Vertiv Liebert PEX4 series 15-120kw Full Frequency Conversion Precision Air Conditioner for Data Cen. Model PEX4.

Product Overview

The VERTIV PEX4 series delivers 15-120kW of precision cooling for mission-critical IT and telecom environments where temperature stability directly affects equipment uptime and operating cost.

Why Precision Cooling Matters in Real Deployments

Consider a 200 m² edge data center processing payment authorization for an entire city. If the room drifts to 28°C, server fans ramp up, MTBF drops by 40%, and PUE climbs above 1.6 — pushing electricity costs 30% above projection. The VERTIV PEX4 prevents this cascade. It is engineered for:

• Edge and mid-size data centers (50–500 m²) requiring close-coupled cooling at rack level
• Telecom switching rooms where 24/7 operation is mandated by service-level agreements
• Medical imaging rooms (CT, MRI control rooms) where temperature stability protects calibration accuracy
• Industrial control cabinets in semiconductor fabs and pharmaceutical clean rooms

What Distinguishes the VERTIV PEX4 from Generic HVAC Systems

Most comfort air conditioners claim to handle server-room heat loads, but only precision cooling units deliver the control tolerances that IT equipment actually requires:

1. Tight temperature control (typically ±1°C around setpoint, vs ±3°C for comfort HVAC) — critical for ASHRAE Class A1 environments
2. Integrated humidity management (active dehumidification and humidification to maintain 40–55% RH) — prevents static discharge and corrosion
3. Hot-aisle / cold-aisle compatible airflow (front intake, rear exhaust at controlled CFM) — eliminates bypass air that wastes cooling capacity
4. Year-round operation without free-cooling freeze risk (low-ambient kits for cold climates and economizer integration)

Buyer’s Question: What Capacity Do I Need?

General sizing for a precision cooling unit:

• 1 rack (5 kW load) → choose a 7–10 kW unit (1.4× headroom for redundancy)
• 4 racks (20 kW load) → choose a 25–30 kW unit
• 10 racks (50 kW load) → choose a 60–70 kW unit, plan for N+1 redundancy with two units

Add 20–30% headroom for future rack density growth. If your racks include GPU servers (AI workloads), plan for 2× inrush heat-load.

Cooling Architecture Options

The VERTIV PEX4 family supports three architectures:

• Row-level (in-row) cooling — placed between server racks, ideal for hot-aisle/cold-aisle containment
• Per-room (CRAC) cooling — perimeter placement with raised-floor or overhead duct distribution
• Rack-mounted (in-rack) cooling — for high-density single racks (15–30 kW per rack)

Integration with Building Management

Standard RS-485 / Modbus connectivity integrates directly with BMS platforms. SNMP option enables remote monitoring via DCIM tools. The VERTIV PEX4 supports group control for N+1 redundant operation.

Procurement Considerations

BS Comtec is an authorized channel partner for VERTIV precision cooling systems. We supply factory-sealed units with full warranty. For load profile analysis, capacity sizing, and configuration support, contact our sales engineering team.

Contact us for specifications and quotation.

Frequently Asked Questions

How do I choose the right Liebert PEX4 capacity?

Capacity selection starts from your room’s heat load (IT equipment, lighting, envelope), airflow arrangement and redundancy targets. Send your room details to BS Comtec for a cooling proposal.

Is Liebert PEX4 suitable for my existing room layout?

Suitability depends on floor plan, airflow direction and installation space. Our team can review your layout and recommend upflow, downflow or in-row variants accordingly.

Does BS Comtec deliver Liebert PEX4 overseas?

Yes, BS Comtec arranges international shipping with export-standard packing. Transit time and freight cost depend on destination and project schedule — request a quote for specifics.

What after-sales support is available for Liebert PEX4?

Warranty follows the manufacturer’s policy, and BS Comtec assists with spare parts inquiries and service coordination. Contact us with your installation details for support options.

In which environments is Liebert PEX4 typically installed?

It is typically installed in data centers, telecom rooms, laboratories and other facilities requiring continuous, precise climate control for sensitive equipment.