Installation and connection
Diaphragm vacuum pump N 89/N 811/N 814/N 815
20
Translation of original Operating and Installation Instructions, english, KNF 121242-121509 04/20
6.3. Pneumatic connection
CAUTION
Personal injury or damages to property by ejected
plugs
If the plug at the pressure side of the pump hasn’t
been removed, it could be ejected because of the
overpressure during operation.
Remove the plug during the installation.
Only connect components to the pump which are designed for
the pneumatic data of the pump (see Chapter 4, Technical Da-
ta).
If the pump s used as a vacuum pump, safely discharge the
pump exhaust at the pump’s pneumatic outlet.
KNF recommends mechanically disengaging the pump from
the piping system. This can be achieved with flexible tubing or
pipes, for example. This will avoid transferring to the system
any pump oscillations that may arise.
Connecting pump
A marking on the pump head shows the direction of flow.
Confusion between suction and pressure sides can lead to
breakage of connected components on the suction and pres-
sure sides.
1. Remove the protective plugs from the hose connection
threads.
2. The accessories silencer, filter, and hose connectors (where
applicable) are screwed into the port threads.
Mount the silencer at the pressure side if necessary.
3. Connect the suction line and pressure line (see Chapter 4,
Tab. 11 for mounting dimensions).
4. Lay the suction and pressure line at a downward angle to pre-
vent condensate from running into the pump.
Connected
components
Pump exhaust
Disengaging
Содержание N 811
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