Heat Meter (Option) - Worcester Greenstar HIU Installation And Maintenance Instructions Manual

Commissioning
7.5

Heat meter (Option)

The energy meter uses an ultrasonic flow sensor to record all billing-
relevant data for measuring the energy consumed by heating and hot
water. The data read out is displayed on different loops in the display.
The seal on the energy meter must not be damaged! A damaged seal will
result in immediate invalidation of the factory warranty and verification.
The cables supplied with the meter must neither be shortened, extended
nor changed in any other way.
Legal regulations and operating instructions for the use of energy meters
must be observed! The installation must only be carried out by a
specialist energy meter installation and electrical company. The
personnel must be trained in the installation and handling of energy
meters and electrical devices as well as the applicable guidelines.
Medium: Water, according to CEN/TR 16911. If water additives are used
(e.g. corrosion protection), the user must make sure that the corrosion
resistance is adequate.
If the flow sensor is insulated with the pipeline, the calculator must be
accessible.
Sensor
The connecting cables must not be shortened or extended!
Communication general
Communication modules must be secured so that opening of meters is
only possible by destroying the securing points (e.g. with locking
varnish).
Communication via radio
The integrated radio function is for communication via 868 MHz or 434
MHz OMS/M-Bus (Open Metering System) and has the following
specifications:
• The module transmits every 8 ... 256 s (send period max. 0.1 % of
duty cycle (min. 8s); variable, depending on protocol length and
programming).
• The communication always transfers the currently measured data.
• Transmission frequencies: 434 MHz, transmission power (EN 300
220-2 V3.2.1): 10mW e.r.p. 868 MHz, transmission power (EN 300
220-2 V3.2.1): 25mW e.r.p.
• Encrypted protocol: Real Data Radio or Open Metering Standard.
• Reading modes: Walk-By, Drive-By, Fixed-Network
• For problematic radio installations (shielding) the external wireless
module set can also be used.
M-Bus Communication module
The wired M-Bus communication module is a serial interface for
communication with external M-Bus monitoring devices and billing
systems supporting connection via the M-Bus standard.
• The connection is not polarity-sensitive and is electrically isolated. M-
Bus protocol standardised according to EN 1434;
• 300 or 2400 baud (auto baud detect).
• Connection for 2 x 2.5 mm².Power consumption: One M-Bus load
▶ Connect the heat meter M-Bus cable and cable used to connect to the
M-Bus compatible external equipment into the connector block [1] in
the control unit.
16
1
Fig. 35 M-Bus connection
Operation
Pressing the button awakens the meter from power saving mode and
activates the display.
• Short button press (< 3 seconds): shift within one loop.
• Long button press (> 3 seconds): switches to the next loop.
• If the button is not pressed for more than 4 minutes, the controller
switches off and switches to power save mode.
Display
V
max
-V
1 2 3 4 5 6
Fig. 36 Display
[1] Quadrant display
[2] Loop number
[3] Tariff loop
[4] Fault symbol
[5] Calibrated value
[6] Maximum value
[7] Button
Menu structure - display sequences
The energy meter has 5 different display sequences (loops). The loops
are labelled 1 to 5 in the display.
Window 1
1.1 Accumulated energy
1.2 Volume
1.3 Accumulated cooling energy (only for cooling tariff)
1.4 Flow
1.5 Power
1.6 Flow/return flow temperature
1.7 Differential temperature
1.8 Operating days
1.9 Error status
1.10 Display test
Table 15 Loop 1- main loop
MBtm
x100
GPM GJgal
7
00100 4510 8-01
Greenstar – 6721852556 (2022/11)