the liquid and the gas pipes to the full.
NOTE
Vacuums should be produced in both the liquid and the gas pipes.
(Because there are a large number of functional components in the
indoor unit which cut off the vacuum mid-way through)
Rising pressure
Falling
pressure
(vacuum)
+0.05MPa
(Atmospheric
pressure)
0 MPa
Vacuum
drying
Vacuum drying works
Maintaining
vacuum test
(2 hours) (1 hours)
Time required: approximately 3 hours.
Guideline for each installation process 315
0 MPa
-200 mmHg
-400 mmHg
-600 mmHg
-700 mmHg
-760 mmHg
-755 mmHg
(5 Torr)
Time.
Additional refrigerant
charge