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POWERVT@WATER HEATER
TROUBL.ESHOOTING SUGGESTIONS
GAS BURNER
(con't)
4. BURNER MOTOR RUNS AND PILOT LIGHTS,
BUT MAIN GAS FLAME IS NOT ESTABU'3HED:
a}
Main shutoff or test cock closed. Check to
make certain fully open.
b) Pilot flame signal reading too low to pull in
flame safeguard relay. Readjust as required.
c)
Defective automatic main or auxilia:y gas
shutoff valves. Check electrical circuitry to
valves. Replace valves or correct circuitry
as
required.
d) Main diaphragm shutoff 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 atmosphe;';c 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
(589
control only). Correct.
5. CARBON
MONOXIDE
READINGS
ON
GAS
FIRING:
a) Flame Impingement on "cold" heat til'ansfer
surfaces caused by excessive firing rate.
Reduce firing rate to correct input volume.
b) Incorrect gas/air ratios. Readjust bUrrier to
correct CO
2
I O
2
levels, eliminates <iii CO
formation.
c) Excessive
flue
gas
recirculation,
causing
insufficient excess air for complete comC,ustion.
Reduce the FGR orifice size and readjust the gas
regulators to achieve proper excess air in
combustion.
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 too small (if supplied). 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.
I)
Normally open vent valve (if supplied) not
closing When automatic gas valves open.
Replace vent valve, if not closing fUlly.
Additional troubleshooting information can be found in the Flame Safeguard bulletin supplied with the burner.
PV500-19 04-2005
20
Section 19
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