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PROBLEM SOLVING GUIDE
Burner starting difficulties and their causes:
1) The burner goes to lockout after the prepurge period because the flame does not ignite.
a) Air has not been fully evacuated from the gas lines.
b) The gas valve is passing too little gas.
c) The ignition spark is irregular or not present.
d) The gas valve is defective.
2) The burner does not start when there is a call for heat.
a) The air pressure switch has failed to return to n.c. contacts.
b) There is no gas, or insufficient pressure in the supply lines to activate the optional gas pressure switch (if used).
c) There is a blown buss fuse behind the terminal strip.
d) The burner has gone off on safety.
e) The low voltage contacts or the low voltage relay are defective.
3) The burner does not go through prepurge, ignition is established, the burner fires for 2 seconds, then goes to lockout.
a) The air pressure switch does not change from normally closed to normally open contacts. This condition ex-
ists due to insufficient pressure in the air tube. Moving the firing head towards zero (0) on the stop gate will
rectify this problem.
4) The burner goes through prepurge, ignition is established, the burner fires for 2 seconds, then goes to lockout.
a) The flame rectification rod (flame rod) has shorted to ground or is defective.
b) Polarity is reversed or the earth ground is not properly connected.
c) The ionization current is weak (lower than 5 micro-amps).
OWNER INFORMATION AND ROUTINE MAINTENANCE
SAFETY LOCKOUT
This burner is equipped with multiple interlocking safety devices. In the event of a failure in the flame, or any blockage
of the combustion air supply, the burner will "lock out" in a safety condition. In such an event, an illuminated red button
will show on the front of the red cover.
To restart the burner, press the button once only. Should the burner return to the lock out condition, call a qualified
service technician or your gas company for assistance. In the case of loss of pressure in the gas supply line, the burner
will go off on safety. If supplied with an optional gas pressure switch (or field installed), the burner will simply switch off
on low gas pressure, and start up again when the gas pressure returns to normal.
NOTE: Keep the area around the burner free and clear of all combustible materials, gasoline and other flammable
vapours and liquids. Do not allow any obstructions, which may prevent the free, flow of air to the burner.
MAINTENANCE
Like all precision equipment, your burner will require periodic maintenance. At an interval of 2 months, you should:
1) If your boiler/furnace has an observation port, visually check the flame.
2) Check and clean the air intake louver to remove any buildup of fluff, dust, pet hair, etc.
For any maintenance or repairs over and above those listed, contact your service technician or gas company.
THERE ARE NO OWNER SERVICEABLE PARTS INSIDE THE BURNER COVER.
Once a year, you should have the burner checked as indicated below, by your local authorized Riello dealer.
1) Check burner distributor head and mixing plates. Clean if necessary.
2) Check ignition electrode. Clean, adjust, or replace as necessary.
3) Check the flame sensor rod (ionization rod) for dirt or carbon build up. Clean, adjust, or replace as necessary.
4) Check manifold gas pressure.
5) Check all burner adjustments.
6) Generally clean all exposed parts and components.
7) Repeat combustion tests.
Your Riello 40 gas burner is only part of your heating system.
Once every year you should have your heating appliance serviced by a qualified service technician.
You should also have the chimney checked, and cleaned if necessary.
20027974
GB
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