Appliance Shutdown; Defrost; Hot Gas Defrost (Only For Application 5); Start Of Defrost - Danfoss AK-CC55 User Manual

AK-CC55 Single Coil and Single Coil UI
Table 5: Appliance cleaning function
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Appliance shutdown

The function closes the AKV valve and all outputs are switched off. The cooling appliance is stopped like the "Main
switch", but this happens without an "A45 standby alarm". The function can be enabled by a switch on the DI input
or via a setting through data communication.

Defrost

Depending on the application, you may choose between the following defrost methods:
Natural: Here the fans are kept operating during the defrost
Electric: The heating element is activated
Hot gas: Here the solenoid valves are controlled so that the hot gas can flow through the evaporator.
In application modes where a compressor output is defined, a simple hot gas can be defined where the compressor
is running during defrost.

Hot gas defrost (only for application 5)

This application can be used on systems with hot gas defrost, but only in small systems, e.g. supermarkets – the
functional content has not been adapted to industrial systems with large charges.
Relay 2 is used for the suction valve
Relay 3 is used for the drain valve
Relay 4 is used for the hot gas valve
It is not possible to start a manual hot gas defrost via the display or the app.
Figure 9: Hot gas application

Start of defrost

A defrost can be started in different ways:
Interval:
Defrost is started at fixed time intervals like e.g. every eighth hour. An interval must ALWAYS be set to a "higher"
value than the period set between two defrostings when a schedule or network signal is used.
Week schedule:
Here defrost can be started at fixed times of the day and night. However, max. 6 defrosts per day.
Contact:
Defrost is started with a contact signal on a digital input.
© Danfoss | Climate Solutions | 2021.02
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Drain valve
Suction valve
Hot gas valve
BC364229688105en-000101 | 12
°C
Fan
Off
°C