Desa CGN20 - Manual (Page 14)

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VENT-FREE NATURAL GAS HEATERS
BLUE-FLAME CGN20, CGN20L AND RN30D
WARNING : If you smell gas
• Shut off gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
IMPORTANT: Operating heater where im-
purities in air exist may create odors. Clean-
ing supplies, paint, paint remover, cigarette
smoke, cements and glues, new carpet or
textiles, etc., create fumes. These fumes may
mix with combustion air and create odors.
POSSIBLE CAUSE
1. Metal expanding while heating or con-
tracting while cooling
1. Heater burning vapors from paint, sol-
vents, glues, etc. See IMPORTANT state-
ment above
2. Gas leak. See Warning statement above
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Gas leak. See Warning statement above
2. Control valve defective
1. Foreign matter between control valve
and burner
2. Gas leak. See Warning statement above
1. Not enough combustion/ventilation air.
OBSERVED PROBLEM
Heater produces a clicking/ticking noise
just after burner is lit or shut off
Heater produces unwanted odors
Heater shuts off in use (ODS operates)
Gas odor even when control knob is in OFF
position
Gas odor during combustion
Moisture/condensation noticed on windows
REMEDY
1. This is common with most heaters. If
noise is excessive, contact qualified ser-
vice person
1. Ventilate room. Stop using odor causing
products while heater is running
2. Locate and correct all leaks (see Check-
ing Gas Connections, page 9)
1. Open window and/or door for ventilation
2. Contact local natural gas company
3. Clean ODS/pilot (see Cleaning and Main-
tenance, page 11)
1. Locate and correct all leaks (see Check-
ing Gas Connections, page 9)
2. Replace control valve
1. Take apart gas tubing and remove foreign
matter
2. Locate and correct all leaks (see Check-
ing Gas Connections, page 9)
1. Refer to Air for Combustion and Ventila-
tion requirements (page 3)
TROUBLESHOOTING
Continued