The Igniter control system has been designed to offer maximum reliability and flexibility. The Igniter uses only on low tension cable to transmit the spark and also to receive the flame on signal, giving maximum with less congestion of the equipment.The Igniter Control System provides two functions
The Igniter control system is designed to be used in conjunction with a single electrode gas-air mix Igniter rod. The Igniter Coil is mounted at the rear end of the Igniter Rod, and connections are via a 3 way plug and socket. The Igniter coil is fed from a pulsed generator which is switched by a Thyristor. This pulsed supply (140V Half Wave) is applied to the low tension winding of the coil, which in turn, generates the high tension spark.Duties:
During the Spark On period, the ionisation detector rejects any signals from the spark generated, this being taken care of by a capacitor network, thus flame present detection can only take place after the spark is switched off and a flame on signal from the electrode is detected.
The Flame On signal is achieved by ionisation. When a gas flame is established, this permits the flow of positive ions between the electrode (Anode) and the Igniter body (Cathode). This gives a variable forward resistance. The Igniter Control System has a set resistance threshold and when this is reached; the relay in the control system is energised, indicated by orange Led Flame On. This change is displayed on a 0-10V analogue signal strength meter, which is incorporated into the unit to indicate when the gas air mix is correct.Specification
The Gas is supplied to the mixer and is prevented from entering the Igniter by 2 off solenoid valves. At the same time the air is supplied via a filter and regulator mounted on the ignition plate. This air is prevented from entering the Igniter by a single solenoid valve. When a voltage is applied to the solenoids the valves are opened allowing the gas and the air flow through to the mixer. The gas and air is metered entering the mixing chamber to give the correct gas air ratio for ignition. The flame is lit by a high tension spark at the tip of the pilot.LT300s Gas/Air Pre Mix Igniter
This Igniter, of the gas-air mix design, produces a very hard stable gas flame and will light the main fuel all conditions of combustion air flow. It is possible to totally discriminate between the Igniter gas flame, and the main flame by incorporating our gas flame ionisation detection system. The igniter uses a high tension spark to ignite the primary mixture supplied from the gas/air mix valve complex. The pulse coil is directly mounted on the non firing end of the Igniter. The central ignition rod is also used to provide the ionisation signal. One stainless steel flexible hose is connected from the ignition plate to the Igniter. The Igniter is then fitted in a fixed position with the firing end behind the air stabiliser of the burner.LT300XL Gas/Air Pre Mix Igniter
This igniter comprises an internal pre-mix pilot as described above, with an additional neat gas annulus providing additional heat input for special applications where a larger ignition flame or pilot is required.