Precision Cooling Maintenance Australia
CDW CRAC Servicing Australia - Condenser Water Precision Cooling
CDW (condenser water) CRAC units use a water loop connected to a rooftop cooling tower to reject heat from precision cooling equipment. Unlike DX systems, CDW CRAC servicing focuses on the water circuit, heat exchanger condition, and critically Legionella risk management compliance under Australian WHS regulations and AS/NZS 3666. Indigi Power and Cooling provides professional CDW CRAC servicing for data centres, telecommunications facilities, mechanical plant rooms, and electrical switchrooms across Australia.
Condenser water CRAC systems are common in larger data centres and multi-tenanted commercial buildings where a centralised cooling tower serves multiple CRAC units across the facility. The cooling tower rejects heat from the condenser water loop to atmosphere, allowing the CRAC units to operate without individual outdoor condensers. This architecture is energy-efficient at scale but introduces specific maintenance and compliance obligations that standard HVAC servicing does not cover.
Indigi Power and Cooling is an Indigenous and Veteran-owned critical infrastructure service provider, Supply Nation and ICN Gateway registered. We service Vertiv Liebert, Schneider Uniflair, and all major CDW precision cooling brands from our Brisbane, Sydney, and Melbourne hubs.
What is a CDW CRAC unit?
A CDW (condenser water) CRAC unit removes heat from the server room or data hall by passing room air across a cooling coil, then transferring that heat to the condenser water loop rather than to an outdoor refrigerant condenser. The condenser water circuit carries the heat to a rooftop cooling tower, where it is rejected to atmosphere through evaporative cooling before the water returns to the CRAC units.
CDW CRAC systems are distinguished from other CRAC unit types as follows:
| System Type | Heat Rejection Method | Key Maintenance Distinction |
|---|---|---|
| DX (Direct Expansion) | Refrigerant circuit to outdoor condenser | ARC-licensed refrigerant handling required |
| CDW (Condenser Water) | Water loop to rooftop cooling tower | Legionella risk management compliance required |
| CHW (Chilled Water) | Chilled water from central plant | Water quality and valve testing focus |
Legionella compliance - the critical CDW obligation
Mandatory compliance: CDW CRAC systems connected to a cooling tower are subject to Legionella risk management requirements under Australian state and territory Work Health and Safety regulations and AS/NZS 3666. A written risk management plan, regular water testing, and approved biocide treatment are legally required. Non-compliance creates serious WHS liability exposure.
Legionella pneumophila, the bacterium responsible for Legionnaires disease, can proliferate in cooling tower water systems when water temperatures, nutrient levels, and flow conditions are favourable. Because CDW CRAC cooling towers are typically located on building rooftops and operate continuously, they represent a regulated water system under Australian WHS legislation.
Compliance obligations typically include:
- A written Legionella risk management plan (Water Management Plan) specific to the cooling tower system
- Regular water quality testing, typically monthly, for key microbiological and chemical parameters
- Approved biocide dosing protocols to control biological growth
- Physical inspection and cleaning of the cooling tower, including fill media, basin, and drift eliminators
- Detailed records of all testing, treatment, and inspections maintained for regulatory audit
- Notification to the relevant state authority if the cooling tower is a regulated system under local legislation
Indigi Power and Cooling coordinates Legionella risk management compliance as part of its CDW CRAC servicing programme, working with approved water treatment providers to ensure your system meets state and territory requirements.
CDW CRAC maintenance services included
A standard CDW CRAC service by Indigi Power and Cooling covers the following:
| Service Item | Detail |
|---|---|
| Condenser water loop inspection | Flow rate measurement, pressure checks, pipework condition assessment, and isolation valve testing |
| Cooling coil cleaning and inspection | Evaporator coil inspection and cleaning to restore heat transfer efficiency; coil condition assessment |
| Condenser water valve and actuator checks | Control valve operation, actuator response, and modulation testing; isolation valve condition |
| Water treatment verification | Condenser water quality check; verification of biocide treatment levels; Legionella risk status review |
| Air filter inspection and replacement | Filter condition check and replacement as required; airflow measurement and optimisation |
| Fan motor and belt inspection | Fan motor condition, vibration check, belt tension, and wear assessment |
| Electrical component testing | Contactors, capacitors, power connections, and control wiring inspection |
| Temperature and humidity sensor calibration | Sensor accuracy verification and calibration; setpoint confirmation |
| Alarm and control system verification | Alarm function testing; BMS and SNMP integration check where applicable |
| Written service report | Full documentation of findings, water circuit status, Legionella compliance status, and recommendations |
Recommended CDW CRAC maintenance schedule
CDW CRAC systems require a layered maintenance programme combining in-house checks and professional servicing:
| Frequency | Who Performs | Key Activities |
|---|---|---|
| Monthly / Bi-Monthly | In-house facility team | Filter inspection, condensate pump checks, alarm verification, general system operation review |
| Quarterly | Professional service (Indigi) | Full service checklist above; water quality verification; motor and belt inspection; sensor calibration; Legionella compliance check |
| Annually | Professional service (Indigi) | Electrical inspection and infrared scan, full coil clean, deep system diagnostics, Legionella risk assessment review, compliance documentation update, cooling tower inspection coordination |
CDW CRAC brands we service
- Vertiv Liebert -- PDX, PCW, and CDW-configured Liebert systems
- Schneider Electric Uniflair -- CDW-configured Uniflair CRAC units
- Emerson Network Power -- legacy Liebert PCW and CDW series
- Stulz -- CyberAir CDW configurations
See our Liebert CRAC spare parts and Vertiv cooling components page for replacement parts, and our CRAC unit maintenance hub for DX and CHW servicing options.
CDW CRAC servicing locations
We provide CDW CRAC servicing and Legionella compliance support from national service hubs across Australia:
Brisbane and QLD
Brisbane CBD, Tingalpa, Woolloongabba, Port of Brisbane, Gold Coast, Sunshine Coast, Ipswich, Toowoomba, Townsville, Cairns
CDW CRAC servicing and Legionella compliance support for Southeast Queensland data centres, commercial buildings, and government facilities.
Sydney and NSW
Sydney CBD, North Sydney, Parramatta, North Ryde, Macquarie Park, Western Sydney, Newcastle, Wollongong, Canberra (ACT)
CDW CRAC maintenance for Sydney data centre precincts, multi-tenanted commercial towers, and government infrastructure across NSW and ACT.
Melbourne and VIC
Melbourne CBD, Port Melbourne, South Melbourne, Docklands, Dandenong, Tullamarine, Geelong, Ballarat, regional Victoria
CDW CRAC servicing for Melbourne's data centre corridor, healthcare, financial services, and commercial buildings across Victoria.
Canberra and ACT
Canberra CBD, Civic, Fyshwick, Mitchell, Barton, Tuggeranong, Belconnen, Gungahlin, Queanbeyan (NSW)
CDW CRAC servicing for government data halls and departmental facilities across the ACT.
Perth, Adelaide, Darwin and NT
Perth CBD, Fremantle, Kalgoorlie, Pilbara; Adelaide CBD, Port Augusta; Darwin, Alice Springs; remote NT and WA sites
CDW CRAC servicing across remaining Australian states and territories. Our technicians travel from our national hubs for scheduled and emergency callouts.
Tasmania and Pacific Islands: we provide CDW CRAC maintenance for facilities in Hobart, regional Tasmania, and across the Pacific. Contact us to discuss scheduling and logistics.
CDW CRAC servicing FAQs
What is a CRAC unit?
A CRAC (computer room air conditioner) unit is a precision cooling system designed to maintain tight temperature and humidity control in server rooms and data halls. A CDW (condenser water) CRAC unit is a variant that rejects heat to a condenser water loop and rooftop cooling tower rather than to an outdoor refrigerant condenser.
What is included in CDW CRAC servicing?
CDW CRAC servicing includes condenser water loop inspection and flow testing, cooling coil cleaning, condenser water valve and actuator checks, water treatment verification, fan motor inspection, temperature and humidity sensor calibration, alarm system verification, and a written service report. For systems connected to a cooling tower, Legionella risk management compliance checks are also included.
How often should a CDW CRAC system be serviced?
Quarterly professional inspections are recommended for data centres, hospitals, and telecommunications facilities. Basic in-house checks including filter inspection and alarm verification should be performed monthly. An annual comprehensive service should include full electrical inspection, coil cleaning, deep diagnostics, and a Legionella risk assessment review.
What are the Legionella compliance requirements for CDW CRAC systems in Australia?
CDW systems with cooling towers are subject to Legionella risk management requirements under Australian WHS regulations and AS/NZS 3666. Operators must maintain a written Water Management Plan, conduct regular water quality testing, apply approved biocide treatment protocols, and maintain records for regulatory audit. Non-compliance creates serious WHS liability exposure.
What is the difference between CDW and DX CRAC servicing?
DX CRAC units use a sealed refrigerant circuit requiring ARC-licensed technicians for refrigerant handling. CDW CRAC units use a water loop instead of a refrigerant condenser, so they do not require refrigerant handling. CDW servicing focuses on water circuit condition, treatment compliance, heat exchanger performance, and cooling tower coordination.
Do you service CDW CRAC systems outside Brisbane, Sydney, and Melbourne?
Yes. We service CDW CRAC systems across all Australian states and territories including Perth, Adelaide, Darwin, Canberra, regional Queensland, WA, the NT, and remote and industrial sites. Our technicians travel from our national hubs for scheduled maintenance and emergency callouts.
What CDW CRAC brands do you service?
We service Vertiv Liebert CDW CRAC units (PDX and PCW series), Schneider Electric Uniflair CDW configurations, legacy Emerson Network Power systems, Stulz, and other major precision cooling brands with condenser water configurations.
Related services
- CRAC Unit Maintenance Services Australia
- DX CRAC Servicing Australia
- CHW CRAC Maintenance Australia
- CRAC Unit Installation and Commissioning
- Server Room Cooling Australia
- Liebert CRAC Spare Parts Australia
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Schedule CDW CRAC servicing Tell us your CDW CRAC brand, number of units, cooling tower configuration, and location. We will confirm availability and provide a fixed-price servicing quote including Legionella compliance coordination. Indigi Power and Cooling is an Indigenous and Veteran-owned business, Supply Nation and ICN Gateway registered. Contact Indigi Power and Cooling |
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