Built for technicians who need practical troubleshooting skills, not design theory. This course covers refrigeration cycle fundamentals, psychrometrics basics, and hands-on CRAC/CRAH diagnostics — the skills you use during an actual cooling failure, not just a scheduled inspection.
You'll work through common failure modes, airflow measurement techniques, and a preventive maintenance schedule you can apply immediately, plus emergency troubleshooting procedures for when cooling capacity drops unexpectedly.
What You'll Learn
- Diagnose common CRAC/CRAH failure modes quickly and accurately
- Apply refrigeration cycle fundamentals to real troubleshooting scenarios
- Measure airflow correctly to identify cooling distribution problems
- Build a preventive maintenance schedule that reduces emergency callouts
Course Modules
Refrigeration Cycle Fundamentals
The refrigeration cycle basics behind every CRAC/CRAH diagnostic.
CRAC/CRAH Diagnostics
Reading unit diagnostics to isolate a failure fast.
Common Failures & Troubleshooting
The failure modes technicians see most often, and how to fix them.
Maintenance Best Practices
A preventive schedule that catches problems before they're emergencies.
Why This Matters in a Data Center
When a cooling unit fails in a data hall, temperatures can rise quickly, especially in high-density rows. The technician on site needs to find the cause fast: a failed compressor, a refrigerant problem, a stuck valve, a bad sensor or a controls issue. Guessing and swapping parts wastes time the room does not have.
Effective troubleshooting starts with the refrigeration cycle and the numbers that describe it, such as pressures, superheat and subcooling, plus enough psychrometrics to understand dew point and humidity. It also means knowing the difference between direct-expansion CRAC units and chilled-water CRAH units. This course covers refrigeration cycle fundamentals, CRAC/CRAH diagnostics, common failures and maintenance practices that prevent repeat problems.
Safety Scope & Limits
Applicable standards and regulations
- EPA Clean Air Act Section 608 refrigerant management rules (40 CFR Part 82, Subpart F)
- OSHA 29 CFR 1910.147 (control of hazardous energy)
What this course does
- Teaches a structured approach to diagnosing common CRAC/CRAH and cooling failures.
What it does not do
- Does not provide EPA Section 608 technician certification, which federal rules require for work that could release refrigerant.
- Does not replace manufacturer training or your site's lockout/tagout procedures.
An online course alone does not make anyone qualified for hazardous work. Under OSHA rules, the employer decides who is qualified, based on training plus demonstrated skill on the specific equipment and tasks at your site. Referencing a standard does not mean the organization that publishes it has reviewed or endorsed this course.
Who This Course Is For
Audience: HVAC technicians working on data center cooling equipment.
Course Details
Frequently Asked Questions
What are superheat and subcooling?
Superheat is how much the refrigerant vapor temperature is above its boiling point at the evaporator outlet. Subcooling is how much the liquid is below its condensing temperature at the condenser outlet. Together they help diagnose charge problems, restrictions and valve issues.
Why does humidity matter in a data center?
High humidity can cause condensation and corrosion, while very low humidity increases static discharge risk. ASHRAE's thermal guidelines give recommended ranges based on dew point and relative humidity, and cooling units must be tuned to stay within them.
Is this a design course?
No. It is built for technicians who need practical diagnostic skills. For system design and optimization, see Cooling Systems Design & Optimization.