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A.O. Smith AH 290 Manual

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2.1 Description
The ow diagram shows the location of the sensors, while the circuit board
shows the relay outputs and the other outputs for connecting fan and
control panel.
Use of hot tap water heat pump:
The AH 290 is an independent sanitary hot water heat pump to be installed
in rooms that are not part of the living space, e.g. basement rooms. The
only requirement to the room is that the air temperature stays between 8°C
and 35°C.
We recommend basement rooms because even during the winter heat is
supplied from the surrounding soil layer.
Heat pump operation:
The control starts the compressor shortly after hot water has been tapped.
The compressor will run until the entire tank has been heated to the set
temperature again. Usually the heat pump can produce a sufcient amount
of hot tap water covering the needs of a common family.
Water heating:
When hot water is drawn off, the tank will be relled with cold water at the
bottom. A sensor measures the temperature at the bottom of the tank and
starts the compressor if the temperature has fallen 5°C below the set
temperature. The compressor stops, when the water has been heated to
the set temperature. While the compressor operates, the fan runs and
circulates air through the cooling coil.
Fan operation:
The fan may be set to run continuously, when the compressor has stopped
- by selecting level 2 or level 3. This option may be chosen when the heat
pump is used as an extraction system in the residential wet rooms. If the
input to T4 short circuits, the control is forced to run at 3rd speed. This may
be used in order to achieve more extract in e.g. bathroom, while taking a
shower. When breaking the short circuit on the input pins to T4, the control
will return to its previous step.
2.2 Extra capacity
If a situation should occur where the heat pump is not capable of producing
enough hot tap water (more people in the house), an extra electrical
cartridge in the container can be switched on. Doing so, it is possible to heat
up more water. It is possible to set the desired temperature to which the
electrical cartridge should heat up the water. (Only use the electrical
cartridge when needed, as it uses more energy than the compressor). The
electrical cartridge can be activated manually on the display.
2. Function
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