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Minimum heating water flow
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 cap. 11) must be assured in
all operating states. The installed flow rate sensor 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 safe-
guard the nominal flow rate.
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
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).
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6.3 Electrical connection
A standard five-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).
The relevant components in the heat pump contain an internal
overload protection.
When connecting, ensure that the incoming supply has a clock-
wise rotating field.
Phase sequence: L1, L2, L3.
ATTENTION!
Ensure the rotary field is clockwise when connecting the mains cables (if
the rotary field is not clockwise, the heat pump will not work properly, is
very loud and may cause damage to the compressor).
The control voltage is supplied via the heat pump manager.
A 3-pole line must be laid for this in accordance with the
electrical documentation. Further information on the wiring
of the heat pump manager is available in the heat pump
manager operating instructions.
A shielded communication line (J-Y(ST)Y ..LG) (not included
in the scope of supply) connects the heat pump manager
with the WPIO controller installed in the heat pump. More
detailed instructions can be found in the heat pump manager
operating instructions and in the electrical documentation.
ATTENTION!
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 is included with the heat pump man-
ager. It must be connected (Cap. 3.2 on page VIII).
NOTE
The return sensor R2 installed in the heat pump is active when the
compressor is running and must not be disconnected.
452163.66.65 · FD 9901
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