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451905.66.07 · FD 9912
EN-3
DHW 300VD+
English
Always disconnect the power supply before carrying out
any work on the domestic hot water heat pump.
When connecting the domestic hot water heat pump to
the power supply, the relevant VDE, EN and IEC standards
must be complied with. Also observe the technical connec-
tion requirements of the electrical utility companies.
This heat pump is designed for use in a domestic environ-
ment according to Article 1, Paragraph 2 k) of EU directive
2006/42/EG (machinery directive) and is thus subject to
the requirements of EU directive 2014/35/EU (low-voltage
directive). It is therefore also intended for use by non-pro-
fessionals for domestic water preparation for shops, of-
fices and other similar working environments, agricultural
establishments and hotels, guesthouses and other resi-
dential buildings.
This unit can be used by children aged 8 and over and by
persons with limited physical, sensory or mental aptitude
or lack of experience and/or knowledge, providing they are
supervised or have been instructed in the safe use of the
unit and understand the associated potential dangers.
Children must not play with the device. Cleaning and user
maintenance must not be carried out by children without
supervision.
ATTENTION!
!!
Work on the domestic hot water heat pump is to be performed
by qualified personnel only!
Observe accident prevention regulations!
2
Description
2.1 General
The ventilation unit with domestic hot water heat pump is de-
signed for controlled ventilation of frost-free residential spaces
and only uses the heat from exhaust air for the domestic hot
water preparation for heat recovery. Air ducts are used for the
air circuit.
Connecting extractor hoods to the ventilation system is not
permitted. The ventilation unit is not designed for drying struc-
tures.
Via an air duct system, used air in the rooms with the highest
levels of humidity and odours is extracted as exhaust air and
transported outside as extract air. Examples of exhaust air
rooms include bathrooms and kitchens. At the same time, fresh
outside air is brought into supply air rooms via decentral air vent
openings.
Hallways are usually overflow areas through which air flows
from supply air rooms to exhaust air rooms. An unhindered
overflow is achieved with undercut doors or overflow grilles.
The optional internal heat exchanger can be connected to addi-
tional heat generators such as boilers and solar energy systems.
The units are equipped with an electric heater (1.5 kW) as
standard.
The temperature of the drawn-in air (the heat source) serves as
the reference value for the energy consumption, the domestic
hot water preparation heat-up time and domestic hot water
temperature.
Falling outlet air temperatures reduce the heat pump's heat
output and increase the heat-up time. In order for the heat
pump to be operated economically, the air intake temperature
should not fall below 15 °C permanently.
The electric heater fulfils the following functions:
Supplementary heating
With the "Boost" key, the domestic hot water preparation
can be supported with the electric heater for an adjustable
period of time.
Operating limit
If the air intake temperature falls below -7 ±1.0 °C, the elec-
tric heater or bivalent operation switches on automatically
and heats the water up to the domestic hot water set tem-
perature.
Emergency heating
In the event of a heat pump fault, the domestic hot water
supply is maintained by the electric heater or bivalent oper-
ation.
Thermal disinfection
Using the operator panel keypad, a time program and do-
mestic hot water temperatures above 60 °C (up to 85 °C)
can be programmed via the "thermal disinfection" menu.
Reheating
Domestic hot water temperatures above 60 °C are
achieved with the electric heater or the second heat gener-
ator.
NOTE
º
When the domestic hot water temperature reaches > 60 °C,
the heat pump switches off and the domestic hot water
preparation takes place via the electric heater or the second
heat generator. The factory setting for the heating element
controller is 65 °C.
2.2 Refrigerant circuit (heat pump
operating principle)
The refrigerant circuit is a closed system in which the R134a re-
frigerant is the work material. The finned heat exchanger ex-
tracts heat from the drawn-in air at a low evaporation tempera-
ture, and transfers it to the refrigerant. The vaporous refrigerant
is taken in by a compressor, where it is compressed to a higher
pressure and temperature level before being transported to the
liquefier, where the heat absorbed in the evaporator and part of
the compressing energy is transferred to the water. Subse-
quently, the high condensation pressure is lowered to the evap-
oration pressure by a throttle mechanism (expansion valve), and
the refrigerant can again extract heat from the intake air in the
evaporator.
