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Minimum heating water flow rate
The minimum heating water flow rate through the heat pump
must be assured in all operating states of the heating sys-
tem. This can be accomplished, for example, by installing a dual
differential pressureless manifold. When the minimum flow rate
is undershot drastically, the plate steel exchanger in the refriger-
ating cycle can freeze, which can lead to total loss of the heat
pump.
NOTE
The use of an overflow valve is only recommended for panel heating and
a max. heating water flow of 1.3 m³/h. System faults may result if this is
not observed.
Antifreeze
A method of manual drainage (see illustration) should be pro-
vided for heat pumps which are exposed to frost. The antifreeze
function of the heat pump manager is active whenever the heat
pump manager and the heat circulating pump are ready for oper-
ation. If the heat pump is taken out of service or in the event of a
power failure, the system has to be drained. The heating circuit
should be operated with a suitable antifreeze if heat pump sys-
tems are implemented in buildings where a power failure can not
be detected (holiday home).
7.4 Temperature sensor
The following temperature sensors are already installed or must
be installed additionally:
External temperature (R1)
Temperature 1st, 2nd and 3rd heating circuit
(R2, R5 and R13)
Flow temperature (R9)
Hot water temperature (R3)
Temperature of renewable heat accumulator (R13)
7.4.1 Sensor characteristic curves
-20
-15
Temperature in °C
Standard NTC-2 in
14.6
11.4
k
NTC-10 in k
67.7
53.4
15
20
25
30
35
2.9
2.4
2.0
1.7
1.4
14.9
12.1
10.0
8.4
7.0
The temperature sensors to be connected to the heat pump
manager must correspond to the sensor characteristic curve
illustrated in Fig.7.1 on pag. 7. The only exception is the external
temperature sensor included in the scope of supply of the heat
pump (see Fig.7.2 on pag. 7)
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-10
-5
0
5
10
8.9
7.1
5.6
4.5
3.7
42.3
33.9
27.3
22.1
18.0
40
45
50
55
60
1.1
1.0
0.8
0.7
0.6
5.9
5.0
4.2
3.6
3.1
Fig. 7.1:Sensor characteristic curve NTC-10 l
Fig. 7.2:Sensor characteristic curve, standardised NTC-2 according to
DIN 44574
External temperature sensor
7.4.2 Mounting the external temperature
sensor
The temperature sensor must be mounted in such a way that all
weather conditions are taken into consideration and the
measured value is not falsified.
On the external wall of a heated room used as living space,
if possible on the north or north-west side of the building
Do not install in a "sheltered position" (e.g. in a wall niche or
under a balcony)
Not in the vicinity of windows, doors, exhaust air vents,
external lighting or heat pumps
Not to be exposed to direct sunlight at any time of year
Sensor lead: Max. length 40 m; min. core cross-section
0.75 mm²; external diameter of the cable 4-8 mm.
7.4
EN-7
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