Description; General; Refrigerant Circuit (Heat Pump Operating Principle) - Dimplex Dhw 300Vd+ Montage- Und Gebrauchsanweisung

DHW 300VD+
 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 direc-
tive). It is therefore also intended for use by non-profession-
als for domestic water preparation for shops, offices and
other similar working environments, agricultural establish-
ments and hotels, guesthouses and other residential build-
ings.
 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 su-
pervised 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 su-
pervision.
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 per-
mitted. The ventilation unit is not designed for drying structures.
Via an air duct system, used air in the rooms with the highest lev-
els of humidity and odours is extracted as exhaust air and trans-
ported outside as extract air. Examples of exhaust air rooms in-
clude bathrooms and kitchens. At the same time, fresh outside
air is brought into supply air rooms via decentral air vent open-
ings.
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 stand-
ard.
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 tempera-
ture.
Falling outlet air temperatures reduce the heat pump's heat out-
put 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.
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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 temper-
ature.
 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 generator.
NOTE
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 extracts
heat from the drawn-in air at a low evaporation temperature, 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 com-
pressing energy is transferred to the water. Subsequently, the
high condensation pressure is lowered to the evaporation pres-
sure by a throttle mechanism (expansion valve), and the refriger-
ant can again extract heat from the intake air in the evaporator.
451905.66.07 · FD 9908
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