Hydraulic Components

SDC / DHC

 

 

7.1.8Operation for modulating burners

Modulating burners are controlled in a way similar to mixed heating circuit control, through a PI control algorithm, since in this case an actuator integrated in the burner regulates the air/fuel ratio according to the heating power. However, in contrast to the control of conventional burners, operation of modulating burners is subject to the following criteria:

Switching differential In contrast to conventional ON/OFF burner control systems with their switching differentials symmetrical around the respective setpoint temperature, the switching differential for modulating burners is an asymmetric interval with the switch-on level always 1 K below the setpoint temperature. This offers the advantage that, in case of another possible overshoot through the P part, the burner is not switched off, because the switch-off point lies above the setpoint by a wider margin than the switch-on point is below the setpoint (overshoot reserve). Also, when the heat demand is low (especially in the low-load area) the temperature will drop only slightly since the burner is switched on again as soon as there is a deviation of more than 1 K.

Example:

Set nominal temperature = 50 K

Switching differential = 6 K

Switch-on at (50°C - 1 K) = 49°C

Switch-off at (49°C + 6 K) = 55°C

x

a

y

b

a

Switch-off level

x

Deviation (K)

b

Switch-on level

y

Setpoint value

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EN2H-0221GE51 R0808

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Honeywell EN2H-0221GE51 R0808 service manual Operation for modulating burners, Example
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EN2H-0221GE51 R0808 specifications

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