Danfoss AK-CC 550A - Application Details; Application 5; Application 9; Application 10

AK-CC 550A Manual RS8FS402 © Danfoss 2016-03 13
5
6
7
9
10
8
The following uses have some special functions
which in brief are:
Application 5
”Two-compressor” operation.
The two compressors must be of the same size.
On start-up (after defrosting, operational stop,
etc.) both compressors are started with a set time
shift. One compressor starts at half the dierential
so that an optimum adaptation of compressor
capacity takes place for the current load in the
appliance/room. There is automatic runtime
equalisation between the compressors.
For a more detailed description please refer to
earlier sections in the manual.
Application 6
Hot gas defrosting.
Hot gas defrosting is adapted to commercial
appliances/rooms with limited system lling.
One relay controls the main valve in the suction
line.
A changeover relay controls both the hot gas
valve and the drain valve.
This means that there is no time delay between
stops of hot gas and start of draining.
Application 7
Control of night blinds
Night blinds follow the status of the light function
– when the light is switched on, the night blinds
are up and when the light is switched o, the
night blinds are down. In addition a digital input
provides the option of forced opening of the
blinds so that the appliance can be lled with
products.
Application 8
Heat thermostat
The heat thermostat is typically used if the
temperature is to be controlled within narrower
limits, e.g. for cutting rooms, etc. The heating
thermostat can be set as a dierence in relation to
the cutout limit for the refrigeration thermostat so
that simultaneous refrigeration and heating are
avoided.
Application 9
Two refrigeration sections – two defrost outputs
This application is for refrigeration appliances with
one valve, two evaporators and two refrigeration
sections. The temperature is controlled and is
always alarm monitored according to the S4
temperature. For this the product sensor is used as
a defrosting stop sensor for evaporator no. 2.
Application 10
Two refrigeration sections – individual alarm/
display via S3
This application is for refrigeration appliances with
one valve, one evaporator and two refrigeration
sections. The temperature is always controlled
according to the S4 temperature. The product
sensor is used as an extra S3 sensor for section
no. 2. Alarm monitoring and display readings take
place individually via the "S3" sensors in each
refrigeration section.