Siemens RWF50.3 User Manual page 30

Cooling controller
Example
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Building Technologies Division
Infrastructure & Cities Sector
Cold start of plant also works when the RWF50... is used as a cooling controller.
In that case, the limit value is calculated as follows:
Limit value = 2 x (HYS4-HYS6)
Operating mode: Modulating 3-position output
HYS4 = 5 K
HYS6 = -5 K
w = -30 °C
Limit value = 2 x (5 +5) = 2 x (10) = +20 K
When the actual value lies above -10 °C, cooling is immediately started in high-fire
mode in place of low-fire mode.
User Manual RWF50...
5 Operating modes
CC1U7866en
25.07.2014