Danfoss AK2-SC 255 Reference Manual page 37

36
Fan type
Number of fans
Fan staging
Monitor stages
Control sensor
AK2-SC 255 Reference Manual
None: There is to be no condenser control by the SC
255.
Evaporative: There are evaporative condensers that
are controlled by the AKC 55. Discussed in the next
section of the manual..
Air Cooled: The AKC 55 is controlling air-cooled
condensers. The remainder of this section (this screen
and the next four) pertains to this selection.
(List box)
Single Fan: The condenser has a single fan.
Multi. Fan: The condenser has multiple fans.
2-Speed: The condenser has a single 2-speed fan.
(0 to 12) The number of condenser fans.
(List box:)
Individual: Fans will be turned on and off individually
to create a number of stages equal to the number of
fans.
Paired: Fans will be turned on and off in pairs to
create a number of stages equal to half the number of
fans.
(List box:)
Individual: Fans will be monitored individually with a
digital input (on-off input) created for each fan.
Paired: Fans will be monitored in pairs with a digital
input created for each pair.
(List box)
Pressure: A pressure sensor will be used to control
the condenser fans. An analog input (sensor input) will
be created for the sensor.
Dropleg Temp: A temperature sensor placed on the
dropleg will be used to control the condenser fans. An
analog input (sensor input) will be created for the
sensor.
Sat Cond Temp: Control will be based on saturated
condensing temperature as computed from a pressure
sensor on the discharge header or drop leg. An analog
input (sensor input) was automatically created for the
suction group.
Avg Cond Temp: This option is provided to allow for
the control of a condenser that is being fed from
multiple racks controlled by the same AK2-SC 255.
Either dedicated pressure and temperature sensors can
be installed and configured, or clones of existing
discharge pressure sensors can be created in Miscella-
neous Calculations, and the clones used for average
condensing temperature control.
Number of sensors: (0 to 8) [appears only if Avg
Cond Temp is selected] The number of temperature
sensors being averaged.
Monitor dropleg temp (List box: Yes, No)
Whether the drop leg temperature will be monitored. A
RS.8D.M1.22