Pilot Accessories | Gas Pilots
AIR/FUEL RATIO CONTROL FOR 4015 PILOT SETS
Cross connecting to the mixture pressure generally provides better ratio control resolution than using the air pressure tap. Use the air pressure tap to impulse the regulator in cases where having an air / fuel premix in the impulse line and regulator case is objectionable. For example when the fuel contains corrosive components.
There are a number of reasons to use a cross connect ratio regulator with a 4015 pilot set. The combustion chamber pressure varies or is different than the room pressure, so pilot tips are almost always cross connected. The regulator can be cross-connect to the mixture pressure tap or air pressure tap with an impulse line (ideally 3/8" Copper or SST tubing). When a ratio regulator is cross-connected, the gas pressure at the regulator inlet must be at least equal to the impulse line pressure plus pressure drop across the governor. Do not set the gas pressure upstream of the ratio regulator higher than necessary. When the gas pressure is increased above optimum the the air/fuel ratio adjustment will lose resolution and get touchy.
See the 3065 and 4011/4021 bulletins for additional guides for using ratio regulators with pilots and burners.
Recommended regulators to use with 4015 pilot tips
Regulator (Purchase Separately)
Air Flow*
Natural Gas Flow^
Pilot Set
Part Number
scfh 520 820 1230 1500 1800 2500 820 1230
Nm3/h
scfh
Nm3/h
Cross-Connected 7218-01 or 7350-01 7218-01 or 7350-01 7218-01 or 7350-01 7218-01 or 7350-01
Zero Governor
4015-0T 4015-1-T
14.7 23.2 34.8 42.5 51.0 70.8 23.2 34.8
52 82
1.47 2.32 3.48 4.25 5.10 7.08 2.32 3.48
7218-01 or 7350-01
7218-0 7218-1 7218-1 7218-1 7218-1 7218-0 7218-1
4015-2-T 4015-3-AT 4015-3-BT 4015-3-CT
123 150 180 250
7218-0 7218-0
4015-1 4015-2
82
7218-01 or 7350-01 7218-01 or 7350-01 7218-01 or 7350-01 7218-01 or 7350-01 7218-01 or 7350-01 7218-01 or 7350-01
123
4015-0-MT 4015-2-MT 4015-1-M 4015-2-M
520
14.7
52
1.47
7218-01-or 7350-01
1230 820 1230
34.8 23.2 34.8
123
3.48 2.32 3.48
7218-1 7218-0 7218-1
82
123
* Air flow at 8 osi (13.8"w.c.) (34.5 mbar) air pressure into mixer and with 3.5"w.c. (8.7mbar) mixture pressure into pilot tip. ^ Gas flow at stoichiometric ratio (approximately 10:1 air/fuel ratio with natural gas). Note: The air and gas flows shown in this table can be adjusted for optimum operation per the installation and lighting instructions.
OTHER PILOT BULLETINS AND ACCESSORIES see product details on bulletins or sheets listed below:
NORTH AMERICAN PILOT ACCESSORIES:
OTHER NORTH AMERICAN PILOTS:
1400 (1486A-02B) Solenoid Valves, Specs, Dimensions 1821B Shutoff Valves 1122 Manual Butterfly Valves for Gas and Air 3065 Mixer 4031 Pilot Mixer 4065 Ignition Transformers 4085 Ignition Cable 8790 Observation Ports
4011 4011 Pilot Sets/4021 Pilot Tips ( ¾ " Outlet and Inlet) 4014 Gas Boosted Pilot Assemblies 4018 High Pressure Gas Pilot Specifications 4020 Nozzle-Mix Gas Pilots for Industrial Burners 4027 Pilot Tips ( ¾ " Outlet and ½ " Inlet)
Bulletin 4015/4025 Page 7
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