HVAC worker cheat sheets built for repeat field use in Australia
Built for Australia field work where reverse-cycle splits, ducted systems, zoning, latent-load issues, and roof-space installation realities shape the day-to-day call mix. These are original quick-reference sheets for techs and installers. Use them for faster diagnosis, safer handoffs, and cleaner callbacks. Always follow manufacturer data, lockout/tagout procedure, and local code when the cheat sheet and the equipment disagree.
- Expect C and metric language in the field, with airflow and fan checks often tied to compact ducted systems or wall splits.
- Humidity, condensate, and zoning behavior matter heavily on cooling-driven call volume.
- Electrical isolation and refrigerant handling discipline must stay clear in the service record on every split-system job.
- Reverse-cycle split faults, condensate problems, and drain-related callbacks.
- Ducted zoning, static pressure, and room-balance complaints in larger homes.
- Heat-pump heating performance and defrost behavior during cooler periods in southern climates.
- Local electrical and refrigerant-handling requirements should shape the work process before parts are changed.
- Roof-space access, insulation, and condensate routing details belong in the ticket because they often drive repeat calls.
- If the system design is part of the problem, write that clearly instead of closing the job around a temporary symptom fix.
- For split-system cooling callbacks and ducted zoning complaints.
- When drainage, airflow, and refrigerant symptoms overlap in humid conditions.
- To keep field notes sharper on roof-space and access-limited repairs.
Airflow references your crew can use on the next call
Airflow, CFM, and Static Pressure Quick Check
Use this when you have hot and cold rooms, noisy returns, frozen coils, or a unit that feels starved for air.
Cooling Delta-T and Split Temperature Sanity Check
A quick field reference for using return-to-supply temperature difference without over-reading one number.
Electrical references your crew can use on the next call
24V Control Circuit Troubleshooting Ladder
Use this for no-cool, no-heat, or no-fan calls when the low-voltage circuit is the likely control failure point.
Capacitor and Contactor Field Checks
A fast reference for the two outdoor-unit failures you can lose a day on if you skip the basics.
Refrigeration references your crew can use on the next call
Heating references your crew can use on the next call
Heat Pump Defrost Troubleshooting Cheat Sheet
A field-side reference for when the outdoor unit is icing, short-defrosting, or never defrosting at all.
Gas Furnace Sequence of Operation and Safeties
A quick ladder for no-heat calls so you can prove exactly where the sequence breaks.