Multiple Boiler Control

Dcs plc or computer controlled smart instruments linked together by a communication data bus.

Multiple boiler control.

With a multiple boiler programmable controller such as the merley sequence controller the appropriate number of boilers can be set up to fire and modulate together to accurately respond to variations in demand in the most efficient manner in this way we can increase overall plant efficiency with improved load matching of the entire boiler plant to the building s. When connecting the ems input to the rj45 modbus port the multiple boiler sequencer function cannot be done by the control and must be supplied by others. Performance use tekmarnet communication to stage multiple heat sources optimize system operation and provide remote monitoring and alerts capability. Selecting multiple boilers maximizes your energy savings and provides.

I like indoor reset over outdoor reset for multiple reasons. Alternate supply of the multiple boiler sequencer is the ems using modbus or 4 20ma as discussed above or a third party device such as manufactured by tekmar or heat timer. It can be used in applications ranging from a single zone of baseboard multiple baseboard and fan coil zones to dedicated domestic hot water heating in commercial buildings. That control will also rotate the boilers.

Utica boilers are piped in primary secondary arrangement and the mbc control automatically selects how many boilers are needed to maintain the required heating load. In this case each boiler has its own boiler master which is an auto manual station that accepts the plant master s output applies a ratio and bias and sends the result out as the demand signal to the combustion controls. The communication data bus passes significant data between the digital control systems in a serial format. Boiler staging if you use a tekmar control that should do the job.

You can then use outdoor reset and indoor reset. A tekmar 275 should do fine. In multiple parallel boiler arrangements the plant master must output to each boiler s combustion controls. There are numerous bus architectures available.

The utica boilers multiple boiler control mbc operates up to four boilers and resets the heating system water temperature based on outdoor air temperatures. The boiler control 274 is designed to stage multiple boilers using outdoor temperature reset. Master and central control of multiple boilers for overall system load control reduces boiler on off cycling due to system load management incorporates lead lag or unison modulation for steam or hot water boiler systems. Select your level of control classic stage multiple heat sources to provide outdoor temperature reset for hydronic heating and domestic hot water generation.

If the demand is for space heating the controller typically determines its target temperature using outdoor reset logic.