Service
CDW CRAC Servicing | Brisbane Sydney Melbourne
Condenser water CRAC maintenance for data centres, mechanical switch rooms and critical infrastructure.
CDW (Condenser Water) CRAC systems use a closed water loop connected to an external cooling tower or dry cooler to reject heat from the precision-cooling unit. They are common in mid-to-large data centres where centralised heat rejection is more efficient than per-unit DX condensers.
CRAC Services maintains CDW CRAC systems across Australia — including the loop water side. Our scope covers indoor unit servicing, condenser-water control valve and actuator checks, water-quality testing, and coordination with cooling tower / dry cooler maintenance schedules to AS/NZS 3666 (Legionella control).
Service work is delivered by ARC-licensed refrigeration technicians where the indoor unit contains a DX or chiller stage, and by qualified mechanical service technicians for the water-loop scope.
Scope
Our service
includes
- 01Condenser water valve and actuator checks
- 02Cooling coil clean and airflow balance
- 03Water-loop pressure and flow validation
- 04Pump performance check (delivered head, current draw)
- 05Water-quality test (conductivity, pH, biological)
- 06Strainer clean and isolation valve service
- 07Humidifier descale and water treatment
- 08Control system diagnostics and alarm review
- 09AS/NZS 3666 cooling tower compliance review
Recommended schedule
Preventative service intervals
01
Monthly / Bi-Monthly (in-house)
- Filter inspection
- Strainer check
- Alarm review
- Visual condensate check
02
Quarterly (professional)
- Valve and actuator test
- Pump performance test
- Humidifier descale
- Light coil clean
- Loop pressure validation
03
Annually (comprehensive)
- Full water-loop chemical clean (where required)
- Comprehensive electrical IR scan
- Coil clean both sides
- AS/NZS 3666 compliance audit
- Control firmware update
Equipment
Equipment types
we service
FAQs
Frequently asked questions
What is a CDW CRAC system?
A CDW CRAC system uses condenser water from a cooling tower or dry cooler loop to remove heat from precision cooling equipment. CDW is generally more efficient than air-cooled DX at scale, but adds the complexity of a water-loop service regime including AS/NZS 3666 compliance.
Where are CDW CRAC systems used?
CDW CRAC systems are common in mid-to-large data centres, telecommunications facilities, mechanical switch rooms, and electrical plant rooms — wherever centralised heat rejection is more economic than per-unit DX condensers. They typically appear in builds 500kW+ critical IT load.
Do you also maintain the cooling tower?
We can service the cooling tower under a coordinated programme, or work with your existing tower contractor — many sites have a separate mechanical-services contractor for the tower side. Either way, we'll provide the AS/NZS 3666 compliance review on the water side that ties the indoor and outdoor scopes together.
How is water quality managed?
Closed-loop CDW systems run on inhibited glycol or treated water; open-loop towers run on chemically dosed make-up water. We test conductivity, pH, biological count, and free chemical residual quarterly, and provide a remediation plan if any parameter is out of spec. Legionella testing follows AS/NZS 3666.3 protocols.