Service; Troubleshooting - Thermo Products Spirit Series Installation, Operation And Service Manual

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
 Flue gas temperature measuring instrument
 Draft gauge, capable of measuring 0.01 to 0.25 in. W.G. draft
 Multimeter (analog or digital type)
 Oil pressure gauge, capable of measuring at least 0 to 200 PSIG
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.
B. Symptom: Burner short cycles on high limit thermostat, but does not "lock out"
on oil primary safety control.
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 junction box and the oil furnace control
terminal S1.
3) Confirm the room thermostat is wired correctly, set on the "HEAT" mode,
and "calling for heat".
4) Refer to the oil burner manufacturer's operating instructions (included
with the furnace) for primary control troubleshooting
) and carbon monoxide (CO) test kit or analyzer
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