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Split System Install
An Introduction to the Split System Installation Process
Table of Contents
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Introduction to Split System Air Conditioners
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Initial On-Site Evaluation
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Choosing the Right System for Your Home
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Pre-Installation Preparations
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Arriving on Installation Day
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Indoor Unit Installation Steps
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Outdoor Unit Installation Steps
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Connecting Refrigerant Lines and Wiring
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Testing, Commissioning, and Clean-Up
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Post-Installation Maintenance Tips
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Common FAQs
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Conclusion
1. Introduction to Split System Air Conditioners
A split system air conditioner consists of two main components:
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Indoor Unit: The wall-mounted evaporator unit that circulates cool air into your living space.
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Outdoor Unit: The condenser/compressor unit placed outside your home that expels heat and circulates refrigerant between the two components.
This setup allows for efficient temperature control and is known for its relatively quiet operation and low power consumption. Split systems are especially popular in homes without space for ductwork, as they offer an alternative to central air conditioning systems without extensive remodeling.
2. Initial On-Site Evaluation
A. Measuring and Assessing the Space
The first step to a successful installation begins with an evaluation of the home and areas via plan, video call or in-home visit. A qualified HVAC technician will:
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Measure the Square Footage: Determine the size of the area you want to cool or heat.
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Assess Heat Load Factors: Windows, doors, insulation quality, and ceiling height are critical in deciding the right capacity for your split system.
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Inspect Electrical Capacity: Ensure your home’s electrical panel can handle the additional load of the new unit.
B. Checking Wall and Location Suitability
During the visit, the technician will also note:
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Possible Locations for the Indoor Unit: Typically, a high wall location for optimal airflow.
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Potential Mounting Points for the Outdoor Unit: This could be ground-level, a poly slab, or a wall bracket.
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Drainage and Ventilation Needs: Ensuring the outdoor unit has enough space around it for proper airflow and easy drainage.
3. Choosing the Right System for Your Home
Once your space is evaluated, you’ll work with the HVAC professional to decide on the ideal split system. Key considerations include:
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Unit Capacity (KW/h): Correct sizing is crucial. An undersized system struggles to maintain comfort, while an oversized system can short-cycle and waste energy.
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Energy Efficiency Ratings (SEER/EER): Higher ratings often cost more upfront but can offer significant long-term savings on energy bills.
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Brand and Warranty: Reputable HVAC brands often provide longer warranties and just as important, better service support.
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Additional Features: Options such as Wi-Fi connectivity, air purifying filters, or built-in dehumidifiers may enhance comfort and convenience.
4. Pre-Installation Preparations
A. Gathering Necessary Permits
Depending on your location, you may need certain permits or approvals before installing an air conditioner from things like Body Corporate. Check with local authorities or homeowner associations to avoid any compliance issues.
B. Ordering and Staging Materials
Your installer will typically order the split system unit (This is ideal for warranty issues), mounting brackets, copper refrigerant lines, electrical wiring, and other necessary components. They’ll also ensure any custom parts (like specialized line set lengths) are ready.
C. Scheduling the Installation
After gathering permits and materials, you’ll finalize a date for the installation. Clear the area around both the indoor and outdoor installation points to give technicians sufficient space to work.
5. Arriving on Installation Day
On the day of the installation, you can expect your HVAC professionals to:
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Arrive with the Equipment and Tools: They’ll bring ladders, drills, vacuum pumps, refrigerant gauges, and other specialized tools.
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Confirm the Installation Plan with You: They’ll walk you through the exact placement of the indoor and outdoor units to ensure you’re on the same page.
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Protect Your Home: Vacuum, drop cloths or protective floor coverings are often used to keep your home clean during drilling or mounting.
6. Indoor Unit Installation Steps
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Marking the Indoor Location: Your technician will verify the final position for the indoor unit. This spot is typically high on the wall, away from direct sunlight or large obstructions, and near an external wall for easy access to the outdoor unit.
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Mounting the Indoor Bracket: A metal bracket is fixed to the wall. This bracket holds the weight of the indoor unit and ensures it’s level and secure.
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Creating an Access Hole: A small hole (usually 2 to 3 inches in diameter) is drilled through the wall for refrigerant pipes, drain line, and electrical wiring. The hole is sealed after installation to prevent air leaks and moisture issues.
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Hanging the Indoor Unit: The indoor unit is then carefully hung on the bracket. The installer will feed the piping and wiring through the hole in the wall as they position the unit.
7. Outdoor Unit Installation Steps
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Selecting the Outdoor Placement: The outdoor unit should be in a well-ventilated area, typically on a solid concrete slab or mounted on a bracket against an external wall.
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Ensuring Level Placement: A level surface is crucial to ensure proper compressor function and reduce noise or vibration. If needed, the technician may use rubber pads or anti-vibration mounts.
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Preparing the Site: Vegetation or debris around the outdoor unit is cleared to maintain at least a few feet of open space for airflow and servicing.
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Positioning and Securing the Outdoor Unit: The outdoor unit is placed onto its slab or bracket and secured. The refrigerant ports and electrical connections are then made accessible for the next steps.
8. Connecting Refrigerant Lines and Wiring
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Measuring and Cutting the Lines: Copper refrigerant lines are cut to the correct length, then flared or brazed for airtight connections.
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Running Drain and Electrical Lines: The condensate drain line is attached to allow water to flow away from the indoor unit. Electrical wiring is run between the indoor and outdoor units.
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Vacuum and Leak Testing: The technician uses a vacuum pump to remove air and moisture from the refrigerant lines, then checks for leaks with specialized gauges. This step is critical to ensure efficiency and longevity.
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Releasing the Refrigerant: Once the system is vacuumed and leak-free, the outdoor unit’s service valves are opened to release refrigerant into the system.
9. Testing, Commissioning, and Clean-Up
After the physical installation is complete, the technician will:
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Power Up the Unit: Turn on the main power and test the system in cooling and/or heating modes (if it’s a reverse-cycle model).
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Check Airflow and Temperatures: Confirm that the indoor unit is blowing cool or warm air at the expected temperature differential.
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Inspect Electrical Components: Ensure all wiring is secure and that no breakers are tripping.
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Final Clean-Up: Technicians often tidy up their work area, remove any debris, and re-seal any necessary openings.
10. Post-Installation Maintenance Tips
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Clean the Filters Annually: A clogged filter restricts airflow, reducing efficiency and risking damage to the unit.
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Schedule Annual Inspections: Preventative maintenance helps catch minor issues before they become major (and expensive).
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Keep the Outdoor Unit Clear: Ensure no plants or debris accumulate around the outdoor condenser.
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Monitor Utility Bills: A sudden spike could indicate a refrigerant leak or mechanical issue.
11. Common FAQs
Q1: How long does a split system installation take?
A: Most residential installations take 4–8 hours, depending on complexity and the number of indoor units.
Q2: Can the outdoor unit be placed on a balcony?
A: Yes, if there is adequate ventilation and structural support. However, it’s generally recommended to place it in an open area to avoid noise and airflow restrictions.
Q3: Do I need a dedicated electrical circuit?
A: In most cases, yes. Consult with a licensed electrician or HVAC technician to determine if you need to upgrade your electrical panel.
Q4: How often should I have my system serviced?
A: A yearly inspection is recommended however it does depend how often you use your new system. After your first service, we will recommend a service schedule that makes sense to you.
12. Conclusion
A split system air conditioner is a fantastic choice for efficient, quiet, and versatile home climate control. From the initial on-site evaluation to the final handover, understanding each step of the installation process helps you make informed decisions and sets you up for many comfortable years ahead.
Ready to enhance your home comfort? Our experienced HVAC professionals can guide you through selection, installation, and ongoing maintenance of your split system. Contact us today to schedule your initial consultation and experience the difference a professionally installed split system can make.
What's involved, in a service?
At Bellair Cooling, we believe in being transparent when it comes to all our work... be it installation or service and repair. We present below, a comprehensive guide we use each and every service for split system air conditioners, split ducted air conditioners, evaporative coolers and ducted gas heaters.
If you're looking for "split system repair near me" for example, although we do need to go through some of the split system aircon maintenance check, it is still best to let us know up front if the system is playing up as it will usually give you a faster and less costly repair.

Split System Aircon Maintenance
Thorough Visual Inspection:
Our team carefully inspects both the indoor and outdoor units for any debris, dirt, and visible issues.
We check for bent or damaged fins, rust, corrosion, and loose electrical connections.
We ensure your unit is level and stable, guaranteeing optimal performance.
Precise Pressure Readings:
We use state-of-the-art digital pressure and temperature gauges to measure the refrigerant levels and ensure your system is operating efficiently. Our technicians record and assess suction and discharge pressures, superheat, and subcooling to fine-tune your system’s performance.
Advanced Electrical Checks:
We safely inspect all electrical wiring and connections using cutting-edge thermal imaging technology to detect any hotspots or potential issues. Any loose connections are promptly tightened to prevent future problems.
Comprehensive Filter and Coil Cleaning:
Air filters are inspected and cleaned to maintain air quality and system efficiency.
We use specialized cleaning solutions and tools to clean indoor and outdoor coils, ensuring optimal heat exchange. Our steam cleaning process, should you need it, effectively removes all that mold and mildew from the coils and other components, improving air quality and system hygiene.
Effective Drain Line
We inspect and clear the condensate drain line to prevent blockages and water damage.
Fan Maintenance:
Indoor fan blades are checked for cleanliness and balance, and cleaned as necessary to ensure smooth operation.
Flare Nut Tightness Testing:
We check and tighten all accessible flare nuts using a specialised HVAC torque spanner, ensuring secure and leak-free connections.
Comprehensive System Performance Check:
After servicing, we run your unit and verify its cooling or heating effectiveness.
We take and compare digital gauge readings and air-off temperature readings before and after the service.
We document all readings, provide before-and-after comparisons, and offer recommendations for any necessary repairs.
Detailed Documentation:
We compile all readings, pictures, and notes into a comprehensive maintenance report.
Our report includes clear recommendations for any necessary repairs or adjustments to keep your system running smoothly.
Evaporative Cooler Maintenance
Initial System Inspection:
Check the overall condition of the cooler unit, including the fan, motor, and water distribution system.
Inspect for visible signs of wear, rust, or damage to the exterior housing and interior components.
Test the power supply and connections for safety and reliability.
Cleaning:
Remove and thoroughly clean the cooling pads to eliminate dust, dirt, and mineral deposits.
Clean the water tank, pump, and distribution system to prevent buildup of algae, mold, or sediment.
Clear any debris or blockages in the air ducts and vents to ensure optimal airflow.
Clean the fan blades, motor housing, and other internal components to prevent dust accumulation and maintain efficiency.
Water System Inspection and Maintenance:
Check the water pump for proper operation and ensure it is delivering adequate water to the pads.
Inspect the water supply line for any leaks, damage, or blockages.
Test and adjust the water level in the reservoir to ensure it is at the correct level for efficient cooling.
Ensure the float valve is functioning correctly to prevent overflow or low water levels.
Mechanical and Electrical Inspection:
Inspect the fan motor and belt (if applicable) for wear, tension, and alignment. Replace the belt if necessary.
Check all electrical connections, wiring, and controls for safety, proper function, and signs of wear.
Lubricate moving parts such as the fan bearings and motor, if applicable, to reduce friction and wear.
System Testing:
Test the cooler’s functionality by running it through all settings to ensure proper operation.
Check the thermostat (if installed) for accurate readings and proper interaction with the cooler.
Measure airflow output to ensure the system is delivering adequate cooling.
Final Inspection and Reporting:
Conduct a final walkthrough with the customer, explaining any work performed and parts replaced.
Provide a detailed service report, including any recommended repairs or future maintenance considerations.
Customer Education:
Provide tips on operating the cooler efficiently and maintaining it between professional services.
Advise on how to handle minor issues that may arise, such as basic cleaning and pad replacement.
Ducted Gas Heater Maintenance
Initial System Inspection:
Inspect the overall condition of the ducted gas heater unit, including the burner, fan, heat exchanger, and flue.
Check the exterior of the unit for signs of wear, damage, or rust.
Evaluate the surrounding area for obstructions or flammable materials.
Safety Check:
Test for any gas leaks using a gas leak detector, especially around connections, the gas line, and the burner assembly.
Inspect the carbon monoxide detector to ensure it is functioning properly and positioned correctly.
Ensure the flue or venting system is clear of obstructions and in good condition to safely exhaust combustion gases.
Cleaning:
Clean the burner and ignition system to ensure proper and efficient operation.
Remove dust and debris from the fan, blower, and surrounding components.
Vacuum or wipe down the heat exchanger to remove any dirt or soot buildup.
Clean or replace air filters to maintain good indoor air quality and optimal system performance.
Mechanical and Electrical Inspection:
Inspect the heat exchanger for cracks or damage, which can lead to dangerous carbon monoxide leaks.
Check the operation of the thermostat and any additional controls to ensure proper functionality.
Inspect the fan motor and blower assembly for wear, balance, and smooth operation.
Test all electrical connections, circuit boards, and sensors for proper operation and integrity.
Operational Testing:
Test the system’s operation by running it through all settings, including heating modes and fan settings.
Measure the output temperature at the vents to ensure the heater is providing adequate warmth.
Verify that the system cycles on and off properly according to thermostat settings.
Gas Pressure and Combustion Analysis:
Check the gas pressure to ensure it is within the manufacturer’s recommended range.
Perform a combustion analysis to measure carbon monoxide levels and ensure efficient combustion.
Final Inspection and Reporting:
Provide a detailed report outlining the work performed, the condition of the unit, and any recommendations for future service or repair.
Explain any issues found, parts replaced, or additional work that may be necessary to ensure safe and efficient operation.
Customer Education:
Offer guidance on how to operate the ducted gas heater safely and efficiently.
Provide tips on regular maintenance tasks that the customer can perform, such as checking filters and ensuring vents are not obstructed.
