Description
HRE 0250 Altec AIR Heat Regenerative Desiccant Dryer
The Altec AIR HRE 0250 is a dual tower heat regenerative desiccant air dryer engineered to deliver consistently dry compressed air for moisture-sensitive industrial systems. By removing water vapor through adsorption, it helps reduce corrosion, freezing, and contamination that can damage downstream tools, valves, instrumentation, and production equipment.
The HRE Series alternates between two desiccant towers: one tower dries compressed air while the other regenerates using heated purge air for efficient desiccant reactivation. Designed to meet ISO 8573.1 Class 2 air quality, the HRE is built to maintain a -40°F pressure dew point under rated conditions and includes factory-installed filtration for cleaner inlet air and longer desiccant life.
Key Features
- Dual tower heat regenerative design: Continuous drying with automatic heated regeneration.
- -40°F pressure dew point: Designed to meet ISO 8573.1 Class 2 outlet air quality under rated conditions.
- Factory-installed filtration: Pre & after-filters with differential pressure gauges and a pre-filter timer drain.
- Pro-Logic controller: ETL listed controller with a NEMA 4X enclosure for dependable operation and monitoring.
- Industrial construction: ASME/CRN pressure vessels and welded frame base for long service life.
Specifications
| Model | HRE-0250-4 |
|---|---|
| Dryer Type | Heat Regenerative Desiccant Dryer (Dual Tower) |
| Rated Outlet Dew Point | ISO 8573.1 Class 2, -40°F Pressure Dew Point (rated conditions) |
| Flow Capacity | 250 SCFM @ 100 PSIG |
| Purge Flow | 19 SCFM |
| Inlet / Outlet Connection | 1-1/2" NPT |
| Operating Voltage | 460 VAC / 3 Phase / 60 Hz |
| Heater | 3 kW |
| Max Working Pressure | 150 PSIG (standard) |
| Max Inlet Temperature | 120°F |
| Dimensions (in) | W 31 × D 38 × H 91 |
| Weight | 1,018 lb |
| EcoTronic Demand Control | Not included (available option) |
| Bypass / Dual Filter Package | None |
| Environment Protection | Standard (no insulation/low-ambient kit) |
Benefits
- Protects equipment and processes: Helps prevent moisture-driven corrosion, freezing, and contamination.
- Supports air quality targets: -40°F pressure dew point performance for moisture-sensitive applications.
- Service-friendly package: Integrated filters and monitoring support easier maintenance planning.
- Improves uptime: Stable dry air helps reduce unplanned downtime and product quality issues.
Installation & Application Notes
- Install downstream of an aftercooler and moisture separator for best dryer performance.
- Maintain upstream filtration and drains to protect the desiccant from oil and particulate contamination.
- Verify system demand under actual conditions does not exceed the rated 250 SCFM capacity.
- Allow service clearance for filter service, valve access, and routine preventive maintenance.
The Altec AIR HRE-0250-4 is a strong fit for plants that need consistent -40°F dew point compressed air, rugged heat regenerative drying performance, and a packaged design with factory-installed filtration.
Frequently Asked Questions
Altec AIR HRE-0250-4 Heat Regenerative Desiccant Dryer
▶️ Question: What applications are best suited for the HRE Series?
Answer: HRE heat regenerative dryers are commonly used for instrumentation, pneumatics, packaging, manufacturing, process air, and plant systems where moisture can cause corrosion, freezing, sticking valves, or product quality issues.
▶️ Question: What does a -40°F pressure dew point mean?
Answer: It indicates very dry compressed air. A lower dew point means less water vapor remains in the air, helping prevent condensation inside piping and equipment—especially in cooler environments or critical processes.
▶️ Question: How does heat regenerative desiccant drying work?
Answer: The dryer uses two towers filled with desiccant. One tower dries air while the other regenerates by flowing heated purge air through the desiccant to remove moisture, then cooling and returning to service in an automatic cycle.
▶️ Question: What is EcoTronic demand control?
Answer: EcoTronic (available as an option) uses dew point-based logic to optimize purge usage under lighter loads, helping reduce energy and purge consumption while maintaining dry air performance.
▶️ Question: How do I confirm the dryer is properly sized?
Answer: Match your peak system demand (at actual pressure and inlet temperature) to the dryer’s rated capacity (250 SCFM @ 100 PSIG). If conditions vary, consult correction factors or select the next larger HRE model to maintain dew point performance.
