Troubleshooting - Eclipse Combustion RAH Series Manual

6.0 Trouble-Shooting
Symptom
1. Burner does not
start initially.
2. Burner kicks out
shortly after start-up.
3. Pilot will not ignite on
initial light-off.
4. Flame failure when
burner goes to high fire.
5. Flame failure when main
burner returns from high
to low fire.
6. Main flame too large at
high fire.
7. Main flame not
extending beyond face
of burner at high fire.
8. Main flame long and
yellow.
Cause
a) Air pressure switches
not making.
b) Faulty pressure
switches.
a) Low gas pressure
switch set too high.
a) Raw gas fed into pilot
causing carbon hair on
spark plug.
a) Gas pressure to pilot
regulator too high.
b) Bolts which fasten pilot
casting to burner are not
tight enough.
c) Pilot regulator not react-
ing fast enough to duct
pressure changes.
d) Check valve stuck open.
e) Too much pilot gas.
a) Gas pressure to pilot
regulator.
b) Under-gassing pilot.
a) Gas pressure too high
at burner inlet.
b) Combustion air pressure
too low.
c) Check valve stuck open.
a) Air pressure
differential too high.
b) Burner not firing rated
input.
c) Burner gas holes
plugged.
a) Velocity past burner
lower than 500 FPM.
b) Check valve stuck open.
Check
a) Check pressures in
duct at location of
switch connections.
b) Check electrical
portion of switch.
a) Check low pressure
switch setting.
a) Check spark plug for
carbon hair; also check
gap on plug (should be
3/64" - 3/32".
a) Check pilot gas pressure
to regulator (should be
1 PSIG maximum).
b) Check tightness of bolts.
c) Check impulse line for
possible dirt clogging;
also check impulse line
duct connection to
determine if an effective
pressure is being trans-
mitted to regulator.
a) See Check 4a.
b) Check pilot regulator
inlet and outlet gas
pressures; also check
pilot flame.
c) See Check 4c.
a) Check gas pressures.
b) Check air pressure
differential.
a) Check air pressure
differential between
combustion air manifold
and main duct.
b) Check gas pressure
differential.
c) Check gas holes for dirt
or lint.
a) Check velocities and
rotation of main
circulating fan.
Remedy
a) Change pressure
connections where
a more positive
pressure is present.
a) Reset
a) Adjust pilot gas cock by
first screwing needle
closed, then with trans-
former powered, open
needle slowly 1/4 turn
at a time.
a) Relocate pilot gas line or
use second pilot
regulator.
b) Tighten bolts.
c) Clean impulse line of any
dirt particles and relocate
duct connection to trans-
mit maximum duct
pressure.
d) Clean check valve.
e) Reduce pilot gas flow.
a) See Remedy 4a.
b) Open needle on pilot
adjusting cock slowly
1/4 turn at a time.
c) See Remedy 4c.
a) Screw out on main gas
pressure regulator.
Adjust linkage on gas
control valve to hold
valve less than full open
when at high fire.
b) Open air shutter on
makeup air blower.
c) Clean check valve.
a) Close air shutter on
makeup air blower.
b) Screw in on main gas
pressure regulator to
provide more gas.
c) Clean gas holes with #42
MTD drill. Clean air
holes with #27 MTD
drill.
a) Open shutter on
makeup air blower.
b) Clean check valve.