Figure 14: Rail heat control, dew point
During defrosting
During defrosting rail heat will be active, as selected in setting d27.
Fan
Pulse control
To obtain energy savings, it is possible to pulse control the power supply to the evaporator fans.
Pulse control can be accomplished in one of the following ways:
• during the thermostat’s cut-out period (cold room)
• during night operation and during the thermostat’s cut-out period (appliance with night blinds)
(The function is not actual when r14=2, i.e. modulating regulation).
A period of time is set as well as the percentage of this period of time where the fans have to be operating.
Figure 15: Fan cycle time
Cut-out of fans during plant breakdowns
If the refrigeration in a breakdown situation stops, the temperature in the cold room may rise quickly as a result of
the emission of heat from large fans. In order to prevent this situation, the controller can stop the fans if the
temperature at S5 exceeds a set limit value. The fans will start running again when the S5 temperature has dropped
2K below the set limit. (The function can also be used as a type of MOP function. Here the load on the compressors
is limited until the S5 temperature has fallen below the congured value).
ECO operations (only with custom set-up)
Reduced fan speed is permitted when the night blind is down. (Fan with changeover between high and low speed).
ECO operation is not permitted if the heat function is activated.
Light function
The function can be used for controlling the light in a refrigeration appliance or in a cold room. It can also be used
for controlling a motorised night blind.
The light function can be dened in several ways:
• The light is controlled via a signal from a door contact. The light is kept on for a set time after the door has been
closed.
• The light is controlled via the day/night function
• The light is controlled via a DI input or remote light control from a system manager.
• The light is controlled via the data communication from a system manager.
© Danfoss | Climate Solutions | 2021.02 BC364229688105en-000101 | 17
AK-CC55 Single Coil and Single Coil UI
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