MULTICAL® 403
Kamstrup A/S · Technical description · FILE100000166_B_EN-55121689_M1_07.2023
4 Installation
4.1 Installation requirements
Prior to installation of MULTICAL® 403 the heating system should be flushed while a fitting piece replaces the meter.
Remove the adhesive wafers from the flow sensor’s inlet and outlet and mount the flow sensor with
couplings/flanges. New fibre gaskets in original quality must be used.
If other couplings than the original ones from Kamstrup A/S are used you must make sure that the threaded lengths
of the couplings do not prevent proper tightening of the sealing surface.
The meter is configured for mounting of flow sensor in inlet or outlet before commissioning, see paragraph 6.3
about ”SETUP loop”. The flow direction is indicated by an arrow on the flow sensor.
In order to avoid cavitation the back pressure at the flow sensor (the pressure at the flow sensor outlet) must be
minimum 1 bar at q
p
and minimum 2 bar at q
s
, however 1,5 and 2,5 bar respectively for q
p
15 flow sensor. This
applies to temperatures up to approx. 80 °C. See paragraph 4.5 regarding operating pressure.
When the installation has been completed, water flow can be turned on. The valve on the flow sensor's inlet side
must be opened first.
The flow sensor must not be exposed to lower pressure than ambient pressure (i. e. a vacuum).
Permissible operating conditions
Ambient temperature: 5…55 °C (indoors). Max. 30 °C for optimum battery lifetime.
Medium temperature of heat meter: 2…130 °C with calculator mounted on a wall
15…90 °C with calculator mounted on flow sensor
Medium temperature of cooling meter: 2…50 °C with calculator mounted on a wall
Medium temperature of heat/cooling meter: 2…130 °C with calculator mounted on a wall
System pressure: 1,0…25 bar for threaded meters
(See paragraph 4.4) 1,0…25 bar for flange meters, however ≥ 1,5 bar for q
p
15
Electric installation
MULTICAL® 403 is available with either 24 VAC, 230 VAC or 24 VAC/VDC supply modules. The supply modules are
connected to mains using two-wire cable without protective earth.
Use a strong connection cable with an outer diameter of max. 5-8 mm and ensure correct cable stripping and cable
relief in the meter. It must be ensured that the entire installation complies with current rules. Supply cable to the
meter and/or safety transformer must never be protected by a larger fuse than allowed. In case of doubt, it is
recommended to seek counselling from a certified electrician.
See paragraph 10 for more information about supply
possibilities.
Service
Neither welding nor freezing is allowed whilst the meter is mounted. Before starting such work, the meter must be
dismounted. If the meter is mains supplied, the supply must be switched off.
In order to facilitate replacement of the meter, closing valves should be mounted on both sides of the meter.
Under normal operating conditions no pipe strainer is required in front of the meter.
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