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Machine-specific engineering and preparation
Note
Avoid fitting the outside temperature sensor to the
casing of the outdoor unit or in the air flow from
the outdoor unit.
Mixer sensor:
If, in addition to a direct heating circuit, your system also
has a heating circuit with mixing valve, then a mixer sensor
must be installed.
The mixer sensor is not included in scope of delivery.
»
Install the mixer sensor immediately downstream of
the heating circulation pump for the heating circuit
with mixing valve, on a (metal) pipe made of a good
heat-conducting material.
8.4.10 Pumps and servomotors
Pumps (heating circulation pump, buffer charging pump)
and actuators (3-way switching module, mixing valve) are
connected to the corresponding terminals in the control
box.
Material damage
A test run of the pumps and servomotors may be
conducted only on a system that has been pre-
pared for commissioning. The hydraulics must be
fully connected.
8.4.11 PSU signal contact
Voltage present at the PSU
signal contact
230 V
0 V
Tariff switching on the heat pump system
In the case of tariff switching (with interrupted power sup-
ply), the heat pump is temporarily shut down by the power
supply utility (PSU).
Uninterrupted tariff
In the case of tariff switching with uninterrupted power
supply, the heat pump is temporarily shut down by the
power supply utility. A PSU signal contact is provided for
this purpose on the indoor unit. To activate this function, it
is necessary to remove a cable jumper in the control box
and connect the PSU signal contact cable.
Shutdown by means of a tariff contactor
In the case of shutdown by means of a tariff contactor
installed on site (sealed by the PSU), the power supply to
the heat pump compressor is disconnected. Here, it is es-
30
Status
Heat pump enabled
PSU shutdown active
sential to connect an auxiliary contact to the tariff contactor
of the PSU signal contact on the indoor unit.
Night tariff
Where tariff switching takes place within the meter (night
tariff), the PSU signal contact is not connected.
8.4.12 Smart grid
The smart grid function must be configured during com-
missioning in order for it to work. Information regarding
the settings options can be found in the operating manual.
8.4.13 High limit safety cut-out (STB-PUM-HK1)
When using surface heating systems (e.g. underfloor heat-
ing, wall heating), provide an appropriate high limit safety
cut-out. In the event of a fault, this will directly interrupt the
heating circulation pump.
»
Implement the contact as N/C contact.
»
Use a high limit safety cut-out approved for a switch-
ing load of at least 1 A (230 V).
8.4.14 Outdoor unit hardware shutdown (WQA-ERR-
SIG)
If the controller power supply fails, the outdoor unit hard-
ware must also be shut down. To ensure this, an external
power contactor must be installed.
The external power contactor should be controlled with
the WQA-ERR-SIG controller output. This contact is a
230 V AC output.
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