Red Seal Oil Heat System Technician cheat sheet
Red Seal Oil Heat System Technician · Keep the key ideas within reach.
Evidence and calculations
Confirm the exact appliance-burner combination and governing documents.
Record symptom timing and changes before adjusting parts.
A stopped burner is not proof of isolated energy.
Input = flow × heating value, on matching unit and reference bases.
Efficiency = useful output / input.
Record pressure units, reference, test point and load.
Do not treat repeated resets as a repair.
Storage and delivery checks
Tank level does not prove usable clean fuel at the pump.
A vent and a return line serve different functions.
Suction lift and friction both affect inlet vacuum.
A suction leak can admit air without an outward oil drip.
Filter service can disturb suction-side seals.
One-pipe and two-pipe configurations must match the fuel unit instructions.
Keep return paths, bypass provisions and component ratings correct.
Burner and vent checks
Match nozzle flow rating, reference pressure, spray angle and pattern.
Use the specified head and electrode geometry.
Cold oil viscosity can affect delivery and spray.
Investigate delayed ignition and abnormal afterdrip.
Flame appearance is not a quantitative carbon-monoxide test.
Distinguish overfire and breech test points.
Verify combustion in the specified assembled configuration.
Primary sequence checks
Trace demand, limits, motor, valve, ignition, flame proof and shutdown.
A cad cell has higher resistance in darkness and lower resistance in light.
An early flame signal can indicate an inappropriate condition.
Use the control-specific timing and diagnostic method.
Distinguish purge, ignition trial, recycle and lockout.
Check both coil and contact ratings for replacements.
A completed steady run does not verify every transition.
Heat delivery and service
Correct input with high air-temperature rise can indicate insufficient airflow.
Check the full supply and return air route.
Hydronic heat delivery depends on circulation and zone conditions.
Expansion accommodation and relief protection are different functions.
Use the approved combined-fuel design where wood and oil interact.
Restore baffles, doors and seals before final testing.
Document restrictions and leave removed systems safely closed and identified.