Crown Boiler CLBR68-112 - Manual (Page 27)

27
SERVICE
Troubleshooting
c WARNING: When testing electrical equipment, always follow standard
electrical safety procedures.
Before beginning these troubleshooting procedures, always review these basic points.
1) Check for 120 VAC power to the furnace. If there is no voltage, check the
disconnecting switch for circuit breaker trip or blown fuses.
2) Make sure the room thermostat is set on the heating mode and is “calling for
heat”.
3) Check for sufficient oil supply and that all oil shutoff valves are open.
4) To successfully service this oil furnace, the following recently (within the last
year) calibrated instruments must be available.
• Smoke spot test kit with Bacharach-type oil burner smoke scale
• Carbon dioxide (CO
2
) and carbon monoxide (CO) test kit or analyzer
• Flue gas temperature measuring instrument
• Draft gauge, capable of measuring 0.01 to 0.25 in. W.G. draft
(Draft is the pressure differential between the static pressure measured in
the vent pipe, or just above the combustion chamber, and the indoor
atmospheric pressure. Under normal operating conditions, it will have a
negative value, i.e. the pressure in the combustion chamber and the vent
system are less than room air pressure.)
• Multimeter (analog or digital type)
• Oil pressure gauge, capable of measuring at least 0 to 200 PSIG
• Burner electrode and nozzle setting gauge
5) Be familiar with the correct operation of these instruments as well as how to
adjust the oil burner settings (refer to burner manufacturer’s literature).
A. Symptom: Furnace does not operate.
Items to check:
c WARNING: Repeated operation of the oil primary safety control
reset button can cause a build-up of unburned oil in the combustion
chamber. An accumulation of oil in the combustion chamber is a
hazardous situation and may cause a fire or explosion.
1) Make sure the disconnecting switch is “ON” and the circuit breaker has
not tripped, or fuses have not blown.
2) Confirm there is 120 VAC at the fan center junction box.