Heating System Connection; Frost Protection; Temperature Sensor - Dimplex LI 11TES Instructions D'installation Et D'utilisation

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7.3 Heating system connection

The heating system connections on the heat pump have a 1¼"
external thread. A spanner must be used to firmly grip the
transitions when connecting the heat pump.
Before connecting the heating water system to the heat pump,
the heating system must be flushed to remove any impurities,
residue from sealants, etc. Any accumulation of deposits in the
liquefier may cause the heat pump to completely break down.
For systems in which the heating water flow can be turned off
using radiator and/or thermostat valves, an overflow valve must
be installed by the customer in a heating bypass upstream from
the heating pump. This ensures a minimum heating water flow
rate through the heat pump and helps to avoid faults.
Once the heat pump has been connected to the heating
system, it must be filled, de-aerated and pressure-tested.
The following points must be observed when filling the system:
 Untreated filling water and make-up water must be of
drinking water quality
(colourless, clear, free from sediments)
Filling water and make-up water must be pre-filtered (max.

pore size 5µm).
Scale formation in domestic hot water heating systems cannot
be avoided, but in systems with flow temperatures below 60 °C,
the problem can be disregarded. With high-temperature heat
pumps and in particular with bivalent systems in the higher per-
formance range (heat pump + boiler combination), flow tem-
peratures of 60 °C and more can be achieved. The following
standard values should therefore be adhered to with regard to
the filling and make-up water according to VDI 2035, sheet 1:
The total hardness values can be found in the table.
Total alkaline earths
Total heat
in mol/m³ and/or
output in kW
mmol/l
< 50 2.0
2.0
50 - 200
1.5
200 - 600
> 600 < 0.02
1. This value lies outside the permissible value for heat exchangers in heat
pumps.
Fig. 7.1:Guideline values for filling and make-up water in accordance with
VDI 2035
For systems with an above-average specific system volume of
50 l/kW, VDI 2035 recommends using fully demineralized
water and a pH stabiliser to minimize the risk of corrosion in the
heat pump and the heating system.
ATTENTION!
With fully demineralized water, it is important to ensure that
the minimum permissible pH value of 7.5 (minimum
permissible value for copper) is complied with. Failure to
comply with this value can result in the heat pump being
destroyed.
EN-8
Specific system volume
(VDI 2035) in l/kW
20 < 50 50
< 20
Total hardness in °dH
16.8 11.2
 11.2 8.4
< 0.11
8.4
1
< 0.11
1
< 0.11
452161.66.21 · FD 9912
Minimum heating water flow
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 13.) 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 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.
1

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 sensor (R2) installed (NTC-10)

 Flow temperature sensor (R9) installed (NTC-10)
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