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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
5.8.4 Heizregister-Frostschutz
Frost protection type is enabled:
Master Index > Configuration > Configuration 2, Htg frost protect<> No
Master Index > Configuration > Configuration 2, Heating 2 frost protect <> No
– For heat demand frost controller > Heat demand heating controller ---> The out-
put follows the frost controller.
– For heat demand frost controller < Heat demand heat controller ---> The output
follows the heating controller.
– Frost control remains active when the plant is off. (Building Protection).
– Controller is disabled when the sensor fails.
– For the “Frost” state (frost detector is triggered), the pump starts, the heating
valve opens to 100% and the plant is shut down and locked.
Master Index > Unit > Temp control > Heating > Frost protection
Master Index > Unit > Temp control > Heating 2 > Frost protection
Parameter Range Function
Controller 0...100 [%] Present value for the frost controlled. Go to con-
troller settings page.
Setpoint -64...64 [°C] – For one setpoint: Present setpoint for the frost
controller.
– For 2 setpoints: Present setpoint for the frost
controller, if the plant is operating.
Standby Setpoint -64...64 [°C] Present setpoint for the frost controller, if the
plant is not operating.
This value only exists on one of the following
settings is selected:
Master Index > Configuration > Configuration 2,
HtgFrost = Sensor2Spv oder 2Spv+Dtctr
5.8.5 Preheat heating register
Preheating is enabled:
Master Index > Configuration > Configuration 1, Heating = Yes+PreHeat
Master Index > Configuration > Configuration 1, Heating 2 = Yes+PreHeat
– The heating valve is 100% opened for the period "Pre htg on time" if the outside
air temperature is lower than "Outs air tmp X1" at plant start. The heating valve
then goes to the position defaulted by both auxiliary points and is released for
plant start.
– It assumes the present position after the complete heating controller is released.
– The function is blocked for the period "Min off time" after preheating is com-
pleted.
– The function is deactivated when the outside air temperature senor not activated
or fails.
Main Index > Unit > Temp control > Heating > Preheating
Main Index > Unit > Temp control > Heating 2 > Preheating
Parameter Range
Mode – On
– Off
Current status preheating.
Outs air tmp X1 -30.0...5.0 [°C] Lower design temperature.
Prerequisite
Function
Parameter
Prerequisite
Function
Parameter
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 76
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