Instruction 6422 Page 2
LIGHTING AND ADJUSTMENT
c) Slowly open main air valve to high fire position, adjusting limit- ing orifice valve as necessary. d) Return control valve to low fire position. Adjust air/gas ratio regulator for desired flame. e) Repeat Steps (c) and (d) if necessary. Replace cover on limiting orifice valve. f) For multiple burner zones, approximate limiting orifice valve set- tings can be made by counting the number of turns open on the first valve. 3B. Oil Firing: a) Set atomizing air at 14-16 osi for light oil (see Bulletin 6514 for heavy oils). b) Open oil shutoff valve. Purge air from line by breaking oil line at Sensitrol ™ or running oil out of the bottom of the Ratiotrol ™ , col- lecting oil in a bucket or other container until flow is free of air. c) Adjust oil supply for 30 psi at Ratiotrol inlet. d) Open Sensitrol valve until burner lights. e) Slowly open main air valve to high fire position. Adjust Sensitrol valve as necessary. f) Return control valve to low fire position. Adjust the air/oil Ratio- trol for desired flame. g) Repeat Steps (e) and (f) if necessary. Set Sensitrol detent at high fire setpoint. h) When shutting down, turn off oil valve upstream of Ratiotrol. Al- low to purge, then shut the Sensitrol valve. If oil in the line will expand from furnace heat, expansion cham- bers (Bul. 7052) should be used to prevent Ratiotrol damage.
1. Basic: a) All manual and automatic fuel valves (gas and oil) must be closed. b) Open all furnace doors and flue dampers. Lock all burner air valves in full open position. c) Start combustion air blower and check rotation. d) Adjust control motor/air valve linkage(s) for low and high fire. e) Set atomizing air pressure at 14-16 osi. NOTE: Atom-izing air can be set at 4 osi for gas firing, but must be returned to 14-16 osi for oil firing. f) Set control motor(s) at high fire allowing furnace to purge for several minutes prior to lighting. Check motor amps with all burners at high fire. If in overload, adjust the linkage to reduce the high fire air flow. g) Return the control motor to low fire. Linkage must not bind. 2. Light the pilots in accordance with the pilot instruction sheet.
Zone Control Air Valve with Air Motor
Impulse Lines
Bleeder
Combustion Air
Atomizing Air Valve
Atomizing Air
Burner Tile
Mounting Plate Observation Port
4. Maintenance:
Pilot Tip and Mixer
a) Shut all air and fuel valves. b) Disconnect oil and atomizing air lines. c) Remove and clean atomizer. Clean burner body and gas tube. 5. Troubleshooting: A. Gas Operation a) Gas supply pressure too high or too low (see appropriate regulator literature). b) Impulse pressure too low to ratio regulator--check for dirt in line or connections; check method of connecting impulse line to air pipe (see regulator literature). c) Regulator not controlling--check method of connecting impulse line to air pipe; check regulator diaphragms (see regulator literature); if bleeder is used, check orifices for dirt. B. Oil Operation a) If fire is "sloppy," check atomizing air pressure: at least 14 osi for light oil; at least 22 osi for heavy oil. b) If fire "spits" or tends to be unstable, check for air in oil line (a suction line leak, usually at the pump) or water or dirt in the oil lines (check filters, oil tank, atomizer, etc.)
Clean-Out Plug
Ratiotrol ™ (Air/Oil)
Limiting Orifice Gas Valve
Pilot Regulator
Sensitrol ™ Oil Valve
Zone Oil Shutoff Valve
Pilot Shutoff Valve
Gas/Air Ratio Regulator
Zone Gas Shutoff Valve
Oil
Gas
3A. Gas Firing: a) Open limiting orifice valve five turns (ccw) from full closed posi- tion. b) Open gas shutoff valve(s). If burner dœs not light within a few seconds, close gas shutoff valve and open limiting orifice valve one more turn; then open gas shutoff valve. Repeat as neces- sary until burner lights. Figure 2. Piping arrangement for gas pressure less than air pressure (bleeder required).
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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