Description; General; Refrigerant Circuit (Heat Pump Operating Principle) - Dimplex DHW 300 Instructions De Montage Et D'utilisation

DHW 300 - DHW 300+
Device information. The refrigerant is CFC-free, non-ozone
depleting and non-combustible.
More information can be found in the accompanying log
book.
 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.
CAUTION!
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 domestic hot water heat pump is a ready-to-use heating
device whose main components are a domestic hot water cyl-
inder, the components of the refrigerant, air and water circuits
and the control, regulation and monitoring devices required for
automatic operation.
With the help of electrical energy, the domestic hot water heat
pump uses the heat stored in the drawn-in air for domestic hot
water preparation. The optional internal heat exchanger can be
connected to additional 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.
For this reason, an air duct system (DN 160, max. length 10 m)
can be connected to the standard spigot of the domestic hot
water heat pump for targeted waste heat recovery. For the heat
pump to be operated effectively, air short-circuits between the
drawn-in air and the blown-out air must always be avoided. This
can, for example, be achieved through the use of a bend on the
intake and outlet side.
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 for an extended period.
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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 switches on automatically and (nominally) heats
the water up to the domestic hot water set temperature.
 Emergency heating
In the event of a heat pump fault, the domestic hot water
supply is maintained by the electric heater.
 Preventative thermal disinfection
Using the operator panel keypad, domestic hot water tem-
peratures above 60 °C (up to 85 °C) can be programmed
via the "thermal disinfection" menu item.
 Reheating
Water temperatures over 60 °C are achieved with the elec-
tric heater.
NOTE
When the domestic hot water temperature reaches > 60 °C,
the heat pump switches off and the domestic hot water
preparation takes place solely by the electric heater. The
factory setting for the heating element controller is 65 °C.
2.2 Refrigerant circuit (heat pump
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.
451905.66.01a · FD 0102
operating principle)
English
EN-3