Büchi Labortechnik AG
Help with faults | 10
Operation Manual Lyovapor™ L-200/L-200 Pro
89/100
Malfunction
Possible cause
Remedy
Vacuum is not
achieved
Vacuum system is leaking.
u
Clean the drain valve.
u
Check manifold valve. See
Chapter 10.3 "Locating
leaking manifold valve",
page 89
u
Check regulating valve and
aeration valve. See
Chapter 10.4 "Finding a
leaking regulating valve or
aeration valve", page 89
u
If necessary, replace tubing
and/or seals.
Vacuum pump is too weak.
u
Use a vacuum pump with a
capacity of at least 5m
3
/h.
u
Carry out maintenance work
according to the vacuum
pump manufacturer's
documentation.
Instrument is not
vented
Main valve is incorrectly con-
nected.
u
Connect the main valve
properly (see Chapter 5.3.3
"Fitting the advanced
vacuum control unit",
page 26).
10.3
Locating leaking manifold valve
Navigation path
➔
Start
Precondition:
R
The system does not evacuate to less than 0.1 mbar.
u
Navigate to the
Start
view via the navigation path.
u
Set the vacuum to 0.5 mbar.
u
Tap the function
[Start]
on the function bar.
u
Turn each manifold valve individually while checking the display to see if the
actual pressure changes.
u
If the vacuum decreases in the case of one of the manifold valves, then that valve
is the one that is leaking.
u
Tap the function
[Aerate]
on the function bar.
u
Replace the manifold valve concerned.
10.4
Finding a leaking regulating valve or aeration valve
Navigation path
➔
Start
