Connection On Heat Source Side; Temperature Sensor; Mounting The External Temperature Sensor - Dimplex Si 24Te Montage- Und Gebrauchsanweisung

7.3
Frost protection for installations prone to frost
Provided the heat pump manager and heating circulating pumps
are ready for operation, the frost protection feature of the heat
pump manager is active. If the heat pump is taken out of service
or in the event of a power failure, the system has to be drained.
In heat pump installations where a power failure cannot be read-
ily detected (holiday house), the heating circuit must contain a
suitable antifreeze product.
7.3 Connection on Heat Source
Side
The following procedure must be observed when making the
connection:
Connect the brine line to the flow and return pipe of the heat
pump.
The hydraulic plumbing diagram must be observed here.
ATTENTION!
The supplied strainer must be fitted in the heat source inlet of the heat
pump in order to protect the evaporator against the ingress of impurities.
In addition, a microbubble deaerator must be installed in the heat
source system.
The brine liquid must be produced prior to charging the system.
The brine concentration must be at least 25 %. Freeze protection
down to -14 °C can thus be ensured.
Only antifreeze products on the basis of mono-ethylene glycol or
propylene glycol may be used.
The heat source system must be vented (de-aerated) and
checked for leaks.
ATTENTION!
The brine solution must contain at least 25 % of an antifreeze agent on a
mono-ethylene glycol or propylene glycol basis and must be mixed prior
to filling.

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. The only exception is the external
temperature sensor included in the scope of supply of the heat
pump (see Fig.7.2)
EN-6
-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 ac-
cording 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.