Danfoss AK2-SC 255, Reference Manual, Page: 137 / 206

136 AK2-SC 255 Reference Manual RS.8D.M1.22
SC4 Smart Coil (Seasons4) unit.
CT65 ClimaTECH 65 HVAC controller.
CT1024 ClimaTECH 1024 controller
Carrier Carrier Centurion or Premier Link unit.
We will review each of the alarm types for AHU, RTU, and SC4 systems, which
have almost identical alarm sets. Then we will discuss the alarms that appear only for
RTC and ClimaTECH systems.
AHU, RTU, and
SC4 alarms
These are typical alarms screens. None of the default parameters have been
changed. In an actual store, you would probably adjust them.
High zone temp
Occurs when zone temperature is above a set temperature -999.9° to 999.9° for a
period of from 1 to 9999 seconds, minutes, or hours.
Low zone temp
Occurs when zone temperature is below a set temperature -999.9° to 999.9° for a
period of from 1 to 9999 seconds, minutes, or hours.
High humidity
Occurs when zone humidity is above a set percentage (the field takes values from -
999.9 to 999.9) for a period of from 1 to 9999 seconds, minutes, or hours.
High supply temp
Occurs when supply temperature is above a set temperature -999.9° to 999.9° for a
period of from 1 to 9999 seconds, minutes, or hours.
HVAC fan down
A digital alarm that can be enabled to occur when the system fan is called to run and
fails to show proof (digital monitor fails to read ON) within the time period specified in
the alarm (1-9999 seconds, minutes, or hours).
HVAC smoke (if a smoke detector is configured)
A digital alarm that can be enabled to occur when a smoke detector reads ON for a
specified time period (1 to 9999 seconds, minutes, or hours).
HVAC fire (if an HVAC fire stat is configured)
A digital alarm that can be enabled to occur when a fire stat monitor reads on for a
specified time period (0-9999 seconds, minutes, or hours).