Technical data
78 | Project planning manual for heat pumps for heating and domestic hot water preparation | 01.2012 www.dimplex.de
7.3 Heat pump manager
7.3 Thermal energy meter WMZ
NOTE
The high-efficiency heat pumps come with an integrated thermal energy
meter as standard. Measurement is carried out via pressure sensors in
the heating circuit, which are directly linked to the heat pump manager
WPM EconPlus.
General description
The thermal energy meter (WMZ 25/32), for connection to the
heat pump manager, is used for the measurement and evalua-
tion of the thermal energy emitted by the heat pump.
Sensors in the flow and return of the heating water pipe 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/domestic hot
water/swimming pool), totals the thermal energy in kWh and dis-
plays them in the menu and history.
NOTE
The thermal energy meter complies with the quality requirements of the
German market incentive programme subsidizing 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!
7.3.1 Hydraulic and electrical integration of the thermal energy meter
The thermal energy meter requires two measuring devices for
data acquisition.
The measuring tube for the flow measurement
This must be installed in the heat pump flow upstream of the
branch for domestic hot water preparation (observe flow di-
rection).
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. 7.10: Hydraulic and electrical components of the thermal energy meter
X8/X11
T
N1-B2
(R2)
N1-B1
(R1)
T
WPM
WP
N1
WMZ
In the heating flow
In the heating return
Thermal energy meter casing - electronics
(WPM2006)
230V /50Hz L /N /PE
In the heating return
ID 12
New software
required!
Version H_H_61
Flow
Return
24 V AC