[HydCrtC21] Hydraulic circuit for cooling, flow temperature control
Program block, name / node subtype: [HydCrtC21] Hydraulic circuit for cooling, flow temperature control
Library hierarchy: Cooling and refrigeration equipment
Family: HydCrtC
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Configurator
Program blocks are stored in the library without I/Os. Use the auto-create and auto-connect functions to create I/Os and/or to connect them to the interface blocks, e.g., R_A, CMD_B. Alternatively, take the I/Os from the folder containing the predefined I/Os in the library and/or from the plant and connect them to the interface blocks.
Controls the flow temperature.
The program receives a setpoint for the flow temperature for cooling and displays it on BACnet with a calculated value object. It contains a PID controller that changes the valve position to control the flow temperature. The pump runs when the function is on.
A parameter in the program defines if the plant stops when the flow temperature sensor has a fault.
This program block has the following optional functions:
Option: Chilled water demand
Generates a chilled water demand and displays it on BACnet with a calculated value object.
Option: Pump activation at low outside temperature
The pump always runs below a certain limit for the outside temperature. This is to increase the frost protection.
Option: Return temperature (1xAI)
Creates an analog input for the return temperature and reads its signal. It can generate an alarm (high and low limit).
Option: Switch-off delay for pump
Defines a switch-off delay for the pump. It is preset to be short and is parameterizable in the program.
Name | Description | Type | Alarm / Notification class | Trend / Type |
|---|---|---|---|---|
Pu | Pump | N/A | N/A | |
Vlv | Valve | N/A | N/A | |
Further elements that belong to this element: TCtr | Temperature controller | Ctr: Controller | ||||
TFl | Flow temperature | AI: Analog input | Yes, 4 | Yes, 2 |
PrSpTFl | Present flow temperature setpoint | ACalcVal: Analog calculated value | No | No |
Name | Description | Type | Alarm / Notification class | Trend / Type | |
|---|---|---|---|---|---|
ChwDmd | Chilled water demand | BCalcVal: Binary calculated value | No | No | |
TRt | Return temperature | AI: Analog input | Yes, 4 | Yes, 2 | |
Description |
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Pump activation at low outside temperature |
Switch-off delay for pump |