Data Center Cooling Systems Electrical Installation
Southern Electrical Services provides complete electrical installation for all data center cooling systems — from chilled water plants and CRAC/CRAH units to direct liquid cooling infrastructure for high-density AI and GPU compute racks across Texas.
What Electrical Work Is Required for Data Center Cooling Systems?
Data center cooling systems consume 30–40% of a facility's total electrical load. Each cooling component — chillers, cooling towers, pumps, CRAC/CRAH units, and liquid cooling distribution units — requires dedicated power feeds, properly sized overcurrent protection, and control wiring. For modern AI facilities running high-density GPU racks, liquid cooling electrical infrastructure adds significant complexity. Southern Electrical Services installs and commissions all cooling system electrical as prime contractor throughout Texas.
Cooling System Electrical Services
Chilled Water Plant Electrical
Complete power and controls wiring for chilled water plants — including centrifugal and screw chillers (typically 200–2,000 tons each), cooling towers, condenser water and chilled water pumps, and associated variable frequency drives (VFDs). A 10MW data center may have 3,000–4,000 tons of chilled water capacity requiring 1–2MW of cooling electrical load.
CRAC & CRAH Unit Power Feeds
Dedicated 208V or 480V 3-phase power feeds to Computer Room Air Conditioning (CRAC) and Computer Room Air Handling (CRAH) units. Each unit typically draws 5–30kW depending on capacity. We install feeds, disconnects, and controls wiring per manufacturer requirements and NEC Article 440.
In-Row Cooling Electrical
Power feeds and controls for in-row cooling units positioned between server racks to manage localized heat from high-density rows. As rack densities climb above 20kW, in-row cooling supplements perimeter cooling units. We install power feeds for units from Vertiv, APC, Emerson, and all major manufacturers.
Rear-Door Heat Exchanger (RDHx) Wiring
Piping and controls wiring for rear-door heat exchangers that mount directly to server rack doors and use chilled water to capture heat at the source. Controls wiring includes leak detection, flow sensors, and integration with building management systems (BMS).
Direct Liquid Cooling (DLC) Infrastructure
Electrical infrastructure for direct liquid cooling systems serving AI and HPC racks — including cooling distribution unit (CDU) power feeds (typically 208V or 480V, 30–100A), leak detection system wiring, and BMS integration. DLC is increasingly required for racks above 50kW as air cooling reaches its density limits.
Cooling Tower & Heat Rejection Electrical
Power feeds, VFDs, and control wiring for cooling tower fans, basin heaters, and makeup water systems. Cooling tower fans on a 10MW facility may total 500–800kW of connected load. We install variable speed drives to reduce energy consumption at partial loads.
Building Management System (BMS) Integration
Control wiring and integration of all cooling system components into the facility BMS or DCIM platform. Includes sensor installation (temperature, humidity, pressure, flow), control panel wiring, and communication network terminations.
Frequently Asked Questions
How much electrical load do data center cooling systems require?
Data center cooling systems typically consume 30–40% of total facility electrical load. For a 10MW IT load facility, expect 3–5MW of cooling electrical load including chillers, cooling towers, pumps, CRAC/CRAH units, and controls. The Power Usage Effectiveness (PUE) ratio — total facility power divided by IT load power — reflects cooling efficiency, with best-in-class facilities achieving PUE of 1.2–1.3.
What is direct liquid cooling and why is it used in AI data centers?
Direct liquid cooling (DLC) routes chilled water or dielectric fluid directly to heat-generating components — GPU chips, CPUs, memory — either through cold plates (direct-to-chip cooling) or by submerging equipment in liquid (immersion cooling). AI GPU racks from NVIDIA, AMD, and others now exceed 100kW per rack, beyond the capacity of air cooling. DLC removes heat more efficiently and allows far higher rack densities. Southern Electrical Services installs the CDU power feeds, leak detection systems, and BMS integration required for DLC deployments.
What is the difference between CRAC and CRAH units?
CRAC (Computer Room Air Conditioning) units are self-contained cooling units with their own refrigeration compressors — they produce cold air independently and exhaust heat via condenser coils. CRAH (Computer Room Air Handling) units circulate chilled water from a central chilled water plant and do not have built-in refrigeration. CRAH units are more common in large data centers because they are more energy efficient at scale. Both require dedicated electrical power feeds installed by a licensed electrician.
Do cooling systems require variable frequency drives (VFDs)?
Yes. Modern data center cooling systems use VFDs on chiller compressors, cooling tower fans, and chilled/condenser water pumps to vary speed with load. VFDs reduce energy consumption significantly — fan laws mean a 20% reduction in speed cuts power by nearly 50%. Southern Electrical Services installs and programs VFDs as part of all cooling system electrical work.
Who is responsible for cooling system electrical in a data center project?
The electrical contractor is responsible for all power feeds, overcurrent protection, disconnects, and controls wiring for cooling equipment. The mechanical contractor installs the cooling equipment itself. As prime electrical contractor, Southern Electrical Services coordinates directly with mechanical contractors and equipment manufacturers to ensure correct installation.
Cooling Systems We Work On
- Centrifugal & screw chillers
- Cooling towers
- Chilled water pumps
- CRAC / CRAH units
- In-row cooling units
- Rear-door heat exchangers
- Direct liquid cooling (DLC)
- Cooling distribution units (CDUs)
- Immersion cooling systems
- Building management systems
Cooling System Electrical for Your Texas Data Center
From chilled water plants to direct liquid cooling for AI racks — Southern Electrical Services installs it all as prime electrical contractor throughout Texas.