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LIK 12TU
7.3 Heating System Connection
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
liquifier could cause the heat pump to completely break down.
ATTENTION!
The supplied dirt trap should be installed in the return before the heat
pump.
With the insertion piece with cap nut (also supplied), the dirt trap
can be flush-mounted directly on the heat pump return.
An overflow valve is installed in the device for systems in which
the heating water flow can be shut off via the radiator or thermo-
stat valves. This ensures a minimum heating water flow rate
through the heat pump and helps to avoid faults.
Once the heating system has been installed, it must be filled, de-
aerated and pressure-tested.
Consideration must be given to the following when filling the sys-
tem:
Untreated filling water and make-up water must be of drink-
ing water quality (colourless, clear, free from sediments)
Filling water and make-up water must be pre-filtered (pore
size max. 5 µm).
Scale formation in hot water heating systems cannot be com-
pletely avoided, but in systems with flow temperatures below
60 °C the problem can be disregarded.
With medium and high-temperature heating systems, tempera-
tures above 60 °C can be reached.
The following standard values should therefore be adhered to
concerning the filling water and make-up water (according to VDI
2035 Sheet 1):
The integrated expansion vessel has a volume of 24 litres.
The volume should be checked by the heating system engineer.
If necessary, an additional expansion vessel must be installed
(according to DIN 4751, Part 1). The tables listed in the manufac-
turers' catalogues simplify dimensioning the system on the basis
of the water content. Allow for a buffer tank volume of 55 litres
when making the calculation.
ATTENTION!
In the case of large-volume heating circuits, an additional expansion
vessel must be used to supplement the installed expansion vessel (24
litres, 1.0 bar admission pressure).
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.
When the minimum heating water flow rate is undershot, the
plate heat exchanger in the refrigeration circuit 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 ac-
count 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.
Antifreeze
Heat pump systems, which cannot be guaranteed to be frostfree,
should be equipped with a drainage option (see Fig.). The anti-
freeze function of the heat pump manager is active whenever the
heat pump manager and the heat circulating pump 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 cir-
cuit 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).
7.4 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)
Total heat
output in [kW]
Total alkaline earths
in mol/m³ and/or
mmol/l
Total
hardness in °dH
up to 200
2.0
11.2
200 to 600
1.5
8.4
> 600
< 0.02
< 0.11
