What is required for a mini-split installation to satisfy AS/NZS 5149?

AS/NZS 5149 requires that refrigerating systems and heat pumps be designed installed and tested to control refrigerant leakage and ensure safe operation. For a mini-split this means flare connections must be torqued to the manufacturer specification the refrigerant pipe and line set must be pressure tested with dry nitrogen the system must be evacuated to a deep vacuum before refrigerant release and any refrigerant work must be carried out by an ARCTick licensed technician under the Ozone Protection and Synthetic Greenhouse Gas Management Act 1989. Commissioning documentation provides the evidence that these requirements were met.

What vacuum should be achieved before releasing the refrigerant charge?

Most mini-split manufacturers specify a vacuum of at least 500 microns measured with a calibrated micron gauge held for a defined period without significant rise. A vacuum that rises rapidly after the pump is isolated indicates either a leak in the line set or moisture remaining in the system. Both conditions require investigation and remedy before the refrigerant is released. Record the achieved vacuum the hold time and any rise observed on the commissioning checklist as warranty evidence.

How is the additional refrigerant charge for line length calculated?

Manufacturers publish a base line length included in the factory charge (typically 5 to 7.5 metres) and a kilograms-per-metre additional charge rate for line lengths above that. Measure the total installed line length subtract the base length multiply the remainder by the manufacturer rate and add that quantity of refrigerant after the system is energised. Record the calculation the kilograms added and the cylinder batch number in the commissioning checklist so the running system charge is documented for future leak checks.

Who is qualified to commission a mini-split installation in Australia?

Commissioning requires an ARCTick refrigerant handling licence for any refrigerant work (pressure test evacuation charging leak detection) under the Ozone Protection and Synthetic Greenhouse Gas Management Act 1989. Electrical termination requires a state-issued electrical licence. In practice a single installer often holds both licences for residential and small commercial work. For larger commercial multi-head systems the commissioning agent may be a dedicated mechanical services contractor working alongside a licensed electrical worker. All qualifications must be recorded on the commissioning checklist.

Does commissioning need to be repeated if the unit is later moved or serviced?

Yes for any significant work. Relocation of the indoor or outdoor unit requires a new pressure test evacuation and recharge because the line set has been disturbed. Compressor replacement or any work that opens the refrigerant circuit requires the same. Routine annual servicing that does not open the refrigerant circuit does not trigger a full recommissioning but the readings should be benchmarked against the original commissioning record. Manufacturers often condition warranty continuation on documented recommissioning after relocation or major refrigerant work.

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Free mini-split installation and commissioning checklist (PDF-ready). Covers refrigerant flare pressure test evacuation charge and performance.

Jarrod Milford

Commercial Director

Updated 18 May 2026

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Updated 18 May 2026

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What is a mini-split installation commissioning checklist?

A mini-split installation commissioning checklist is a structured handover form used by HVAC installers to verify that a single or multi-head mini-split air conditioning system has been installed and commissioned to manufacturer specification before handover to the building owner. The checklist documents the mechanical installation (indoor and outdoor unit mounting refrigerant line set flare connections drain) the refrigerant procedures (pressure test evacuation to deep vacuum additional charge if any) the electrical termination and the post-energise performance verification across heating and cooling modes. Each step is signed and dated so the installer can demonstrate the manufacturer warranty conditions were satisfied at handover.\n\nIn Australia mini-split installation falls under AS/NZS 5149 (refrigerating systems and heat pumps safety and environmental requirements) and AS/NZS 3823 (performance of electrical appliances and air conditioners). Any refrigerant work requires an ARCTick licence under the Ozone Protection and Synthetic Greenhouse Gas Management Act 1989 and the electrical termination must be carried out by a licensed electrical worker under state legislation. ASHRAE 90.1 also informs commissioning energy performance criteria for projects targeting NABERS or Green Star ratings. A complete commissioning record is increasingly required by manufacturers as a warranty precondition and is the evidence that the installer relies on if a defect dispute arises during the warranty period. MapTrack helps installers retain commissioning records digitally against each unit asset so the handover documentation survives staff and contractor turnover.

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Benefits of using this mini-split installation commissioning checklist

Warranty validation: most manufacturers require a signed commissioning record with pressure test evacuation and refrigerant readings before they honour compressor warranty claims during the first five years
Refrigerant compliance: documents the ARCTick licence number system pressure test result micron-level evacuation reading and any additional charge so installation meets AS/NZS 5149 obligations
Defect prevention: systematic verification of flare connections line set insulation drainage fall and electrical termination catches the install errors that cause the majority of first-year mini-split callouts
Energy performance: confirms supply air temperature and capacity delivery in both heating and cooling modes match manufacturer specification before the building owner accepts handover
Tenant protection: post-energise sound level checks and condensate flow verification reduce the comfort and water-damage complaints that consume installer time during the defects liability period
Handover documentation: a complete signed checklist with photographs and readings is the audit-ready evidence relied upon during warranty claims insurance reviews and end-of-defects-period inspections

Benefits of digitising forms in MapTrack

When you digitise mini-split checklists in MapTrack, you get:

Field users can easily scan a QR code to complete a form on mobile. Unlimited users.
Automatically get alerts when faults are identified.
Link every form digitally as a PDF to the relevant asset, location or person.
Receive a digital PDF copy with every submission to your email.
Ability to share forms digitally.
Build conditional logic (show or hide questions based on answers).
Take pictures or attach photos. Not possible with a paper-based form.
Electronic signatures.
Edit forms later without reprinting.
Restrict permissions (who can view, complete or approve).
Build forms with AI (describe what you need and MapTrack suggests the form).
Log refrigerant charge weights and leak-check results against each unit.
Schedule seasonal changeover inspections tied to heating and cooling cycles.
Track filter, belt and coil replacement intervals per system.

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What to include in a mini-split installation commissioning checklist

This mini-split installation commissioning checklist covers 10 key areas:

Project and asset details: site unit location indoor and outdoor unit make model serial numbers and refrigerant type and factory charge
Mechanical installation: indoor unit level outdoor unit clearance and orientation anti-vibration mounts wall bracket and conduit penetrations
Refrigerant pipe and flare: line set length insulation continuity flare nut torque and witness markings and any extension brazing performed
Pressure test: dry nitrogen pressure test to AS/NZS 5149 with held pressure duration and ambient temperature recorded
Evacuation: vacuum gauge reading in microns hold time and any decay observed before refrigerant release
Refrigerant charge: factory charge plus any additional charge calculated against line length with kilograms added and cylinder batch number
Electrical termination: supply circuit breaker isolator location cable size earth bond test polarity check and indoor outdoor inter-connect
Drainage and condensate: condensate line fall primary and secondary drain (if specified) drain test by pouring water through the indoor unit
Performance verification: supply air temperature in cooling and heating modes capacity check against nameplate and any IR scan of compressor and electrical connections
Handover and sign-off: remote controller demonstration end-user warranty documentation installer ARCTick and electrical licence numbers and client acknowledgement

How to use this mini-split installation commissioning checklist

Complete mechanical installation and pre-energise checks: confirm the indoor unit is level the outdoor unit has the manufacturer-required clearance line set bracketing is correct and all flare connections have been torqued to the manufacturer specification and witness marked
Conduct the refrigerant pressure test: pressurise the line set with dry nitrogen to the manufacturer specification (typically the high-side design pressure) hold for the required duration and record the held pressure and any temperature-corrected pressure decay
Evacuate the system to deep vacuum: connect a calibrated micron gauge and vacuum pump evacuate to at least 500 microns isolate the pump and verify the vacuum holds for the required period without a rise that indicates a leak or trapped moisture
Release the factory charge and add any additional refrigerant: open the service valves to release the pre-charged refrigerant into the line set then calculate and add any additional charge required for line length above the manufacturer-supplied amount recording the kilograms added and cylinder batch number
Energise and verify electrical installation: switch on the supply circuit confirm correct supply voltage polarity and earth bond test the indoor outdoor inter-connect cable and verify the circuit breaker and isolator operate correctly under load
Run the system in cooling and heating: operate the unit in cooling mode and measure supply air temperature then switch to heating and repeat the measurement recording delta-T and capacity against the manufacturer specification across the full thermostat range
Demonstrate to the client and complete handover: pour water through the indoor unit to verify drainage demonstrate the remote controller functions hand over the warranty documentation and obtain the client signature on the commissioning checklist with the installer ARCTick and electrical licence numbers recorded

In MapTrack, you can track hvac maintenance and service schedules. Each submission is stored as a timestamped PDF against the asset record.

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How often should you complete this checklist?

Mini-split commissioning is performed once at installation with the signed checklist retained for the life of the asset as warranty evidence. A re-commissioning is typically required after any major refrigerant work (recovery recharge or compressor replacement) relocation of the indoor or outdoor unit or any electrical alteration that affects the supply circuit or controller wiring.\n\nIn Australia AS/NZS 5149 requires refrigerant systems to be pressure tested and evacuated before charging and AS/NZS 3823 sets performance criteria that commissioning verifies. Manufacturer warranty conditions often require recommissioning if the unit is subsequently moved or significantly serviced. MapTrack retains the commissioning record digitally against each asset for the life of the system so warranty claims and defect investigations have full evidence.

Frequently asked questions

Applicable regulatory standards

This template aligns with the following regulations and standards:

AS/NZS 5149
AS/NZS 3823
ASHRAE 90.1
Ozone Protection and Synthetic Greenhouse Gas Management Act 1989
WHS Act 2011

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