Desa TC100RNG - Manual (Page 8)

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NATURAL GAS CONSTRUCTION HEATER
TC100RNG
SYMPTOM
Pilot fails to light.
Pilot lights but goes out
when control valve knob is
released.
Maximum burn rate is low;
emitter not glowing.
Soot forming inside heater,
flame 100% yellow.
Flames are extremely high.
Coming out of louvers
POSSIBLE CAUSE
1. Natural gas supply valve closed on gas supply.
2. Air in gas line.
3. Blockage in pilot orifice.
4. Piezo ignition system not sparking.
1. Not enough warm-up time.
2. Low gas pressure.
3. Thermocouple loose or needs to be replaced.
4. Control valve needs to be replaced.
1. Main burner valve not fully open.
2. Plugged gas orifices.
3. Low gas pressure.
1. Main burner valve not fully open.
2. Low gas pressure.
1. Unit was connected to LP gas instead of natu-
ral gas.
REMEDY
1. Open natural gas supply valve slowly.
2. Allow several minutes to purge air with automatic
control valve button depressed.
3. Replace pilot orifice.
4. Adjust ignitor electrode gap to .120". Check wire
lead for damage. Replace piezo ignitor and/or
ignitor electrode as necessary.
1. Relight, hold automatic control valve button in
45 seconds.
2. Check natural gas for proper gas supply.
3. Tighten connection or replace thermocouple.
4. Replace control valve.
1. Fully open main burner valve by turning the valve
handle towards ON position until it stops.
2. Replace gas orifice.
3. Consult natural gas supplier; check regulator
output.
1. Adjust main burner valve slowly towards ON
position.
2. Consult natural gas supplier.
1. Check gas source, replace with natural gas sup-
ply.
TROUBLESHOOTING
You may have further questions about this
heater. If so, contact DESA International’s
Technical Service Department at 1-800-
323-5190.
WARNING: Never service heater while it is connected to gas
supply, operating, or hot. Severe burns can occur.