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Building Technologies Division User Manual RWF50... CC1U7866en
Infrastructure & Cities Sector 5 Operating modes 25.07.2014
5.7 Thermal shock protection (TSS)
Note!
Functions Cold start of plant and Thermal shock protection (TSS) are interlocked.
Only one function can be activated, but never both at the same time.
The controller comes with thermal shock protection (TSS) deactivated; it can be
activated at the configuration level.
Reference!
See chapter 8.3 Thermal shock protection (TSS) rAFC.
The function is automatically activated when the actual value drops below the
adjustable limit value rAL (exceeds the adjustable limit value with the cooling controller).
In that case, the setpoint is approached via a ramp function.
Gradient and slope of the ramp
rASL are adjustable. The setpoint ramp has a
symmetrical tolerance band toLP. If, during the startup phase, the actual value leaves
the tolerance band, the setpoint ramp is stopped until the actual value returns to a level
within the tolerance band. The startup phase is ended when the setpoint of the ramp
function reaches the final setpoint SP1.
Note!
When thermal shock protection (TSS) is active, the controller operates in low-fire
operation. The response threshold (q) is active.
tt1
t2
SP1
toLP
rAL
t3 t4
Temperature
7866d20e/0212
Figure 15: Thermal shock protection (TSS)
Key
Setpoint (w)
Actual value (x)
Interlocking
Function
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