COZY 90NXXA Manual De Instrucciones página 20

TROUBLESHOOTING YOUR FURNACE
MAIN BURNER - for qualified service technicians
ISSUE
Flame Too Large
Flame Pops Back
Noisy Flame
Yellow Tip Flame
(Some yellow
tipping on propane
gas is permissible)
Floating Flame
Gas Odor
Delayed Ignition
Failure to Ignite
Condensation of Water Vapor
Burner Won't Tum Off
20
GAS FIRED VENTED
FLOOR FURNACES
POSSIBLE CAUSE(S)
1. Defective operator section of valve.
2. Burner orifice too large.
3. If installed above 2,000 ft.
1. Too much primary air.
1. Too much primary air.
2. Noisy pilot.
3. Bun in orifice
(if it whistles or resonates).
4. Excessive gas input.
1. Too little primary air.
2. Clogged main burner ports.
3. Clogged draft hood.
4. Linted up air shutter.
1. Blocked venting.
2. Insufficient primary air.
1. Chimney or vent obstruction.
2. Drafts around appliance.
3. Gas leak.
1. Pilot flame too small.
2. Burner ports clogged near pilot.
3. Low gas pressure.
4. Pilot decreases in size
when main burners come on.
5. Air shutter open too far.
6. Drafts around appliance.
7. Bad venting.
1. Main gas off.
2. Defective gas valve.
1. Improper venting.
1. Defective or sticking automatic
valve.
2. Excessive gas pressure
(The supply gas pressure must not
exceed 1/2 psi or 14" water column).
CORRECTIVE ACTION
1. Replace complete valve.
2. Check with local gas company for proper orifice size
and replace.
3. See burner orifice section, Page 15
1. Adjust air shutter. Page 15
1. Adjust air shutter. Page 15
2. Reduce pilot gas with adjusting screw marked pilot on
combination gas control valve. Page 15
3. Remove bun or replace orifice. (Do not enlarge orifices).
4. See "Flame Too Large" section above.
1. Adjust air shutter. Page 15
2. Clean main burner ports. (Do not enlarge ports).
3. Clean draft hood.
4. Check for dust or lint at air mixer opening and around
the shutter.
1. Clean flue passage ways to remove blockage.
2. Adjust air shutter to increase primary air supply.
1. Clean chimney or vent - replace if necessary.
2. Eliminate drafts.
3. Page 1
1. Check pilot orifice, close, increase pilot gas flow if
necessary by adjusting at combination control valve.
Page 15
2. Clean burner ports (Do not enlarge pmts).
3. Check gas supply pressure.
4. Supply piping is inadequately sized. Consult local gas
utility or competent installer.
5. Close air shutter to proper setting as outlined in these
instructions (slight yellow tipping is allowable on propane gas).
6. Eliminate drafts.
7. See "Venting".
1. Open all manual gas valves.
2. Replace gas valve.
1. See "Venting."
1. Clean or replace valve.
2. To connect this situation contact the utility supplying the gas.