MAXIM
TROUBLESHOOTING SUGGESTIONS
AXIAL FLOW GAS BURNER (continued)
C.Gas line obstructed. Check and correct.
C.Defective automatic main or auxiliary gas shut off valves. Check electrical circuitry to valves. Replace valves or correct circuitry as required.
D.Main diaphragm shut off valve opening too slowly. Adjust bleed on valve.
E.Defective flame safeguard control or plug on amplifier. Check and replace as required.
F.Main gas pressure regulator atmospheric vent line obstructed. Correct.
G.Defective main gas pressure regulator. Replace. Misadjusted main gas pressure regulator. Readjust to meet required operational values.
H.Polarity reversed on incoming power. (S89 control only)
5.CARBON MONOXIDE READINGS ON GAS FIRING
A.Flame impingement on "cold" heat transfer surfaces caused by excessive firing rate. Reduce firing rate to correct input volume.
B.Incorrect gas/air ratios. Readjust burner to
correct CO2/O2 levels, eliminated all CO formation.
6.GAS HIGH FIRE INPUT CANNOT BE ACHIEVED
A.Gas company pressure regulator or meter operating incorrectly, not allowing required gas pressure at burner train inlet. Contact gas company to correct.
B.Gas cock upstream of train inlet not fully open. Check and correct.
D.Gas train main and/or lead test cocks not fully open. Check and correct.
E.Gas supply line between gas company regulator and burner inlet too small. Check supply pressure at meter, determine pressure drop and increase line size as required, or raise supply pressure to compensate for small line. Do not raise pressure so high that under static (no flow) conditions the pressure exceeds the maximum allowable pressure to the gas train components on the burner.
F.Burner gas train components sized too small for supply pressure. Increase component size as appropriate or consult factory.
G.Automatic gas valve not opening fully due to defective operation. Replace gas valve.
H.Orifice (if supplied) too small. Replace with correct size.
I.Defective main gas pressure regulator. Replace.
J.Incorrect spring in main gas pressure regulator. Replace as required.
K.Main gas pressure regulator vent line obstructed. Check and correct.
L.Normally open vent valve (if supplied) not closing when automatic gas valves open. Check to see if valve is fully closed when automatic valves are open. Replace vent valve, if not closing fully.
Additional troubleshooting information can be found in the Flame Safeguard bulletin supplied with the burner.
12 | Section 17 |