[HCChovr21] Heating/cooling changeover function
Program block, name / node subtype: [HCChovr21] Heating/cooling changeover function
Library hierarchy: Universal equipment
Family: HCChovr
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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.
Determines a heating or cooling state based on different conditions and sources.
The calculated heating or cooling state is displayed with a multistate calculated value and can be read from other functions, e.g., from the heating/cooling coil in an air handling unit.
HCChovr is used in the heating/cooling circuit plant (in HCcr21x in the program block HCcrPltMod21).
This program block has the following optional functions:
Option: Heating or cooling determination according to outside air temperature
Reads the outside air temperature, filters it, compares it with the temperature set with the configuration value object "Changeover point to cooling", and determines a heating or cooling state. This is coordinated with a heating or cooling request coming from other parts of the control program.
Option: Heating/cooling request
Interface prepared for a BACnet reference to an object that provides a heating/cooling request, likely in a different automation station.
Option: Heating/cooling switch (1xMI=2xBI)
Reads the signal from a switch for manual selection of heating or cooling state.
Option: Manual heating/cooling selection
Multistate configuration value for manual selection of heating or cooling state.
Option: Provide changeover condition to RDx thermostat
Interface to write to two BACnet objects for the logic for changeover condition for heating and cooling zone.
Option: Switch to heating upon frost protection
Interface to connect the signal for frost protection from the hydraulic circuit. This is an important option if HCChovr21 is used in a heating/cooling circuit plant.
Name | Description | Type | Alarm / Notification class | Trend / Type | |
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HCSta | Heating/cooling state | MCalcVal: Multistate calculated value | No | Yes, 4 | |
Name | Description | Type | Alarm / Notification class | Trend / Type | |
|---|---|---|---|---|---|
HCSwi | Heating/cooling switch | MI: Multistate input | No | Yes, 4 | |
HCSelMan | Manual heating/cooling selection | MCnfVal: Multistate configuration value | N/A | Yes, 4 | |
Description |
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Switch to heating upon frost protection |
Heating/cooling request |
Heating or cooling determination according to outside air temperature |