Brochure

Installation
MAGNA3
7
14
7. Installation
Mechanical installation
The MAGNA3 is designed for indoor installation.
The pump must be installed with horizontal motor
shaft.
The pump may be installed in horizontal as well as
vertical pipes.
Fig. 10 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. 10.
This is described in the installation and operating
instructions.
The pump must be installed in such a way that it is not
stressed by the pipework.
The pump may be suspended direct in the pipes,
provided that the pipework 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,
the following must be observed:
• 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 should
be fitted as part of the installation.
Insulating shells for air-conditioning and cooling
systems are available as an accessory.
For cooling systems, see section Insulating for
air-conditioning and cooling systems, page 57.
Note: Insulating shells are not available for twin-head
pumps.
Electrical installation
The electrical connection and protection should be
carried out in accordance with local regulations.
• The pump must be connected to an external mains
switch.
• The pump must always be correctly earthed.
• 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 approx. 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 can be used for
external control of start/stop without switching the
power supply on/off.
The pump mains connection must be made as shown
in the diagrams on the following pages.
Cables
Use screened cables for external on/off switch, digital
input, sensor and setpoint signals.
• All cables used must be heat-resistant up to at least
+185 °F (+85 °C).
• All cables used must be installed in accordance with
EN 60204-1 and EN 50174-2:2000.
TM05 2866 0712
http://GRUNDFOS.COM/MANUAL-MAGNA3