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H Series Desiccant Heatless Air Dryers
- Standard Equipment
- Optional Equipment
- Size a H Series Dryer
- H Series Switching Valves
- Standard Controls
- ProPurge (standard HW250 & UP)
- Optional PowerLoc Energy Management Controller
- Mounted Filters (standard equipment)
- Specifications (dimensions, weight, etc)
- About H Series Desiccant Air Dryers
HW1000 with Standard Package E Filters Mounted
Standard Equipment
- Package E Filters includes mounted coalescer and particulate filter
- Electric 120/1/60
- Pro Purge demand controller (Models HW250-6,000 SCFM)
- Solid state controller
- Centrifugal compressor surge protection (Models HW75-6,000 SCFM)
- System sequence annunciator
- CycleLoc demand control
- Variable cycle control (Models HW75-6,000 SCFM)
- Purge flow indicator
- Purge flow regulator (Models HW75-3,000 SCFM)
- Repressurization circuit (Models HW75-6,000 SCFM)
- Control air filter (Models HW75-6000 SCFM)
- High performance butterfly valves (Models HW1000-6,000 SCFM)
- 3-Year valve warranty (Models HW1000-6,000 SCFM)
- ASME coded pressure vessels (Models HW100-6,000 SCFM)
- Separate tower pressure gauges
- Safety valves
- Cushioned seat, check valves
- Separate fill /drain ports
- NEMA 4 controls
- Stainless steel diffuser screen
- Pressure equalization
- Structural steel base
- 150 PSIG design standard
- Moisture indicator (Models HW75-200 SCFM)
Optional Equipment
- Filter packages with dual filters and bypass
- PowerLoc automatic demand control includes:
- Solid state controller
- Digital dew point readout
- High humidity alarm with dry contacts
- Self calibrating
- Ambient compensation
- Signal stabilizer
- 4-20 mA output
- All NEMA classifications
- Pressure to 1,000 PSIG
- High humidity alarm
- Switch failure alarm
- Electronic drain systems
- -80 to -100°F dew points
- Contacts for remote alarms
- Oilfield construction
- Flow meter
How to Select a H Series Dryer
Here is how to easily size a H Series desiccant air dryer.
| Inlet Air Pressire Correction |
| PSI | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 150 |
| BAR | 3.5 | 4.1 | 4.9 | 5.5 | 6.2 | 6.9 | 7.6 | 8.3 | 9 | 9.7 | 10.3 |
| Correction Factor | 0.56 | 0.65 | 0.74 | 0.83 | 0.91 | 1 | 1.09 | 1.18 | 1.27 | 1.37 | 1.43 |
Example Calculations
HW500 Corrected for 120 PSI (8.3 Bar)
CORRECTED CAPACITY = (RATED CAPACITY) X (PSI Correction)
= 500 SCFM X (1.18)
= 590 SCFM
Valves
Non-Lubricated Valves
Dryers 75 to 800 SCFM are equipped with our time-proven and dependable non-lubricated switching valves. The independent, air operated valves are specifically designed for compressed air service. They are resistant to desiccant dust and can be maintained without being removed from the dryer.
Rotary Actuated Valves
High performance, Rotary Actuated Switching Valves are standard on dryers 1,000 SCFM and larger. These premium, air operated butterfly valves are specifically designed to allow higher flow with lower associated pressure drop. They provide more opening and closing force compared to other types of valves. An indicator shows the “open/closed” position of the valve and service can be performed without disturbing dryer piping. These valves are so reliable, they carry a three-year factory warranty.
Purge Flow Regulator
While other dryers use a manual valve for purge control, eCompressedair provides a Purge Flow Regulator. Due to system pressure fluctuation, dryers equipped with manual purge valves waste air and energy by over-purging when system pressure is high and sacrifice performance by under-purging when system pressure is low. Manual purge valves do not compensate for system pressure variance. eCompressedair’s exclusive Purge Flow Regulator saves energy and ensures performance by maintaining optimum purge regardless of system pressure. To prevent the purge flow from fluctuating and to discourage unauthorized tampering, the Purge Flow Regulator can be locked into position.
Standard Controls
Sequence Annunciator
Models HW10 to HW55 Control Panel
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The Sequence Annunciator is a solid state visual display panel that shows exactly what is happening in the dryer. The panel lights signal which tower is “on line” drying, and whether the “off line” tower is purging, repressurizing or in “CycleLoc”. It will also annunciate optional equipment operation and function alarms. The panel is integral with the NEMA 4 Master Control and is conveniently mounted for easy monitoring.
CycleLoc
Significant energy savings and reduced air compressor demand are achieved by cycling the dryer with the air compressor. When the air compressor unloads or shuts off, “CycleLoc” automatically stops the purge and holds the dryer’s cycle position until load is resumed. The “CycleLoc” function is activated by the air compressor’s relay or pressure switch. Contacts are provided in the dryer’s NEMA 4 control panel. A panel mounted light indicates “CycleLoc” activation.
Variable Cycle Control
Models HW75 to HW200 Control Panel
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Additional energy savings can be achieved by adjusting the amount of purge to the actual moisture load. When demand is expected to be less than maximum, E Compressed Air’s Variable Cycle Control provides a means to adjust the purge cycle time to reduce the total amount of purge used for regeneration. As a result of less frequent cycling, the desiccant will last longer and the switching valves will require less maintenance. The Variable Cycle Control incorporates a short cycle position that can be employed to provide dew points as low as -80°F.
Surge Protection
To accommodate the unique requirements of centrifugal compressors, all eCompressedair desiccant dryers are now programmed with a special anti-surge control. A sequenced timing circuit eliminates potential compressor surge by preventing momentary flow restrictions from occurring at tower switch over.
Total dryer operation is managed by E Compressed Air’s NEMA 4 automatic control center. The solid state module controls all dryer functions including the Sequence Annunciator.
Pro-Purge Demand Control (Standard Equipment Models HW250 & Up)
Pro Purge Control Panel (Standard on Models HW250 & Up
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eCompressedair’s Pro-Purge is standard equipment on models HW250 and larger. It is an advanced Proportional Demand
Controller that saves energy by automatically regulating the purge cycle
in response to actual loads. Moisture loads fluctuate throughout the day
and rarely reach maximum moisture levels, and therefore, waste energy
by regenerating more often than is necessary. The Pro-Purge monitors
actual compressed air moisture levels and prevents cycle advancement
until the designed saturation is read.
LED Display Panel
The Pro-Purge Panel lights indicate:
- Power Saver Mode/Demand Control active “ON” LED.
- “OFF” LED indicates the Pro-Purge Demand Control is
deactivated and the dryer is functioning in the fixed cycle
default mode.
High Dew Point Alarm
The High Dew Point Alarm is activated when dew points rise above -20°F.
It would also activate in the event of a short circuit or should the sensor
become disconnected. Dry contacts for an external alarm are provided.
Optional PowerLoc Energy Management System
The optional PowerLoc controller provides energy savings and operating cost reduction.
PowerLoc automatically adjusts energy use to actual moisture load. Moisture loading is affected by inlet temperature, pressure, relative humidity and flow. These conditions vary throughout the day and rarely combine in such a manner as to produce maximum moisture loads. An inlet temperature reduction of just 20OF (-7OC) will reduce the moisture load by almost 50%.
Desiccant dryers are normally sized for “worst case” operation with the cycle fixed to accommodate maximum moisture loads. Because the fixed cycle does not compensate for fluctuating loads, dryers not equipped with PowerLoc waste energy by regenerating more often than necessary. PowerLoc eliminates the unnecessary use of energy by delaying regeneration until the total design moisture load is achieved. The system monitors actual moisture loading and limits the number of purge cycles accordingly.
At $0.08 per Kwh, the PowerLoc would save over $10,000 annually when used with a 1,000 SCFM heatless dryer operating at 70% load for 8,000 hours at an average inlet temperature of +85°F (29°C). Digital dew point control provides for additional energy savings by allowing the operator to select higher dew points when appropriate. The moisture probe is contained in and protected by a rugged, stainless steel housing that also contains an electronics package for continuous self calibration, temperature compensation, and signal stabilization. Due to less frequent cycling, switching valves and desiccant will last longer and require less maintenance.
The PowerLoc ceramic sensor is made
from state-of-the-art metalized ceramic
and replaces traditional materials such as
aluminum, silicon and hygroscopic salts.
This fast response sensor is made from a
ceramic tile that is plated and vapor
deposited to form a surface that is very
sensitive to small changes in water vapor
pressure.
The proprietary coating processes make the ceramic sensor inherently faster to respond than
other impedance or capacity sensors currently available. The ceramic sensor features the latest
digital technology with calibration data stored directly in the sensor’s memory, and is equipped
with a built-in thermistor for automatic temperature compensation. The PowerLoc is traceable
to the National Institute of Standards and Technology. A certificate of traceability is available.
The PowerLoc ceramic sensor is protected by an 80 micron sintered metal guard and is enclosed
in a rugged, stainless steel housing with a pressure rating of 5,000 PSIG. This housing increases
the sensor’s ability to withstand reasonable shock and vibration.
Effects of Inlet Temperature on Moisture Load
Filters
Factory installed coalescer and particulate filters come standard with every eCompressedair H Series Dryer. See package E for diagram of standard filter package.
The standard equipment, package E filter package matches our HW heatless dryers with high
performance filters. In-line filters (JW) are used on systems 100 through
300 SCFM and two stage (JL) severe duty filters are used on systems 400
SCFM and larger.
The coalescing pre-filter is installed at the dryer inlet. It protects the dryer
by removing liquids and reducing the contamination level of the
compressed air to .01 PPM by weight. The element is DOP rated at
99.9+% efficient in the 0.3 to 0.6 micron range. An integrated digital
indicator is provided to determine element condition. An electronic drain
valve is provided on systems 100 through 300 SCFM to ensure proper
drainage. On systems 400 SCFM and larger a zero air loss demand drain
is provided. The drain controller includes push to test, drain alarm, and
common alarm contact.
To protect downstream equipment from desiccant dust a particulate
after-filter is installed at the dryer discharge. The after-filter element is
designed to remove solid particulates from compressed air. The hybrid
pleated filter media provides high dirt retention, low pressure drop, and
long element life. The element is 100% effective in removing particles 0.9
micron and larger. A integrated digital element condition indicator is also
provided.
Package E (Standard Filters)
Standard Filter Package E includes dryer with factory installed pre-filter and after-filter.
Optional Package EB
Includes dryer with factory installed pre-filter and after-filter with system
bypass.
Optional Package EC
Includes dryer with factory installed dual selectable pre-filters and single
after-filter.
Optional Package ED
Includes dryer with factory installed dual selectable pre and after-filters.
Note: Consult factory for other package configurations
Engineering Specifications
| Model | SCFM | Approx-
imate Purge | Length
in. (mm) | Width
in. (mm) | Height
in. (mm) | Weight (lbs) | Connections (In & Out) |
| HW10** | 10 | 2 | 19 (483) | 16 (406) | 46 (1168) | 108 | 3/8 in. NPT |
| HW15** | 15 | 2 | 19 (483) | 16 (406) | 46 (1168) | 112 | 3/8 in. NPT |
| HW25** | 25 | 4 | 19 (483) | 16 (406) | 64 (1626) | 156 | 1/2 in. NPT |
| HW40** | 42 | 6 | 21 (533) | 17 (432) | 48 (1219) | 190 | 1/2 in. NPT |
| HW55** | 60 | 9 | 21 (533) | 20 (508) | 67 (1702) | 230 | 3/4 in. NPT |
| HW75 | 75 | 11 | 35 (889) | 27 (686) | 80 (2032) | 384 | 3/4 in. NPT |
| HW100 | 107 | 16 | 35 (889) | 27 (686) | 80 (2032) | 468 | 1 in. NPT |
| HW130 | 135 | 20 | 35 (889) | 21 (533) | 70 (1778) | 496 | 1 in. NPT |
| HW200 | 200 | 30 | 44 (1118) | 28 (711) | 78 (1981) | 692 | 1 1/2 in. NPT |
| HW250 | 250 | 38 | 44 (1118) | 30 (762) | 78 (1981) | 776 | 1 1/2 in. NPT |
| HW300 | 300 | 45 | 44 (1118) | 30 (762) | 78 (1981) | 796 | 1 1/2 in. NPT |
| HW400 | 400 | 60 | 74 (1880) | 41 (1041) | 84 (2134) | 1626 | 2 in. NPT |
| HW500 | 510 | 77 | 74 (1880) | 41 (1041) | 85 (2159) | 1735 | 2 in. NPT |
| HW600 | 650 | 98 | 74 (1880) | 41 (1041) | 86 (2184) | 1740 | 2 in. NPT |
| HW770 | 800 | 120 | 74 (1880) | 41 (1041) | 91 (2311) | 2120 | 2 in. NPT |
| HW1000 | 1000 | 150 | 108 (2743) | 54 (1372) | 88 (2235) | 3676 | 3 in. FL |
| HW1200 | 1200 | 180 | 108 (2743) | 54 (1372) | 111 (2819) | 4605 | 3 in. FL |
| HW1500 | 1500 | 225 | 114 (2896) | 66 (1676) | 100 (2540) | 4985 | 4 in. FL |
| HW2000 | 2000 | 300 | 120 (3048) | 66 (1676) | 100 (2540) | 5206 | 4 in. FL |
| HW2600 | 2600 | 390 | 144 (3658) | 72 (1829) | 110 (2794) | 7600 | 4 in. FL |
| HW3000 | 3000 | 450 | 144 (3658) | 72 (1829) | 110 (2794) | 8300 | 4" / 6" FL |
| HW4000 | 4000 | 600 | 204 (5182) | 84 (2134) | 112 (2845) | 10300 | 6" FL |
| HW5000 | 5000 | 750 | 156 (3962) | 84 (2134) | 115 (2921) | 12700 | 6" FL |
| HW6000 | 6000 | 900 | 192 (4877) | 84 (3134) | 114 (2896) | 16500 | 6" FL |
Notes:
** Electronic Switching Valves
- SCFM is at 100 PSI and 100°F.
- Dimensions and weight are for dryer with standard Package E filters installed.
- Dimensions measured in inches and millimeters.
- Weight measured in pounds and includes desiccant. Desiccant shipped loose with models 1500 SCFM and up.
- Specifications and dimensions are subject to change without notice.
- Pressure Drop at Rated Flow: Less Than 5 PSI (0.34 Bar)
- Maximum Inlet Air or Ambient Air Temperature 120°F (49°C)
- Maximum Working Pressure: 150 PSIG (10.5 Bar) Standard
- Units for higher maximum working pressures are available.
- Minimum Operating Pressure: 50 PSIG (3.5 Bar)
About H Series Heatless Desiccant Air Dryers
eCompressedair Heatless Dryers remove water vapor from compressed air through a process known as Pressure Swing Adsorption. Pressure dew points ranging from -40O°F to -100°F are attained by directing the flow of saturated compressed air over a bed of desiccant. The most commonly used desiccant is activated alumina, a spherical shaped, hygroscopic material, selected for its consistent size, shape and extreme surface to mass ratio.
This physically tough and chemically inert material is contained in two separate but identical pressure vessels commonly referred to as “dual” or “twin” towers. As the saturated compressed air flows up through the “on line” tower, its moisture content adheres to the surface of the desiccant. The dry compressed air is then discharged from the chamber into the distribution system.
A solid state controller automatically cycles the flow of compressed air between the towers, while the “on line” tower is drying, the “off line” tower is regenerating. Regeneration, sometimes referred to as purging, is the process by which moisture accumulated during the “on
line” cycle is stripped away during the “off line” cycle. As low pressure dry purge air flows gently through the regenerating bed, it attracts the moisture that had accumulated on the surface of the desiccant during the drying cycle and exhausts it to the atmosphere. To protect the desiccant bed from excess liquid, all our heatless dryers are designed to work with the natural pull of gravity. By directing the saturated air into the bottom of the “on line” tower and flowing up through the bed, liquid condensate caused by system upset, is kept away from the desiccant and remains at the bottom of the tower where it can be easily exhausted during the regeneration cycle. Counter flow purging ensures optimum performance by keeping the driest desiccant at the discharge end of the dryer.
Moisture load, velocity, cycle time and contact time determine tower size and the amount of desiccant. To ensure design dew point, each tower is carefully sized to allow a minimum of 5.5 seconds of contact. To prevent desiccant dusting and bed fluidization, air flow velocities are kept below 50 feet per minute. The dryer can cycle for years without changing the desiccant.
Heatless dryers in general are the most reliable and least expensive of all desiccant type dryers. eCompressedair Heatless Dryers are the most energy efficient thanks to standard features like, Variable Cycle Control, CycleLoc, and ProPurge.
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