Dimplex HPWH 300, Инструкция по установке и эксплуатации

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www.dimplex.com.au 451903.66.18 · FD 9501 EN-3
English
HPWH 300 - HPWH 300HE
2 Description
2.1 General
The domestic hot water heat pump is a ready-for-use heating de-
vice whose main components are a domestic hot water cylinder,
the components of the refrigerant, air and water circuits and the
control, regulation and monitoring devices required for automatic
operation.
The domestic hot water heat pump is supplied with electrical en-
ergy and uses the heat stored in the intake air for domestic hot
water preparation. The domestic hot water heat pump with inter-
nal heat exchanger can be connected to additional heat genera-
tors such as boilers and solar energy systems. A vertical clad-
ding tube (inner
 
12 mm) houses an external temperature
sensor. The devices are equipped as standard with an electric
heating element (1.5 kW).
The temperature of the intake air (the heat source) provides the
reference value for the energy consumption and the domestic hot
water preparation heating-up time.
Falling exhaust air temperatures reduce the heat pump output
and increase the heating-up time. In order for the heat pump to
be operated economically, the air intake temperature should not
fall below 15 °C. If the air intake temperature falls below 0 °C
±1.5, the heat pump is switched off and the domestic hot water
heating is heated by the standard heating element (1.5 kW).
The electric heating element fulfils four functions:

Supplementary heating
The heat-up time is approximately halved by switching on
the heating element (via the "Heating element" switch, see
Cap. 6.2 on pag. 6) in addition to the heat pump.

Frost protection
If the air temperature falls below 0 °C ±1.5, the electric heat-
ing element switches on automatically and (nominally) heats
the water up to the domestic hot water setpoint temperature
of 60°C.

Emergency heating
In the event of a heat pump fault, the domestic hot water
supply is maintained by the heating element.

Higher water temperature
If the required domestic hot water temperature is higher than
the temperature achievable by the heat pump (approx.
60°C), it can be raised to a max. of 85°C by means of the
heating element.
NOTE
When the domestic hot water temperature reaches 60 °C, the heat pump
switches off and the domestic hot water is heated solely by the heating
element. 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 energy source. 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 evapo-
ration pressure by a throttle mechanism (expansion valve), and
the refrigerant can again extract heat from the intake air in the
evaporator.
2.3 Safety and control devices
The domestic hot water heat pump is equipped with the following
safety devices:
High pressure switch (HP)
The high pressure switch protects the heat pump against unac-
ceptably high operating pressure in the refrigerant circuit and
switches the heat pump off in the event of a fault. The heat pump
restarts automatically as soon as the pressure in the refrigerant
circuit has dropped again.
Safety temperature limiter for heating element
(STL)
The STL protects the domestic hot water system against unac-
ceptable temperature increases.
The heating element is disconnected all-pole if the set switching
value (99 °C) is exceeded.
The heating element cannot be switched on again until the do-
mestic hot water temperature has decreased to

90°C and the
reset button (see illustration) on the STL is pressed (this must
only be done by qualified personnel).
The domestic hot water heat pump is also equipped with the fol-
lowing regulation and control devices:
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