Trane GRAA Installation, Operation And Maintenance Manual page 43

Main burners will not light
Flame lifting from burner ports
Flame pops back
Noisy flame
Yellow tip flame (some yellow
tipping on propane gas is
permissible
MUA-SVX004B-EN
Symptoms
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Defective ignition control.
1.
2.
3.
Excessive primary air.
1.
2.
3.
4.
1.
2.
3.
4.
5.
6.
Possible Causes
Main gas off.
Lack of power at unit.
Thermostat not calling for heat.
Defective limit switch.
Improper thermostat or
transformer wiring at gas valve.
Defective gas valve.
Defective thermostat.
Defective transformer.
Loose wiring.
Pressure regulator set too high.
Defective regulator.
Burner orifice too large.
Too much primary air.
Noisy pilot.
Irregular orifice causing whistle
or resonance.
Excessive gas input.
a. Pressure regulator set too
high.
b. Defective regulator.
c. Burner orifice too large.
Insufficient primary air.
Clogged main burner ports.
Misaligned orifices.
Air shutter linted.
Insufficient combustion air.
Clogged draft hood/flue
collector.
T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
Corrective Actions
1. Open all manual gas valves.
2. Replace fuse or turn on power
Replace fuse or turn on power
3. Turn up thermostat.
4. Check limit switch with
continuity tester. If open,
replace limit switch.
5. Check wiring per diagrams.
6. Replace gas valve.
7. Check thermostat and replace if
defective.
8. Be sure 115 volts is supplied to
the transformer primary then
check for 24 volts at secondary
terminal before replacing.
9. Check and tighten all wiring
connections.
10. Replace.
1. Reset manifold pressure. Refer
to operation.
2. Replace regulator section of
combination gas valve or
complete valve.
3. Check with local gas supplier for
proper orifice size and replace.
Refer to operation.
1. Close air shutter. Refer to
Operation.
2. Check with local gas supplier for
proper orifice size and replace.
1. Close air shutter. Open all
manual gas valves.
2. Reduce pilot gas. Refer to
operation.
3. Replace orifice.
4.
a. Reset manifold pressure
Refer to operation.
b. Replace regulator section of
combination gas valve or
complete valve.
c. Check with local gas
supplier for proper orifice
size and replace. Refer to
operation.
1. Open air shutters. Refer to
operation.
2. Clean main burner ports.
3. Replace manifold assembly.
4. Check for dust or lint at air
mixer opening and around the
air shutter.
5. Clean combustion air inlet
openings in bottom panel. Refer
to installation.
6. Clean draft hood/flue collector.
43