Danfoss Optyma iCO2 Instructions Manual page 31

Instructions
• Flow chart of respective operations
Flow chart of operations is as shown below.
Hot gas bypass
solenoid valve opens.
60 sec. elapsed?
YES
Hot gas bypass
solenoid valve closes.
Fig. 27
© Danfoss | Climate Solutions | 2023.02 | LCA012A024
Gas cooler fan ordinary
60 sec. elapsed?
control operation.
Compressor initial
NO
speed operation.
105 sec. elapsed?
Detected
Low pressure valve
≤ 5.8 bar for 2
NO
seconds.
Compressor ordinary
control operation.
YES
To
Low
pressure value >
pressure value equivalent to
set evaporation
temperature?
Compressor speed
increases.
Main power supply ON
Suction temperature setting
Operation switch ON
Low
NO
pressure value >
pressure value equivalent to
set evaporation
temperature?
YES
NO
Is there error?
YES
NO
60 sec. elapsed?
YES
YES
Subcool coil electronic
expansion valve initial
aperture.
NO
105 sec. elapsed?
YES
YES
Subcool coil electronic
expansion valve ordinary
control operation.
NO
YES
Compressor speed drops.
Low pressure value<
stop setting pressure?
YES
2 min. elapsed?
YES
• Compressor stops
• Subcool coil electronic
expansion valve OFF (full closure)
• Medium pressure receiver inlet
electronic expansion valve OFF
(full open)
• Gas cooler fan OFF after delay
3 min.
delay time elapsed?
YES
To
Outdoor temperature <5 °C
YES
Medium pressure value
≤ compressor start
pressure setting
YES
NO
45 sec. elapsed?
YES
Medium pressure
receiver inlet electronic
expansion valve initial
aperture.
NO
120 sec. elapsed?
YES
Medium pressure
receiver inlet electronic
expansion valve ordinary
control operation.
NO
NO
Detected
Low pressure valve
≤ 5.8 bar for 2
seconds.
YES
Compressor error stop
NO
118A5495A - AN405821998738en-000102 | 31
NO
NO
NO
NO
NO