Samsung Electronics 353
Piping Diagram
Discharge temperature protection
▪ Purpose
Prevent abnormal discharge temperature to protect the system and compressors.
▪ Concept
Two-phase refrigerant is injected into compressors to decrease the discharge temperature.
The compressor frequency is lowered to decrease the discharge temperature.
▪ Control specifications in detail
- The compressor frequency is controlled according to the discharge temp, as shown below.
1st step EVIEEV Open : EVIEEV is forcibly opened.
2nd step EVIEEV Open : The current frequency is fixed. (It is possible to lower the frequency if necessary)
3rd step Hz down : The frequency is forcibly lowered by 5Hz at specified intervals.
4th step HP down : The frequency is forcibly lowered by 1Hz every second.
5th step Comp trip : Compressors stop and an error is triggered (E416).
Compressor Trip (E416)
※ Discharge Temperature < 80℃ : Compressor Trip release
Hz Hold area
Hz Down area
HP Down area
Normal operation
Hz Hold release
Hz D own release
HP Down release
Temperature (℃)
(Discharge / Comp. Top )
EVIEEV forced co ntrol
EVIEEV control release
100 / 105
105 / 110
110 / 115
120 / 120
98 / -
93 / -
7-3 Functions (cont.)
7-3-2-5 Protective control (cont.)
7-3-2 Control (cont.)
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