HVAC Air Handling Unit (AHU) Installation | HVAC Engineering

This article is about HVAC Air Handling Unit (AHU) Installation as per International Codes and standards.

HVAC Air Handling Unit (AHU) Installation

1. Air Handling Units (AHU’s) shall be mounted on a concrete housekeeping pad, at a minimum of 100 mm (4″) above the floor or a minimum of 150 mm (6″) above unpaved ground
2. AHU’s shall be installed at the location indicated on the drawings and in accordance with details of mounting
3. Evaporators of air handling units shall be mounted a minimum of 150 mm (6 inch) off the floor.
4. Equipment clearance shall be provided with a minimum of 1 m clearance on each side of equipment with openable panel or controls, unless equipment manufacturer requires greater clearances. Adequate space shall be provided for coil removal
5. Fans shall be V-belt driven.
6. A raw water hose bib with vacuum breaker shall be provided within close proximity (not to exceed 10 feet) of HVAC equipment that require periodic washing.
   Note: Whether the equipment requires periodic washing or not is determined by either the designer, manufacturer or proponent.”
7. Reciprocating compressors shall be vibration isolated from the unit, and frame shall have vibration isolation (such as a vibration pad) between equipment and equipment base.
8. Casings shall include doors to provide maintenance and removal access for all fans, motors, coils, filters, and humidifiers.
9. Access doors or frames shall have resilient gasketing material to prevent air leakage. Access doors shall have corrosion-resistant hinges and positive latches.*
10. Vibration isolators shall be provided between AHU and foundations.
11. The tag or name plate shall be located such that the information is visible and can be read after equipment installation.

Verification is required by checking the equipment submittal if verification is not possible by visual inspection.

Standards Codes and References HVAC Air Handling Unit (AHU) Installation

1- SAES-K-001 — Heating, Ventilating and Air Conditioning (HVAC), 25 November, 2006
2- Uniform Mechanical Code (UMC), 1997

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