Samsung Electronics 206
Piping Diagram
Electronic Expansion Valve – Main (Main EEV)
ƒ Purpose
Control the EEV to adjust the refrigerant flow according to the amount of heat exchanged by the outdoor heat exchanger in heating
mode.
ƒ Concept
Th
e 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.
ƒ 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
u
nit 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.
EEV contr ol period : every 20s
Controlled by capacity
DSH normal
Heat recovery operation?
Target SH Control
Target SH = Water temperatrue - 3ఁ
Target SH control
Target SH = (Low pressure-10)*7+5
EEV contr ol repeat
DSH prot ection control
Yes
Yes
No
No
No
7-3 Functions (cont.)
7-3-2-1 Actuator (cont.)
7-3-2 Control (cont.)
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