Danfoss AK-PC 772A User Manual page 51

Capacity controller for adap-kool small co2 refrigeration system

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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.

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

AK-PC 772A

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.

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