Samsung AM072BXV Series Service Manual page 256

Piping Diagram
7-3 Functions (cont.)
7-3-2 Control (cont.)
7-3-2-5 Protective control
High Pressure Protection
▪ Purpose
Prevent abnormal high pressure to protect the system and compressors.
▪ Concept
The compressor operation frequency is lowered to decrease the high pressure.
▪ Control specifications in detail
- The compressor operation frequency is controlled according to the high pressure, as shown below.
1st step Hz hold: The current frequency is fixed. (It is possible to lower the frequency if necessary)
2nd step Hz down: The frequency is forcibly lowered by 5Hz at specified intervals.
3rd step HP down: The frequency is forcibly lowered by 1Hz every second.
4th step Comp trip: Compressors stop and an error is triggered (E407).
Cooling
Heating
& (T.HP + 1.5)
※ T.HP = Targ et Hig h Pressure
Samsung Electronics
40
38
Hz Down area
37
Hz Hold area
36
Normal op eration
※ High Pressure < 30 k gf /cm
40
32
& (T.HP + 4)
Hz Down area
30
& (T.HP + 3)
Hz Hold area
28
Normal op eration
※ High Pressure < 30 k gf /cm
Compressor T rip (E407)
HP Down area
HP Down release
2
,g : Compressor Trip release
Compressor T rip (E407)
HP Down area
HP Down release
2 ,g : Compressor Trip release
Hz D own release
Hz Hold release
Hz D own release
Hz Hold release
250