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REVO-E Heat pump 4 Function and functional schematics
Task of the SC620:
– Control the speed of the double radial blowers / axial
fans
– Activation and speed setting of the compressor (via
frequency converter)
In Cooling mode Mode, the BEA body is not able to influ-
ence the speed of the double radial blowers.
The value of the interior temperature to be reached is
given by the difference of the external temperature and
the ∆T required by the BEA body.
Example of ∆T – 7 Kelvin
T
passenger cabin
= [T
external
(35°C) + ∆T (7K)]
T
passenger cabin
= 28°C
This value is sent via CAN by the BEA body and is used
as an internal control signal.
The "D_ElAcMaxPowerAllowed" CAN signal (from the
vehicle's power system) specifies the maximum power
consumption of the compressor.
If the cooling requested cannot be implemented (e.g.
malfunction), the system automatically switches to
Heating/ Ventilation Mode.
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