Drain Holes; Electrical Installation; Mains Supply - Grundfos Hydro Multi-E Series Installation And Operating Instructions Manual

6.2.1 Motor cooling
Leave at least 2 inches (50 mm) between the end of the fan cover
and a wall or other fixed objects. See fig. 5.
Fig. 5 Minimum distance (D) from the motor to a wall or other
fixed objects

6.3 Drain holes

When the motor is installed in moist surroundings or areas with
high humidity, the bottom drain hole must be open. If the humidity
is constantly above 85 %, open the drain holes in the drive-end
flange. The enclosure class of the motor will then be lower. This
helps prevent condensation in the motor as the motor becomes
self-venting, and it allows water and humid air to escape.
The motor has a plugged drain hole on the drive side. You can
turn the flange 90 ° to either side or 180 °.
B3 B14
Fig. 6 Drain holes

6.4 Electrical installation

Carry out the electrical connection according to local regulations.
Check that the supply voltage and frequency correspond to the
values stated on the nameplate.
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply and wait at least five
minutes before you make any connections in the
breaker cabinet or terminal boxes. Make sure that
the power supply cannot be accidentally switched
on.
- Connect the motor to ground and protect against
indirect contact according to local regulations.
- Use skilled personnel when installing the system.
If the power supply cable is damaged, it must be replaced by the
manufacturer, the manufacturer's service partner or a similarly
qualified person.
The user or the installer is responsible for the installation of
correct earthing and protection according to local regulations. All
operations must be carried out by a qualified electrician.
The pump system must be stationary and installed permanently.
Furthermore, connect the pump system permanently to the power
supply.
Ground connection should be ensured by running duplicate
conductors.
The system should be installed according to National Electrical
Code (NEC) requirements.
D
B5
6.4.1 Protection against electric shock, indirect contact
WARNING
Electric shock
Death or serious personal injury
- Connect the motor to ground and protect against
indirect contact according to local regulations.
Protection against mains voltage transients
The motor is protected against mains voltage transients in
accordance with IEC 61800-3.
Motor protection
The motor requires no external motor protection. The motor
incorporates thermal protection against slow overloading and
blocking.
6.4.2 Insulation resistance
Do not measure the insulation resistance of motor
windings or an installation incorporating motors with
integrated frequency converters using high-voltage
megger as this may damage the built-in electronics.

6.5 Mains supply

Check that the supply voltage and frequency correspond to the
values stated on the nameplate.
Use dedicated IT network motors if the pump system
is supplied through an IT network. Contact Grundfos.
The wires in the breaker cabinet must be as short as possible,
except for the separated earth conductor which must be so long
that it is the last one to be disconnected in case the cable is
inadvertently pulled out of the cable entry.
For maximum feeder overcurrent protective device (FOPD)
ratings, see section 25.1 Supply
L1
FOPD
L2
PE
Installation in building
Fig. 7 Example of a mains-connected Hydro Multi-E with
feeder overcurrent protective device (applies only for
systems with single-phase motors)
voltage.
Breaker cabinet
7