Application

Sequence of Operation
Room Temperature and CTL TEMP
7
Siemens Industry, Inc. Application Note, App 2051 140-1137
2014-05-01
CTL STPT is calculated as follows:
With Deadband Disabled:
CTL STPT = Dial value
With Deadband enabled in Heat Mode:
CTL STPT = Dial value – 0.5 ∗ Deadband (limited between the value of RM STPT MIN
and RM STPT MAX)
With Deadband enabled in Cool Mode:
CTL STPT = Dial value + 0.5 ∗ Deadband (limited between the value of RM STPT MIN
and RM STPT MAX).
NOTE:
If RM STPT DIAL is failed, it maintains the last known value.
Room Temperature and CTL TEMP
ROOM TEMP is the temperature that is being sensed by the room temperature sensor
(RTS).
CTL TEMP is the room temperature that is used for control purposes. In other words,
what the application is trying to do is to maintain CTL TEMP at the control setpoint.
If CTL TEMP is overridden then:
l CTL TEMP equals its overridden value and ROOM TEMP has no effect on the
value of CTL TEMP.