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7.4
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 either
a dual differential pressureless manifold or an overflow valve.
The procedure for adjusting an overflow valve is described in the
Chapter Start-Up. When the minimum flow rate is undershot
drastically, the plate steel exchanger in the refrigerating 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
The temperature sensors to be connected to the heat pump
manager must correspond to the sensor characteristic curve
illustrated in Fig.7.1. The only exception is the external
temperature sensor included in the scope of supply of the heat
pump (see Fig.7.2)
Fig. 7.1:Sensor characteristic curve NTC-10 l
Fig. 7.2:Sensor characteristic curve, standardised NTC-2 ac-
cording to DIN 44574
External temperature sensor
Temperature in °C
-20
-15
-10
-5
0
5
10
Standard 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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