Cleaning and maintenance
20901118_EN-US_PC301x VARIO select Serie_V1.3_100720
53
7.2.3 Clean or replace PTFE hoses
Maintenance provides the opportunity to check the components
of the pumping unit, including the hoses.
ð
Clean the inside of very dirty molded hoses, e.g., using a
pipe cleaner or similar.
ð
Replace brittle and defective molded hoses.
7.3 Vacuum pump maintenance
7.3.1 Maintenance items
Positions to be maintained
-> Example
Pump head mainte-
nance
Description
Maintenance items and sequence
1
EK pressure relief valve in silicone #20638821
2
Suction/pressure distributor (behind separator flask)
3
Right pump head pair
4
Bottom pump head pair
5
Left pump head pair
6
Top pump head pair
Straightforward maintenance due to split work steps. Ob-
serve the recommended sequence in the maintenance items
table.
ð
On removal, check the pressure relief valve on the
EK.
ð
Option: Replace the O-ring and pressure relief valve
in the suction/pressure distributor.