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www.dimplex.de EN-7
English
7.4
Minimum heating water flow
The minimum heating water flow 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 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.
ATTENTION!
The use of an overflow valve is only recommended for panel heating and
a maximum heating water flow of 1.3 m³/h. System faults may result if this
is not observed.
Frost protection
A method of manual drainage (see illustration) should 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 system has to be drained if the heat pump is
taken out of service or if a power failure occurs. If heat pump
systems are implemented in buildings where a power failure
cannot be detected (holiday homes etc.), the heating circuit
should be operated with suitable frost protection.
7.4 Temperature sensor
The following temperature sensors are already installed or must
be installed additionally:
External temperature sensor (R1) supplied
Return temperature sensor (R2) installed
Flow temperature sensor (R9) installed
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 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)
Fig. 7.1:Sensor characteristic curve NTC-10
Fig. 7.2:Sensor characteristic curve, standardised NTC-2 according to
DIN 44574
External temperature sensor
Temperature in °C -20 -15 -10 -5 0 5 10
Standard NTC-2 in
kΩ
14.6 11.4 8.9 7.1 5.6 4.5 3.7
NTC-10 in kΩ67.7 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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