2. Function
2.1 Function description Optima 180
The ow diagram shows the location of the sensors, while
the control circuit board shows the relay outputs and the
other outputs for connecting fan and control panel.
Usage of hot tap water heat pump
The heat pump is only intended to produce hot tap water
for domestic use within the specied temperature limits.
The Vanvex sanitary hot water heat pump is a complete
unit with a 185/285 litre hot water tank, extraction fans,
heat pump and also equipped with a complete electrical
equipment and ve models are equipped with a heating
coil which is prepared for connection of a solar collector /
central heating.
Capacity
The Vanvex is capable of producing a hot water volume
of app. 380 Litres at 55°C. The actual volume depends on
the supplied fresh water temperature, air temperature and
the pattern of use of hot water. The additional electrical
heating element may be used to boost the capacity
whenever needed. The heat pump only uses app. 30% of
the energy compared to a conventional electric boiler.
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 sufcient amount of
hot tap water covering the needs of a common family.
Water heating:
When hot water is drawn off, the tank will be relled
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 fans run and circulate air
through the cooling surface.
Fan operation:
The fan may be set to run continuously, - even after the
compressor has stopped - by selecting level 2 or level 3.
This option may be chosen when the Vanvex 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.
Defrosting:
When the temperature difference between the
temperature upstream of the cooling surface and the
temperature of the cooling surface becomes too large
(as happens when ice is formed on the cooling surface),
the unit goes into defrost mode. The magnetic valve
MA 4 opens and the supply air fan stops until the ice
has melted and the cooling surface has reached a
temperature of app. 8°C. Then the magnetic valve closes
again and the supply air fan resumes operation.
2.2 Extra Capacity
If a situation should occur where the heat pump is not
capable of producing enough hot tap water, an extra
electrical heating element 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
heater should heat up the water. (Only use the electrical
heater when needed, as it uses more energy than the
compressor). The activation of the electrical heater is
done manually on the display.
2.3 Operating safety
High-pressure switch:
To prevent the compressor exceeding its range of
operation, there is an integral high pressure switch, which
interrupts when the pressure becomes too high. Activate
the red reset button once the cause of the error has been
identied. When the high pressure switch interrupts, the
red Genvex logo will ash until the red reset button on
the pressure switch is activated. In order to prevent a
repetition of a pressure switch error, the water may be set
2-3 °C lower.
Safety breaker for electrical heating element
If an error occurs at the heater, the safety breaker trips
and stops the heater in order to prevent the tank from
being overheated. Resetting the safety breaker may be
done by breaking the small knob in the centre.
(When working on the heat pump,
always make sure the power supply is
disconnected.
Any work on this unit may only be carried
out by trained personnel!)
2.4 Warnings
High-pressure switch:
When the pressure switch trips, the red light on the
display will light until the pressure switch is reset.
