Danfoss Optyma iCO2, Instructions Manual, Page: 33 / 68

Instructions
118A5495A - AN405821998738en-000102 | 33 © Danfoss | Climate Solutions | 2023.02 | LCA012A024
9. Middle pressure overshoot prevention
1. Compressor
This control suppresses the middle pressure (MP) from rising excessively during compressor running.
If the detected middle pressure (MP) exceeds 80bar, stop the compressor. Control is end when 180 seconds pass after compressor stop
and middle pressure (MP) below 65bar.
Compressor
65 bar
OFF
ON
80 bar
2. Standstill
This control suppresses the middle pressure (MP) from rising excessively at standstill.
If the detected middle pressure (MP) exceeds 70bar, EEVSC is opened and EEVG is closed. Control is end when middle pressure (MP) below
65bar or 180 seconds pass after control start.
EEVSC EEVG
65 bar
Close
Open
70 bar 65 bar
Close
Open
70 bar
10. Oil return operation control
In the event that total operation time at lower than the frequency in the following table (excluding the stop time) exceeds 2 hours at first power on or 3
hours from second or more times of oil return and total oil loss exceeds the specified value the following control is performed.
It operates with the compressor frequency fixed at the frequency as shown in the table above.
11. Oil level error
This control outputs information about insufficient amount of oil in the compressor of condensing unit.
Set this control with SW6 -7.
• When SW6 -7 is OFF, oil level error [Enabled] * Factory setting
• When SW6 -7 is ON, oil level error [invalid].
Set output method with SW6 -5.
• When SW6 -5 is OFF, the opcode [oPE 88] is displayed on the 7 segments. * Factory setting
• When SW6 -5 is ON, all compressors are abnormally stopped. (Error Code: [E 88])
When SW6 -7 is OFF, the following control is performed.
• When the compressor is running and the oil level switch (OLS 1-2) detects "no oil" for 30 seconds continuously, stop the unit.
• After restart, if the compressor is running and the oil level switch (OLS 1-2) detects "no oil" for 30 seconds in a row, an insufficient amount of oil is output.
After restart, if the compressor is running and the oil level switch (OLS 1-2) detects "oil present" for 30 seconds continuously, reset it.
Fig. 30
Fig. 31 Fig. 32