Form I-RA/D 140/235 (Version A), Page 36
Oil Burner Troubleshooting
To diagnose malfunctions properly, the following test equipment is
required:
1)
An electrical test meter that can measure AC volts, ohms, and
amps;
2)
A combustion analyzer kit to measure oxygen and/or carbon
dioxide, smoke, stack temperature, and draft; and
3)
Two pressure gauges with scales of 0-100 PSIG and 0-30 PSIG.
Before test firing any heater, check the combustion chamber for an
excessive accumulation of unburned oil and restore to safe condition
before firing. (See page 35.)
WARNING: Do not attempt to start the burner when
excess oil has accumulated, when the furnace is
full of vapor, or when the combustion chamber is
very hot.
NOTE: Refer to the troubleshooting guide on page 37 to select the
appropriate troubleshooting chart.
Check the
Indicator Lights
Light
Location (on the
Electrical Box
Function
GREEN
On the side next to the
disconnect (on/off) switch
Indicates that the main
power is on to the heater
GREEN
On the fixed-cover por
-
tion above the ignition
controller
Indicates that all limits have
been satisfied and the unit
is ready to operate
Troubleshooting
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Viewport Cover
Backflow Sensor Switch
Description/Application
- The backflow sensor is a temperature-sen
-
sitive switch that is designed to shutdown the heater when there is a
positive pressure in the combustion chamber The heater is designed
to operate with an overfire draft of -0.01” to -0.02” w.c. Prolonged
operation at a positive pressure (greater than or equal to 0.00” w.c.)
can cause overheating and accidental component failure. Undesirable
positive furnace pressure can be caused by any one or a combination
of the following conditions:
• Totally or partially blocked flue gas venting system
• Improperly designed venting system
• Improper fuel-to-air ratio for combustion
• Excessive ash buildup on interior heat exchanger surfaces
• Blocked heat exchanger passages
• Improper atomization of the fuel
• Plugged or defective fuel nozzle
• Improperly adjusted fuel nozzle assembly
Backflow
Sensor
