Wall Mounted Bracket: Understanding Clearances for VRF Outdoor Units
While the International Mechanical Code (IMC) provides specific clearance requirements for certain service options, manufacturers also mandate clearances for operational purposes. These manufacturer requirements ensure proper airflow, maintenance access, and overall system efficiency. In this post, we’ll focus specifically on clearances for ductless and single-phase Variable Refrigerant Flow (VRF) outdoor units.
Wall-Mounted Bracket Considerations
One of the key aspects of installing an outdoor unit is ensuring a secure and stable mounting option, especially when using a wall-mounted bracket. Proper bracket selection is crucial in installations where ground space is limited, or there is a need to elevate the unit for better drainage and protection from debris.
Following Clearance Guidelines
Clearance requirements are essential for optimal performance, and failure to adhere to them can lead to reduced efficiency, restricted airflow, and potential system malfunctions. When it comes to clearances, always refer to three primary sources:
- Local Code Authority
- Manufacturer Installation Guidelines – These can be more stringent than the IMC and are designed to optimize the unit’s performance and longevity.
- The International Mechanical Code (IMC) – Provides baseline clearances for safety and servicing requirements.
If Local Code Authority, Manufacturer, or the IMC requirements differ or conflict with each other, the most stringent of the three apply. This ensures compliance with regulations and maintains warranty validity while optimizing the unit’s functionality.
Common Clearance Requirements for Ductless and Single-Phase VRF Systems
While clearances may vary by manufacturer, common requirements for outdoor units typically include:
- Rear Clearance – Minimum of 4–6 inches for airflow, unless specified otherwise.
- Side Clearance – At least 12 inches to allow for proper heat dissipation.
- Front Clearance – Generally 24 inches or more to ensure adequate airflow and service access.
- Above Unit Clearance – 48 inches or more if placed under an overhang or obstruction.
- Ground Clearance – When wall-mounted, units should be elevated at least 12 inches to prevent obstructions and improve drainage. In cold-climate areas, the unit height must be installed based on the average snow lines applicable areas.
Example: Inaba Denko Condenser Brackets and Risers
Inaba Denko has two condenser bracket options available for residential HVAC/Light Commercial systems. Plarock condenser risers are ideal for ground or roof-mount system. Three sizes are available to support up to 309, 397 and 882 lbs.
The galvanized wall condenser brackets have capacities ranging from 176 lbs. to 330 lbs., perfect for any HVAC system under those weights. These wall-mount brackets are one of the most robust options available, with sturdy material of 18-gauge steel.
To learn more about this topic, watch Kerry McIntyre’s Ask the Trainer video below:
Conclusion
Clearances play a crucial role in the proper installation and operation of ductless and single-phase VRF systems. Whether installing a unit on a robust wall-mounted bracket or placing it on the ground, always prioritize local code authority, manufacturer instructions and IMC regulations. By following these guidelines, you ensure efficiency, longevity, and compliance with safety standards.
If you’re ever in doubt, refer to the manufacturer’s manual and always err on the side of caution by providing ample space for airflow and servicing. Proper clearances will help maximize system performance and reliability in the long run.
