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PV500-17 05-2000 Section 17
12
MAXIM
TROUBLESHOOTING SUGGESTIONS
AXIAL FLOW GAS BURNER (continued)
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 CO
2
/O
2
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.
C. Gas line obstructed. 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.