EN-6
452162.66.15 · FD 9701
English
HWK 230 Econ5S
7.2 Heating system connection
The heating system connections on the hydro tower have a 1"
flat-sealing external thread. A spanner must be used to firmly grip
the transitions when making the connections.
A dimensionally stable ¾" plastic hose (inner diameter approx.
19 mm) must be affixed to the hose nozzle, e.g. with a pipe
clamp, and guided outside the building in the area behind the
heat pump return.
Before the heating water system is connected, it must be flushed
to remove any impurities, residue from sealants, etc. Any accu-
mulation of deposits in the liquefier may cause the heat pump to
completely break down. For systems in which the heating water
flow can be shut off via radiator or thermostat valves, the infinitely
adjustable circulating pump carries out a demand-related adjust-
ment of the delivery height. The initial filling and start-up must be
carried out by an authorised specialist company. The entire sys-
tem, including all factory-assembled components, should be in-
spected to ensure that everything is working properly and that
there is no leakage.
The buffer tank and heating system must be filled via the filling
and drain cock on the hydro tower. The cylinder must be purged
using the air-relief cock on the upper pipe connection to the cyl-
inder.
A suitable purging facility must be installed in the heating circuit
on site.
It is additionally recommended that a shut-off device be installed
in the heating return before integration into the HWK is carried
out. This shut-off device should prevent excessive heating water
loss if it becomes necessary to replace the "circulating pump"
(M16).
Where necessary, heating connection pipes for the heat pump
can also be laid underneath the cylinder, at its rear.
It is possible to connect a second or third heating circuit (acces-
sory component, manifold bar VTB).
The heating circuits are then installed on site outside of the HWK
with heat circulating pump M13 / M15.
NOTE
If the pipes are more than 10 m long, the free compression values stated
in the device information must be observed (minimum pipe diameter for
volume flows of more than 1.5 m³/h: DN 32)
Minimum heating water flow
The minimum heating water flow of the heat pump is ensured by
the the dual differential pressureless manifold in all operating
states of the heating system.
A method of manual drainage must be provided for heat pumps
which are exposed to frost. The frost protection function of the
Heat pump manager is active whenever the heat pump manager
and the heat circulating pump are ready for operation. The sys-
tem has to be drained if the heat pump is taken out of service or
if a power failure occurs. The hydraulic network should be oper-
ated with suitable frost protection if heat pump systems are im-
plemented in buildings where a power failure cannot be detected
(vacation homes etc.).
7.3 Temperature sensor
7.3.1 Hydro tower
The following temperature sensors are already installed or must
be installed additionally:
External temperature sensor (R1) supplied (NTC-2)
Return temperature (R2.1) installed (NTC-10)
Domestic hot water temperature (R3) installed (NTC-10)
7.3.2 Sensor characteristic curves
The temperature sensors to be connected to the heat pump ma-
nager must correspond to the sensor characteristic curve illustra-
ted in Fig.7.1 on pag. 6. The only exception is the external tem-
perature sensor included in the scope of supply of the heat pump
(see Fig.7.2 on pag. 6)
Fig. 7.1:Sensor characteristic curve NTC-10
Fig. 7.2:Sensor characteristic curve, NTC-2 according to
DIN 44574 External temperature sensor
Temperature in °C
-20
-15
-10
-5
0
5
10
NTC-2 in k
Ω
14.6
11.4
8.9
7.1
5.6
4.5
3.7
NTC-10 in k
Ω
67.7
53.4
42.3
33.9
27.3
22.1
18.0
15
20
25
30
35
40
45
50
55
60
2.9
2.4
2.0
1.7
1.4
1.1
1.0
0.8
0.7
0.6
14.9
12.1
10.0
8.4
7.0
5.9
5.0
4.2
3.6
3.1
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