Elster Eclipse AirHeat AH, Руководство по эксплуатации

Страница: 12 / 14

12 AirHeat, V1, Operating Instructions, Edition 09.12
Troubleshooting
Symptom Cause Check Remedy
Burner does not start
initially.
• Air pressure switches not
making.
• Faulty pressure switches.
• Check pressures in duct at
location of switch connections.
• Check electrical portion of
switch.
• Change pressure
connections where a more
positive pressure is present.
Burner kicks out
shortly after start-up. • Low gas pressure switch
set too high.
• Check low pressure switch
setting.
• Reset
Pilot will not ignite on
initial light-off. • Raw gas fed into pilot
causing carbon hair on
spark plug.
• Check spark plug for carbon
hair; also check gap on plug.
This gap should be 3/64” (1.3
mm) - 3/32” (2.3 mm).
• Adjust pilot gas cock. Screw
needle closed. With
transformer powered, open
needle slowly, 1/4 turn at a
time.
Flame failure when
burner goes too high
fire. • Gas pressure to pilot
regulator too high.
• Pilot casting bolts are not
tight enough.
• Pilot regulator not reacting
fast enough to duct
pressure changes.
• Make sure the check valve
operates freely.
• Too much pilot gas.
• Check pilot gas pressure to
regulator (should be 1 PSIG, 70
mbar, maximum).
• Check tightness of bolts.
• Check impulse line for
possible dirt clogging. Check
impulse line duct connection
for effective pressure being
transmitted to regulator.
• Relocate pilot gas line or use
second pilot regulator.
• Tighten bolts.
• Clean impulse line of any dirt
particles and relocate duct
connection to transmit
maximum duct pressure.
• Clean check valve.
• Reduce pilot gas flow.
Flame failure when
main burner returns
from high to low fire. • Gas pressure to pilot
regulator.
• Under-gassing pilot
• Check pilot gas pressure to
regulator (should be 1 PSIG, 70
mbar, maximum).
• Check pilot regulator inlet and
outlet gas pressures. Check
pilot flame.
• Check impulse line for
possible dirt clogging. Check
impulse line duct connection
for effective pressure being
transmitted to regulator.
• Relocate pilot gas line or use
second pilot regulator.
• Open needle on pilot
adjusting cock slowly 1/4
turn at a time.
• Clean impulse line of any dirt
particles and relocate duct
connection to transmit
maximum duct pressure.
Main flame too large at
high fire • Gas pressure too high at
burner inlet.
• Combustion air pressure
too low.
• Check valve stuck open
• Check gas pressures.
• Check air pressure differential. • Screw out on main gas
pressure regulator. Adjust
linkage on gas control valve
to hold valve less than fully
open when at high fire.
• Open air shutter on makeup
air blower.
• Clean check valve
Main flame not
extending beyond face
of burner at high fire. • Air pressure differential too
high.
• Burner not firing rated
input.
• Burner gas holes plugged.
• Check air pressure differential
between combustion air
manifold and main duct.
• Check gas pressure
differential.
• Check gas holes for dirt or lint.
• Close air shutter on makeup
air blower.
• Screw in on main gas
pressure regulator to provide
more gas.
• Clean gas holes with #42
MTD (2.3 mm) drill. Clean air
holes with #27 MTD (3.6
mm) drill.
Main flame long and
yellow • Velocity past burner lower
than 500 FPM (2.5m/s).
• Check valve stuck open.
• Check velocities and rotation
of main circulating fan.
• Open shutter on makeup air
blower.
• Clean check valve.