There are many situations where more than one level of control is required to achieve maximum control and energy savings. Boiler standby cycling is a common example of this.
Commercial boiler plant often has a number of control elements in place, including:
- Boiler sequencing
- Weather compensation
- Demand control
- Modulating burners
- Control of air to fuel ratio
These different aspects of control may be delivered through standalone control or via a building management system (BMS).
However, none of these controls are typically configured/programmed to detect and prevent boiler standby cycling.
Over 90% of M2Gs installed are to buildings and boilers where BMS is already in place.
Why doesn’t a BMS control standby cycling?
A BMS’s principle function is to control the building not each individual boiler. Where the BMS has been extended to control the heating demand i.e. demand control, sequencing and weather compensation it is typically controlled from the common header (the blended temperature of all boilers), rather than monitoring and controlling each individual boiler.
It is impossible to identify which boiler is standby cycling from the common header, therefore standby cycling will be occurring, resulting in unnecessary energy costs and CO2 emissions.
To configure the BMS to replicate M2G will require expensive bespoke programming, additional field wiring and it is likely the BMS outstation capacity will need to be increased. Our customers initially explore this option to discover their existing BMS does not have the capabilities to replicate M2G or the upgrade costs and bespoke programming greatly exceeds that of installing M2G.