Kamstrup MULTICAL 401, Technical Description

Page: 23 / 75

TECHNICAL DESCRIPTION MULTICAL
®
401
5512-091 GB/02.2008/Rev. J1
23
6 Installation
6.1 Installation requirements
Before mounting MULTICAL
®
401, flush the system thoroughly with a fitting pipe mounted instead of the energy
meter. Then remove the protection caps from the input and the output of the meter and mount it by means of
glands and gaskets. Always use original new fibre gaskets.
If other types of glands or extension nipples are used, it must be checked that the thread length of the glands
does not prevent the sealing surface from being sufficiently tightened.
Correct position of the flow sensor, in flow or return pipe, appears from the type sign on the side of the meter, and
the flow direction is shown by an arrow cast in the flow part.
In order to prevent cavitation the working pressure at ULTRAFLOW
®
must be min. 1.5 bar at qp and min. 2.5 bar at
qs. This applies to temperatures up to approx. 80°C.
When the installation is complete, the water flow can be turned on. The valve on the inlet side must be opened
first.
ULTRAFLOW
®
must not be exposed lower pressure than the ambient pressure (vacuum).
Permitted operating conditions
Ambient temperature: 0…55
°
C (indoors)
Medium temperature: 15…130
°
C with the calculator mounted on the wall
15…90
°
C with the calculator mounted on the flow sensor
System pressure: 1.5…16 bar for thread meters
1.5…25 bar for flange meters
EMC conditions
MULTICAL
®
401 is intended for installation in residential houses as well as in light industrial environments and
the meter is CE marked according to EN 1434 type test in environment class A and the low-voltage directive.
Control cables from the meter must be drawn at a minimum distance of 25 cm from other installations.
Electrical installations
MULTICAL
®
401 is available for both 24 VAC and 230 VAC mains supply. The mains connection is made with a 2
wire cable, without earth connection.
Use a strong connection cable with an outside diameter of max. 7 mm and ensure a correct cable retainer in the
meter. Max. fuse before the meter is 6 A (when using 2 x 0.75 mm
2
connection cable).
National regulations for electric installations must always be met, including e.g. a cable cross section in relation
to the fuse size of the installation (short-circuit current).
For installations made in Denmark, the information from ”Elråd” concerning installations for mains supplied heat
meters applies for both direct 230 VAC supplied meters as for 24 VAC meters supplied via a safety transformer.
Service
When the meter has been mounted in the heating system neither welding nor freezing is permitted. Before
starting such work dismount the meter from the heating system and disconnect the power supply, if any.
In order to facilitate possible service of the meter, closing valves ought to be mounted on both sides of the meter.
Under normal operating conditions no strainer is required in the front of the meter.