Australian Standard
AS/NZS 3666 Compliance for CRAC Water Systems
AS/NZS 3666 compliance for CRAC water systems, condenser water, chilled water loops, cooling towers and microbial control in Australian facilities.
AS/NZS 3666 applies to air-handling and water systems where microbial control is required. In CRAC work, it is most relevant to condenser water systems, cooling towers, chilled water interfaces and sites where the indoor cooling unit connects to water-based heat rejection.
CRAC Services reviews AS/NZS 3666 touchpoints during CDW and CHW maintenance: water treatment records, tower coordination, strainer condition, valve operation, biological risk controls and whether the indoor unit service aligns with the water-side maintenance plan.
Compliance checks
What we check on CRAC sites
01
Confirm whether the CRAC system connects to a cooling tower, dry cooler, condenser water loop or chilled water loop.
02
Review water treatment records, microbial control records and tower service schedules where applicable.
03
Inspect strainers, valves, actuators, condensate and coil condition.
04
Check flow and temperature delta across the water-side scope.
05
Record defects that could increase biological risk or reduce cooling capacity.
Related services
Services connected to AS/NZS 3666
CDW CRAC Servicing
Condenser water CRAC maintenance for data centres, mechanical switch rooms and critical infrastructure.
CHW CRAC Servicing
Chilled-water CRAC unit maintenance for large data centres and high-density computing environments.
CRAC Maintenance
Preventative CRAC maintenance, quarterly service plans and emergency fault response across all major precision cooling brands.
CRAC Commissioning
ARC-licensed CRAC commissioning, Site Acceptance Test packs and warranty activation support for new and refit installations.
FAQs
Does AS/NZS 3666 apply to all CRAC units?
No. It mainly applies where water systems form part of the cooling or heat rejection path. A small air-cooled DX CRAC with an outdoor condenser may have little AS/NZS 3666 scope, while a condenser water CRAC connected to a cooling tower has clear water system obligations.
Who manages AS/NZS 3666 records for CRAC systems?
It depends on the site contract. Some facilities use one contractor for the cooling tower and another for indoor CRAC units. The key is that records align, because indoor unit faults, poor flow or dirty strainers can affect the same water system risk controls.