Büchi Labortechnik AG
Help with faults | 10
Operation Manual Lyovapor™ L-300/L-300 Pro
105/118
Malfunction
Possible cause
Remedy
Instrument is not
vented
The connection for the gas
supply is blocked.
u
Make sure that gas is able to
flow into the instrument
through the gas supply
connection.
u
Clean the air filter (option).
One of the ice con-
densers is overfilled
with ice
The instrument only uses one
ice condenser.
u
See Chapter 10.4 "Manually
defrosting ice condenser",
page 105
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
Manually defrosting ice condenser
NOTICE
Do not use force to remove the ice from the ice condenser.
Opening intermediate valve
Navigation path
➔
Configuration
➔
Service
➔
Ice condenser
Precondition:
R
The instrument is in standby mode. See Chapter 7.9.6 "Shutting down the
instrument", page 76
u
Navigate to the
Ice condenser
view via the navigation path.
u
Open the intermediate valve of the ice condenser concerned.
