Temperature Control; Temperature Monitoring - Danfoss AK-CC55 Multi Coil User Manual

AK-CC55 Multi Coil
Figure 8: Adaptive liquid control with AKV valve
A level switch in the tank will register when the liquid level exceeds the max. level. When this happens, the
controller will switch to dry expansion, and then back to liquid control when the liquid level has dropped. The
function is defined in setting o02, o37 or o84.
The function can also be activated via data communication from a system unit. If the adaptive liquid control signal is
lost, the controller will automatically switch back to dry expansion.
 WARNING:
Accidental actuation may allow liquid throughput to the compressor. It is the installer's responsibility to ensure that
signal loss to the controller will not result in liquid throughput to the compressor. Danfoss accepts no responsibility
for damage resulting from inadequate installation.

Temperature control

The temperature in the appliance is registered by one up to three S4 air temperature sensors.
The actual temperature control can take place in three ways (same thermostat set point used for all evaporators):
1. As an ON/OFF regulation with a differential using the individual S4 sensor per evaporator.
2. As a modulating control, using the individual S4 sensor per evaporator.
3. As one ON/OFF thermostat common for all evaporators. It can be selected to use:
◦ the S4A air temperature sensor,
◦ the average of all S4 air temperature sensors,
◦ the highest value of all S4 air temperature sensors for the common thermostat.
There is, however, a limit to the use of a modulating control as it can only be used in remote cabinets. It is not
recommended to use modulating thermostat control in low temperature applications. In applications with one
evaporator and one compressor the thermostat function with ON/OFF control should be selected. In remote
cabinets, the thermostat function may either be selected for ON/OFF control or modulating control.
Table 3: Control methods

Temperature monitoring

The individual S4A, S4B and S4C air sensors are always used for temperature alarm monitoring independent of
which sensor is defined as thermostat sensor. Common settings for High temperature limit, Low temperature limit
and alarm delays are used for all 3 sensors, and alarms are generated for each individual evaporator section. A
longer time delay can be set for high temperature alarm. This time delay is active for pull-down after defrosting,
appliance cleaning and start-up.
© Danfoss | Climate Solutions | 2022.08
ON/OFF control Modulating control
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