Installation; Mechanical Installation; Electrical Installation - Grundfos MAGNA3 Manual

MAGNA3

7. Installation

Mechanical installation

MAGNA3 is designed for indoor installation.
You must install the pump with horizontal motor shaft.
You can install the pump in horizontal as well as
vertical pipes.
A
C
Fig. 52 Installation positions
Arrows on the pump housing indicate the liquid flow
direction through the pump.
The control box must be in horizontal position with the
Grundfos logo in vertical position. See fig. 52.
You must install the pump in such a way that it is not
stressed by the pipes.
The pump may be suspended directly in the pipes,
provided that the pipes can support the pump.
Twin-head pumps are prepared for installation on a
mounting bracket or base plate.
To ensure adequate cooling of motor and electronics,
observe the following:
• Position the pump in such a way that sufficient
cooling is ensured.
• The temperature of the ambient air must not exceed
104 °F ° (40 °C).
Insulating shells
The insulating shells supplied with single-head
MAGNA3 pumps are for heating systems and must be
fitted as part of the installation. Note: Insulating shells
are not available for twin-head pumps.
Insulating shells increase the pump dimensions.
B
D

Electrical installation

The electrical connection and protection must be
carried out in accordance with local regulations.
• The pump must be connected to an external main
switch.
• The pump must always be correctly grounded.
• The pump requires no external motor protection.
• The pump incorporates thermal protection against
slow overloading and blocking.
• When switched on via the power supply, the pump
will start pumping after approximately 5 seconds.
Note: The number of starts and stops via the power
supply must not exceed four times per hour.
The pump has a digital input that you can use for
external control of start/stop without switching the
power supply on and off.
Make the pump mains connection as shown in the
diagrams on the following pages.
If rigid conduit is to be used, the hub must be
connected to the conduit system before it is connected
to the terminal box of the pump.
Cables
Use screened cables for the external on and off switch,
the digital input, sensor and setpoint signals.
All cables used must be heat-resistant up to at least
167 °F (75 °C.)
All cables used must be installed in accordance with
the National Electrical Code, or in Canada, Canadian
Electrical Code, and state and local regulations.
Additional protection
Ground fault circuit interrupter (GFCI)
Use a suitable type of GFCI capable of handling
ground fault currents with a DC content (pulsating DC).
If the pump is connected to an electrical installation
where a GFCI is used for additional protection, this
GFCI must be able to trip when ground fault currents
with DC content occur.
7
37