4027 Pilot Tips 4027 premix pilot tips are intended as replacements for legacy pilot tips with ½ " NPT inlets. They can be lit at higher mixture pressures and operated over wider limits of pressure and air/fuel ratio than the former 4024-01 and 4025-01 tips. The fuel can be natural gas, propane or other clean gases (800 Btu/ft3 or more). 4027 pilot tips are used in 4018 high pressure pilot systems and are recommended as the spare tip for these assemblies. See the 4018 bulletin for details. All 4027 pilot tips have the same inlet body and capacity, they differ only in the burner connection style and ignition method. The 4027- 01-25, 4027-01-T2425, and 4027-01-24 include a R240-2465 spark plug for ignition. To light a manual ignition 4027 pilot, let a torch
Sheet 4027
flame enter the lighting hole until the pilot lights. Manual ignition 4027 pilots cannot be easily modified to accept a spark plug.
Cross-connected ratio regulators are recommended, as they improve pilot system reliability. The 4011/4021 Bulletin has instructions for installing and operating small pilot systems. Most legacy 4024, 4025 and 4027 pilot tips use 4035 pilot mixers with ½ " NPT outlets. These mixers have been obsolete for many decades (since the 1970's). If an old 4035 mixer or its pilot tip need replacement, consider replacing the pilot system with a 4011 pilot set, which includes a 4031 mixer, 4021 pilot tip, 1122-0 air valve and 1821B-02 gas valve.
4027 CROSS REFERENCE
Max. mixture p. "w.c. (mbar)
Pilot Tip
Replaces
Description
For
Stability
Designation
Old Pilot Tip
Burner Connection/Ignition ¾ " NPT Threaded/Manual
Lighting after Lighting
4027-01-MT2425
4024MT-01, 4025MT-01, 4027MT-01
4027-01-M25 4027-01-M24
4025M-01 4024M-01
1 1⁄8 " Ø Slip-fit/Manual 1" Ø Slip-fit/Manual
3 (7.5)
11 (27)
4027-01-T2425
4024T-01, 4025T-01, 4027T-01
¾ " NPT Threaded/Spark
4027-01-25 4027-01-24
4025-01 4024-01
1 1⁄8 " Ø Slip-fit/Spark 1" Ø Slip-fit/Spark
15 (37)
36 (89)
OPERATING CHARACTERISTICS
Approximate Pilot Premix Flow Rates
Mixture Pressure
Air Flow
Gas Flow
Flame Length inches (mm)
"w.c. (mbar)
scfh (Nm 3 /h)
scfh (Nm 3 /h)
2.9 (7.2) 5.8 (14.4) 11.6 (28.9)
277 (7.7) 320 (8.9) 455 (12.6)
27 (0.75) 31 (0.86) 44 (1.22)
5.5 (140)
7 (178)
7.5 (191)
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.
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