EN-8 452161.66.03 · FD 9411
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LI 11TES - LI 16TES
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
completely avoided, but in systems with flow temperatures below
60°C, the problem can be disregarded.
With medium and high-temperature heating systems, even
temperatures above 60 °C can be reached.
The following standard values should therefore be adhered to
regarding the filling and make-up water according to VDI 2035,
sheet 1:
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 pro-
cedure for setting an overflow valve is described in the chapter
"Start-up". When the minimum heating water flow rate is under-
shot, 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.
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 (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
