30 AK2-SC 255 Reference Manual RS.8D.M1.22
temperature and the range about the target, used in
temperature control. The range is the amount above or
below target that the actual sensor temperature is
allowed to change before a control action is taken.
Type of defrost (List box) Various types of defrost can be chosen:
None, Hot Gas, Time Off, Air, or Electric.
Drip down delay (1 to 600) The number of seconds that refrigeration
will remain off after termination of defrost.
Termination type [Defrost time settings made on the pages that follow
must also be considered. If a minimum defrost time
is used, that time must elapse regardless of the
settings made on this page. 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.]
(List box) Various termination strategies are listed.
Defrost sensor There is a dedicated defrost tem-
perature sensor that will be used to terminate defrost.
Disch air snsr The fixture discharge air sensor will
be used to terminate defrost at a set temperature.
On/Off Input An electrical switch (such as a Klixon
®
is wired to a digital input (on-off input) and will be used
to terminate defrost.
None: Defrost is terminated strictly on time.
Hot gas return: Hot gas defrost is terminated when a
return air sensor reaches a setpoint.
Termination temp (-99.0 to 200.0) The defrost temperature sensor value
at which defrost will terminate.
Term.relay for each case (List box: Yes, No) Whether or not there is a termina-
tion relay for each case.
Term.relay for each case (List box: Yes, No) Whether or not there is a termina-
tion input each case.
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