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4. Full adaptive:

Full Adaptive mode is ideal for applications where defrost is not requested to be performed at a certain time, but

can be performed whenever ice is starting to interrupt the airow. It makes sense to combine this mode with the

defrost interval timer as a safety timer.

Adaptive defrosting requires the following connections:

• Expansion valve type AKV

• Pe evaporator pressure and S2 gas out temperature

• Temperature signal from both S3 and S4. Sensors must be placed in the airow/channel immediately before / after

the evaporator.

• Condensing temperature Tc is distributed via the network from the system manager. If Tc is not received by the

case controller, the adaptive defrost function is using default back-up values.



NOTE:

Adaptive parameters will be reset after a defrost has been initiated or at main switch in stopped or service mode. At

start up with a warm evaporator (measured with S2 sensor), the evaporator is presumed clean. If the evaporator

temperature is measured below 0.1 °C, adaptive defrost will request a defrost start to secure a clean evaporator.

Min. time between defrosts

There is a preset 2 hours minimum time between defrosts. This avoids that planned defrosts in accordance with the

weekly schedule are carried out immediately after an adaptive defrost has been carried out. The time applies from

when an adaptive defrost has been completed to when a planned defrost is again permitted. The adaptive defrost

will not start defrosting with a shorter interval than the 2 hours either.

Melt function

This function will prevent the air ow in the evaporator from being reduced by frost created by uninterrupted

operation for a long time.

The function is activated if the thermostat temperature has remained in the range between -5 °C and +10 °C for a

longer period than the set melting interval. The refrigeration will then be stopped during the set melting period.

The frost will be melted so that the air ow and hence the evaporator’s capacity will be greatly improved.

Control of two compressors (only with custom set-up)

Two compressor steps can be controlled cyclic or sequentially. At cyclic control, two compressors must be of the

same size, while in sequential control compressor step 1 can be larger than step 2.

Figure 12: Control of two compressors

Cyclic control

When the controller demands refrigeration, it will rst cut in the compressor with the shortest operating time. After

the time delay, the second compressor will be cut in.

AK-CC55 Single Coil and Single Coil UI

Danfoss AK-CC55 User Manual

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