Dimplex DHW 300VD+ Montage- Und Gebrauchsanweisung Seite 41

DHW 300VD+
7.3.4 Solar thermal function
As an alternative to using a 2nd heat generator, the domestic hot
water heat pump can be operated in combination with a thermal
solar installation. As soon as a sufficient solar yield is detected, it
is used for domestic hot water preparation and the heat pump is
blocked. The hystereses can be set in the menu. The circulating
pump is switched off again when a solar gain is no longer availa-
ble or when a temperature limit value is exceeded, either on the
collector or in the cylinder. The solar thermal function has priority
over heat pump operation and the electric heater.
ATTENTION!
The collector sensor must be a temperature sensor with the resistance
characteristic curve of a PT1000 (siehe Kap. 2.5.2 auf S. 5).
7.3.5 Photovoltaic function "SG ready"
For the photovoltaic function, the terminal X8 must be fed with
230 V 50 Hz. The evaluation unit (e.g. inverter checker) meas-
ures the output that is currently available. If the photovoltaic input
is active, the heat pump controls to the setpoint for the PV mode.
1 kW can be used as a setting reference point for the power
threshold in the inverter checker of the photovoltaic plants during
PV operation without electric heater (700 W power consumption
heat pump plus base load of the household). If the device is to
work permanently with the electric heater in PV operation, a set-
ting reference point of 2.5 kW is advisable (2200 W power con-
sumption heat pump incl. electric heater, plus base load of the
building). The solar thermal function has priority over the photo-
voltaic function. The display shows that the heat pump is being
operated using electricity from the PV-system.
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7.3.8 External block
The digital input terminal X7 is equipped with the link cable A2 as
factory default. Operation of the domestic hot water heat pump is
blocked by opening the link cable. The frost protection function
remains active.
www.gdts.one
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NOTE
The domestic hot water set temperature in photovoltaic mode should be
set to max. 55 °C to guarantee efficient operation of the heat pump. With
a domestic hot water set temperature from 60 °C, operation takes place
exclusively via the electric heater.
7.3.6 Operation with PV optimizer /
building management system
The device is equipped with a RS485 interface (X20, RJ12, 6-
pin).
The interface is described at www.dimplex.de/wiki.
The PV optimiser can be connected for increased intrinsic con-
sumption of self-produced PV electricity. For details on installa-
tion and setting, see the PV optimiser manual.
Alternatively, the building management system (BMS) can be
connected and access the device data via Modbus RTU.
7.3.7 Ventilation
The volume flows for the individual fan settings are defined dur-
ing the calibration based on the ventilation planning.
If the fan output has to be adapted to the actual measured air vol-
ume flows for the settings, i.e. to the system curve on site, the
Scale factor is used.
This influences the fan characteristic curve depending on the
pressure drops in the distribution system.
The higher the pressure drops in the system, the more fan output
is required and the smaller the required Scale factor.
Example:
 Scale factor 30 means maximum fan output at 300 m3/h tar-
get volume flow
 Scale factor 20 means maximum fan output at just
200 m3/h target volume flow
140 160 180 200 220 240 260
V [m³/h] freiblasend
p
ext, min
280 300 320 340 360 380 400
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