Description; General Information; Refrigerant Circuit (Heat Pump Operating Principle; Water Circuit - Dimplex LBW 300 Installation And Operating Instructions Manual

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Description

2.1 General Information

The HW HP is a ready-to-use heating device and consists mainly
of the domestic water cylinder, the components for the refriger-
ant, air and water circuits, as well as all control, regulation and
monitoring devices required for automatic operation. The desired
fan level (3 levels) can be selected using a wired remote control.
The device version with interior heat pipe heat exchanger is suit-
able for connection to an additional heat generator such as a
boiler or solar installation. This version's cylinder has a vertical
cladding tube (inner∅ = 12 mm) for housing an external temper-
ature sensor (cylinder temperature) to control/regulate the sec-
ond heat generator.
With the help of electrical energy, the HW HP uses the heat
stored in the drawn-in air for domestic hot water preparation.
The air intake stub of the device can be connected to a central
exhaust 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 (must be) fed into the building via the decentralized outside
air valves. Air distribution systems (central exhaust air and de-
centralized outside air) are offered as accessories.
The devices are still equipped with an electric heating element
(1.5 kW) as standard.
The electric heating element fulfils three functions:
Supplementary electric heating system
The heating-up period is approx. halved by switching on the
heating element (using the "heating element" switch, see the
chapter "HW HP Operation") in addition to the heat pump.
Higher water temperature
If the required hot water temperature is higher than the tem-
perature achievable by the heat pump (approx. 58 °C), it can
be raised to a max. of 85 °C by means of the heating ele-
ment (factory setting: 65 65 °C).
Note: When the hot water temperature reaches > 58 °C, the
heat pump switches off and the domestic hot water is heated
solely by the heating element.
Emergency heating
The domestic hot water supply is maintained by the heating
element when the heat pump is out of order.
Operating limit
Whenever the temperature of the drawn-in air sinks below 14 °C,
the electric heating element switches on automatically and heats
the water up to the factory default maximum heat pump temper-
ature of approximately 58 °C.
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2.2 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 ex-
changer extracts heat from the drawn-in air at a low evaporation
temperature, and transfers it to the refrigerant. The vaporous re-
frigerant is sucked in by a compressor where it is compressed to
a higher pressure and temperature level before being trans-
ported 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 condensation pressure is lowered to the
evaporation pressure via a throttle mechanism (expansion
valve). In the evaporator, the refrigerant can once again extract
heat from the drawn-in air.

2.3 Water Circuit

The HW HP water circuits depend on the pump type (with or with-
out internal heat exchanger). They must be installed by the cus-
tomer. The water connections (illustration) are at the rear of the
unit.
* Only for HW HP with internal tube heat exchanger
Air duct connection DN 160 ⇒ external diameter 160
Important information:
Circulation pipe
For energy efficiency reasons, a circulation pipe should not
be used. If a circulation pipe is installed in the domestic hot
water distribution system, a valve or a similar device must be
provided as shut-off facility to avoid unnecessary energy
losses. Circulation is enabled according to use (time or re-
quirement control).
Condensate outflow:
Please refer to the chapter "Connecting the Condensed
Water Pipe".
2.3
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