Piping Diagram
Samsung Electronics
227
Electronic Expansion Valve – Main (Main EEV)
▪
Purpose
Control the EEV to adjust the refrigerant flow according to the amount of heat exchanged by the outdoor heat exchanger in heating
mode.
▪
Concept
The valve is fully opened in cooling mode.
The EEV step is regulated through PD control to enable operation according to the target SH (superheat) degree in heating mode.
▪
Control specifications in detail
In case of cooling operation, leave Main EEV fully open. In case of heating operation, control the Main EEV by assuming the outdoor unit
SH. In case that DSH is over the setting value, control it via SH control.
Make sure to perform a balanced control so that the required vapor cannot be concentrated to a certain outdoor unit considering the
evaporated pressure during outdoor period.
In case of installing a module for SH control, control SH at 5 K considering possible unbalance with the excessive state during outdoor
period and control it at 2 K in case of installing a unit.
EEV control period : every 20s
Controlled by capacity
DSH normal
Module installation
Low pressure equal
between ODUs
Target SH control
Module install : 5 K
Target SH control
Single install : 2 K
Low pressure equalization control
EEV control repeat
DSH protection control
Yes
Yes
Yes
No
No
No
7-3 Functions (cont.)
7-3-2-1 Actuator (cont.)
7-3-2 Control (cont.)
