Boiler Modulation Control

This easy to use boiler modulating control from weil mclain can control up to four modulating water boilers.

Boiler modulation control.

Either with boiler units that have appropriate turn down or by using. 4 all the burner management and combustion control systems can be tied into a single platform including the level control and the vfd drive s. A typical raypak modulating boiler equipped with an outdoor reset control will lose less than 2 thermal efficiency across its full range of fire. Boiler manufacturers commonly now have their own modulating thermostats that are also available as smart thermostats.

The type of control and balancing solution directly influences the precision of temperature control global flow and the pump head. Not only does this. Unless the heat exchanger area and excess air ratio are exactly varied to match the firing rate an expensive and complicated proposition all boilers will exhibit similar characteristics. The ratio of the low fire to high fire rates is defined as the boiler s turndown capability.

This chapter discusses control loops as they relate to boilers dealing with the following issues. Most modern designs have a level of modulation embedded in their design. Modulating the feedwater flow to the boiler has so many advantages over on off feedwater addition it is difficult to visualize any other system. Modulating the feedwater to the boiler is the most important part of the boiler feedwater system.

Why would you modulate the boiler firing rate. Vaillant has vsmart worcester bosch has wave etc. Boilers with modulating firing controls are quite common. Modulating control improves boiler operation by monitoring the steam or hot water line to produce a continuous control signal that determines the fuel input.

There are also exist independent smart control manufacturers such as nest and honeywell evohome that produce opentherm compatible modulating controls. 4 with a plc based control system as shown in fig. On fan equipped boilers modulation is accomplished by reducing the air and gas flow into the boiler. Modulating control in a power plant is extremely important.

It is always advisable that the designer frame a basic control philosophy before developing a control loop. Reductions in steam pressure or water temperature lead to an increase in firing rate.