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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
Parameter Range Function
Tmp stpt input 1
– Comfort
– Economy.
Applied temperature setpoint at the active input Ext control
input 1; enabled only for Tsp function = Steps+Tmp.
– Comfort setpoint.
– Economy setpoint.
Note: The present temperature setpoint is determined by the
value from Tmp stpt input 2 if both inputs are enabled.
Tmp stpt input 2
– Comfort
– Economy.
Applied temperature setpoint at the active input Ext control
input 2; enabled only for Tsp function = Steps+Tmp.
– Comfort setpoint.
– Economy setpoint.
See not for Tmp stpt input 1!
Off delay 0…23.0 [h]
Switch-off delay. Plant goes to auto mode after the delay.
Notes:
– Off delay = 0 ---> The present command is pending as long
as the impacted input is enabled. This is mandatory for
plant switches.
– Off delay > 0 ---> Is used exclusively for external buttons or
presence detectors that requires resetting the plant to auto
mode after a set period.
Fan steps
– Auto
– Off
– 1Step
– 2Step
– 3Step
Select fan step:
– Auto mode.
– Plant off.
– Plant operating in stage 1 (using setpoint stage 1 for analog
controlled plants).
– Plant operating in stage 2 (using setpoint stage 2 for analog
controlled plants).
– Plant operating in stage 3 (using setpoint stage 3 for analog
controlled plants).
Start/stop function
– Off
– On
Define input functions:
– Each pulse on the input start the Timer Off delay.
– The first pulse on the input starts the Timer Off delay and
sets the command. The next pulse resets to auto mode.
The same applies when the timer expires.
• Main Index > Configuration > Configuration 1 > Ext control input = One --->
Only input Ext control input 1 is enabled. The command set with fan steps is is-
sued when Ext control input 1 = On.
• Main Index > Configuration > Configuration 1 > Ext control input = Two --->
Both inputs Ext control input 1 and Ext control input 2 are enabled. In this case:
– Ext control input 1 = Off and Ext control input 2 = Off ---> Command = Auto
mode.
– Ext control input 1 = Off and Ext control input 2 = Off ---> Command = 1Step.
– Ext control input 1 = Off and Ext control input 2 = On ---> Command = 2Step.
– Ext control input 1 = On and Ext control input 2 = On ---> Command as de-
termined by fan step.
Fan steps function
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 42
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