Danfoss AK2-SC 255, Reference Manual, Page: 81 / 206

80 AK2-SC 255 Reference Manual RS.8D.M1.22
Average: Control will be based on the average of all
the temperature sensors in the unit’s zone.
Zone Temp 1-1 (etc.): (each zone temperature
sensor will be available as a choice in the list) Control
will be based on the single selected temperature
sensor.
Num of cooling stages (0 to 6) The number of cooling stages in this HVAC
unit. Includes the number of outside air coils.
Num of outside air coils (0 to 2) The number of outside air coils in this HVAC
unit.
Consider dewpoint (List box: Yes, No) If Yes is chosen, the leaving air
temperature at the outside air coil needs to be less
than outside dewpoint for the coil to be active.
OA Coil LAT low limit (20.0 to 60.0) The leaving air temperature at and
above which outside air coils are enabled.
Enable OA Coil #1 above (40.0 to 95.0) (Question is repeated for OA coil #2, if
present) The leaving air temperature at and above
which the named outside air coil 1is enabled.
Target temp. for stage (0.0 to 100.0) (One target per cooling stage excluding
outside air coil stages) The target temperature that
you want the first stage to maintain at the zone sensor.
Range +/- (0.0 to 9.9) The range selected creates a dead band.
For example, if the target is 72 and the range is 2, the
stage will come on at 74, and will not be turned off
until the temperature reaches 70.
Pre delay for stage (0 to 60) (One setting per cooling stage.) The number
of minutes that must elapse after target plus range is
reached before the stage will come on.
Post delay for stage (0 to 60) (One setting per cooling stage.)The number
of minutes that must elapse after target - range is
reached before the stage will be turned off. There is
one field for each stage.
RTC
configuration
The Danfoss RTC control board can function as a stand-alone or as a node on the I/O
network of an SC 255 system. To begin configuration, select RTC as the type of unit
in the Configure HVAC menu. A menu for the unit is then presented by the system.
Selecting Fan from the unit brings up the first fan configuration page, shown on the
left below; the second page is shown at the right.