General Information | 4051 Igniters
Bulletin 4051 Page 5
INSTALLATION 1. Install igniter into ¾" NPT pilot/igniter fitting in burner. For easy removal, use an anti seize compound on igniter threads and finger tighten only. Over tightening with a wrench could cause the igniter to bind and seize in the burner body. 2. Connect assisting air supply to igniter assembly through either of the two 1⁄8 " NPT taps provided. Assisting air must be tapped from a 6-20 osi air source (P1). The combustion air header upstream of the main air valve is an excellent source of ignition assisting air. The igniter air supply line should be ¼" tubing. The unused tap can be used to read the air pressure in the igniter body (P2). The air pressure in the igniter body (P2) will be much lower than the air pressure at the supply source (P1). 3. A limiting orifice valve should be placed in the igniter air supply line if the igniter air supply pressure is greater than 20 osi, or if lighting a 4442-0 to -4 Tempest burner. The limiting orifice valve can be set by adjusting the air supply until the igniter body pressure (P2) is 0.2-1 osi. Small Tempest burners light best with lower air pressures at the igniter. 4. Connect the ignition cable from the transformer to the igniter. The transformer and the igniter must be grounded to insure proper spark.
OPERATION TIPS The 4051 Igniter has a very wide tolerance of air settings, but if the air flow through the igniter is set at extremes, the spark may be unacceptable for lighting the burner. If the air is turned off or is set very low, the spark will arc at a single point on the igniter body (Figure 1). If the air is set very high, the fuel/air ratio around the spark may be so "lean" that the burner will not light (Figure 2). With the ideal amount of air, multiple arcs are produced around at least 120 degrees of the electrode (Figure 3). These arcs should travel along the entire length of the exposed electrode. One setup technique is to observe the spark outside the burner and adjust the air until the optimum spark is achieved. Do not use the 4051 spark igniter with premix burners or burners that must be lit at high excess air rates. The burner excess air lighting limit is dependent on the fuel/air ratio at the ignition source. 4442 Tempest ® burners can be lit at higher excess air rates than 4422 style burners due to their higher excess air limit.
Figure 1
Figure 2
P2
4051 IGNITER
IGNITION CABLE
Figure 3
5000/6000 VOLT TRANSFORMER
IGNITER AIR SUPPLY OPTIONAL LIMITING ORIFICE VALVE
AIR FLOW RATES
I gniter Body Air Pressure
Igniter
Air Flow 33 cfh 50 cfh 77 cfh 121 cfh 172 cfh
P1
0.1 osi 0.2 osi 0.5 osi
COMBUSTION AIR VALVE
COMBUSTION AIR BLOWER
1 osi
2 osi
Figure 4
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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