Elmo Rietschle V-VTN 16/26/41 - Manual (Page 16)

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Installation
5.3 Connecting pipes
a) Vacuum connection at (Fig. 2/A).
NOTICE
Material damage resulting from the forces and
torques of the pipes on the unit being too high.
screw pipes in by hand.
The pumping capacity of the vacuum pump
is reduced if the suction pipe is too narrow
and/or too long.
b) Check to ensure the suction pipe is connected
correctly.
NOTICE
Length of the connection pipes
With connection pipes that have the same pipe
cross section as the machine connection and are
more than 3m long, a non-return valve especially
for the purpose must be installed in order to avoid
reverse operation when the machine has stopped.
5.4 Control and relief valve
The vacuum can be set by turning the control knob
(Fig. 2/C) as shown on the symbol fi tted to the but-
ton.
NOTICE
Do not operate without the standard control
and relief valve.
If the permissible vacuum is exceeded (see data
plate) the machine may be damaged.