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LA 22TBS - LA 28TBS
6 Assembly
6.1 General
The following connections need to be established on the heat
pump:
Heating system flows and returns
Condensate drain
Communication line
Control voltage line
Supply voltage line
6.2 Connection on the heating side
The heating system connections on the heat pump are to be
made inside the device. Refer to the device information for the
connection sizes. The connection hoses are routed out of the de-
vice in a downwards direction. 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, purged and pressure-tested. The installed dirt
trap must be checked for soiling at regular intervals (approx.
every 6 months) and cleaned if necessary.
The following points must be observed when filling the system:
Untreated filling water and make-up water must be of drink-
ing water quality
(colourless, clear, free of sediments)
Filling water and make-up water must be pre-filtered (max.
pore size 5 µm).
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, tempera-
tures above 60 °C can be reached.
The following standard values should therefore be adhered to re-
garding the filling and make-up water according to VDI 2035,
sheet 1:
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.
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 10.) must be assured in all operating states. An installed
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.
Frost protection
Heat pump systems, which cannot be guaranteed to be frost-
free, should be equipped with a drainage option (see Fig.). 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. If the heat pump is taken out of service
or in the event of a power failure, the system has to be drained,
and if required, blown out, at three locations (see illustration).
The heating circuit 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).
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
