Specifications

Control Specification SiBE04-624
78 Function and Control
3.14.5 Pressure Equalization Control
Outline The pressure difference between the condenser and evaporator works as an extra load when
restarting the compressor. To limit the load on the compressor when restarting it and
consequently limit the starting current, a pressure-equalization is performed after deactivating
the compressor. Pressure equalization is achieved by opening the expansion valve to a certain
level and then closing it again.
Detail As soon as the compressor is stopped due to an OFF command, the motorized valve is
controlled as follows.
Fig.: Pressure equalization control graph in cooling mode
OFF command by remote controller, mode change 24
Thermostat OFF 0
300 pulses
300 pulses
30 seconds 30 seconds 60 seconds
450 pulses
400 pulses
Fully closed
+ pulses
Compressor off
(R5919)