Samsung AM200FXWANR - Page 232

Piping Diagram
Samsung Electronics 231
Discharge temperature protection
ƒ Purpose
Prevent abnormal discharge temperature to protect the system and compressors.
ƒ Concept
Two-phase refrigerant is injected into compressors to decrease the discharge temperature.
The compressor frequency is lowered to decrease
the discharge temperature.
ƒ Control specifications in detail
- The compressor frequency is controlled according to the discharge temp, as shown below.
1st step EVIEEV Open : E
VIEEV is forcibly opened.
2nd step EVIEEV Open : The current frequency is fixed. (It is possible to lower the frequency if necessary)
3rd step Hz d
own : 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).
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7-3 Functions (cont.)
7-3-2-5 Protective control (cont.)
7-3-2 Control (cont.)