5-46 • Site Supervisor Controller User Guide 2.0 026-1800 Rev 3 02-AUG-2016
For the Condenser Fan On Delay setpoint, fans are
cycled ON when the TD is above the setpoint at the rate
set for Condenser Fan On Delay. For example, if this field
is set to 30 seconds, each fan is staged ON in 30-second
intervals until all fans are ON, or until the TD falls back
below the setpoint.
For the Condenser Fan Off Delay setpoint, fans are
cycled OFF when the TD is below the setpoint at the rate
set for Condenser Fan Off Delay. In other words, if this
field is set to 30 seconds, each fan is staged OFF in 30-sec-
ond intervals until all fans are OFF, or until the TD rises
back above the setpoint.
5.29.6 Inputs
The Drop Leg Temperature input is the current drop
leg temperature used for TD control.
The Plenum Temperature input provides the current
value of the ambient temperature used for TD calculation.
5.29.7 Alarms
For Drop Leg High alarm, the alarm setpoint is the
drop leg temperature that, if exceeded, will cause an alarm
to be generated. If you wish to generate an alarm for high
drop leg temperature, enter the desired setpoint. Other-
wise, to disable this alarm, leave the value set to NONE.
For Drop Leg Delay, if the drop leg alarming feature
is used, enter the amount of time the drop leg temperature
must be higher than the setpoint before an alarm will be
generated (HHH:MM).
For TD High alarm, the TD alarm setpoint is the value
of the TD calculation that, if exceeded, will cause an alarm
to be generated. If you wish to generate an alarm for high
TD, enter the desired setpoint. Otherwise, to disable this
alarm, leave the value set to NONE.
For TD Delay, if the TD alarming feature is used,
enter the amount of time the TD must be higher than the
setpoint before an alarm will be generated (HHH:MM)
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