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7.2 Connection on heating side
ATTENTION!
The heating system must be flushed prior to connecting the heat pump.
Before completing the heat pump connections on the heating
water side, the heating installation must be flushed in order to re-
move any impurities that may be present, as well as residues of
sealing material, and the like. Any accumulation of deposits in
the condenser may result in a total failure of the heat pump.
Once the installation on the heating side has been completed,
the heating system must be filled, de-aerated and pressure-
tested.
Consideration must be given to the following points when filling
the system:
Untreated filling water and make-up water must be of drin-
king water quality (colourless, clear, free of 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 heat pumps, even tempera-
tures above 60°C can be reached.
The following standard values should therefore be adhered to re-
garding 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
≤
bis 200
≤
200 bis 600
> 600
< 0,02
Minimum heating water flow
The minimum heating water flow 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 manifold without
differential pressure or an overflow valve. The procedure for ad-
justing an overflow valve is described in the chapter "Start-up".
Frost protection for installations prone to frost
Provided the controller and heating circulating pumps are ready
for operation, the frost protection feature of the controller is ac-
tive. If the heat pump is taken out of service or in the event of a
power failure, the system has to be drained. In heat pump instal-
lations where a power failure cannot be readily detected (holiday
house), the heating circuit must contain a suitable antifreeze
product.
7.3 Connection on heat source
side
The following procedure must be observed when making the
connection:
Connect the well pipes to the heat pump's flow and return.
ATTENTION!
It is essential that the dirt trap included in the accessories pack is
installed in the return (inlet).
ATTENTION!
The well water must comply with the required water quality standards.
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Total
hardness in dH
≤
2,0
11,2
≤
1,5
8,4
< 0,11
The hydraulic plumbing diagram must be adhered to.
7.4 Electrical connection
The following electrical connections must be established on the
heat pump:
Control line connection in the heat pump's switch box to the
X2 terminals: L/N/PE.
Mains cable connection in the heat pump's switch box to the
X1 terminals: L1/L2/L3/PE.
Connection of the well pump mains cable on the heat
pump's control panel via terminal X1: L11/L21/L31/PE.
Connection of the well pump (to be provided by the custo-
mer) on the heat pump's control panel via terminal X1: PE
and pump contactor K5: 2/4/6.
Ensure that the supply voltage for these terminals cannot be
switched off by the tariff contactor when connecting the mains
cable for the well pump, in order to safeguard the switch-off delay
of the well pump.
All electrical components required for the operation of the heat
pump are located in the control box.
For more detailed instructions concerning the connection and
functioning of the heat pump controller (e.g. the supplied external
wall sensor) please refer to the enclosed operating manual of the
controller.
A circuit breaker with common tripping for all external conductors
must be installed in the incoming supply. All poles must be dis-
connected, and there must be a contact gap of at least 3 mm.
The same is true for any utility blocking contactors which might
be installed in addition, e.g. in the case of utility company shut-off
times. The required conductor cross-section is to be selected ac-
cording to the power consumption of the heat pump and the tech-
nical connection requirements of the respective utility company,
in addition to all applicable regulations. Details on the power con-
sumption of the heat pump are listed on both the product infor-
mation sheet and the type plate. The connection terminals are
designed for the appropriate currents.
ATTENTION!
The clockwise phase sequence must be observed when connecting the
load lines (the heat pump will deliver no output and will be very noisy
when the phase sequence is incorrect).
The power cable must be run through the guide tubes, inserted
into the side of the control box and secured by means of the
strain relief.
7.4
E-5
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