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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 adjusting an overflow valve is described in the
Chapter Start-Up.
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.
The antifreeze function of the heat pump manager is active
whenever the heat pump manager and the heat circulating
pumps are ready for operation. 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 systems are implemented in buildings
where a power failure can not be detected (holiday home).
7.3 Heat Source Connection
The following procedure must be observed when connecting
the heat source:
Connect the brine pipe to the heat pump flow and return. The
hydraulic integration diagram must be adhered to.
ATTENTION!
The supplied dirt trap must be inserted in the heat source inlet
of the heat pump to protect the evaporator against the ingress
of impurities.
The brine liquid must be produced prior to charging the system.
The liquid must have an antifreeze concentration of at least
25 % to ensure frost protection down to -14 °C.
Only monoethylene glycol or propylene glycol-based antifreeze
may be used.
The heat source system must be de-aerated and checked for
leaks.
ATTENTION!
The brine solution must contain at least a 25 % concentration
of a monoethylene glycol or propylene glycol-based
antifreeze, which must be mixed before filling.
NOTE
If necessary, the operating range can be extended to a brine
inlet temperature of -10 °C. In this case, the minimum brine
concentration
must
be
temperature -17 °C)
ATTENTION!
The maximum test pressure in the heating circuit and the
brine circuit is 6.0 bar (ü). This value must not be exceeded.
NOTE
A suitable de-aerator (micro bubble air separator) must be
installed in the heat source circuit by the customer.
EN-6
adjusted
to
30 %.
(Freezing
452235.66.22 · FD 9912
7.4 Temperature sensor
The following temperature sensors are already installed or must
be installed additionally:
External temperature sensor (R1) supplied (NTC-2)
Return temperature heating circuit (R2) installed (NTC-10)
Return temperature primary circuit (R24) installed (NTC-
10)
Flow temperature heating circuit (R9) installed (NTC-10)
Flow temperature primary circuit (R6) installed) (NTC-10)
7.4.1 Sensor characteristic curves
Temperature in °C
-20
-15
NTC-2 in k
14.6
11.4
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 il-
lustrated in Fig.7.2 on pag. 6. The only exception is the external
temperature sensor included in the scope of supply of the heat
pump (see Fig.7.3 on pag. 6)
60
50
40
30
20
10
0
-20
-15
-10
-5
0
5
10
External temperature in [°C]
Fig. 7.2:Sensor characteristic curve NTC 10
20
18
16
14
12
10
8
6
4
2
0
-20
-15
-10
-5
0
5
10
External temperature in [°C]
Fig. 7.3:Sensor characteristic curve, standardised NTC-2 according to
DIN 44574 External temperature sensor
SI 6TU - SI 18TU
-10
-5
0
5
8.9
7.1
5.6
4.5
42.3
33.9
27.3
22.1
40
45
50
55
1.1
1.0
0.8
0.7
5.9
5.0
4.2
3.6
15
20
25
30
35
40
45
50
55
15
20
25
30
35
40
45
50
55
www.gdts.one
10
3.7
18.0
60
0.6
3.1
60
60
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