AHU Installation

Last updated on Mar 1, 2025

SCOPE AND PURPOSE

This "Method Statement" covers the on-site installation of AIR HANDLING UNITS (AHUs) and the requirements of checks to be carried out.

REFERENCE DOCUMENTS

· Project Specifications
· Approved shop drawings (latest revision)
· Approved material submittals

GENERAL

Air Handling Units generally be installed in locations shown in drawings, serving corridors and supplying treated fresh air to the lobbies and apartments located on various floors.

EQUIPMENT

· Drilling Machine
· Spirit Level
· Lifting Equipment (Cranes)
· Rollers
· Scaffolding
· Hand tools of Tradesmen

RESPONSIBLE PERSONNEL

· Project Engineers
· Construction In-Charge.
· Site Engineer/Site supervisor.
· QA/QC Inspectors.
· Safety officer
· Site Foremen.
· Pipefitters
· Helpers

METHOD OF PRE INSTALLATION

Ensure that the approved material required to carry out work is available.
Check the nameplate details of Air handling Units as per the approved shop, drawing/schedules, and material submittals before installation.
Prior to the commencement of work, the area and access will be inspected to confirm that the site is ready to commence the work
The site engineer will check all relevant documentation and material applicable to particular sections of work before commencement.

Physical verification of material will be carried out for any damages prior to taking it from stores.
The site engineer/supervisor will instruct the tradesman and provide necessary construction/shop drawings.
The site engineer/supervisor will also check that the tools and equipment available are in compliance with contract requirements.
The site supervisor also explains to tradesmen regarding safety precautions to be observed.
Ensure that all lifting operations are carried out as per the approved procedure.

METHOD OF INSTALLATION

Prior to the commencement of work, coordination will be done with other services.
Check the foundation of AHU for size, orientation, and finishes as approved shop drawing
Make sure that AHUs are free from damage and that all internal components are complete and in good condition.
AHUs will be installed in the location as per the approved shop drawing.
Install the AHUs on a concrete foundation by using suitable equipment recommended by the manufacturer (eg. Rollers/jacks etc.). The manufacturer's recommendations will be followed during the erection of AHU.
Multi-section units will be joined as per Manufacturer's instructions. Ensure to remove Shipping Bolts.
Ensure the orientation of AHUs as per approved shop drawings during installation.
Serrated rubber pads (Neoprene Isolator) will be provided below AHUs.
AHUs that are ceiling-suspended will be mounted by using threaded rods, spring hangers, etc. as per approval.
Any cut edges of angles, channels, or threaded rods will be touched up with Zinc rich paint for ceiling-suspended AHUs.
Connect all piping and accessories to AHUs as per the approved shop drawing.
Ensure that Dielectric unions/Flanges are used for piping connection to AHUs.
Ensure that drain connections are made with adequate slope and approved U-trap.
Complete the duct connections to Air handling Units as shown in the approved shop drawing.
Filters of specified sizes will be provided.
Check that adequate space for maintenance of Air Handling Units is provided as per the approved shop drawing.
Complete the Electrical power connection including earthing in all respects as per the approved electrical drawing and Manufacturer's recommendations.
Complete the BMS interfacing with DDC controllers as per approved BMS drawings.

QUALITY CONTROL

QC Engineer along with Project Engineer and Site Supervisor will monitor that all components are installed as per the contract specifications and approved submittals.
Inspection Request (IR) shall be submitted to the Main Contractor/Consultant.

SAFETY

Work will commence as per safety regulations laid down in the contract specification and project safety plan.
Proper safety harness to be used and secured, if required.
All personal protective equipment shall be used as appropriate according to the nature of the job.
Housekeeping shall be of good standard and all cut lengths and debris shall be removed.
All lifting operations shall be monitored by Safety Officer.