Sheet 4014 Page 4
PIPING SCHEMATIC
boost gas valve typical -1, -2, 3-A
air
D
air valve (recommended accessory)
boost gas valve boost gas limiting orifice valve B
A
pilot flame premix only
E
C
mixer gas cartridge with mixer gas adjustment screw
with boost gas added
typical -3B, -4
impulse line
boost gas
gas
flame detector
gas valve (recommended accessory)
pilot regulator (recommended accessory)
LIGHTING INSTRUCTIONS
1. Before lighting any pilot, make sure the furnace has been adequately purged. This usually requires operating the main air blower long enough to make at least 4 air changes before ignition. Example: A 4' x 5' x 10' furnace (200 cu ft volume) has a blower rated 460 cfm. It should be run (all air valves between blower and furnace wide open) for at least (4 x 200 divided by 460) = 1.74 minutes air purge time. 2. MAKE INITIAL SETTINGS - A. Close boost gas valve “B/D”. - B. Set the recommended air pressure at mixer air inlet to 6 osi (10.4” wc) with air valve “C” - C. Remove the cap on the built-in mixer gas limiting orifice valve "E". Starting from a fully closed position, open the pilot mixer gas adjusting screw about 4 turns (counterclock- wise). 3. LIGHT THE PILOT FOR THE FIRST TIME - A. Energize both the ignition spark transformer and the pilot gas solenoid valve. - B. If the pilot dœs not light, turn the gas adjusting screw "E" in or out as required, until ignition occurs. 4. FINE-TUNE THE PILOT FOR BEST FLAME STABILITY as follows: - A. First, turn the mixer gas adjusting screw "E" clockwise until the pilot flame goes out. This is the “lean limit.” - B. Next, counting the number of turns from the lean limit, turn the gas adjusting screw "E" counterclockwise, lighting the pilot, and continuing until the rich limit is reached, ragged flame appearance and loss of the sharp inner cone. - C. Then, having counted the number of turns from lean to rich limit set the gas adjusting screw "E" at mid-point between the limits. This will result in a condition near correct air/fuel ratio.
5. CHECK / SET PILOT RATIO REGULATOR SPRING SETTING. - A. Turn the pilot air pressure down to 1.0 osi (2”w.c.). - B. If the flame appears to go off ratio, remove the pilot regulator adjusting cap and adjust the pilot gas regulator spring until the flame looks correct. Turning the regulator spring adjusting screw clockwise i ncreases the gas flow; counterclockwise decreases gas flow. Replace the cap. - C. Turn the pilot air pressure back up to its original 6 osi (10.4” w.c.) setting. - D. If the regulator spring needed adjustment, recheck the gas limiting orifice setting "E" on the mixer. Once this set- ting is correct, put the cap back on the built-in mixer gas limiting orifice valve. The premix setting on the mixer should not need to be adjusted again.
Note: At this time the Flame detector signal may still be weak/ inadequate, setting the boost gas will improve the flame signal.
6. TURN ON BOOST GAS AND MAKE FINAL BOOST GAS SETTINGS. - A. On 4014-1-T through -3-AT assemblies, remove cap from handle of gas valve "D". Close the internal port adjustment completely. Open boost gas valve. Open internal port adjustment to add boost gas to pilot flame until flame de- tector gives a strong signal. Pilot flame should be about twice its original length. Replace cap on gas valve. - B. On 4014-3-BT and -4-T assemblies, remove cap of boost gas limiting orifice valve "A". Close the internal port adjust- ment completely. Open gas valve "B" and open internal port adjustment on gas limiting orifice valve "A" to add boost gas to pilot flame until flame detector gives a strong signal. Pilot flame should be about twice its original length. Replace cap on boost gas limiting orifice valve "A".
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