[DhwCrgCrt21] Domestic hot water, charge circuit, internal heat exchanger
Program block, name / node subtype: [DhwCrgCrt21] Domestic hot water, charge circuit, internal heat exchanger
Library hierarchy: Heating equipment
Family: DhwCrgCrt
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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.
The charge circuit switches on when a domestic hot water storage tank demands charging.
The optional pump is switched on and an optional PID controller controls the flow temperature by comparing it to a setpoint and opening and closing a mixing valve.
This program block has the following optional functions:
Option: Pump (1xBO, 4xBI)
Controls a pump (Pu21).
The pump switches on when the charge circuit is switched on.
Option: Valve (1xAO, 1xAI)
Controls a valve (Vlv24).
A PID controller for the flow temperature control belongs to this option too.
This option can only be applied successfully together with the optional flow temperature.
Option: Charge priority
Gives priority to the charge circuit when it is on and it cannot reach its setpoint by decreasing the power of parallel consumers.
A PID controller compares the reduced flow temperature setpoint, e.g., by -5 K, with the flow temperature. Its inverted output is shown on BACnet and read by other plants, e.g., heating circuits for pre-control or radiator heating.
This option can only be applied successfully together with the optional flow temperature.
Option: Flow temperature (1xAI)
Creates an analog input for the flow temperature and reads its signal.
Option: Return temperature (1xAI)
Creates an analog input for the return temperature and reads its signal.
Name | Description | Type | Alarm / Notification class | Trend / Type | |
|---|---|---|---|---|---|
HwDmd | Hot water demand | BCalcVal: Binary calculated value | No | No | |
PrSpTFl | Present flow temperature setpoint | ACalcVal: Analog calculated value | No | No | |
Name | Description | Type | Alarm / Notification class | Trend / Type |
|---|---|---|---|---|
TFl | Flow temperature | AI: Analog input | Yes, 4 | Yes, 2 |
Vlv | Valve | N/A | N/A | |
Further elements that belong to this element: TCtr | Temperature controller | Ctr: Controller | ||||
Pu | Pump | N/A | N/A | |
| Charge priority | |||
Further elements that belong to this element: LmCtrCrgPrio | Limitation controller for charging priority | Ctr: Controller LmCrgPrio | Limitation for charging priority | ACalcVal: Analog calculated value | ||||
TRt | Return temperature | AI: Analog input | Yes, 4 | Yes, 2 |