- COZY/ Louisville Tin and Stove Co. Inc. INSTALLATION AND OPERATING INSTRUCTIONS Gas-Fired Vented FLOOR FURNACE 90N30A, 90N50A, 90N65A, 90N75A
TROUBLE SHOOTING CHART - AUTOMATIC PILOT & VALVE
TROUBLE SHOOTING CHART - MAIN BURNER
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Flame too large 1. Defective operator section of gas valve. 1. Replace complete valve.
2. Burner orifice too large. 2. Check with local gas company for
proper orifice size and replace.
3. If installed above 2,000 ft. 3. Refer to Burner Orifice Section, Pg. 12.
Flame pops back Too much primary air. Adjust air shutter. See Page 12.
Noisy Flame 1. Too much primary air. 1. Adjust air shutter. See Page 12.
2. Noisy pilot. 2. Reduce pilot gas with adjusting screw marked
pilot on combination gas control valve. See
Page 12.
3. Burr in orifice (if it whistles or 3. Remove burr or replace orifice. (Do not
resonates). enlarge orifices).
4. Excessive gas input. 4. See “Flame Too Large” above.
Yellow tip flame (some 1. Too little primary air. 1. Adjust air shutter. See page 12.
yellow tipping on L.P. 2. Clogged main burner ports. 2. Clean main burner ports. (Do not enlarge ports).
gas is permissible) 3. Clogged draft hood. 3. Clean draft hood.
4. Linted up air shutter. 4. Check for dust or lint at air mixer opening and
around the shutter.
Floating flame 1. Blocked venting. 1. Clean flue passage ways to remove blockage.
2. Insufficient primary air. 2. Adjust air shutter to increase primary air supply.
Gas odor 1. Chimney or vent obstruction. 1. Clean chimney or vent - replace if necessary.
2. Drafts around appliance. 2. Eliminate drafts.
3. Gas leak. 3. See Page 1.
Delayed ignition 1. Pilot flame too small. 1. Check pilot orifice, close, increase pilot gas flow if
necessary by adjusting at combination control valve.
See Page 12.
2. Burner ports clogged near pilot. 2. Clean burner ports (Do not enlarge ports).
3. Low gas pressure. 3. Check gas supply pressure.
4. Pilot decreases in size when main burners 4. Supply piping is inadequately sized. Consult local
come on. gas utility or competent installer.
5. Air shutter open too far. 5. Close air shutter to proper setting as outlined in
these instructions (slight yellow tipping is
allowable on L.P. gas).
6. Drafts around appliance. 6. Eliminate drafts.
7. Bad venting. 7. See “Venting”.
Failure to ignite 1. Main gas off. 1. Open all manual gas valves.
2. Defective gas valve. 2. Replace gas valve.
Condensation of water vapor 1. Improper venting. 1. See “Venting.
Burner won’t turn off 1. Defective or sticking automatic valve. 1. Clean or replace valve.
2. Excessive gas pressure (The supply gas 2. To correct this situation contact the utility
pressure must not exceed 1/2 psi or 14” supplying the gas.
water column).
Incorrect gas input 1. Gas input not checked. 1. Recheck gas input.
2. Clogged orifice. 2. Check orifice for clogging. If clogged, clean out the
hole carefully with a smooth wood toothpick. (Do
not in any way enlarge or distort it.
Not enough heat 1. Appliance undersized 1. This is especially true when a dwelling or room is
enlarged. Have the heat loss calculated and compare to
the appliance output (70% of input). Your gas company
or installer can supply you with this information. If
appliance is undersized, replace with correct size unit.
2. Thermostat set too low. 2. Setting of thermostat. See “Lighting and Shutting Down
Instructions”.
3. Incorrect supply pressure. 3. Check supply pressure as outlined above.
Too much heat 1. Thermostat set too high. 1. Lower setting of temp. dial. See “Lighting and Shutting
Down Instructions”.
2. Combination control valve sticks open. 2. Replace combination control valve.
Burner won’t turn on 1. Pilot flame too large or too small. 1. Readjust pilot flame using adjustment screw marked
“Pilot” on combination control valve. See Page 10.
2. Dirt in pilot orifice. 2. Clean pilot orifice with air or solvent, do not ream.
3. Defective automatic pilot section in 3. Replace entire combination control valve.
combination control valve.
4. Defective Thermocouple. 4. Replace thermocouple.
5. Defective combination control valve. 5. Replace valve.
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