The motor must be connected according to the electrical codes through a fused switch in order to
protect the motor against electrical or mechanical overload conditions. The overload of the motor
starter must be set at a level equal to the full load motor current listed on the motor nameplate.
Check the rotation connection before starting the pump, the correct direction of rotation is marked by
an arrow on the pump casing.
Avoid more than 10 switches per hour.
After electrical connections have been made, the rotation of the motor must be checked. If
backward, reverse any two leads of the three at the power connection.
1.5 Vacuum Connections
Use a pipe size that is at least the size of the pump inlet connections. Smaller lines result in a reduced
pump capacity.
Pumps operating in parallel on a common main line should have a manual or automatic operated
shut-off valve or positive action check valve, installed in the suction line adjacent to the pump
suction flange. The built-in anti-suck back valve should not be used as a shut-off valve for the
vacuum system. Remove the plastic protective cap from the inlet port prior to connection of pump to
the system.
Should process gas contain dust or other foreign particles, a suitable in line (inlet) filter should be
connected to the inlet port. Consult Eurovacuum for recommendations.
The vacuum piping should be designed to ensure that no liquids such a condensate or liquid carried
over from the process can reach the pump. If this possibility exists, a knock-out liquid separator
should be installed. Consult Eurovacuum for recommendations.
The following thread sizes are standard on the pumps
Pump Model
Inlet Size
EVDR-V010 & V016
G 1/2”
EVDR-V025 & V040
G 3/4”
Star Connection
High Voltage
L1
L2
L3
W2
U2
V2
U1
V1
W1
