AK-PC 772A Capacity controller RS8HF102 © Danfoss 2017-07 51
Refrigerating plant example
We have decided to describe the setup by means of an example
comprising a MT & LT compressor group and a high pressure
control.
The example is the same as the one given in the "Design" section,
i.e. the controller is an AK-PC 772A + extension modules.
Warning
Here, only the internal main switch is used to initiate regulation.
If disconnected during operation, it will stop all regulation, including
high pressure regulation.
Example
Compressor Group
MT circuit
• 3 x compressors with “Cyclical”. One speed-controlled
• Safety monitoring of each compressor
• Common high pressure monitoring
• P0 setting –10°C, P0 optimisation
LT circuit
• 2 x compressors with “Cyclical”. One speed-controlled
• Safety monitoring of each compressor
• Common high pressure monitoring
• P0 setting –30°C, P0 optimisation
Gas cooling control:
• Fans, speed-controlled
• Pressure regulation Pgc with reference from Sc3 and Sgc
• Pressure increase for heat recovery
Containers:
• Control of pressure in CO2 receiver
• Controlling the tank temperature for domestic water, 55°C
Safety functions:
• Monitoring of Po, Pc, Sd and superheat in suction line
• MT-Po max = -5°C, Po min = -35°C
• MT-Pc max = 110 bar
• MT-Sd max = 120°C
• LT-Po max = -5°C, Po min = -45°C
• LT-Pc max = 40 bar
• LT-Sd max = 120°C
• SH min = 5 °C, SH max = 35 °C
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