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LA 26HS
6.2 Heating System Connection
The heating system connections on the heat pump have a 1 1/4"
external thread. Route the connection hoses out of the device in
a downwards direction. Use a spanner to firmly grip the transi-
tions 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
liquifier could cause the heat pump to completely break down.
For systems in which the heating water flow can be shut off via
the radiator or thermostat valves, an overflow valve must be in-
stalled in a heating bypass behind the heat pump by the cus-
tomer. 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 heat pumps, temperatures
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):
Total alkaline earths
Total heat
in mol/m³ and/or
output in [kW]
mmol/l
≤
up to 200
≤
200 to 600
> 600
< 0.02
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 sys-
tem. This can be accomplished, for example, by installing a dual
differential pressureless manifold. When the minimum flow rate
is undershot, the plate steel exchanger in the refrigerating cycle
can freeze, which can lead to total loss of the heat pump.
NOTE
The use of an overflow valve is only recommended for panel heating and
a max. heating water flow of 1.3 m³/h. System faults may result if this is
not observed.
Antifreeze
A method of manual drainage (see illustration) should be pro-
vided for heat pumps which are exposed to frost. The antifreeze
function of the heat pump manager is active whenever the heat
pump manager and the heat circulating pump are ready for oper-
ation. 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 sys-
tems are implemented in buildings where a power failure can not
be detected (holiday home).
EN-6
All manuals and user guides at all-guides.com
Total
hardness in °dH
≤
2.0
11.2
≤
1.5
8.4
< 0.11
452158.66.10 · FD 9208
6.3 Electrical Connection
A standard four-core cable is used for connecting the heat pump
to the power supply.
The cable must be provided by the customer. The conductor
cross section is selected in accordance with the power consump-
tion of the heat pump (see Appendix Device Information) and the
applicable VDE (EN) and VNB regulations.
An all-pole disconnecting device with a contact gap of at least
3 mm (e.g. utility blocking contactor or power contactor) as well
as a 3-pole circuit breaker with common tripping for all external
conductors must be installed in the power supply (tripping current
in compliance with the Device Information).
Ensure that the incoming supply has a clockwise rotating field
when connecting multiphase devices.
Phase sequence: L1, L2, L3.
ATTENTION!
Ensure that there is a clockwise rotating field: Operating the
compressors in the wrong rotational direction could cause damage to the
compressors.
The control voltage is supplied via the heat pump manager.
The heat pump manager has a 230 V AC-50 Hz power supply.
Connect the heat pump manager in compliance with its own op-
erating instructions (16 A fuse).
ATTENTION!
The control line is essential for the operation of air-to-water heat pumps
for outdoor installation. The control line must be laid separately from the
mains cable. It is not permissible for the customer to extend the control
line.
The control line (not included in scope of supply) is connected to
the heat pump manager using the two rectangular plug connec-
tors. Use the plug connector located on the base of the heat
pump adjacent to the cable gland in the base plate. More de-
tailed information can be found in the operating instructions of
the heat pump manager.
For detailed information, see Circuit Diagrams in the Appendix.
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