Horowhenua District Council

Horowhenua District Council Civic HVAC Replacement

This project involves the upgrade of the existing mechanical services installation at 126 Oxford Street in Levin. The building is owned and managed by Horowhenua District Council.
The scope of this project is to upgrade the existing aging VRF system with a new Hybrid VRF system as part of a roof remediation project, and to upgrade the existing exhaust air ventilation system. The project works comprise:
• Building type: Commercial office (Horowhenua District Council Civic Centre).
• Floors: Two office floors plus basement car parking.
• Net lettable area: ~2,500 m2 excluding the basement.
The work is to be carried out in accordance with the drawings and this specification, but if the contractor has any concerns regarding the work, or any suggestions to improve efficiency, buildability, quality, or economy, they are welcome to raise these with the engineer who will decide on the matters raised. This Civic Building will be occupied with staff while the work is carried out.

The contractor shall include for the supply, installation, modification, testing, commissioning, proving / demonstration and setting to work of all the equipment and materials required to complete the HVAC services. This shall include all skilled labour for the completion of the works, ready for handover to the client in working order, along with all supporting handover documentation.
This specification covers the following services:
• Removal and disposal of the existing VRF system
• Installation of new Hybrid VRF outdoor plant (six units)
• Installation of new Hybrid VRF units (50 indoor units in total)
• Installation of seven Hybrid VRF branch controllers, and all associated refrigerant pipework, water pipework, and domestic water supply and expansion systems.
• Removal and disposal of the existing bar grilles as documented on the demolition plans.
• Installation of new double deflection linear bar grilles.
• Installation of ten new fans replacing the existing fans.
• Condensate drainage to indoor new units and branch controllers.
• Installation of new motorised duct mounted dampers and controls replacing the existing.
• Associated electrical for mechanical and controls work.
• Installation of new backflow prevention system, including commissioning and certification.
• Associated domestic water supply for makeup water.
• Commissioning of new air conditioning systems.

Department/Business Unit: Community Experience and Services