Leak Testing - Berner 99989 Bedienungsanleitung

2. Evacuation of the cooling circuit
The ultimate vacuum is reached at between -0.85
.
and -0.9 bar (12.3 and 13 psi)
(green zone in vacuum meter display).
(see illustr. 8)
Close stopcock V2.
.
Disconnect compressed air supply from nozzle (3)
.
on venturi tube (C). (see illustr. 9)

3. Leak testing

The cooling system will remain under
.
vacuum for 1 minute. If the vacuum
falls, this indicates a leak in the cooling
system (observe vacuum meter display).
If the vacuum remains constant, filling
.
the cooling system can proceed.
(see illustr. 10)
4. Filling the cooling system
Caution:
The volume of coolant available to fill the
system must exceed the volume of coolant
required by 1-2 liters.
Avoid filling down to the last drop. Coolant
residues often contain particles of rust and
dirt.
These must not get into the KVB ..
or the coolant system being filled
under any circumstances.
V1
V2
A
V1
V2 C
D
(Illustr. 8)
3
(Illustr. 9)
(Illustr. 10)
7