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LA 11MAS - LA 16MAS
6.2 Heating System Connection
The heating system connections on the heat pump have a 1" ex-
ternal thread. Route the connection hoses out of the device in a
downwards direction. Use a spanner 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
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 either a
dual manifold without differential pressure or an overflow
valve.The procedure for adjusting an overflow valve is described
in the Chapter Start-Up. When the minimum flow rate is under-
shot, 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.
EN-6
Total
hardness in °dH
2.0
11.2
1.5
8.4
< 0.11
452164.66.03 · FD 9211
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).
6.3 Electrical Connection
The power connection of the heat pump is effected via a stand-
ard 3-core cable.
The cable has to be supplied by the client and the wire cross-sec-
tion to be selected according to the power consumption of the
heat pump (see Equipment Data in the appendix) as well as the
relevant EN (VDE) and VNB regulations.
The power supply of the heat pump must be equipped with a dis-
connecting device with a contact gap of at least 3 mm (e.g. utility
service contactor, power contactor) as well as a 1-pole automatic
circuit breaker (tripping current as stated in the Equipment Data).
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 manager in compliance with its own operating in-
structions (see type plate for fuse protection).
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. The plug connector on the switch box must be used close to
the pivotal point in the heat pump. More detailed 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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