Putting Under Drying Vacuum - Immergas AUDAX PRO 5 Instruction And Recommendation Booklet

5.8 PUTTING UNDER DRYING
VACUUM.
- To prevent foreign substances from getting into
the circuit and to ensure the essential resistance
to the pressures in play, it is fundamental that
only an R-410A manometric unit be used.
- Only a vacuum pump with a non return valve
must be used to prevent the oil inside it from
getting into the chiller circuit when it stops.
- Use a pump that is able to create a vacuum of
up to 500 mTorr (66 Pa).
- Completely close the service valves on the gas
and liquid side.
Attention: if pressure increases after an hour, this
means that there is residual water inside the pipe
and/or there are leaks.
Connect the manometric unit to the
liquid and gas pipes.
Using the vacuum pump, put the liquid
and gas pipes under vacuum and dry
them.
Putting under vacuum and drying must
last at least 2 hours and 30 minutes.
Close the valve once pressure drops to
500 mTorr.
5-13
Audax Pro 5
Manometric unit
5-12
Yes
Pressure increases
No
Put in the coolant
No
Vac uum
pump
Make sure the vacuum pump is equipped with a non
return valve as, otherwise, when it stops, the oil inside of
it would be sucked back into the coolant circuit.
The time necessary to put under vacuum and dry varies, as
it depends on the length and diameter of the pipes, as well as
on the outdoor air temperature. Drying and putting under
vacuum must, however, last at least 2 hours and 30 minutes.
Check the vacuum level using a vacuometer.
Check for leaks
The pressure increases due to residual
water in the pipes.
Put in dry nitrogen at a pressure of 0.05
MPa to dilute the moisture.
Put under vacuum and dry again, low-
ering the pressure down to 500 mTorr
(66Pa) for at least 2 hours
Pressure increases
19 19
Audax Pro 8 and 10
Manometric unit
V a c u u m
pump
Yes