Service / Precision Cooling Maintenance
CRAC Unit Maintenance ServicesAustralia-Wide
Direct answer
CRAC units (computer room air conditioners) require specialist preventative maintenance to hold cooling performance, prevent failures, and protect the IT infrastructure they serve.
Indigi Power and Cooling provides scheduled CRAC unit maintenance, fault detection, and emergency callout for DX, CDW, and CHW precision cooling systems across Australia, serviced by ARC-licensed refrigeration technicians and critical power engineers. Call 1800 046 344.
Why it matters
Capacity does not failit drifts
A CRAC unit running without regular maintenance loses efficiency progressively: fouled coils, degraded filters, and worn components reduce airflow and heat rejection capacity.
In Australian conditions, where summer ambient temperatures regularly exceed 35 degrees Celsius in Queensland, Western Australia, and the Northern Territory, the margin between a maintained system and an unmaintained one can be the difference between a stable server room and an unplanned outage.
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 Electric Uniflair, Emerson, and all major precision cooling brands from our Brisbane, Sydney, and Melbourne hubs.
Definition
What does CRAC stand for,and what is a CRAC unit?
CRAC stands for computer room air conditioner. A CRAC unit is a precision cooling system engineered specifically for data centres, server rooms, telecommunications rooms, and other critical IT environments.
It works by drawing warm room air across a cooling coil, removing heat and excess humidity, and returning conditioned air to the space, typically through a raised floor or ducted supply. Unlike standard HVAC systems designed for human comfort, a CRAC unit is built to:
- Run continuously 24 hours a day, 365 days a year without planned shutdown
- Maintain tight temperature tolerances, typically 18 to 27 degrees Celsius with plus or minus 1 degree precision, in line with ASHRAE TC 9.9
- Actively control humidity to prevent condensation on switchgear and corrosion of sensitive components
- Handle the high, concentrated dry heat loads produced by servers, networking equipment, and power infrastructure
- Integrate with BMS and SCADA systems for remote monitoring and alarm management
Because CRAC units run continuously and serve mission-critical environments, they require specialist maintenance, not standard air conditioning servicing. The consequences of a CRAC failure are immediate: IT equipment can overheat and shut down within minutes.
System types
CRAC systemswe maintain
Different facilities use different CRAC cooling architectures. Each requires a distinct maintenance approach, specific compliance requirements, and technicians with the appropriate licensing for the system type.
DX CRAC systems, direct expansion cooling
DX units use a refrigerant circuit similar in principle to a standard air conditioner but engineered for precision and continuous operation. The refrigerant absorbs heat from the server room air at the evaporator coil and rejects it via an external condenser unit. Refrigerant handling, leak testing, and system recharging must be performed by ARC-licensed refrigeration technicians under Australian regulations. Unauthorised refrigerant work is a compliance violation and a safety risk. DX systems are the most common CRAC type in Australian server rooms and comms rooms, and the most maintenance-intensive.
CDW CRAC systems, condenser water cooling
CDW systems use a water loop, typically connected to a rooftop cooling tower, to reject heat. The unit exchanges heat with the condenser water loop rather than using an outdoor refrigerant condenser. The water circuit requires regular treatment checks to control biological growth and scale build-up that reduces heat exchange efficiency and can cause corrosion. The cooling tower itself is a separate maintenance item requiring Legionella risk management compliance. CDW systems are common in larger data centres and multi-tenant buildings.
CHW CRAC systems, chilled water cooling
CHW units receive chilled water from a central building chiller plant rather than generating their own refrigeration cycle. Maintenance includes checking supply and return temperatures, water flow rates, coil condition, isolation and control valve operation, and verifying the unit is receiving chilled water within design parameters. CHW systems are also sensitive to water quality and corrosion inhibitor levels, and are common in large enterprise data centres and hospital plant rooms.
From site
Inside a precision cooling unit with the panel off. Almost none of what determines the unit's condition is visible with the covers on, which is why walking past a running CRAC tells you nothing useful about it.
The components that consume a service visit are the ones that wear: fans and bearings, contactors, capacitors, the filter path and the coil face. None of them announce themselves before they fail.
Scope of works
What is includedin a CRAC maintenance service
A standard CRAC unit maintenance inspection by Indigi Power and Cooling covers the following across all system types, with additional system-specific checks for DX, CDW, and CHW configurations.
| Maintenance item | DX | CDW | CHW |
|---|---|---|---|
| Filter inspection and replacement | Yes | Yes | Yes |
| Evaporator coil inspection and cleaning | Yes | Yes | Yes |
| Fan motor inspection and vibration check | Yes | Yes | Yes |
| Electrical component testing (contactors, capacitors) | Yes | Yes | Yes |
| Temperature and humidity sensor calibration | Yes | Yes | Yes |
| Alarm and control system verification | Yes | Yes | Yes |
| Refrigerant pressure and leak check (ARC licensed) | Yes | N/A | N/A |
| Condenser coil cleaning (outdoor unit) | Yes | N/A | N/A |
| Water circuit inspection and treatment check | N/A | Yes | Yes |
| Written service report with findings and recommendations | Yes | Yes | Yes |
Frequency
How often should a CRAC unitbe serviced?
Twice per year for standard environments. Quarterly servicing for mission-critical environments including data centres, hospitals, and telecommunications infrastructure.
| Environment | Recommended frequency | Reason |
|---|---|---|
| Standard server room or comms room | Twice per year | Minimum for filter and coil condition; seasonal preparation before Australian summer |
| Data centre or colocation | Quarterly | High heat density and continuous operation; any degradation impacts SLA performance |
| Hospital or healthcare facility | Quarterly | Clinical systems depend on continuous cooling; Legionella compliance applies to water systems |
| Telecommunications infrastructure | Quarterly | Regulatory uptime requirements; remote sites may have reduced monitoring |
| High ambient sites (QLD, WA, NT) | Quarterly, pre-summer essential | Outdoor ambient above 35 degrees Celsius reduces condenser capacity; a pre-summer service is critical |
Platforms
CRAC brandswe service
Our technicians are trained on all major precision cooling platforms deployed in Australian data centres and server rooms.
We also supply genuine replacement parts and components for Vertiv Liebert and Emerson precision cooling systems. See our Liebert CRAC spare parts and Vertiv cooling components page. Our maintenance services complement our CRAC supply and installation offering. If you are considering new or replacement precision cooling, see our server room cooling, electrical switchroom cooling, and CRAC installation and commissioning pages.
Coverage
CRAC maintenanceacross Australia
We provide scheduled preventative maintenance and emergency callout services from national service hubs.
Brisbane and QLD
Brisbane CBD, Tingalpa, Woolloongabba, Eight Mile Plains, Rocklea, Port of Brisbane, Gold Coast, Sunshine Coast, Ipswich, Toowoomba, Townsville, Cairns
Our Brisbane hub services the majority of Southeast Queensland data centres, server rooms and government facilities. Pre-summer CRAC maintenance is strongly recommended for all Queensland sites before October.
Sydney and NSW
Sydney CBD, North Sydney, Parramatta, North Ryde, Macquarie Park, Western Sydney, Ultimo, Alexandria, Newcastle, Wollongong
CRAC maintenance for Sydney data centre precincts, enterprise server rooms, financial services and government infrastructure across NSW.
Melbourne and VIC
Melbourne CBD, Port Melbourne, South Melbourne, Docklands, Dandenong, Tullamarine, Geelong, Ballarat, regional Victoria
CRAC maintenance for Melbourne's data centre corridor from Port Melbourne to Tullamarine, plus healthcare, manufacturing and financial services across Victoria.
Canberra and ACT
Canberra CBD, Civic, Fyshwick, Mitchell, Barton, Tuggeranong, Belconnen, Gungahlin, Queanbeyan
CRAC maintenance for government data halls and departmental server rooms across the ACT, aligned with Commonwealth procurement requirements.
Perth and WA
Perth CBD, Fremantle, Malaga, Kewdale, Kalgoorlie, Pilbara, Kimberley, remote WA mine sites
CRAC maintenance for mining, resources, government and commercial facilities across WA. Pre-summer servicing is critical for Pilbara and Kimberley sites where outdoor ambient regularly exceeds 45 degrees Celsius.
Adelaide, SA and Darwin, NT
Adelaide CBD, Port Adelaide, Salisbury, Edinburgh, Whyalla, Olympic Dam; Darwin, Palmerston, Katherine, Alice Springs
Defence, government and resources facility CRAC maintenance across SA and the NT. NT sites face the most demanding cooling conditions in Australia, high heat and high humidity year-round.
Remote and regional
Tasmaniaand the Pacific Islands
We provide CRAC maintenance for facilities in Hobart, regional Tasmania, Papua New Guinea, Fiji, and other Pacific Island nations.
Visits are scheduled in planned blocks so mobilisation cost stays off your quote rather than being passed through per attendance, and cooling and UPS work can be combined into a single trip.
Contact us to discuss scheduling →Questions
CRAC unit maintenancefrequently asked
What is a CRAC unit?
A CRAC unit (computer room air conditioner) is a precision cooling system designed specifically for data centres, server rooms, telecommunications rooms, and other critical IT environments. Unlike standard HVAC, CRAC units run continuously, maintain tight temperature and humidity tolerances, and manage the concentrated dry heat loads produced by server and networking equipment.
What does CRAC stand for?
CRAC stands for computer room air conditioner. It refers to a precision air conditioning unit built for continuous operation in IT environments, distinct from a CRAH (computer room air handler), which uses chilled water without its own refrigeration cycle.
How often does a CRAC unit need maintenance?
At minimum twice per year for standard server rooms and comms rooms. Quarterly servicing is recommended for data centres, hospitals, and telecommunications infrastructure, and for any site in Queensland, Western Australia, or the Northern Territory where outdoor ambient temperatures regularly exceed 35 degrees Celsius.
What is the difference between DX, CDW, and CHW CRAC maintenance?
DX (direct expansion) units use a refrigerant circuit requiring ARC-licensed technicians for refrigerant handling. CDW (condenser water) units use a water loop requiring water treatment compliance and Legionella risk management. CHW (chilled water) units receive chilled water from a central plant and require water-side inspection and valve testing. Each type has specific regulatory and compliance requirements separate from standard HVAC servicing.
What happens if a CRAC unit is not maintained?
An unmaintained CRAC unit progressively loses cooling efficiency through fouled coils, clogged filters, and degraded components. This leads to reduced airflow, increased energy consumption, and ultimately cooling system failure. A cooling failure in a server room can cause IT equipment to overheat and shut down within minutes, resulting in unplanned outages, hardware damage, and data loss.
Do you service Vertiv Liebert and Schneider Uniflair CRAC units?
Yes. We service Vertiv Liebert, Schneider Electric Uniflair, legacy Emerson, Stulz, and other major precision cooling brands. Our technicians are trained on the specific maintenance requirements, fault codes, and spare parts for these systems.
Can you provide emergency CRAC unit repair?
Yes. We provide emergency callout and breakdown response for CRAC unit failures across Brisbane, Sydney, and Melbourne, and travel to regional and remote sites for critical facilities. Contact us on 1800 046 344 for emergency cooling support.
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Next step
Schedule CRACunit maintenance
Tell us your CRAC unit type (DX, CDW, or CHW), brand, number of units, and location. We will confirm availability and provide a fixed-price maintenance quote.
Indigi Power and Cooling is an Indigenous and Veteran-owned business, Supply Nation and ICN Gateway registered for government, defence, and enterprise procurement. Head office 10/240 New Cleveland Road, Tingalpa QLD 4173. Call 1800 046 344.
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Reliable Power & Cooling Solutions from Indigi Power & Cooling Expert supply, installation, and contracting services for critical infrastructure across Australia.