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3.3
3.3 Thermal energy meter WMZ
3.3.1
General Description
The thermal energy meter (WMZ 25/32) on reversible heat
pumps with an additional heat exchanger is for calculating
precisely the quantity of thermal energy given off by the
additional heat exchanger. It is available as an accessory.
Sensors in the flow and return of the addition heat exchanger line
and an electronics module acquire the measured values and
transmit a signal to the heat pump manager, which, depending
on the current operating mode of the heat pump (domestic hot
3.3.2
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 additional heat exchanger's
heat pump flow, upstream of the branch for domestic hot
water preparation (observe flow direction).
A temperature sensor (copper pipe with immersion sleeve).
This must be installed in the heat pump return of the
additional heat exchanger.
Fig. 3.7:
Hydraulic and electrical components of the thermal energy meter
EN-6
water/swimming pool), totals the thermal energy in kWh and
displays it 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!
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.
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