Unlike conventional AHUs that rely on chilled water from a central chiller, these units include:

• Built-in compressor(s) (scroll, screw, or inverter-driven)
• Direct expansion (DX) cooling coil
• Refrigerant circuit with refrigerant
• Air-cooled or water-cooled condenser
• Expansion valve (often electronic)

This eliminates the need for an external chiller, chilled water or pump sets.

Plug-and-Play Design

• Factory-tested refrigeration circuit
• Pre-wired electrical components
• Integrated controls
• Reduced on-site installation time
• Skid-mounted or rooftop-ready configuration

Ideal for projects where fast deployment is required.

Precise Temperature & Humidity Control

• Step or inverter-based compressor modulation
• Hot gas bypass (for low-load stability)
• Reheat options (electric, hot gas, or hydronic)
• Optional humidifiers

This makes them suitable for applications requiring tight environmental control.

Compact Footprint

Because cooling is built-in, there is no separate chiller room, no cooling water piping (air-cooled models), and reduced mechanical plant space. This is common in retrofits, space-constrained buildings, and modular constructions.

Energy Efficiency Features

• Variable speed compressors
• EC plug fans
• Heat recovery wheels or plates
• Economizer/free cooling mode
• Demand-controlled ventilation

Advanced Controls & BMS Integration

• Built-in PLC or microprocessor controller
• BACnet / Modbus compatibility
• Remote monitoring
• Fault diagnostics
• Alarm logging

Summary