Temperature control
The temperature in the appliance is registered by one or two
temperature sensors which are located in the air flow before the
evaporator (S3) or after the evaporator (S4) respectively. A setting
for the thermostat, alarm thermostat and display reading deter-
mines how much the two sensor values should influence each
individual function, e.g. 50% will produce an equal value from
both sensors.
There are separate settings for day operation and night operation.
Temperature monitoring
Just as it 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 alarms after defrosting, appliance cleaning or
start-up.
Thermostat bands
Thermostat bands can be used beneficially for appliances where
different product types are stored which require different tem-
perature conditions. It is possible to change between the two
different thermostat bands via a contact signal on a digital input.
Separate thermostat and alarm limits can be set for each thermo-
stat band – also for the product sensor.
Night setback of thermostat value
In refrigeration appliances there may be big load differences
between the shop’s opening and closing hours, especially if night
lids/blinds are used. The thermostat reference may be raised here
without it having any effect on the product temperature.
Change-over between day and night operation can take place, as
follows:
• via an external switch signal.
• via a signal from the data communication system.
Product sensor
A separate optional product sensor S6, which may be placed in the
appliance, can also be used and which can register and monitor
the temperature in the warmest part of the appliance. There are
separate alarm limits and time delays for the product sensor.
S7 brine sensor
The temperature at the brine inlet is monitored by the S7
temperature sensor. If the temperature gets higher than the set
value, the controller will reduce the cooling capacity, so that the
load on the heat exchanger is reduced.
For two-compressor operation, compressor 2 will be taken out of
operation.
With variable speed control the compressor speed will be reduced
to the value defined by parameter "c93".
User Guide | Controller for SemiPlugin appliance, AK-CC 460
4 | BC230086440483en-000201
© Danfoss | DCS (vt) | 2019.12