ISTRUZIONI ORIGINALI
TECHNICAL INFORMATION
20/43
87-900-136-01
B
SECTION II
INSTALLATION AND OPERATION
Assembling
If the pump is supplied without any electrical mo-
tor, install a motor whose characteristics are the
same as stated on the technical sheet, construc-
tive form IM B5.
WARNING!
Check that the distance between the two coupling
halves is:
−
Type 1: B = 3.5 ±1 mm (see figure below)
−
Type 2: B = 3.5 ±1 mm (see figure below).
Type 1
Type 2
Gas Ballast
Pumps of the MS series are fitted with a gas bal-
last valve in order to exhaust any water vapour
present in the rotor. When the pump operates with
the gas ballast open, please follow these instruc-
tions:
•
Position the selector switch in the flow direc-
tion (circuit is open).
•
The ultimate pressure in this kind of operation
is better than 0.7 mbar.
When water vapour has been removed and the
pump original conditions are to be reset:
•
Position the selector switch crossway with re-
spect to the flow (circuit is closed)
•
In this kind of operation the ultimate pressure
is better than 0.1 mbar.
Positioning
−
The pump must be installed in a protected area
(see “SAFETY PRECAUTIONS”).
−
It must be fastened with support feet on hori-
zontal surface.
−
It must be accessible for correct ands easy
maintenance, by respecting the minimum dis-
tances from possible obstructions (see follow-
ing figure and table).
Closed position
Open position
A
D
C
B
A
