Air Pressure Switch
Mounted on the burner fan, this switch is operated by the pressure of air entering the burner
through the fan. Lack of air, or insufficient pressure, will prevent the switch completing the circuit
thus preventing the burner from operating.
Gas Head Assembly
Consists of a Multi-bloc incorporating an integral governor, pressure switch and gas valves. In
addition to the internal components, an external pilot line is fitted with its own gas solenoid valves
and governor. The gas train is also fitted with a gas actuator.
Note: Boilers fitted on skid systems and in plantrooms are interlocked with the feedwater and condensate return
tank, after switching the boiler on at the boiler control box isolator switch, the reset button on the tank control box
must be reset. This reset must also be selected after any electrical outage.
Indicator lights are fitted to the control panel as an additional aid to the operator.
The meaning and operating sequence of these lights is as follows:
The power on light is derived from a single phase. It is possible that with the control phase down or a
defective bulb the other phases could be live. Always isolate the supply before investigating any fault.
Power On
Indicates that power is being supplied to the control panel box.
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