Tsunami Pure-7 – Pure Series Regenerative Air Dryer, 7.5 HP / 25 CFM, 120V
25 CFM Regenerative Desiccant Air Dryer | For 7.5 HP Compressors | Dew Points Down to -80°F | Available with Float or Moisture Minder® Pneumatic Drains
Short Product Description
The Tsunami Pure-7 Regenerative Air Dryer delivers up to 25 CFM of clean, extremely dry compressed air for approximately 7.5 HP compressor systems. Featuring integrated two-stage pre-filtration, twin regenerative desiccant towers, 120V operation, and dew points down to -80°F , the Pure-7 is ideal for automotive finishing, paint and coating applications, manufacturing, woodworking, pneumatic equipment, and other moisture-sensitive compressed air applications. Choose PN 21999-1140 with float drains or PN 21999-1140-MM with Moisture Minder® pneumatic drains .
Full Product Description
The Tsunami Pure-7 Pure Series Regenerative Air Dryer is a compact, wall-mounted compressed air treatment system designed to provide exceptionally clean, dry compressed air for demanding shop, production, and point-of-use applications.
Rated for up to 25 CFM and sized for approximately 7.5 HP compressor systems , the Pure-7 combines Tsunami's integrated two-stage pre-filtration system with twin regenerative desiccant towers to remove liquid water, compressor oil, aerosols, particulates, and water vapor from the compressed air stream.
The Pure-7 can provide dew points down to -80°F and relative humidity levels down to approximately 0.01% RH , making it an excellent choice for applications where moisture can negatively affect paint quality, pneumatic equipment, manufacturing processes, or finished products.
Before compressed air enters the regenerative dryer, it passes through two stages of filtration:
- First Stage Water Separator: Removes liquid water and filters particulate down to 10 micron.
- Second Stage Oil Coalescing Filter: Removes bulk oils and aerosols while filtering particulate down to 0.01 micron.
After pre-filtration, the compressed air enters the twin regenerative desiccant towers. One tower actively removes water vapor while the second tower regenerates using a small amount of previously dried compressed air.
Approximately every two minutes, the dryer automatically switches towers. This allows one molecular sieve desiccant bed to regenerate while the other remains in service, providing a continuous supply of exceptionally dry compressed air.
The Pure-7 uses approximately 1.25 CFM of regeneration air , with each tower drying for approximately 120 seconds before the dryer switches towers.
Two drain configurations are available:
- PN 21999-1140 – Float Drains: Standard automatic float drain configuration.
- PN 21999-1140-MM – Moisture Minder® Pneumatic Drains: Pneumatically operated automatic condensate drains.
Both configurations provide the same 25 CFM drying capacity, dew points down to -80°F, 120V operation, and 175 PSI maximum operating pressure .
Key Features
- 25 CFM maximum air flow
- Designed for approximately 7.5 HP compressed air systems
- Regenerative desiccant drying technology
- Dew points down to -80°F
- Relative humidity down to approximately 0.01% RH
- Two regenerative desiccant towers
- Molecular sieve desiccant
- One tower dries while the other regenerates
- Approximately 2-minute drying/regeneration cycle
- 120-second tower drying time
- Approximately 1.25 CFM regeneration air consumption
- Integrated two-stage pre-filtration
- First-stage water separator
- Second-stage oil coalescing filter
- Removes liquid water
- Removes bulk oils and aerosols
- Filters particulate down to 0.01 micron
- Solenoid valve timer
- Automatic condensate drains
- Purge exhaust mufflers
- Available with float or Moisture Minder® pneumatic drains
- 120V electrical power
- Maximum operating pressure of 175 PSI
- Maximum inlet temperature of 150°F
- 1/2" NPT inlet and outlet
- Wall mounting brackets included
- Few moving parts for simplified operation and maintenance
- Optional heater pads available for cold-temperature applications
- Optional C1D1-compatible configurations available for hazardous locations
Benefits
Provides Extremely Dry Compressed Air
The Pure-7 can provide compressed air with dew points down to -80°F , making it suitable for applications requiring substantially drier compressed air than a conventional refrigerated air dryer can typically provide.
Complete Filtration and Drying Package
The Pure-7 incorporates a water separator, oil coalescing filter, and regenerative desiccant dryer into one wall-mounted air treatment package.
Continuous Regenerative Drying
The twin-tower design allows one desiccant tower to actively dry compressed air while the second tower regenerates. Approximately every two minutes, the dryer automatically switches between towers.
Automatic Desiccant Regeneration
The Pure-7 uses approximately 1.25 CFM of dry sweep air to regenerate the inactive desiccant tower during operation. This continuously restores the desiccant's ability to adsorb water vapor.
Protects the Desiccant
Liquid water, compressor oil, and particulate contamination can quickly reduce desiccant performance. The Pure-7's integrated pre-filtration removes these contaminants before the compressed air reaches the molecular sieve desiccant towers.
Choice of Automatic Drain Systems
Choose the standard 21999-1140 with float drains or the 21999-1140-MM with Tsunami Moisture Minder® pneumatic drains depending on the condensate management system preferred for your application.
Compact Wall-Mounted Design
Despite its 25 CFM capacity, the Pure-7 combines filtration and regenerative drying into a compact wall-mounted package, saving valuable floor space.
Best For
The Tsunami Pure-7 is an excellent choice for:
- Automotive painting and refinishing
- Collision and body shops
- Paint spray guns
- Spray booths
- Professional coating applications
- Woodworking and finishing
- CNC equipment
- Pneumatic instrumentation
- Manufacturing equipment
- Automation equipment
- Moisture-sensitive pneumatic tools
- Commercial and industrial shops
- Dedicated point-of-use air drying
- Approximately 7.5 HP compressor systems
- Applications requiring extremely low dew points
Technical Specifications
| Specification | PN 21999-1140 | PN 21999-1140-MM |
|---|---|---|
| Series | Tsunami Pure-7 | Tsunami Pure-7 |
| Maximum Air Flow | 25 CFM | 25 CFM |
| Compressor Size | Approx. 7.5 HP | Approx. 7.5 HP |
| Dryer Type | Regenerative Desiccant | Regenerative Desiccant |
| Number of Towers | 2 | 2 |
| Power | 120V | 120V |
| Drain Type | Float | Moisture Minder® Pneumatic |
| Inlet Connection | 1/2" NPT | 1/2" NPT |
| Outlet Connection | 1/2" NPT | 1/2" NPT |
| Maximum Pressure | 175 PSI | 175 PSI |
| Maximum Inlet Temperature | 150°F | 150°F |
| Minimum Inlet Pressure | 80 PSI | 80 PSI |
| Minimum Dew Point | Down to -80°F | Down to -80°F |
| Regeneration Air Consumption | Approx. 1.25 CFM | Approx. 1.25 CFM |
| Cycle Time | Approx. 2 Minutes | Approx. 2 Minutes |
| Tower Drying Time | 120 Seconds | 120 Seconds |
| Towers Drying | 1 | 1 |
| Towers Regenerating | 1 | 1 |
| Weight | 60 lbs | 62 lbs |
| Dimensions (H × W × D) | 26" × 25" × 8" | 29" × 25" × 8" |
Integrated Two-Stage Pre-Filtration
Every Pure-7 system includes Tsunami two-stage pre-filtration before the regenerative dryer.
Stage 1 – Water Separator
- Removes liquid water
- Filters particulate down to 10 micron
- Automatic condensate drain
- Water Separator: PN 21999-0131
- Replacement Element: PN 21999-0227
Stage 2 – Oil Coalescing Filter
- Removes bulk oils and aerosols
- Filters fine particulate down to 0.01 micron
- Automatic condensate drain
- Oil Coalescing Filter: PN 21999-0131-Z-FD
- Replacement Element: PN 21999-0202
Proper pre-filtration is especially important with regenerative desiccant dryers because liquid water, compressor oil, and particulate contamination can contaminate the molecular sieve desiccant and reduce drying performance.
How the Tsunami Pure-7 Works
Compressed air first enters the integrated water separator , where liquid water and larger particulate contamination are removed.
The air then passes through the oil coalescing filter , which removes bulk oils, aerosols, and fine particulate contamination before the compressed air reaches the desiccant dryer.
Inside the dryer, molecular sieve desiccant adsorbs water vapor that cannot be removed by conventional compressed air filtration.
The Pure-7 contains two regenerative desiccant towers :
- One tower actively dries the compressed air.
- The second tower uses approximately 1.25 CFM of dry sweep air to regenerate its desiccant.
- Each tower dries for approximately 120 seconds .
- Approximately every two minutes, the dryer automatically switches air flow between the two towers.
- The regenerated tower begins drying while the previously active tower begins regeneration.
This continuous regeneration process provides extremely dry compressed air without requiring manual desiccant regeneration after each operating cycle.
Float Drain vs. Moisture Minder® Pneumatic Drain
PN 21999-1140 – Float Drain
The standard Pure-7 uses automatic float-operated drains on the integrated pre-filtration system.
Condensate is automatically discharged as it accumulates within the filter bowls, providing a simple and economical automatic drainage solution.
PN 21999-1140-MM – Moisture Minder® Pneumatic Drain
The 21999-1140-MM configuration uses Tsunami Moisture Minder® pneumatic drains for automatic condensate removal.
The pneumatic drain configuration provides dependable condensate removal without relying on an electrical timer drain and is an excellent choice for users who prefer Tsunami's pneumatic condensate management system.
Important Sizing Information
The Pure-7 has a maximum rated capacity of 25 CFM and is intended for approximately 7 to 7.5 HP compressor systems .
Tsunami's published dryer flow rating is based on operating conditions of approximately:
- 100°F inlet air temperature
- 175 PSI inlet pressure
- 100 PSI outlet pressure
- 80 PSI minimum inlet pressure
Lower inlet pressure and higher inlet temperatures can reduce dryer performance and downstream air quality.
The Pure-7 also consumes approximately 1.25 CFM of compressed air during regeneration , which should be considered when determining the total air capacity required from the compressor.
For best performance and dew point control, the dryer should be selected according to actual CFM, operating pressure, inlet temperature, and available compressor capacity , rather than compressor horsepower alone.
Why Choose the Tsunami Pure-7?
The Tsunami Pure-7 provides regenerative desiccant drying performance for compressed air systems that require up to 25 CFM of extremely dry compressed air.
By combining two-stage pre-filtration and twin-tower regenerative drying into one compact wall-mounted package , the Pure-7 provides a complete air treatment solution without the footprint of a larger industrial floor-mounted desiccant dryer.
Its regenerative design continuously restores the molecular sieve desiccant while the dryer operates, while the integrated water separator and oil coalescing filter protect the desiccant from damaging liquid water, oil, and particulate contamination.
For users who prefer pneumatic condensate management, the 21999-1140-MM Moisture Minder® version provides pneumatic drains while maintaining the same 25 CFM drying performance.
Why Buy from Compressed Air Advisors Online?
Compressed Air Advisors Online specializes in compressed air equipment, filtration, and air treatment systems. Proper sizing is particularly important with regenerative desiccant dryers because airflow, pressure, temperature, and regeneration-air requirements all affect dryer performance.
If you are unsure whether the Tsunami Pure-7 is the correct dryer for your compressor or application, contact our compressed air specialists. We can help determine the appropriate dryer size and configuration for your compressed air system.
Frequently Asked Questions
How much air can the Tsunami Pure-7 dryer handle?
The Tsunami Pure-7 regenerative air dryer is rated for up to 25 CFM of compressed air and is commonly paired with approximately 7 to 7.5 HP compressor systems .
What dew point can the Tsunami Pure-7 achieve?
Tsunami states that the Pure-7 can provide compressed air with dew points down to -80°F under appropriate operating conditions.
What is the difference between 21999-1140 and 21999-1140-MM?
Both models provide the same 25 CFM regenerative drying capacity.
PN 21999-1140 uses automatic float drains.
PN 21999-1140-MM uses Tsunami Moisture Minder® pneumatic drains.
Does the Tsunami Pure-7 include pre-filters?
Yes. The Pure-7 includes integrated two-stage pre-filtration consisting of a water separator followed by an oil coalescing filter.
Why does a regenerative desiccant dryer need pre-filtration?
Desiccant removes water vapor but should be protected from liquid water, compressor oil, aerosols, and particulate contamination. The Pure-7's integrated pre-filtration removes these contaminants before the compressed air reaches the molecular sieve desiccant towers.
How does the Pure-7 regenerate its desiccant?
The Pure-7 contains two desiccant towers. One tower dries compressed air while the second regenerates using dry sweep air. The dryer automatically switches between the two towers approximately every two minutes.
How much regeneration air does the Pure-7 use?
The Pure-7 uses approximately 1.25 CFM of compressed air for regeneration.
Does the Pure-7 require electricity?
Yes. Both PN 21999-1140 and PN 21999-1140-MM operate on 120V electrical power for the dryer control system.
What size connections are on the Tsunami Pure-7?
Both Pure-7 configurations use 1/2" NPT inlet and 1/2" NPT outlet connections .
What is the maximum operating pressure?
The maximum operating pressure is 175 PSI .
What is the minimum inlet pressure?
Tsunami specifies a minimum inlet pressure of 80 PSI for its published Pure-7 performance ratings.
What is the maximum inlet temperature?
The maximum published inlet air temperature is 150°F .
Is the Pure-7 a refrigerated air dryer?
No. The Pure-7 is a regenerative desiccant air dryer . It uses molecular sieve desiccant to remove water vapor and can achieve substantially lower dew points than a typical refrigerated compressed air dryer.
Should I size the Pure-7 based only on compressor horsepower?
No. Compressor horsepower provides a general sizing reference, but the dryer should ultimately be selected according to actual CFM, operating pressure, inlet air temperature, and available compressor capacity .
The Pure-7 is rated for 25 CFM and consumes approximately 1.25 CFM for regeneration .