Set Components | 4011/4021 Pilot
4011 SET COMPONENTS 4021 PILOT TIPS Dimensions inch (mm)
4011 PILOT SETS
4011 pilot sets with 4021 pilots are used to light burners with a ¾ " NPT pilot connection or with small slip-fit ports. They can also be used for spot heating. The fuel can be natural gas, propane or other clean gases (800 Btu/ft3 or more). Each 4011 pilot set includes a 4021 pilot tip, 4031 pilot mixer, 1122-0 air valve, and 1821B-02 gas valve. Mixers have inlet and outlet pressure taps, either of which can be used to cross-connect a ratio regulator (purchased separately). This is desirable in some installations where pressure variations could upset its air/fuel ratio. For information on pilot accessories, see the accessories sections in this bulletin. 4021 PILOT TIPS 4021 pilot tips are available separately using the 4021-# part number shown in the table below. Each has a 10mm threaded connection and includes an ignition plug. Direction arrows on the tip body show the proper premix flow direction.
Spark Ignited weight = .35 lbs. (.16 Kg)
R240-2465 Igniter/Spark Plug
1.41 (36)
2.88 (73)
A OD
.56 (14)
2.50 (64)
2.50 (64)
Slip-Fit 4021-14: "A" = 1 4021-16: "A" = 1 1⁄8 "
Threaded Both Ends 4021-12
Manually Ignited weight = .30 lbs. (.14 Kg)
4021 pilot tip parts list Table 2
4-7039-1 Lighter hole Plug with (#18 drill)
No step-down on -15 and -16
Part # 4021-11 4021-12 4021-13 4021-14 4021-15 4021-16
Pilot tip body
Ignition plug
4-7039-1
4-7036-1
R240-2465
4-7039-1
A OD
4-7036-2
R240-2465
¾ NPT
¾ NPT
4-7039-1
Slip-Fit 4021-13: "A" = 1 4021-15: "A" = 1 1⁄8 "
Threaded Both Ends 4021-11
4-7036-3
R240-2465
Ignition plugs are included with 4011-# and 4021-# part numbers. They are not included if ordered using the 4-7036-# part numbers.
4021 IGNITION PLUGS
2.19 (56)
R240-2465 Igniter/Spark Plug The R240-2465 spark plug has a 10mm thread, ¼ " Ø terminal and 5⁄8 " hex. It is included with 4011/4021-12, -14, -16 pilots sets and pilots. It ships with a 0.034 Inch gap, but in some cases a slightly larger gap (0.05) is more reliable. The maximum gap is about 0.090" (electrode at 45° angle). Energize with a 4065 6000- volt transformer, using a 4085 ignition cable (both pur- chased separately) 4-7039-1 Lighter Hole Plug The 4-7039-1 plug threads partway into the 10 mm ignition port for manual 4021-11, -13, -15 pilots. To light a 4021 with a torch, light the pilot by letting a torch flame enter the open light- ing hole until the pilot lights. The hole in the 4-7039-1 plug is large enough for torch lighting but small enough to prevent too much extra air from entering the pilot which could destabilize the fl ame.
Spark ignited and manual lit 4021 tips can be converted to each other installing the appropriate ignition plug.
Bulletin 4011/4021 Page 3
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