Description
Altec AIR HR7 Heatless Regenerative Desiccant Dryer
The Altec AIR HR7 is a compact, heatless regenerative twin tower desiccant dryer designed to deliver ultra-dry compressed air for smaller horsepower systems and point-of-use installations. Built for moisture-sensitive applications, it helps reduce corrosion, freezing, and contamination in downstream tools, pneumatic controls, and equipment.
The HR7 alternates between two towers: one tower dries compressed air through a desiccant bed while the other tower regenerates automatically using a controlled purge of dry air. This continuous adsorption/regeneration cycle supports reliable drying performance without external heaters and can be configured for -40°F / -40°C PDP or -100°F / -73°C PDP (configured).
Key Features
- Heatless twin tower design: Adsorption drying with automatic tower regeneration.
- Ultra-dry dew point options: Configurable for -40°F / -40°C PDP or -100°F / -73°C PDP (configured).
- Rated capacity: 50 SCFM @ 100 PSIG inlet conditions.
- Industrial operating limits: Up to 150 PSI maximum pressure and 120°F (49°C) maximum inlet temperature.
- Instrumentation options: Moisture indicator and tower pressure gauges are available as configuration options.
- Electrical configuration: 120 VAC / 1 Phase / 60 Hz operation.
Specifications
| Model | HR7-11 |
|---|---|
| Dryer Type | Heatless Regenerative Desiccant Dryer (Twin Tower) |
| Flow Capacity | 50 SCFM @ 100 PSIG |
| Max Working Pressure | 150 PSI |
| Max Inlet Temperature | 120°F (49°C) |
| Rated Dew Point | -40°F / -40°C PDP or -100°F / -73°C PDP (configured) |
| End Connection | 1/2" NPT |
| Operating Voltage | 120 VAC / 1 Phase / 60 Hz |
| Recommended Filter Kit | AD11-HR57 |
| Included Options | None (options available) |
Benefits
- Protects equipment and piping: Helps reduce moisture-driven corrosion and premature wear.
- Improves reliability: Minimizes condensation that can cause downtime or quality issues.
- Heatless operation: No external heaters required; automatic regeneration using purge air.
- Right-sized capacity: 50 SCFM rating supports smaller compressed air systems needing dependable dry air.
Installation & Application Notes
- Install downstream of an aftercooler and moisture separator for best dryer performance.
- Maintain proper upstream filtration to protect the desiccant from oil aerosols and particulate contamination (recommended filter kit: AD11-HR57).
- Confirm system airflow demand does not exceed 50 SCFM @ 100 PSIG to maintain rated drying performance.
- Allow service clearance for routine inspection, valve service, and desiccant maintenance.
The Altec AIR HR7 is a strong fit for compressed air systems that require dependable moisture removal and ultra-dry pressure dew point air in a compact, heatless twin tower desiccant dryer rated for up to 50 SCFM.
Frequently Asked Questions
Altec AIR HR7 Heatless Regenerative Desiccant Dryer
▶️ Question: What applications are best suited for the HR7?
Answer: The HR7 is well-suited for moisture-sensitive compressed air uses such as pneumatic controls, instrumentation, automation equipment, machine tools, and processes where moisture can cause corrosion, freezing, or product quality issues.
▶️ Question: What does “pressure dew point” mean in practical terms?
Answer: Pressure dew point (PDP) indicates how much moisture remains in compressed air after drying. Lower PDP air (such as -40°F or -100°F) helps prevent condensation in piping and equipment—especially in cooler environments or where air quality is critical.
▶️ Question: Does the HR7 use compressed air for regeneration?
Answer: Yes. Heatless regenerative desiccant dryers regenerate the off-line tower using a controlled purge of dry compressed air, allowing the dryer to continuously alternate towers and maintain dry air delivery without external heaters.
▶️ Question: Why is upstream filtration important, and what filter kit is recommended?
Answer: Proper filtration reduces oil aerosols and particulates that can foul the desiccant bed and valves, helping maintain stable dew point performance and extending service life. For this model family, the recommended filter kit is AD11-HR57.
▶️ Question: How do I confirm the HR7 is properly sized?
Answer: Match your system demand to the dryer’s rated capacity (50 SCFM @ 100 PSIG), verify operating pressure stays within limits (up to 150 PSI), and select the dew point option needed (-40°F or -100°F). If demand can exceed the rating or expansion is expected, select the next larger HR model to maintain drying performance.
