You can use the cooling program, for example, in a multi-burner plant (a boiler with more than one burner) to cool the burner to prevent damage due to the effects of heat. The cooling program can perform the cooling function in the following ways:
The cooling program is automatically started when
In both variants, you must parameterize the compound channels required for the cooling program in such a way that the HMI can move it when the burner is OFF (see Channel function). Apart from that, you must activate and define the required cooling position for every compound channel.
Cooling program without Combustion Air Fan
In the simplest case, fresh air is fed to the burner by way of an external air duct. In this case, seavis compact moves the preselected compound channel to the predetermined position when the burner is not in operation.
Alternatively, the air supply can be regulated via a digital input channel. If the burner is not in operation, the compound channels only move to the set position when this channel receives an input signal.
Cooling program with Combustion Air Fan
If the cooling program with combustion air fan is to be used, then you must configure additional digital input and output channels because the combustion air fan is controlled via a separate digital output channel.
In addition, you have to configure the air supply via a digital input channel. If the burner is not in operation, the compound channels only move to the set position and the combustion air fan is started when this channel receives an input signal.
Requirements for starting the cooling program with combustion air fan:
Monitoring of the cooling program starts as soon as the combustion air fan is started. The alarm message (463) "cooling criteria not met" is triggered if one of the following signal states occurs within 90 seconds: