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LA 1728
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
procedure for setting an overflow valve is described in the
chapter "Start-up". When the minimum heating water flow rate
is undershot, the plate heat exchanger in the refrigeration cir-
cuit 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
account 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. When decommissioning the heat
pump, or in the event of a power failure, the system must be
drained through the indicated points (see illustration); it may be
necessary to purge the system with compressed air. The heat-
ing 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).
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6.3 Electrical connection
3 lines/cables must be routed to the heat pump in total:
A standard 5-core cable is used to connect the heat pump
to the power supply.
The cable must be provided on-site. The conductor cross
section is selected in accordance with the power con-
sumption of the heat pump (see attachment Device Infor-
mation) 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 contac-
tor) must be installed in the heat pump power supply.
A 3-pole circuit breaker with joint tripping of all outer con-
ductors (trip current in accordance with device informa-
tion) provides the short circuit protection taking into ac-
count the layout of the internal wiring.
The relevant components in the heat pump contain an in-
ternal overload protection.
When connecting, ensure that the incoming supply has a
clockwise rotating field.
Phase sequence: L1, L2, L3.
CAUTION!
Ensure that there is a clockwise rotating field: With incorrect
wiring the starting of the heat pump is prevented.
corresponding warning is indicated on the display of the heat
pump manager (adjust wiring).
The control voltage is supplied via the heat pump man-
ager.
A 3-pole line must be laid for this in accordance with the
electrical documentation. Further information on the wir-
ing of the heat pump manager is available in the heat pump
manager operating instructions.
A shielded communication line (not included in the scope
of supply) connects the heat pump manager with the heat
pump. More detailed instructions can be found in the heat
pump manager operating instructions and in the electrical
documentation.
NOTE
The communication cable is necessary for the function of air-
to-water heat pumps in outdoor installation. It must be
shielded and laid separately from the mains cable.
6.3.1 Demand sensor connection
The demand sensor R2.2 (NTC 10) is included with the heat
pump manager. It must be installed depending on the hydrau-
lics used (see attachment chapter 3 on page V).
If no request sensor is connected, regulation of the 2nd heat
generator will not be possible in the event that communication
with the heat pump manager is disrupted.
NOTE
The return sensor R2 installed in the heat pump is active when
the compressor is running and must not be disconnected.
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