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DHW 300VD+
2.3 System plan ventilation system
The requirements on the ventilation system to be installed are
as individual as the apartments and residential buildings them-
selves.
A system design is required to select the suitable ventilation
unit and the correct settings.
A balance of air volumes must be generated that factors in both
the size and the utilisation of the individual rooms to be venti-
lated. The system design calculates the required air volume
flows, the size and number of air inlets and outlets, dimensions
the air duct system and ultimately determines the required ven-
tilation unit.
The air volume flows are selected so that the air flows from
rooms with low air contamination (supply air rooms) to rooms
with higher air contamination (exhaust air rooms).
NOTE
º
The following are required for the system design:
- Information on the building and the ventilated living space
- Ground plans with details outlining the use of space
- Sectional view with details of the room height
These planning documents are used to divide up the building
into supply air areas, exhaust air areas and air overflow areas.
Supply air rooms are all living rooms, bedrooms and recreation
rooms
Exhaust air rooms are bathrooms, toilets, kitchens, utility rooms
Overflow areas are between the supply air and exhaust air ar-
eas, e.g. hallways
NOTE
º
An incorrectly dimensioned ventilation system can lead to
defective ventilation and purging or cause loud noises and
excess energy consumption. Country-specific and regional
rules and regulations must be taken into consideration and
observed.
ATTENTION!
!!
Special requirements apply for simultaneous use of
ventilation systems and fireplaces. Country-specific and
regional rules and regulations must be observed. Early
consultation with the relevant chimney sweep is strongly
recommended!
ATTENTION!
!!
Existing fire protection regulations must be taken into
consideration and observed for the installation of ventilation
systems!
With exhaust air systems, the fresh air backflow takes place via
outside air openings installed in the supply air rooms. The posi-
tioning must be taken into account in the system plan.
2.4 Safety and control devices
The domestic hot water heat pump is equipped with the follow-
ing safety devices:
High pressure switch (HP)
The high pressure switch protects the heat pump against unac-
ceptably high operating pressure in the refrigerant circuit and
the pressure switch switches the heat pump off in the event of
a fault. The heat pump restarts with a time delay when the pres-
sure in the refrigerant circuit has dropped again.
Safety temperature limiter for electric heater (STL)
The STL prevents impermissibly high temperatures from devel-
oping in the domestic hot water cylinder.
The electric heater switches off if the set switching value
(99 °C) is exceeded.
The electric heater cannot be switched on again until the do-
mestic hot water temperature has decreased to
90 °C and the
reset button (1) on the STL (under flange cover) is pressed (this
must only be done by qualified personnel).
The thermostat with factory setting (65 °C) can be increased by
turning the adjusting screw (2) clockwise.
The domestic hot water heat pump is also equipped with the
following regulation and control devices:
Heat pump temperature controller
Temperature control in the domestic hot water cylinder and the
regulation for compressor operation is carried out by the con-
trol electronics. Electronic sensors measure the water tempera-
ture, which is regulated based on the setpoint. The desired tem-
perature level (setpoint) is set via the keypad on the control
panel.
Air intake temperature
The sensor connected to the controller measures the tempera-
ture in the domestic hot water heat pump directly in front of the
evaporator (air intake temperature). If the set switching value is
not reached (-7 ±1 °C, switch-back value 2 K,
delay 30 min), the domestic hot water preparation is switched
automatically from heat pump operation to heating element
operation.
F17
STB
(1)
85 °C
30 °C
(2)
