Lowara e-HM series, Installation, Operation And Maintenance Manual, Page: 22 / 44

– A foot valve that guarantees full opening (full section)
– A filling on-off valve to facilitate the removal of the air and priming.
4.4 Electrical connection
DANGER:
All the hydraulic and electrical connections must be completed by a technician
possessing the technical-professional requirements outlined in the current regulations.
DANGER: Electrical hazard
Before starting work, check that the unit is unplugged and that the pump unit, the control
panel and the auxiliary control circuit cannot restart, even unintentionally.
4.4.1 Ground
DANGER: Electrical hazard
Always connect the external protection conductor (ground) to the ground terminal before
attempting to make any other electrical connections.
DANGER: Electrical hazard
Connect all the electrical accessories of the pump unit and motor to the ground.
DANGER: Electrical hazard
Check that the external protection conductor (ground) is longer than the phase
conductors; In case of accidental disconnection of the unit from the phase conductors, the
protection conductor must be the last one to detach itself from the terminal.
DANGER: Electrical hazard
Install suitable systems for protection against indirect contact, in order to prevent lethal
electric shocks.
4.4.2 Guidelines for electrical connection
1. Check that the electrical leads are protected against:
– High temperature
– Vibrations
– Collisions.
2. Check that the power supply line is provided with:
– A short circuit protection device of appropriate size
– A mains isolator switch with a contact gap of at least 3 mm.
4.4.3 Guidelines for the electric panel
NOTICE:
The electric panel must match the ratings on the unit data plate. Improper combinations
could damage the motor.
4 Installation
20 e-HM Series Installation, Operation and Maintenance Manual