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User Guide | Optyma™ iCO2
10 | BC408445719305en-000101
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
①
Gas cooler fan ordinary
control operation.
Hot gas bypass
solenoid valve opens.
45 sec. elapsed?
Middle pressure
receiver inlet electronic
expansion valve initial
aperture.
60 sec. elapsed?
60 sec. elapsed?
Subcool coil electronic
expansion valve initial
aperture.
Hot gas bypass
solenoid valve closes.
Compressor initial
speed operation.
60 sec. elapsed?
105 sec. elapsed?
120 sec. elapsed?
Compressor ordinary
control operation.
105 sec. elapsed?
Subcool coil electronic
expansion valve ordinary
control operation.
Middle pressure
receiver inlet electronic
expansion valve ordinary
control operation.
Compressor speed
increases.
Compressor speed drops.
Low pressure value <
Stop setting pressure?
2 min. elapsed?
・
Compressor stop
・
Subcool coil electronic expansion
valve OFF (full closure)
・
Middle pressure receiver inlet
electronic expansion valve OFF
(full open)
・
Gas cooler fan OFF after delay
3 min.
delay time elapsed?
Low
pressure value >
Pressure value equivalent to
set evaporation
temperature?
To
①
Main power source ON
Suction temperature setting
Is there error?
Operation switch ON
Low
pressure value >
Pressure value equivalent to
set evaporation
temperature?
YES
NO
NO
NO
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
Detected
Low pressure value
≦
5.8 bar for 2
seconds.
Compressor error stop
Detected
Low pressure value
≦
5.8 bar for 2
seconds.
②
YES
NO
YES
NO
To
②
Outdoor air temperature <5°C
Middle pressure value
≦
Compressor start
pressure setting
4. Flow chart of respective operations
Flow chart of operations is as shown below.