Commercial Vehicle, Bus & Coach Manufacturing worked example

HVAC Charge Time at 25% setup, leak-check and documentation allowance: a worked example

What does the result look like when setup, leak-check and documentation allowance reaches 25%? The full calculation is worked below with real intermediate numbers. planning HVAC evacuation, charge, and verification time

The inputs for this scenario

  • Bus HVAC systems to evacuate and charge: 18 units (unchanged)
  • HVAC charge completion pace: 2.4 units / hr (unchanged)
  • Setup, leak-check and documentation allowance: 25 % (raised for this scenario; the documented default is 22)

Working through the calculation

  • Applying the documented formula (Base hvac charge time = HVAC systems to evacuate and charge รท HVAC charge completion pace) to the inputs above produces each figure below.
  • At this operating point the engine returns 9.38 hr for estimated hvac charge time, the number this scenario is built around.
  • At this operating point the engine returns 7.5 hr for base hvac charge time.
  • At this operating point the engine returns 25 % for hvac setup, leak-check, and documentation allowance.
  • At this operating point the engine returns 2.4 systems / hr for hvac charge completion pace.

How this compares with the baseline

  • Against the tool's baseline example, where setup, leak-check and documentation allowance sits at 22% and the headline result is 9.15 hr, this scenario comes in 2.46% above the baseline at 9.38 hr.
  • A figure at this level is achievable when setup, leak-check and documentation allowance is genuinely sustained, not just peaked for a shift. The pace assumes a single charging station running steadily; it does not model recovery-machine vacuum-hold time on a system that fails leak-down, which can double the time for an individual unit.

Results at a glance

  • estimated hvac charge time: 9.38 hr (headline result)
  • base hvac charge time: 7.5 hr
  • HVAC setup, leak-check, and documentation allowance: 25 %
  • HVAC charge completion pace: 2.4 systems / hr

Run it with your numbers

  • Every input above is editable in the live HVAC Charge Time calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.