Temperature Monitoring; Thermostat Bands; Night Setback Of Thermostat Value; Appliance Cleaning - Danfoss AK-CC55 User Manual

User Guide | Controller for appliance control, AK-CC55

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 after defrosting,
appliance cleaning and start-up.
For the Multi Coil version, only the S4 sensor will be used for each
section.

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 signal on a digital input.
Separate thermostat and alarm limits can be set for each
thermostat 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 connected to a digital input.
• via a signal from the data communication system.
Food temperature sensor (only in Single Coil version)
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.

Appliance cleaning

This function makes it easy for the shop's staff to carry out a
cleaning of the appliance according to a standard procedure.
Appliance cleaning is activated via a pulse signal – as a rule via a
key switch placed on the appliance.
Appliance cleaning is carried out via three phases:
1. At the first activation the refrigeration is stopped, but the fans
keep on operating in order to defrost the evaporators. "Fan" is
shown on the display.
2. At the second activation the fans are also stopped and the
appliance can now be cleaned. "OFF" is shown on the display.
3. At the third activation refrigeration is recommenced. The
display will show the actual appliance temperature, (o97
setting).
When appliance cleaning is activated, a cleaning alarm is trans-
mitted to the normal alarm recipient. A later processing of these
alarms will document that the appliance has been cleaned as
often as planned.
Alarm monitoring
There are no temperature alarms during appliance cleaning.
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.
40 | BC308437742037en-000101
- +
1 ÷
2 ÷
3 +
+ °C
+ Fan
÷ Off
+ °C
© Danfoss | DCS (vt) | 2019.09