Configuring Two-Stage Systems - Danfoss AK2-SC 255 System Reference Manual

Configuring
two-stage systems
RS.8D.M2.22
Setback holidays
At the bottom right of the Suction Info screen are the words "PG DN" for more.
Use the controller's PG DN key to reach the next screen; shown at left is the default
screen in which not all the questions and fields appear; the screen on the right shows
all the fields.
The fields and their contents are as follows:
Monitor suction temp
Display superheat temp
Monitor desuperheat temp (List box: Yes, No)
Close EEV valves during
rack shutdown
If suct above target by
Delay time
Rack on AK2-SC 255 address
Press EXIT to return to the Configure Rack Menu and continue refrigeration configu-
ration.
and de-superheaters If (and only if) a rack is configured as a two-stage system, the
suction configuration for each suction group will include a special page for the low
side. The screen looks like this:
AK2-SC 255 Reference Manual
(Holidays selection field) The holiday numbers on
which night setback will occur. Holiday numbers are
defined in Store Info configuration.
(List box: Yes, No)
(List box: Yes, No)
(List box: Yes, No)
(0 to 999.9) Number of psig above target when AKV
valves will be closed during rack shutdown.
(0 to 45) Number of seconds after suction pressure
reaches target + the number specified in the preceding
field that AKV valves will be closed.
(0 to 15) The address of the SC 255 controlling the
rack that serves these EEVs.
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