Designing systems that work and proving they do: Manuals J, S, D and T, heat pump sizing, line sizing, commissioning, performance verification and modern diagnostics.

12 skills in 5 sections · listed in learning order

Load & equipment selection

1. Manual J load calculation

   Calculate room-by-room heating and cooling loads from the envelope, orientation, infiltration and internal gains.

   Core No courses yet

2. Manual S equipment selection

   Select equipment whose rated sensible and latent capacity at design conditions matches the load, within the allowed oversizing limits.

   Core No courses yet

3. Heat pump sizing strategies

   Size heat pumps for cooling, partial heating or full heating depending on climate, and check the ductwork and electrical service can support the choice.

   Advanced No courses yet

Duct design

1. Manual D duct design

   Size supply and return ducts from available static pressure, friction rate and equivalent length so each room gets its design airflow.

   Advanced No courses yet

2. Manual T air distribution

   Select and place registers, grilles and diffusers for throw, spread and noise so conditioned air mixes in the room.

   Advanced No courses yet

3. Refrigerant line sizing

   Size liquid and suction lines for capacity, oil return and pressure drop, including long and vertical runs.

   Advanced No courses yet

Commissioning

1. Commissioning fundamentals

   Follow a commissioning sequence that proves airflow, electrical and refrigerant performance before the customer takes over.

   Core No courses yet

2. Total system performance verification

   Measure delivered capacity against rated capacity using airflow, enthalpy and temperature split, and account for the shortfall.

   Advanced No courses yet

Performance optimisation

1. Existing system performance optimisation

   Improve an installed system's efficiency and comfort through measured adjustments, and quantify the operating cost savings.

   Advanced No courses yet

Diagnostic method

1. Wireless probes and diagnostic apps

   Use wireless pressure, temperature and psychrometric probes with a diagnostic app to capture a full system snapshot.

   Core No courses yet

2. Systematic troubleshooting method

   Apply a repeatable diagnostic approach: gather data, form a hypothesis, test it and verify the fix.

   Core No courses yet

3. Fault codes and board-level diagnostics

   Interpret control board fault codes and histories and replace indoor and outdoor boards without guessing.

   Advanced No courses yet