Danfoss AK2-SC 255

168 AK2-SC 255 Reference Manual RS.8D.M1.22
2-3 Using the Smart Case Controller Screens
The AK2-SC 255 has special screens which allow you to examine many functions in
each of the fixtures where Danfoss Smart Case Controllers are installed. Begin at
the status screen for a Smart Case fixture:
The first line of the screen body shows the fixture’s current status. This field may
contain any one of the following:
Normal Operation:
The Smart Case Controller is operating the fixture
normally in response to load conditions
Cut-out: (AKV valves) Fixture temperature is below target
range minimum. The valve percentage will hold at
zero (closed). The evaporator will remain in this
status until fixture temperature rises to target, when
the status will change to Start-up.
Start-up: (AKV valves) The evaporator enters this status
following any state when the valve has been closed,
including Cut-out, Defrost, Low superheat, and
any manual shutdown.
During Start-up, the valve opens a predetermined
percentage for a maximum of 2 minutes to establish
minimum superheat (a minimum positive temperature
differential between evaporator inlet and outlet).
When minimum superheat is reached, the status will
change to Cut-in.
Cut-in: (AKV valves) This status always follows Start-up; it