Refrigerant Line Set Verification Checklist PDF

Full QC Checklist+

Verify inputs/sizing method, capacity and refrigerant charge verification, elevation and installation requirements, and commissioning/final checks.

✓26 Inspection Points

✓4 Verification Categories

✓Inputs & Sizing Method+

System Capacity matches the actual equipment's rated capacity, not a guessed or rounded figure
System Type and Compressor Type match the actual outdoor unit's nameplate/spec sheet, not a default guess
Suction Line Diameter matches the actual equipment's spec sheet or installation manual, not a free choice
Straight (Linear) Line Length measured or accurately estimated from the actual routing plan, not guessed
Elbow counts (90° and 45°) reflect the actual planned routing, not a rough guess
Total Equivalent Length and Straight Length both confirmed within the published maximum for the selected compressor type
If this is a two-stage heat pump: Suction Line Diameter confirmed against Table 5-3's own diameter restrictions, not just the general capacity/diameter list
Outdoor Unit Position (same level / above / below) matches the actual site layout, not assumed — including confirming "Same Level" genuinely applies (10 ft or less separation)

✓Capacity & Refrigerant Charge Verification+

Capacity Multiplier and Derated Capacity reviewed and understood as a real, sourced consequence of line length — not treated as an error to dismiss
Additional Refrigerant Charge added to the factory charge BEFORE final commissioning, using the correct sign (adding, not replacing)
System confirmed to use R-410A refrigerant — this calculator's charge-rate figures do not apply to R-32, R-454B, or other refrigerants
If using 1/2in suction: Additional Refrigerant Charge treated as an approximate floor, not a validated figure
Final subcooling/superheat verification planned as a required step after adding the calculated refrigerant charge, not skipped
Equivalent Length (used for capacity derating) and Straight Length (used for refrigerant charge) not confused with each other

✓Elevation & Installation Requirements+

Vertical Elevation Difference measured or accurately estimated, not guessed
If flagged: an inverted oil trap installed at the indoor unit's suction connection before commissioning
If outdoor unit is below indoor: an inverted suction trap installed (always required), plus an accumulator if this is an air conditioner over 79 ft of actual line length
If this is a heat pump (any position), OR an air conditioner below the indoor unit: liquid line solenoid installed at the outdoor unit, unless a non-bleed TXV is used
If flagged as exceeding any published hard maximum (length OR elevation): an alternative equipment selection, routing, or manufacturer-specific accessory solution identified before proceeding
Actual installed or selected equipment's own manufacturer installation manual cross-checked against this calculator's Goodman/Amana-sourced figures
Long-radius elbow fittings used in the actual installation, matching this calculator's modeled elbow-loss assumption

✓Commissioning & Final Checks+

Line set pressure-tested and confirmed leak-free before evacuation and final charging
System evacuated to the equipment manufacturer's specified vacuum level before charging, not skipped or rushed
Suction line insulated to at least the current locally-adopted code minimum (R-3 per the 2024 IRC; some jurisdictions may still enforce the R-4 minimum from the 2015/2018 IRC)
Line set properly supported/strapped and not in direct contact with building structure along its full run
Licensed HVAC/refrigeration technician sign-off obtained before relying on this as a final design

Inspection Notes+

Use the latest approved drawings, specifications, and site measurements.

Complete all critical checks before proceeding to the next work stage.

Record deviations and confirm rectification where required.

Inspection Notes

Use the latest approved drawings, specifications, and site measurements.

Complete all critical checks before proceeding to the next work stage.

Record deviations and confirm rectification where required.

Use it after collecting the project inputs and again before approving or closing the relevant work stage.

No. It supports verification but does not replace approved drawings, specifications, codes, manufacturer requirements, or professional inspection.