Samsung DVM Chiller Training page 12

DVM Chiller Introduction
Selectable chiller group operation control patterns
▪ Efficiency Control – Applications where the controlled area has a low load
▪
System capacity control uses an average leaving water temperature of all operating units in a module
▪
Load response time is prioritized as system capacity is increased
▪ Efficiency Control maintains compressor operating frequencies in the mid range frequencies (50 – 80Hz)
▪
Setting is enabled during commissioning
50 ~ 80Hz
When the RPM of first unit reaches
the most efficient level (60 ~ 80Hz),
It starts operating second unit.
DVM Chiller Operation Control Patterns
Starting
50 ~ 80Hz
Start operating a unit with the
highest priority.
↑
↑
Operating
↑
↑
It turns on the next unit in order of
priority as cooling load increase. The
max. rpm is still limited below
50 ~ 80Hz.
↑ ↑ ↑ ↑
↑ ↑ ↑ ↑
As the cooing load changes, the RPM
of operating units will
increase/decrease at the same time.
Close to set point
50Hz
Thermo-Off
When the RPM of operating units
are below 50Hz, it will turn off one
of the units with the lowest priority.
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