Danfoss AK2-SC 255, Reference Manual, Page: 32 / 206

RS.8D.M1.22 AK2-SC 255 Reference Manual 31
[Defrost time settings made on this and the following pages work with the
termination settings on the preceding page. If a minimum defrost time is used,
that time must elapse AND the settings for defrost termination temperature or
switch must be satisfied. If a defrost duration is specified, either that time must
elapse OR the requirements set on this page must be satisfied for defrost to
terminate.]
The fields are as follows:
Use min defrost time (List box: Yes, No) Whether or not minimum defrost
time will be used.
Minimum defrost time (1 to 180) The number of minutes defrost must be on
before termination.
Antisweat control (List box: Yes, No) Whether or not anti-sweat heaters
will be controlled by the AK2-SC 255. When you
configure an evaporator and answer Yes to the anti-
sweat control question, a relay output is created which
is then wired to a relay controlling the anti-sweat
heaters. The name of the relay output will be
“Antisweat” + the name of the evaporator or circuit,
then the rack, suction group, and circuit number (for
example, Produce AA3).
ON when dewpoint above (0.0 to 100.0) The dewpoint above which anti-sweat
heaters will be on constantly.
Cycle above dewpoint (0.0 to 100.0) The dewpoint above which anti-sweat
heaters will be cycled. Cycling will occur unless the
dewpoint rises above the setpoint.specified in the
previous line.
Antisweat cycle time (2 to 999) The time interval on which anti-sweat
cycling is based.
Fan control (List box: Yes, No) Answer Yes if fans are to be
controlled during and after defrost. If you answer No,
fans will run continuously during both refrigeration and
defrost.
Fans on during defrost (List box: Yes, No) The answer determines whether or
not fans will run during defrost.
Stop fan on high temp (List box: Yes, No) Whether or not fans are to be
stopped when temperature rises above a setpoint to be
specified in the next line.
Fan stop temp (-58.0 to 99.9) The temperature at which fans will be
stopped.
Fan delay control (List box: Yes, No) A Yes answer will cause fans to
remain off after defrost termination for a specified
period of time or until a specified temperature is
reached. The time or temperature is determined by the
next two questions.
Start fan on time (List box: Yes, No) The answer determines whether or
not fan delay ends after a specified time.
Delay time (0 to 20) The number of minutes before fans start
after defrost terminates.