Control - Samsung AM072BXV Series Service Manual

Piping Diagram
7-3 Functions (cont.)

7-3-2 Control

7-3-2-1 Actuator
Compressor – Capacity control
▪ Purpose
Adjust the compressor operation frequency through fuzzy control. This adjusts the capacity according to load in cooling or
heating mode.
▪ Concept
The compressor frequency is adjusted through fuzzy control to enable cooling according to the target low pressure.
The compressor frequency is adjusted through fuzzy control to enable heating according to the target high pressure.
▪ Control specifications in detail
In cooling case
The capacity of a compressor is controlled by assuming the target pressure during cooling operation.
Measure pressure using the pressure sensor (low pressure sensor) installed in the outdoor unit.
In case that the measured value is lower than the target pressure, lower the operating capacity of the compressor consider-
ing that the operating capacity is higher compared to load.
In case that the measured value is higher than the target pressure, raise the operating capacity of the compressor consider-
ing that the operating capacity is lower compared to load.
▪ The target pressure value is as in the table and the initial setting value is 8.0 kgf/cm2,g. The target pressure is adjusted con-
sidering the rise and fall of the pressure in the pipe. It is calculated using evap in temperature representing the pressure of
the indoor unit. In case that rise and fall of the pressure within the pipe are big, the pressure cannot be maintained in accor-
dance with load due to high evaporated pressure of the indoor unit despite the target pressure met. The level of rise and fall
of the pressure within the pipe is recognized considering the evaporated pressure using evap in. In case the temperature
reaches the setting temperature, maintain the target pressure judging from the evaporated pressure at a certain point. In
case that the evap in temperature is higher than the setting value, lower the target pressure. Reversely, in case that the
evap in temperature is lower than the setting value, raise the target pressure. In case that the setting value of the evap in
temperature is required to be adjusted, it can be adjusted in the main PBA by referring to the installation manual.
Samsung Electronics 222