User Guide | Optyma™ iCO2
12 | BC408445719305en-000101
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
(i) 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
(j) 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 at second or later 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.
