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9.3

The correct control voltage must be ensured according to the de-
vice information and/or the type plate.
For detailed information, refer to the appendix.

8.3 Thermal energy meter WMZ

8.3.1 General description

The thermal energy meter (WMZ 25/32) is used for measuring
the quantity of thermal energy supplied. It is available as an ac-
cessory. Due to the additional heat exchanger, two thermal en-
ergy meters are required for measuring the quantity of thermal
energy.
Sensors in the flow and return of the heat exchanger pipes and
an electronics module acquire the measured values and transmit
a signal to the heat pump manager, which, depending on the cur-
rent operating mode of the heat pump (heating/DHW/swimming
pool), totals the thermal energy in kWh and displays them in the
operating data and history menu.

NOTE

The thermal energy meter complies with the quality requirements of the
German market incentive programme subsidising efficient heat pumps.
The thermal energy meter is not subject to obligatory calibration, and can
thus not be used for the heating cost billing procedure!

8.3.2 Hydraulic and electrical

integration of the thermal
energy meter

The thermal energy meter requires two measuring devices for
data acquisition.



A measuring tube for the flow measurement
This must be installed in the heat pump flow (observe flow
direction).



A temperature sensor (copper pipe with immersion sleeve)
This must be installed in the heat pump return.

The installation locations for both measuring tubes should be as
close to the heat pump as possible in the generator circuit.
To avoid eddying effects which could lead to incorrect measure-
ments, there should be a gap of 50 cm between the measuring
devices and other installed components such as pumps or
valves.

Fig. 8.7:Hydraulic and electrical components of the thermal ener-
gy meter

9 Commissioning

9.1 General Information

To ensure that start-up is performed correctly, it should only be
carried out by an after-sales service technician authorised by the
manufacturer. This may be a condition for extending the guaran-
tee (see Warranty Service).

9.2 Preparation

The following items need to be checked prior to start-up:



The heat pump must be fully connected, as described in
Chapter 6.



The heat source system and the heating circuit must have
been filled and checked.



All valves that could impair proper flow in the well and heat-
ing circuits must be open.



The heat pump manager must be adapted to the heating
system in accordance with the controller’s operating instruc-
tions.

9.3 Start-up Procedure

The heat pump is started up via the heat pump manager.

ATTENTION!

The heat pump must be started up in accordance with the installation and
operating instructions of the

heat pump manager

If an overflow valve is fitted to assure the minimum heating water
flow rate, the valve must be set in accordance with the require-
ments of the respective heating system. Incorrect adjustment
can lead to faulty operation and increased energy consumption.
We recommend carrying out the following procedure to correctly
adjust the overflow valve:
Close all of the heating circuits that may also be closed during
operation (depending on the type of heat pump usage) so that
the most unfavourable operating state - with respect to the water
flow rate - is achieved. This normally means the heating circuits
of the rooms on the south and west sides of the building. At least
one heating circuit must remain open (e.g. bathroom).
The overflow valve should be opened far enough to produce the
maximum temperature spread between the heating flow and re-
turn flow listed in the table below for the current heat source tem-
perature. The temperature spread should be measured as close
as possible to the heat pump. The heating element of mono en-
ergy systems should be disconnected during start-up.