Danfoss AK2-SC 255, Reference Manual, Page: 29 / 206

28 AK2-SC 255 Reference Manual RS.8D.M1.22
165 Subcooling Controller is not used) configuration begins by selecting AK2-SC 255/
SUBC in the Type column for the circuit on the Evaporator Menu, then moving the
cursor to the word Setup for that evaporator and pressing ENTER. A screen like the
one at left below will appear. The same screen with all its fields revealed appears as
at right.
The fields are as follows:
Number of valves (0 to 2) The number of valves used for subcooling.
Number of stages (1 to 3) With one valve, there can be only 1 stage of
subcooling. With two valves, there can be two stages
(one valve open or two). If there are two valves
feeding subcoolers of different capacities, then there
can be three stages (only valve 1 open, only valve 2
open, or both valves open).
Cutin setpoint (0.0 to 120.0, each stage has a separate setpoint) The
temperature at which the subcooling stage will become
active. Temperature is measured by a sensor at the
liquid outlet of the subcooler.
Cutout setpoint: (0.0 to 110.0, each stage has a separate setpoint) The
temperature at which the subcooling stage will shut
down.
Minimum ON time (0 to 255) The minimum time in minutes each stage
must remain active after being cut in.
Minimum OFF time (0 to 255) The minimum time in minutes each stage
must remain off after being cut out.
Configuring
AK2-SC 255
refrigeration circuits
If there is not a distributed controller at the fixture (AKC 161, AKC 164, Degree
Master, or DCU), refrigeration can be controlled directly by the AK2-SC 255. Con-
figuration of such circuits starts by selecting AK2-SC 255 in the Type column for the
circuit on the Evaporator menu, then moving the cursor to the word Setup for that
evaporator and pressing ENTER. A screen like the one at left below will appear. The