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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 system.
This can be accomplished, for example, by installing either a
dual differential pressureless manifold or an overflow valve. The
procedure for setting an overflow valve is described in the
chapter "Start-up". When the minimum heating water flow rate
is undershot, the plate heat exchanger in the refrigeration cir-
cuit can freeze, which can lead to total loss of the heat pump.
The nominal flow rate is specified depending on the max. flow
temperature in the device information and must be taken into
account during planning. With design temperatures below 30 C
in the flow, the design must be based on the max. volume flow
with 5 K spread for A7/W35.
The specified nominal flow rate (See "Device information" on
page 18.) must be guaranteed in every operating status. An in-
stalled flow rate switch is used only for switching off the heat
pump in the event of an unusual and abrupt drop in the heating
water flow rate and not to monitor and safeguard the nominal
flow rate.
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 op-
eration. When decommissioning the heat pump, or in the event
of a power failure, the system must be drained through the in-
dicated points (see illustration); it may be necessary to purge
the system with compressed air. If heat pump systems are im-
plemented in buildings where a power failure cannot be de-
tected (holiday homes etc.), the heating circuit should be oper-
ated with suitable frost protection.
1
2
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7.5 Temperature sensor
Depending on the heat pump type used, the following temper-
ature sensors are already installed or must be additionally
mounted:
Outside temperature (R1)
Temperature 1st, 2nd and 3rd heating circuit (R2, R5 and
R13)
Flow temperature (R9), as a frost protection sensor in the
case of air-to-water heat pumps
Outlet temperature of the heat source in the case of brine-
to-water and water-to-water heat pumps
Domestic hot water temperature (R3)
Temperature of renewable thermal storage (R13)
7.5.1 Sensor characteristic curves
Temperature in °C
NTC-2 in k
NTC-10 in k
15
20
2.9
2.4
14.9
12.1
The temperature sensors to be connected to the heat pump
manager must correspond to the sensor characteristic curve
illustrated in Fig.7.3 on pag. 11. The only exception is the
external temperature sensor included in the scope of supply of
the heat pump (see Fig.7.4 on pag. 11)
70
60
50
40
30
20
10
0
-20 -15 -10 -5
Fig. 7.3:Sensor characteristic curve NTC-10
20
18
16
14
12
10
8
6
4
2
0
-20 -15 -10 -5
Fig. 7.4:Sensor characteristic curve, NTC-2 according to DIN 44574 Ex-
ternal temperature sensor
452169.66.06b · FD 0411
-20
-15
-10
-5
14.6
11.4
8.9
7.1
67.7
53.4
42.3
33.9
25
30
35
40
45
2.0
1.7
1.4
1.1
1.0
10.0
8.4
7.0
5.9
5.0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Temperature [°C]
English
0
5
10
5.6
4.5
3.7
27.3
22.1
18.0
50
55
60
0.8
0.7
0.6
4.2
3.6
3.1
35
40
45
50 55
60
Temperature [°C]
35
40
45
50 55
60
EN-11
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