Description

Tsunami High Temperature Pure-7 – Regenerative Desiccant Dryer System, 7.5 HP / 25 CFM, 120V, PN: 21999-1257

25 CFM High-Temperature Regenerative Desiccant Dryer | For 7.5 HP Compressors | Handles Inlet Air Up to 300°F | Integrated Aftercooler & Pre-Filtration | Dew Points Down to -40°F

Short Product Description

The Tsunami High Temperature Pure-7 Regenerative Dryer System, PN 21999-1257, is an all-in-one compressed air treatment package designed for hot, moisture-laden compressed air from approximately 7.5 HP compressor systems. Rated for 25 CFM and inlet temperatures up to 300°F, it combines a 50 CFM air-cooled aftercooler, two-stage pre-filtration, and twin-tower regenerative desiccant drying to provide dew points down to -40°F. Its compact wall-mounted design is ideal for spray foam rigs, automotive refinishing, mobile applications, wheel resurfacing, manufacturing, and small shops.

Full Product Description

The Tsunami High Temperature Pure-7 Regenerative Dryer System is designed specifically for compressed air applications where high compressor discharge temperatures make conventional drying difficult.

Rated for up to 25 CFM and approximately 7.5 HP compressor systems, PN 21999-1257 combines three critical compressed air treatment stages into one compact, ready-to-install system:

• A 50 CFM air-cooled aftercooler
• Integrated two-stage pre-filtration
• Twin-tower regenerative desiccant drying

This integrated design allows the system to accept compressed air with inlet temperatures up to 300°F, cool the air, remove condensed moisture and contamination, and then remove the remaining water vapor through regenerative desiccant drying.

Hot compressed air first passes through the integrated air-cooled aftercooler. The aftercooler lowers compressed air temperature to approximately 5°F to 20°F above ambient temperature. As the air cools, water vapor condenses into liquid, allowing the system to remove a substantial portion of the incoming moisture load before the air reaches the desiccant dryer.

Tsunami states that the high-temperature system can condense and remove up to approximately 75% of incoming moisture during the cooling and separation process.

The cooled air then passes through the integrated two-stage pre-filtration system:

• First Stage Water Separator: Removes liquid water and particulate contamination down to 10 micron.
• Second Stage Oil Coalescing Filter: Reduces oil aerosols while capturing fine particulate contamination down to 0.01 micron.

Once cooled and properly filtered, compressed air enters the twin regenerative desiccant towers. One molecular sieve 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, allowing continuous drying while the inactive desiccant bed regenerates.

The High Temperature Pure-7 can provide dew points down to -40°F under proper operating conditions, providing significantly drier compressed air than a conventional refrigerated dryer while accepting much higher inlet temperatures.

Key Features

• 25 CFM maximum air flow
• Designed for approximately 7.5 HP compressor systems
• Handles compressed air inlet temperatures up to 300°F
• Integrated 50 CFM air-cooled aftercooler
• Aftercooler lowers compressed air temperature to approximately 5°F–20°F above ambient
• Can condense up to approximately 75% of incoming moisture
• Compact all-in-one compressed air treatment package
• Integrated two-stage pre-filtration
• First-stage water separator
• Second-stage oil coalescing filter
• Twin-tower regenerative desiccant dryer
• Molecular sieve desiccant
• Dew points down to -40°F
• Low relative humidity
• One tower dries while the other regenerates
• Approximately 2-minute regeneration cycle
• 120-second tower drying time
• Approximately 1.25 CFM regeneration air consumption
• 0.024" regeneration orifice
• Automatic float condensate drains
• Purge exhaust mufflers
• 120 VAC electrical power
• Two power cords
• Maximum operating pressure of 175 PSI
• 3/4" NPT inlet
• 1/2" NPT outlet
• Wall-mounted configuration
• Designed for mobile and small-flow applications
• Simple, integrated installation
• 1-year manufacturer warranty

Benefits

Handles Compressor Discharge Air Up to 300°F

The High Temperature Pure-7 is specifically designed to accept compressed air temperatures up to 300°F.

This makes it an excellent solution when compressed air is coming directly from a hot compressor discharge and a suitable aftercooler is not already installed.

Integrated Aftercooler Removes Heat and Moisture

The included 50 CFM air-cooled aftercooler lowers compressed air temperature to approximately 5°F to 20°F above ambient.

Cooling the compressed air forces water vapor to condense into liquid so it can be efficiently removed before the air reaches the regenerative desiccant towers.

Dew Points Down to -40°F

After cooling, water separation, and oil coalescing filtration, the regenerative dryer removes the remaining water vapor.

Tsunami rates its High Temperature Regenerative Dryer system for dew points down to -40°F, providing considerably drier compressed air than a conventional refrigerated dryer.

Complete Air Treatment System

The 21999-1257 combines:

• Aftercooling
• Bulk moisture removal
• Water separation
• Oil coalescing filtration
• Fine particulate filtration
• Regenerative desiccant drying
• Automatic condensate drainage

into one integrated wall-mounted 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 switches towers automatically, providing continuous drying without requiring manual desiccant regeneration during normal operation.

Protects the Desiccant

Liquid water, compressor oil, and high moisture loads can shorten desiccant life and reduce dryer performance.

The High Temperature Pure-7 cools and filters the compressed air before it reaches the molecular sieve desiccant, significantly reducing the contamination and moisture load placed on the dryer.

Compact Wall-Mounted Design

The complete aftercooler, pre-filtration system, and regenerative dryer are packaged into a compact wall-mounted assembly.

This helps preserve floor space in trailers, mobile rigs, compact compressor rooms, and workshops.

Designed for Mobile Applications

Tsunami specifically designed the High Temperature Regenerative Dryer Series for mobile and compact installations where space, vibration, and high compressed air temperatures can make conventional drying systems difficult to use.

Best For

The Tsunami High Temperature Pure-7 is an excellent choice for:

• Spray foam rigs
• Spray foam insulation equipment
• Automotive painting and refinishing
• Mobile automotive refinishing
• Wheel resurfacing
• Professional coating applications
• Mobile service vehicles
• Equipment trailers
• Beverage canning applications
• Small manufacturing operations
• Small commercial shops
• Hot compressor discharge applications
• Point-of-use compressed air drying
• Approximately 7.5 HP compressor systems
• Applications without a separate aftercooler
• Applications requiring very dry air from high-temperature compressed air

Technical Specifications

Integrated High-Temperature Air Treatment

The 21999-1257 treats compressed air through three primary stages.

Stage 1 – Air-Cooled Aftercooler

Hot compressed air first enters the integrated 50 CFM air-cooled aftercooler.

The aftercooler:

• Accepts compressed air temperatures up to 300°F
• Lowers air temperature to approximately 5°F–20°F above ambient
• Forces water vapor to condense into liquid
• Can remove up to approximately 75% of the incoming moisture load
• Reduces the moisture load placed on the downstream filters and regenerative dryer
• Helps improve overall dryer efficiency

Cooling compressed air before filtration is critical because conventional water separators remove liquid water, not water vapor. Lowering the compressed air temperature converts a large portion of the vapor into removable condensate.

Integrated Two-Stage Pre-Filtration

After cooling, compressed air passes through Tsunami's two-stage filtration system.

Stage 2A – Water Separator

• Removes liquid water
• Filters particulate down to 10 micron
• Automatic float drain
• Water Separator: PN 21999-0131
• Replacement Element: PN 21999-0227

Stage 2B – Oil Coalescing Filter

• Removes bulk compressor oils and aerosols
• Reduces oil aerosol contamination
• Filters fine particulate down to 0.01 micron
• Automatic float drain
• Oil Coalescing Filter: PN 21999-0131-Z-FD
• Replacement Element: PN 21999-0202

Proper pre-filtration protects the molecular sieve desiccant from liquid water, oil, aerosols, and particulate contamination.

Stage 3 – Regenerative Desiccant Dryer

Once the compressed air has been cooled and filtered, it enters the twin-tower regenerative dryer.

Molecular sieve desiccant removes the remaining water vapor from the compressed air, allowing the High Temperature Pure-7 system to provide dew points down to approximately -40°F under proper operating conditions.

How the Tsunami High Temperature Pure-7 Works

The High Temperature Pure-7 uses a multi-stage process to turn hot, moisture-laden compressed air into clean, dry compressed air.

1. Hot compressed air enters the 50 CFM aftercooler.
2. The aftercooler reduces the compressed air temperature toward ambient.
3. Cooling causes water vapor to condense into liquid.
4. The water separator removes bulk liquid condensate and larger particulate contamination.
5. The oil coalescing filter removes compressor oil, aerosols, and fine particulate contamination.
6. Properly cooled and filtered compressed air enters the regenerative dryer.
7. One molecular sieve desiccant tower removes water vapor.
8. The second tower regenerates using dry sweep air.
9. Approximately every 120 seconds, the dryer automatically switches towers.
10. The regenerated tower begins drying while the previously active tower begins regeneration.

This continuous process provides clean, exceptionally dry compressed air while allowing the system to accept very high compressor discharge temperatures.

Why High Inlet Temperature Matters

Compressed air leaving a compressor can be extremely hot.

Hot compressed air is capable of holding considerably more water vapor than cooler compressed air. If that air is sent directly into filters or a desiccant dryer, much of the water may still be in vapor form and cannot yet be mechanically separated.

The High Temperature Pure-7 solves this problem by cooling the compressed air first.

As the compressed air temperature drops, water vapor condenses into liquid. The water separator can then remove that condensate before the air enters the oil coalescing filter and regenerative dryer.

This reduces the moisture load on the desiccant and improves overall drying performance.

High Temperature Pure-7 vs. Standard Pure-7

Although both systems provide approximately 25 CFM of compressed air treatment capacity, they are designed for different inlet conditions.

Choose the High Temperature Pure-7 when compressed air is coming directly from a hot compressor discharge or when a properly sized aftercooler is not already installed.

The standard Pure-7 may be the better choice when compressed air is already adequately cooled before entering the dryer.

High Temperature Regenerative vs. Refrigerated Air Dryer

A conventional refrigerated dryer is an excellent solution for many stationary compressed air systems, but refrigerated dryers have specific inlet-temperature limits and typically produce pressure dew points around the mid-30°F range.

The Tsunami High Temperature Pure-7 takes a different approach.

It combines:

• Air-cooled aftercooling
• Moisture separation
• Oil coalescing filtration
• Regenerative desiccant drying

This makes the High Temperature Pure-7 particularly useful when the application involves:

• Very hot compressor discharge air
• Mobile installations
• Limited floor space
• Spray foam rigs
• Trailers and service vehicles
• Applications requiring a lower dew point than a typical refrigerated dryer

Important Sizing Information

The High Temperature Pure-7 has a maximum rated flow of 25 CFM and is designed for approximately 7.5 HP compressor systems.

The integrated aftercooler can accept compressed air temperatures up to 300°F.

Dryer performance ultimately depends on several operating conditions, including:

• Actual compressed air demand
• Compressor discharge temperature
• Ambient temperature
• Operating pressure
• Inlet moisture load
• Regeneration air consumption
• Required downstream dew point

The Pure-7 regenerative dryer uses approximately 1.25 CFM of compressed air during regeneration, which should be considered when determining total compressor capacity.

For best performance, size the system based on actual CFM, pressure, inlet temperature, and application requirements, rather than compressor horsepower alone.

Why Choose the Tsunami High Temperature Pure-7?

The Tsunami High Temperature Pure-7 solves a common compressed air treatment problem: how to properly cool, filter, and dry extremely hot compressed air without assembling several separate components.

Instead of separately sizing and installing an aftercooler, water separator, oil coalescing filter, and regenerative dryer, Tsunami packages these components into one compact wall-mounted system.

For spray foam rigs, mobile applications, paint operations, trailers, small shops, and other high-temperature compressed air applications requiring up to 25 CFM, PN 21999-1257 provides a complete air treatment system designed to handle inlet temperatures up to 300°F.

Why Buy from Compressed Air Advisors Online?

Compressed Air Advisors Online specializes in compressed air equipment, filtration, aftercooling, and air treatment systems. High-temperature compressed air applications require careful sizing because airflow, compressor discharge temperature, ambient temperature, operating pressure, moisture load, and required dew point all affect dryer performance.

If you are unsure whether the Tsunami High Temperature Pure-7 is the correct solution for your compressor or application, contact our compressed air specialists. We can help determine whether you need a high-temperature regenerative system, conventional Pure Series dryer, refrigerated dryer, or another compressed air treatment configuration.

Frequently Asked Questions

How much air can the Tsunami High Temperature Pure-7 handle?

The Tsunami High Temperature Pure-7, PN 21999-1257, is rated for up to 25 CFM and is designed for approximately 7.5 HP compressor systems.

What is the maximum inlet temperature?

The complete High Temperature Pure-7 system can accept compressed air temperatures up to 300°F at the aftercooler inlet.

What dew point can the High Temperature Pure-7 achieve?

Tsunami's current High Temperature product literature publishes dew points down to -40°F under proper operating conditions.

Why is the High Temperature Pure-7 rated to -40°F when the standard Pure-7 says -80°F?

The two systems are published for different operating environments.

The High Temperature Pure-7 is specifically designed to accept compressor discharge air temperatures up to 300°F and includes an aftercooler, filtration, and regenerative dryer.

Tsunami's current High Temperature product literature specifies dew points down to -40°F, while the standard Pure Series product literature publishes lower potential dew points under its specified inlet conditions.

Does PN 21999-1257 include an aftercooler?

Yes. The system includes an integrated 50 CFM air-cooled aftercooler.

How cool does the aftercooler make the compressed air?

Tsunami states that the aftercooler can reduce compressed air temperature to approximately 5°F to 20°F above ambient temperature.

How much moisture can the aftercooler remove?

Tsunami states that the High Temperature system can condense and remove up to approximately 75% of the incoming moisture load during aftercooling.

Does the High Temperature Pure-7 include pre-filtration?

Yes. The system includes a water separator and oil coalescing filter between the aftercooler and regenerative dryer.

What filtration components are used?

The High Temperature Pure-7 uses:

• Water Separator: PN 21999-0131
• Water Separator Replacement Element: PN 21999-0227
• Oil Coalescing Filter: PN 21999-0131-Z-FD
• Oil Coalescing Replacement Element: PN 21999-0202

How does the regenerative dryer work?

The Pure-7 contains two molecular sieve desiccant towers. One tower removes water vapor from compressed air while the second regenerates using dry sweep air.

The dryer automatically switches between towers approximately every two minutes.

How much regeneration air does the High Temperature Pure-7 use?

The Pure-7 regenerative dryer uses approximately 1.25 CFM of compressed air during regeneration.

What type of drains does PN 21999-1257 use?

The High Temperature Pure-7 uses automatic float drains for condensate removal.

What voltage does PN 21999-1257 require?

The High Temperature Pure-7 operates on 120 VAC.

The complete system uses two electrical power cords.

What size connections are on PN 21999-1257?

The system has a 3/4" NPT inlet and a 1/2" NPT outlet.

What is the maximum operating pressure?

The maximum operating pressure is 175 PSI.

How large is the High Temperature Pure-7?

PN 21999-1257 measures approximately 27" H × 38" W × 13" D and weighs approximately 88 lbs.

Is the High Temperature Pure-7 designed for mobile applications?

Yes. Tsunami designed the High Temperature Regenerative Dryer Series for mobile and small-flow applications, including spray foam rigs, mobile refinishing, trailers, compact workshops, and similar installations.

Can I use the High Temperature Pure-7 instead of a refrigerated air dryer?

Potentially. The correct drying technology depends on compressed air flow, inlet temperature, operating pressure, ambient temperature, required dew point, available space, and whether the application is mobile or stationary.

The High Temperature Pure-7 is particularly well suited for applications with very hot inlet air, limited space, and a need for very dry compressed air.

Tsunami High Temp Desiccant Manual

Tsunami High Temp Desiccant Brochure