Kees IFG (INDIRECT FIRED GAS) MAKE-UP AIR UNITS - Duct Furnace Installation & Maintenance Manual - Manual (Page 23)

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Chart 6 - Trouble Shooting continued
SYMPTOMS
E. Flame lifting from burner ports.
F. Flame pops back.
G. Noisy flame.
H. Yellow tip flame (some yellow
tipping on propane gas is per-
missible.
POSSIBLE CAUSES
8. Defective transformer.
9. Loose wiring.
10. Defective ignition control.
1. Pressure regulator set too
high.
2. Defective regulator.
3. Burner orifice too large.
1. Excessive primary air.
1. Too much primary air.
2. Noisy pilot.
3. Irregular orifice causing whistle
or resonance.
4. Excessive gas input.
a. Pressure regulator set too
high.
b. Defective regulator.
c. Burner orifice too large.
1. Insufficient primary air.
2. Clogged main burner ports.
3. Misaligned orifices.
4. Air shutter linted.
5. Insufficient combustion air.
6. Clogged draft hood/flue collec-
tor.
CORRECTIVE ACTION
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 sup-
plier 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 collecter.