Temperature Control; Food Temperature Sensor; Temperature Monitoring; Thermostat Bands - Danfoss AK-CC55 User Manual

AK-CC55 Single Coil and Single Coil UI
Table 3: Liquid injection
Dry expansion (MSS Control)
 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 or two temperature sensors which are located in the return air
before the evaporator (S3) or after the evaporator (S4) respectively. A setting for the thermostat, night thermostat,
alarm thermostat and display reading determines how much the two sensor values should influence each individual
function, e.g. 50% of S4 will produce an equal value from both sensors.
The actual temperature control can take place in two ways:
1. As an ordinary ON/OFF regulation with a differential, or
2. As a modulating control where the temperature variation will not be nearly as high as in ON/OFF control
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 4: Control methods

Food temperature sensor

A separate optional product sensor S6, which may be placed in the appliance, can also be used and can register and
monitor the food temperature in the appliance. There are separate alarm limits and time delays for the product
sensor.

Temperature monitoring

Just as is possible for the thermostat, the alarm monitoring can be set with a weighting between S3 and S4 so that
you can decide how much the two sensor values should influence the alarm monitoring. Minimum and maximum
limits can be set for alarm temperature and time delays. 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.

Thermostat bands

Thermostat bands can be used beneficially for appliances where different product types are stored, which requires
different temperature conditions. It is possible to change between the two different thermostat bands via a contact
© Danfoss | Climate Solutions | 2021.02
ON/OFF control
Adaptive liquid control (ALC)
Modulating control
BC364229688105en-000101 | 10