AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 5
Thermostat bands
Thermostat bands can be used benecially for appliances where
dierent product types are stored which require dierent tem-
perature conditions. It is possible to change between the two
dierent 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 dierences
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 eect 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 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.
Appliance cleaning
This function makes it easy for the shop’s sta to carry out a
cleaning of the appliance according to a standard procedure.
Appliance cleaning is activated via a signal – as a rule via a key
switch placed on the appliance.
Appliance cleaning is carried out via three phases:
1 - at the rst 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
transmitted 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 shut-down
The function closes the solenoid valve and all outputs are
switched o.
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.
- + + °C
1 ÷ + Fan
2 ÷ ÷ O
3 + + °C
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