Application; Description; Refrigerant Circuit (Heat Pump Operating Principle); Water Circuit - Dimplex LWP 300W Instructions D'installation Et D'utilisation

ATTENTION!
Work on the compact domestic ventilation unit (exhaust air) may only be
performed by qualified personnel. Observe accident prevention
regulations!
2

Application

The compact domestic ventilation unit (exhaust air) is designed
for connection to a central exhaust air duct system in residential
buildings or buildings with similar use.
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Description

The compact domestic ventilation unit (exhaust air) is a ready-to-
use compact unit for supplying hot water at multiple extraction
points. With the help of electrical energy, the device uses the
heat of the exhaust air through active heat recovery.
The air intake stub of the device is connected to a central ex-
haust air duct system (2 stubs DN160 with lip seal). Using ex-
haust air valves connected on site, the exhaust air is expelled
from damp, odour-contaminated exhaust air rooms in the build-
ing in a controlled manner via the exhaust air duct system, and is
conveyed outdoors via the outgoing air stubs. The required fresh
air is fed into the building via decentralized outside air valves.
Air distribution systems (central exhaust air and decentralized
outside air) are offered as accessories.
The air volume flow (three levels) can be selected via a wall-
mounted remote control (120, 185, 230 m³/h). An EC ventilator
(electronically commutated direct current) with a constant-vol-
ume-flow regulated characteristic curve is used in the device.
Domestic hot water preparation via the heat pump is possible at
every fan level.
Note:
The heat pump module reaches its highest output for domestic
hot water preparation at the highest fan level.
The energy consumption and DHW preparation heat-up time are
directly influenced by the temperature of the drawn-in air (the
heat source). Sinking exhaust air temperatures lead to a reduc-
tion in the heat pump output.
The device is equipped as standard with an interior heat pipe
heat exchanger for connecting an additional heat generator such
as a boiler, solar installation, etc.
A vertical cladding tube (inner∅ = 12 mm) in the cylinder houses
an external temperature sensor (cylinder temperature) for the
control/regulation of a second heat generator.
The device is equipped with an electric heating element (1.5 kW)
as standard.
This electric heating element supports the
following functions:
Supplementary electric heating system
The heating-up period is approx. halved by switching on the
heating element in addition to the heat pump.
Emergency heating
The domestic hot water supply is maintained by the heating
element when the heat pump is out of order.
Higher water temperature
If the required hot water temperature is higher than the tem-
perature achievable by the heat pump (approx. 60 °C), it can
be raised to a max. of 85 °C by using the heating element.
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Note:
When the hot water temperature reaches > 60 °C, the heat pump
switches off and the hot water is heated solely by the heating el-
ement.
Defrosting:
The device has an automatic defrosting function which prevents
the evaporator from being covered with frost. This function is ac-
tivated when, for example, the lower operating limit of the ex-
haust air temperature (15 °C) is undershot or a low exhaust air
volume flow has been set and the integrated frost protection ther-
mostat reacts. Compressor operation is interrupted for defrost-
ing. The defrosting operation ends automatically.
3.1 Refrigerant Circuit (Heat Pump
Operating Principle)
The refrigerant circuit is a closed-loop system in which the refrig-
erant R134a is the circulating energy carrier.
The finned heat exchanger (evaporator) extracts heat from the
room exhaust air at a low evaporation temperature, and transfers
it to the refrigerant. The vaporous refrigerant is sucked in by a
compressor where it is compressed to a higher pressure and
temperature level before being transported to the liquifier, where
the heat taken up in the evaporator and part of the compressing
energy is transferred to the water. Subsequently, the high con-
densation pressure is lowered to the evaporation pressure via a
throttle mechanism (expansion valve). In the evaporator, the re-
frigerant can again take up heat from the surrounding air.

3.2 Water Circuit

Compact domestic ventilation unit (exhaust air) water circuits are
to be installed on site by the customer.
The following connections (illustration) are provided at the back
of the device:
3.2
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