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2. Description
The HPWH is a heating appliance ready for connection and essentially consists of a domestic water tank, the
components of the refrigeration, air and water circuits as well as all control, regulating and monitoring devices
required for automatic operation. The desired fan speed (3 settings) can be selected via a wire-bound remote
control.
The version with internal tubular heat exchanger is suited for connection to a supplementary heat source such as
a boiler or solar system. The storage tank of this type is provided with a vertical sleeve (inside
∅
= 12 mm)
designed to accommodate an external temperature sensor (tank temperature) for the control/regulation of the
supplementary heat source.
The HPWH uses electricity to extract the heat from the drawn-in air for the generation of hot water.
The air intake pipe of the unit can be connected to a central exhaust duct system (pipe socket 2x DN160 with lip
seal). Via field-installed exhaust valves and the exhaust air duct system, stale air is removed, in a controlled
manner, from high-moisture and –odour areas in the building and is then discharged to the outside via the outlet
duct. The required fresh air (supply air) is (must be) supplied to the building via decentralised outside air valves.
Air distribution systems (central exhaust air and decentralised outside air ducts) are offered as accessories.
In addition, the units are equipped with an electric immersion heater (1.5 kW) as standard.
The electric immersion heater fulfils three functions:
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Supplemental heat
Activating the immersion heater (via "Immersion heater" switch, see section Operating Panel), in addition to
the heat pump, approximately halves the heat-up time.
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Higher water temperature
If the required hot water temperature is higher than the temperature that can be reached by the heat pump
(approx. 58 °C), the temperature can be increased to max. 85 °C by the immersion heater (factory setting:
65°C).
Note:
With hot water temperatures
>>>>
58 °C the heat pump is shut off, and water heating
is accomplished by the immersion heater only.
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Emergency heat
The electric heating element (immersion heater) will maintain the hot water supply when the heat pump
requires servicing.
Operating limit
Any time the temperature of the drawn-in air drops below 14°C, the electric heating element switches on
automatically and heats the water until the factory-set maximum temperature of the heat pump of approx. 58°C is
reached .
2.1 Refrigeration
Cycle
(Heat Pump Principle of Function)
The refrigeration cycle is a closed system in which the refrigerant R134a circulates as an energy carrier. In a
finned heat exchanger, heat is extracted from the drawn in air at a low evaporation temperature and transferred to
the refrigerant. The vaporous refrigerant is drawn in by a compressor and then compressed to a higher
pressure/temperature level; it is passed to the condenser where the heat absorbed in the evaporator and part of
the heat of the compressor motor is transferred to the water. Subsequently, the high condensing pressure is
reduced by means of a throttling device (expansion valve) to the level of the evaporating pressure, and in the
evaporator the refrigerant can again absorb heat from the drawn-in air.
