Monitor the evacuation procedure to maintain at least a required vacuum value
of 375 Micron (0.5 mbar or 50 Pa) or higher. The time used for maintaining this
value is related to the contamination of the system. In case you cannot achieve
this required vacuum level the following analysis should take place:
1. Check the system connected tools and hose connections for any leak-
ages.
2. Check the complete system for leakages.
3. Otherwise there is a high content of water in the system.
For situation No. 3 an additional flushing of the system with OFDN can support
the evacuation procedure and decrease the time spent to maintain the desired
vacuum level.
To ensure that there is no leak left in the system the desired vacuum level
should be held without any significant rise during a 30 minutes time span whilst
isolated (valve “C” closed at the manifold gauge set) and, with switched off vac-
uum pump.
For the intention to carry out a multiple evacuation process (to increase the dry-
ness level within the system), do not break the vacuum with refrigerant! Only
use OFDN for this purpose.
NOTE:
The required
vacuum value
is of about
375 Micron
(0.5 mbar,
50 Pa) or
higher!
Measure the
vacuum level
with a reliable
vacuum gauge
Example Vacuum Pump
Example Vacuum Hose
⅜” with SAE connections
Electronic Vacuum Gauge
for Micron, Hg, mbar, Pa
indication
Solenoid Valve
⅜” and ¼” SAE male flare
connection
Oil-mist Filter with
Venting-Hose adapter
To break the
vacuum
(multiple
evacuation
process) only
use OFDN gas!
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