Siemens Climatix Series Basis Document page 45

Cooling demand
Heating demand
Note
Parameter
Parameter
Start stpt cooling
Cooling setpoint
Start stpt heating
Heating setpoint
Hysteresis
Minimum off time
Min run time
Prerequisite:
Function
Cooling demand
Heating demand
Note
Siemens
Building Technologies
The plant night start by temperature difference for cooling demand occurs when
the following conditions are met:
– Room tmp > Start stpt cooling und
– Timer Minimum off time = 0
The shutdown occurs for:
– Room tmp < Start stpt cooling - Hysteresis
The plant night start by temperature difference for heating demand occurs when
the following conditions are met:
– Room tmp > Start stpt heating und
– Timer Min off time = 0
The shutdown occurs for cooling demand occurs for:
Room tmp > Start stpt heating + Hysteresis
The function when the room temperature sensor (return air sensor) fails.
Main Index > Unit > Operating mode > Tmp start
Range Function
-64.0....64.0 [°C] Start temperature for cooling.
-64.0....64.0 [°C] Cooling setpoint.
-64.0...64.0 [°C] Start temperature for heating.
-64.0....64.0 [°C] Heating setpoint.
0.1...64.0 [°C] Shutdown hysteresis.
0...999 [min] Minimum switch-off time after active heating or cooling.
0.0.....999.0 [min] Minimum runtime after a start.
5.2.8 Boost function (boost plant start)
Boost is enabled:
Main Index > Configuration > Configuration 2 > Boost <> No
Boost ensures a comfortable room temperature when the plant is switched on nor-
mally.
The heating and or cooling start can be enabled separately:
Main Index > Configuration > Configuration 2 > Boost
The function can be implemented using a return air sensor if no room sensor is
available.
Boost for cooling demand occurs when the following conditions are met:
– Room tmp > Start stpt cooling + Hysteresis and
– Time to normal start via the time switch program < Compensation time
The shutdown occurs for:
– Room tmp < Start stpt cooling
Boost for heating demand occurs when the following conditions are met:
– Room tmp < Start stpt heating - Hysteresis and
– Time to normal start via the time switch program < Compensation time
The shutdown occurs for:
– Room tmp > Start stpt heating
The function when the room temperature sensor (return air sensor) fails.
Basis Document Siemens Climatix Control System
Standard application AHU
BDCX.100820.01GB
Functions
45 / 244
CE1P3977en_02
Page 45
01.02.2010