Siemens Climatix Series User Manual

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Siemens Standard application AHU CE1P3977en_02
Building Technologies Functions 01.02.2010
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
Parameter Range Function
Start stpt cooling
-64.0….64.0 [°C] Start temperature for cooling.
Cooling setpoint -64.0….64.0 [°C] Cooling setpoint.
Start stpt heating -64.0…64.0 [°C] Start temperature for heating.
Heating setpoint -64.0….64.0 [°C] Heating setpoint.
Hysteresis 0.1…64.0 [°C] Shutdown hysteresis.
Minimum off time 0…999 [min] Minimum switch-off time after active heating or cooling.
Min run time 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.
Cooling demand
Heating demand
Note
Parameter
Prerequisite:
Function
Cooling demand
Heating demand
Note
Basis Document Siemens Climatix Control System
BDCX.100820.01GB
Page 45

Siemens Climatix Series Specifications

General

Application	HVAC control
Communication Protocols	BACnet, Modbus, KNX
Inputs	Analog and digital inputs
Outputs	Analog and digital outputs
User Interface	web interface
Power Supply	24 V AC
Protection Class	IP20
Mounting	DIN rail mounting