Eclipse Combustion TAH, CAH, DAH manual Trouble-Shooting, Symptom Cause Check Remedy

6.0Trouble-Shooting

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

Info 140 11/4/03