How-to / best practice

Aircon installation checklist for safer handover

Use a consistent installation checklist to reduce leaks, drain callbacks, poor airflow, noise complaints and commissioning uncertainty.

Updated 2026-09-01 · 6 min read · Air-conditioning installers, contractors, merchants and apprentices

Safety and scope note

This article is educational and does not replace manufacturer instructions, qualified technician judgement, South African regulatory requirements, electrical or refrigerant safety rules, or a site-specific risk assessment.
Electrical supply, condensate routing and refrigerant work must be suitable for the site and equipment.
Work at height, roof access and drilling require separate risk assessment and competent practice.

Before mounting the indoor and outdoor units

A good installation starts before drilling. Confirm equipment capacity, room use, owner expectations, drainage route, outdoor-unit clearance, service access, condensate management and electrical supply. Site layout matters as much as the model selected.

South African homes and small businesses can have challenging walls, sun exposure, coastal corrosion, load-shedding arrangements and limited drain routes. Discuss these constraints before committing to a position that will be difficult to service or unsafe to reach later.

Check manufacturer clearances for indoor and outdoor units.
Confirm safe access for future filters, cleaning and service panels.
Plan gravity drain fall or pump access before fixing pipe route.
Protect pipework and cabling from rubbing, UV exposure and sharp edges.

Pipework, flares, drainage and evacuation

Pipework quality often decides whether the job returns as a leak, oil issue or poor-performance complaint. Use correct pipe sizes, avoid kinks, support runs, insulate correctly and make clean flares with compatible nuts and torque practice.

Drainage should be tested before leaving site. A drain with poor fall, trapped sections or no service access can cause water damage even when the refrigeration circuit is correct. Evacuation and charging should follow the manufacturer procedure, with vacuum and charge documented.

Pressure-test and leak-check joints as required before commissioning.
Evacuate with suitable hoses, pump oil and a vacuum gauge.
Weigh additional charge where pipe length requires it.
Run water through the drain and check for leaks, traps and backfall.

Commissioning and customer handover

Commissioning is the proof that installation decisions worked. Record supply and return temperatures, operating mode, fan speed, outdoor conditions, voltage, current, drain behaviour and any model-specific checks. Give the customer basic filter, remote and maintenance guidance without promising performance outside the unit design.

A written checklist protects the installer, helps apprentices learn and gives merchants a better support trail if equipment warranty questions arise.

Quick field checklist

Confirm unit location, clearances, drain route and service access.
Use correct pipe sizes, insulation, support and flare practice.
Leak-check, evacuate and charge according to the model instructions.
Test drainage and record commissioning readings.
Explain filter cleaning, remote use and service intervals to the customer.

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