Radio Communication; Insulating Shells; Check Valve; Closed-Valve Operation - Grundfos MAGNA3 D Installation And Operating Instructions Manual

7.6 Radio communication

GRUNDFOS HOLDING A/S
RADIOMODULE 2G4
CONTAINS FCC ID: OG3-RADIOM01-2G4
CONTAINS IC: 10447A-RA2G4M01
This device complies with part 15 of the FCC Rules and Licence
exempts RSSs of IC rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation of the device.
USA, CLASS B product (domestic use / public access)
This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
communications. However, there is no guarantee that
interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for
help.
Canada
Complies with the Canadian ICES-003 Class B specifications.
This Class B device meets all the requirements of the Canadian
interference-causing equipment regulations.
Intended use
This pump incorporates a radio for remote control.
The pump can communicate with Grundfos GO and with other
MAGNA3 pumps of the same type via the built-in radio.
20

7.7 Insulating shells

Insulating shells are available for single-head pumps only and are
supplied with pumps for heating systems. The fitting of insulating
shells increases the pump dimensions.
Limit the heat loss from the pump housing and
pipes. See section 4.3 Insulating shells and
4.4 Mechanical installation.

7.8 Check valve

If a check valve is fitted in the pipe system, make sure that the set
minimum outlet pressure of the pump is always higher than the
closing pressure of the valve. See fig. 21. This is especially
important in proportional-pressure control mode with reduced
head at low flow.
Fig. 21 Check valve

7.9 Closed-valve operation

MAGNA3 pumps can operate at any speed against a closed valve
for several days without damage to the pump. However, Grundfos
recommends to operate at the lowest possible speed curve to
minimize energy losses. There are no minimum flow
requirements.
Do not close inlet and outlet valves simultaneously,
always keep one open when the pump is running.
Media- and ambient temperatures must never
exceed the specified temperature range.