CRAC Unit (Computer Room Air Conditioning) Maintenance Checklist
Keep server and comms rooms cool and stable — filter, humidity, and condensate checks, refrigerant or chilled-water verification, fan and alarm tests, and redundancy.
What is a crac unit maintenance checklist?
A crac unit (computer room air conditioning) maintenance checklist is a structured list of the 10 preventive maintenance tasks — covering visual, functional, cleaning, safety and record-keeping checks — that keep a crac unit (computer room air conditioning) running safely and reliably. It groups routine checks by frequency, from daily inspections to annual servicing, so FM teams and building engineers can plan and evidence preventive maintenance.
Core crac unit checks
- Inspect the humidifier (canister/electrode) and water treatment
- Verify supply/return air temperatures and humidity against setpoints
- Check and replace air filters
- Carry out F-Gas leak checks on DX units per the system charge
- Record temperatures, humidity, refrigerant/F-Gas, and alarm tests in the log
What is a crac unit (computer room air conditioning)?
A CRAC (computer room air conditioning) unit — or the chilled-water CRAH equivalent — provides close-control cooling and humidity management for server rooms, comms rooms, and data halls, where stable temperature and humidity are critical to equipment reliability. Units may be DX (with their own refrigerant circuit and external condenser) or chilled-water fed, often in N+1 redundant arrangements. Because the load runs 24/7 and a cooling failure can take IT offline in minutes, maintenance is rigorous: filters, humidity control, condensate management, refrigerant or chilled-water performance, fan and EC motor health, alarms, and proving the redundancy actually works.
This checklist is one of 34 in our HVAC maintenance checklists, covering air handling units, fan coils, chillers, VRF, ductwork and extract systems — filters, coils, refrigerant and damper checks.
Typical CRAC Unit maintenance checklist
A practical starting point for planned preventive maintenance. Always refer to the manufacturer's O&M manual and site-specific requirements.
Visual Checks
- Inspect the humidifier (canister/electrode) and water treatment
Functional Checks
- Verify supply/return air temperatures and humidity against setpoints
- Check refrigerant circuit performance / chilled-water flow and ΔT
- Test fan / EC motor operation, current, and any speed control
- Confirm alarms (high temp, humidity, airflow, condensate) report correctly
- Prove N+1 redundancy — confirm standby unit starts on duty failure/rotation
Cleaning & Housekeeping
- Check and replace air filters — restricted airflow quickly raises rack temperatures
- Inspect and clear the condensate drain, pump, and humidifier system
Safety Checks
- Carry out F-Gas leak checks on DX units per the system charge
Record Keeping
- Record temperatures, humidity, refrigerant/F-Gas, and alarm tests in the log
Download the free CRAC Unit maintenance checklist PDF
Get all 10 tasks as a printable PDF — free, no signup needed. Keep a copy in the plant room, attach it to work orders, or share it with your maintenance contractor.
Typical maintenance frequency
Suggested intervals for crac unit (computer room air conditioning) maintenance. Actual frequencies should follow manufacturer guidance and site-specific risk assessments.
Monthly
- •Check filters and airflow
- •Verify temp/humidity setpoints
- •Inspect condensate and alarms
Quarterly
- •Refrigerant/chilled-water performance check
- •Humidifier service
- •Fan and EC motor check
- •Redundancy/changeover test
Annually
- •Full service and F-Gas leak check
- •Coil and condenser clean
- •Control and alarm verification
- •Update F-Gas records
Common faults and issues
Issues to be aware of when maintaining crac unit (computer room air conditioning) equipment.
Safety and compliance notes
Key safety considerations for crac unit (computer room air conditioning) maintenance. This is general guidance only — always follow OEM instructions, statutory requirements, and your organisation's safe systems of work.
Reference standards and frameworks
- United Kingdom
- SFG20, CIBSE Guide M, and the UK F-Gas Regulations for refrigerant plant
- North America
- ASHRAE/ACCA Standard 180, plus EPA Section 608 refrigerant handling rules
Frameworks commonly referenced when planning crac unit maintenance programmes. Always confirm the requirements that apply to your site and jurisdiction.
Managing CRAC Unit documentation with PM Assist
PM Assist helps FM and building operations teams search their O&M manuals and building drawings in seconds. Upload your crac unit (computer room air conditioning) documentation and ask questions like “What temperature and humidity setpoints does the room run?” or “Is the cooling N+1 redundant?” — and get source-cited answers instantly.
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Related maintenance checklists
Further reading on crac unit maintenance
Compliance topics for crac unit maintenance
Frequently asked questions
How often should a CRAC unit be serviced?
Why is humidity control important in a server room?
What does N+1 redundancy mean for CRAC maintenance?
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