Supply an AC240V voltage to the ignition exciter. This input voltage is converted to an D.C pulse voltage by step-up transformer and rectifier and charges an energy-storing capacitor. When the voltage across the capacitor reaches the breakdown level of the discharging tube, the capacitor discharges and the discharging current flows through discharging tube, choke coil, connecting cable and spark rod to produce high energy sparks at the spark rod firing gap. When the exciter stops, residual electricity is discharged through the discharge resistor. (See Drawing 1)

3. Specifications

3.1.Main data

Items		XDH- 20C
Exciter	Stored Energy, J	20
	Input Voltage, V	AC220
	Output Voltage, VDC	2500±5℅
	Spark Rate, (S/S)	2～15 Adjustable
	Duty Cycle (on/off), S	120/60
Spark Rod	Initial Spark Voltage, VDC	600～1400
	Central Circuit Resistance, Ω	≤0.05
	Heat-resistance at firing end ℃	long term≤800 1250℃ within 5min
Cable	Central Circuit Resistance, Ω	≤0.1
	Breakdown Voltage, VAC	≥5000 (50HZ)
	Insulating Resistance , MΩ	≥500
Ambient Temp.		－30℃～70℃
Relative Humidity		≤90％ RH

3.2. Main performance

The exciter could be divided into 4 specifications and 7 models. They are XDH-2、XDH-2Z、XDH-10B、XDH-20、XDH-20T、XDH-20F、XDH-50.

The user should correctly select the energy storage level of the ignition device according to the type of fuel as shown in the table below. Follows is the types:

Energy storage grade	1J	2J	6J	20J	50J
Exciter	XDH－1G	XDH-2Z	XDH-6B	XDH-20C、T、F	XDH-50
Fuel Type	Fuel gas	Fuel gas	Fuel gas	Light oil &Crude oil	Crude oil& Residual oil

4. Outline and mounting dimensions ( See Drawing 4 as attached)

5. Mounting and Regulation

5.1. EA exciter shall be used with proper connecting cable and spark rod. Connect the spark rod to the HEA exciter, using the high-voltage connecting cable. The two threaded connectors of the connecting cable shall be properly connected to their counterparts on the exciter and spark rod. Tighten the connector lock nut so that the central electrodes contact well, otherwise strike arc might occur resulting in internal damage of the unit. (See Drawing 2)

5.2. The firing end of the spark rod should be located where the fuel is dense. Judging from experience, the dimension L between 100mm 〜150mm is normally adjusted, depending on oil gun spray angle and diffuser cone flow recycling. (See Drawing 3)

5.3. After mounting, supply the exciter with power.

Notice: Do not touch electric parts when igniting.

6. Usage and Operation

6.1. Do not energize the exciter if the spark rod is not connected to the exciter.

6.2. Connect the exciter correctly and insert firing end into fuel tank for 100 ～150mm.

6.3. In high charge, do follow the working period prescribed.

6.4. Do cut off power if it is off for long time.

6.5. To service the exciter, disconnect power supply and wait for at least 5 minutes before service operation.

7. Troubles and Troubleshooting

Troubles	Cause	Troubleshooting
Strike arc occurs at the exciter-cable connector	Poor contact between exciter and connecting cable	Reconnect
Strike arc occurs at the spark rod-cable connector	Poor contact between exciter and connecting cable	Reconnect
The HEA Ignition unit does	1.System power not supplied to the unit	Check the power supply
	2. Poor contact among exciter, spark rod and connecting cable	Reconnect
	3. Connecting cable broken or short-circuit	Replace the cable
	4 . Spark rod damaged	Replace the rod
	5. HEA exciter damaged	Repair or replace the exciter

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