Set-up 4
0020291573_00 Heat pump control interface module Installation instructions 15
3.4 CE marking
The CE marking shows that the products comply with the
basic requirements of the applicable directives as stated on
the declaration of conformity.
The declaration of conformity can be viewed at the manufac-
turer's site.
3.5 Safety devices
3.5.1 Frost protection function
The frost protection function for the system is controlled us-
ing the product itself or using the optional system control. If
the system control fails, the product guarantees limited frost
protection for the heating circuit.
At negative outdoor temperatures, there is an increased risk
of the heating water freezing if a heat pump fault occurs, e.g.
due to a power cut or a defective compressor.
3.5.2 Low-water pressure protection
This function continuously monitors the pressure of the heat-
ing water in order to prevent a possible loss of heating wa-
ter. If the water pressure falls below the minimum pressure,
an analogue pressure sensor switches the product off and,
if available, switches other modules to standby mode. If the
water pressure reaches the operating pressure, the pressure
sensor switches the product back on.
If the heating water pressure falls below ≤ 0.1 MPa (1 bar),
a maintenance message appears below the display of the
minimum operating pressure.
– Min. heating circuit pressure: ≥ 0.05 MPa (≥ 0.50 bar)
– Min. heating circuit operating pressure: ≥ 0.07 MPa
(≥ 0.70 bar)
3.6 Energy balance control
The energy balance is the integral from the difference
between the flow temperature actual value and target value,
which is added up every minute. If the set heat deficit is
reached, the heat pump starts. If the supplied heat volume
corresponds to the heat deficit, the heat pump is switched
off.
The energy balancing is used for heating and cooling mode.
3.7 Compressor hysteresis
The heat pump is switched on and off via the compressor
hysteresis for heating mode and also for energy balancing.
When the compressor hysteresis is above the target flow
temperature, the heat pump is switched off. When the hys-
teresis is below the target flow temperature, the heat pump
starts up again.
3.8 Cooling mode
4 Set-up
4.1 Checking the scope of delivery
▶ Check that the scope of delivery is complete.
Quant-
ity
Designation
1 VWZ AI
2 VR 10 standard sensor
1 Installation accessories (screws and wall plugs)
1 Installation instructions
4.2 Selecting the installation site
▶ The installation site must be below 2000 metres above
sea level.
▶ Select a dry room that is frost-proof throughout and in
which the maximum installation height is not exceeded
and the environmental temperature is neither above nor
below the permitted range.
– Permissible environmental temperature: 7 … 25 ℃
– Permissible relative air humidity: 40 … 75 %
▶ Ensure that the required minimum clearances can be
maintained.
4.3 Opening the housing
1. Unscrew the bolt from the underside of the casing.
2. Pull the casing cover slightly forwards at the lower
edge.
3. Lift the casing cover upwards.
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