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REVO-E Heat pump 4 Function and functional schematics
4.4 Work modes of the REVO-E heat
pump in the Volvo 7900 Electric
There are 9 different operating modes.
The well-known 6 operating modes of the REVO-E air-
conditioning system (see WM REVO-E) are extended by
three working modes.
In the following explanations, only the new working modes
are considered.
Choosing or switching between modes occurs according
to defined criteria of the BEA body climate control system.
1. Heating/ Ventilation Mode
2. Heating/ Ventilation Mode Ready for Cooling
3. Heating/ Ventilation Mode Ready for Heat Pump *
4. Cooling Mode
5. Heat Pump Mode *
6. De-Icing Mode ** (11123865_only)
7. Reheat Mode
8. Waste Energy Mode
9. Gas Charging Mode
*) new mode for heat pump
**) in 11123865_only
This is a list of priorities in case several modes are simul-
taneously required by the BEA body system. The SC620
must employ the mode with the highest priority.
Operating mode De-Icing (in 11123865_ only)
This mode is activated by the SC620 depending on the
state of icing. The BEA body control is only informed
about the mode. In this mode, the heat pump function is
disabled.
General operating mode conditions:
- mode required by BEA body (e.g. Cooling Mode to
reduce the temperature in passenger compartment or
Heat Pump Mode to increase the temperature in
passenger compartment)
- general system conditions (e.g. external temperatures
/ status of 600V DC system)
- operating mode de-icing not activated
Depending on the mode, the SC620 or BEA body system
will control the actuators.
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