Danfoss AK2-SC 255 User Manual

46 AK2-SC 255 Reference Manual RS.8D.M1.22
connected by means of a 2-wire TP-78 LonWorks
card.
Min speed (1.0 to 150.0) The minimum percentage of the maxi-
mum RPM that the fan motors will be run. Insure that
the entries on this screen are within the manufacturer’s
specifications.
Max speed (1.0 to 150.0) The maximum percentage of the
maximum RPM that the fan motors will be run. Insure
that the entries on this screen are within the
manufacturer’s specifications.
RPM at max speed (1 to 6000) The number of RPM at the maximum
speed specified in the preceding setting.
Inverter max resets (10 to 10) The maximum number of inverter resets,
after which a subsequent reset condition will place the
inverter in override.
Inverter reset delay (1 to 600) The number of seconds that must elapse
between inverter reset attempts.
Inverter proof delay (1 to 600) The number of seconds without proof
before an inverter reset is attempted.
High pressure bypass (0.0 to 500.0) The pressure at and above which all
fans will be run, and at full speed if variable speed
motor control is used. (When high pressure bypass
occurs, a service technician is required to clear the
bypass by using the appropriate button in the status
screen.)
Freeze Protection (List box: Yes, No) Whether or not freeze protection
control is implemented.
Freeze prot temp cutout (-99.0 to 99.9) The outside ambient temperature at
and below which evaporative cooling will be locked
out.
Freeze prot temp cutin (-99.0 to 99.9) The outside ambient temperature at
and above which evaporative cooling will be allowed to
run.
Dump Valve (List box: Yes, No) Whether or not a dump valve is
controlled.
Dump on schedule (List box: Yes, No) Whether or not the dump valve will
be controlled by a schedule to be entered on the
following page(s).
Num of dump schedules (1 to 8) The number of effective dump schedules to be
entered on the following page(s).
Dump on freeze protect (List box: Yes, No) Whether or not the dump valve will
be activated at the freeze protect setpoint.
Overide pump on frz prot (List box: Yes, No) When the pump is on because of
high discharge pressure, whether or not to shut down
the the pump at the freeze protect setpoint.
Water flow monitor (List box: Yes, No) Whether or not there is a water
flow monitor.
Dump schedules The next page allows entry of the first four dump schedule. A subsequent page will be
added if there are more than for schedules. Schedules have been explained in the

Danfoss AK2-SC 255 Specifications

General

Brand	Danfoss
Model	AK2-SC 255
Category	Controller
Language	English