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Building Technologies
Electronic Heat Meter
CE1N5331en
HVAC Products
03.11.2005
Type list – Accessories
Accessories
Description, scope of delivery
Type Ref.
Spacer
For installation length of 80 mm, external thread ¾”
WFZ.R80
Spacer
For installation length of 110 mm, external thread ¾”
WFZ.R110
Spacer
For installation length of 130 mm, external thread 1”
WFZ.R130
Ball valve
Internal thread ½”, with sensor seat
WFZ.K15
Ball valve
Internal thread ¾”, with sensor seat
WFZ.K18
Ball valve
Internal thread 1”, with sensor seat
WFZ.K22
Tee
Internal thread ½”, with immersion sleeve M10×1
WFZ.T16
Tee
Internal thread ¾”, with immersion sleeve M10×1
WFZ.T19
Tee
Internal thread 1”, with immersion sleeve M10×1
WFZ.T22
Threaded joints
Profipress G-Adapter with SC-Contur, gunmetal, female thread, 15× ½”
WFZ.P2
Threaded joints
Profipress G-Adapter with SC-Contur, gunmetal, female thread, 18× ¾”
WFZ.P2-1
Parameterisation and
diagnosis tool
PC-software tool (additional tool required: with USB-Tool set
WHZ3.USB or IrDA interface F12150-2018 on Com (RS232) port)
ACT20
Order
When ordering, specify the type reference according to the type overview. The stan-
dard electronic Siemeca
TM
heat meter has an IrDA interface.
If a due date other than the 31 December is desired, the desired month should also be
entered in addition to the type reference (the last day of a month is always the due
date).
Order model for a heat meter with
110
mm installation length and 30 April as due date:
WFM407.B113, Due date: April
Technology
The meter operates according to the single-jet measuring principle. The water flows
against an impeller; its speed is scanned electronically and without a magnetic field.
The temperatures in the flow and return are measured with immersion sensors Pt1000
(platinum measuring elements).
The heat meter is equipped either for installing in the return or in the flow. Please select
the corresponding meter from the type list for the place of installation.
The flow is continuously measured in the calculator and at least once every minute the
flow and return temperature. A microprocessor in the calculator determines the differ-
ence in temperature and calculates the consumed quantity of heat based on the aver-
age flow and the heat coefficient.
The heat consumption values are totalled continuously. The current state is saved on
the next due date at 24.00 h.
The due date can be factory-programmed; the standard due date is entered as
31 December (compare «Order»)
When the annual consumption is saved, the heat meter simultaneously calculates a
control number. After special parameterisation with ACT20 service software the check-
sum is readable. Self-readers must inform the utility company/property management of
this control number and the due date value that has been read out so that they can
check that the display has been read correctly.
The due date value remains saved for one year.
Measuring principle
Determination of heat
consumption
Saving of consump-
tion values