Heatweb Controller Functions
Heatweb Controllers combine the power and simplicity of Node-RED for logic control, an array of inputs and outputs for controlling HVAC equipment, and the latest communications technologies including MQTT and mesh networking, to provide a general purpose equipment control system.
This page lists the current applications.
HIU Control
HIUs (Hydraulic Interface Units) provide hot water and central heating for properties, driven by heat supplied from a central source.
Components include:
- Control valves for hot water and central heating heat exchange processes (with feedback)
- Flow sensor(s)
- Temperature sensors
- Heating pressure sensor
- Heat meter
- Central heating pump (with feedback)
- Optional hot water return pump
A building may consist of 150 properties, each with an HIU, and each building may be part of a much larger estate.
Substation Control
Sub-stations are larger commercial HIUs - for connecting buildings to networks, or even whole estates to wider networks. The control functions are the same, however they typically require two controllers for redundency, each controlling independent heat exchange circuits, combining to provide duty/assist/backup operation.
Pump and Boiler Management
Pumps and Boilers are very similar - they are combined in groups to meet variable loads, and each generally have the following interfaces:
- Volt free run input
- Volt free fault output
- 0-10v control signal
- Modbus control (superceeds above for control with manual run left as safety interupt)
They will also require additional sensors to confirm operation:
- Temperature sensors (for boilers)
- Differential pressure sensors (for pumps)
Preferably, each pump or boiler will have a dedicated controller for redundency, communicating to provide duty/assist operation to meet targets.
The Node-RED environment allows the standard logic to be tailored to suit different environments and targets.
