Heatless

Air
Dryers
Precise Air Purification

Dual Tower Heatless Desiccant Air Dryer

EAP
800.943.7924 • www.engineeredairproducts.com
 Designed for Reliability

As manufacturing processes continue to improve with rapid advancements

in technology, the requirements for clean, dry compressed air critical
for sensitive applications is imperative, regardless of the compressor
technology. The use of dried and filtered air lowers plant operational
costs by preventing corrosion from forming in plant air distribution systems causing expensive pressure drops,
premature wear of pneumatic devices and freeze up when seasonal drops in temperature occur. Utilizing dried
and filtered compressed air increases overall product quality, decreases rejected material due to inconsistent air
quality and reduces maintenance costs associated with condensate contamination of costly production equipment.

Engineered Air Products has been at the forefront of Desiccant Dryer development and manufacturing since
2008, establishing EAP as the leader in low dew point dryer technology with focus on desiccant dryers capable
of ISO Class 8573-1, class 3 for dew point or better. EAP’s team of engineers and product developers designing
industry leading products, sales and service teams conveying superior product knowledge and support and
manufacturing professionals combining synergies to build the most technologically advanced dryers available
anywhere. A customer centric approach with emphasis on customer service enables EAP to flourish and grow a
robust independent distribution network with ease of doing business and top-notch customer service top priorities.

HL Series

The HL Series Heatless compressed air dryers are comprised of two identical and equal columns or towers
filled with an adsorbent media called desiccant, a hydroscopic rigid material which is nano-porous and sponge-like
providing large surface to mass ratio. The drying process is fairly straightforward with compressed air saturated with
water vapor flowing upward through the drying tower with the water molecules adhering to the porous surface of
the drying media where the residual water content of the compressed air is lowered to a pressure dew point of
-40° F or lower. Concurrently, some of this purified air (15%) is directed
Air Out downward through the depressurized off-line tower in a process referred to
as regeneration, where this dry air sweep desorbs water molecules from the
ure surface of the media, exhausted to atmosphere, preparing that column for
Reuator service. This process is known as pressure swing adsorption and is typically
completed in a fixed 10-minute NEMA cycle, with the towers alternating
drying – regenerating typically every 5 minutes.

All EAP dryers take advantage of gravitational forces and utilize up-flow
drying and down-flow (counter current) regeneration resulting in minimum
desiccant abrasion and attrition. This method of drying and regenerating
urin

also keeps bulk liquid moisture from system upset on the bottom of
Dryin

the drying tower where it is easily expelled during depressurization and

regeneration and ensures optimum performance ensuring the driest
desiccant towards the top of the tower nearest to exit. HL Series heatless
dryers are the most reliable and least expensive of the “twin tower” types
and are more energy efficient thanks to features like Cycle Stop, Purge
flow regulator, and Optional Demand Control.
Ehaust
ufflers
ain Ehaust alve

Inlet alve

Air In
 Complete Air Treatment Solution

The HL Series Dryers are designed to be a complete air treatment

solution sized for low pressure drop and performance, outfitted
with standard equipment to include an oil removal 0.01 micron
coalescing pre - filter, desiccant dryer for moisture removal,
and a 1 micron particulate after filter in one complete package.
Standard 120/1/60 with differential pressure indicators on each
filter with pre-filter automatic drain all mounted to a rugged
industrial steel base to ensure a solidly anchored system.

HL-15 to HL-1500 HL-2000 to HL-5000 Standard acae ypass Option

EA Series Cast Filters: ZF Series Fabricated Filters:
• Cast Aluminum Construction • Carbon Steel Construction  Dryer A  Dryer A
• Delta P Gauge • ASME Coded Stamped
• Automatic Timer Drain • Flange Connections
• .01µm Particle Removal • Delta P Gauge
• .01 PPM Max. Carryover • 2-Stage Large Filtration Dual Selectale re-ilter with Sinle After-ilter Dual Selectale ilter with 9 alve ypass
• 250º F Max. Temperature • Automatic Timer Drain   A
• 250 PSIG Max. Pressure • 1µm Particle Removal
Dryer A Dryer
• .1 PPM Max. Carryover
  A
• 275º F Max. Temperature
• 200 PSIG Max. Pressure      

Designed for Reliability

All EAP HL Series dryers are designed for reliability and reduction of costly down time. EAP accomplishes this by
exclusive use of a stainless-steel three-way inlet valve (up to 800 SCFM) that results in a 30% reduction in control valves.
This design simplification results in a more reliable package at a lower cost. These valves are so reliable that they
come with a three-year limited factory warranty. Rotary Actuated High-Performance Butterfly valves are used on
1,000 SCFM and larger.
 HL Dryer Logic Pro Controller

The EAP HL Dryer controller features a dependable Allan

Bradley PLC with four-line digital display and text status.
The linkage between all aspects of dryer controls are hard
wired and are easily field serviceable. Controls include
run / standby switch, active cycle mode, tower drying
indication, tower regenerating indication, run status.
Tower pressure gauges, moisture indicators and filter
differential pressure indicators are included ensuring an
intuitive interface.

The cycle control

keys allow the
user to optimize dryer cycle time to plant demand and differing air quality
needs. The exclusive auto start allows the dryer to start itself once power
is introduced and will auto restart following a power failure once power is
restored. Standard Purge Stop allows the dryer to use purge air only when
the compressor is running or loaded saving significant amounts of energy and
wear, preventing the dryers’ purge from short cycling the compressor during
lighter loads.

Digital Display Features:

• Active Mode
• Tower Drying Indication
• Tower Regenerating Indication
• Run Status

Optional Ecotronic Demand Control

EcoTronic Demand Control automatically adjusts energy use to actual moisture loads. Typically, compressed air loads
vary due to changes in inlet air temperature, pressure, relative humidity and flow. Since dryers are generally sized for
worst cast scenarios, and rarely take into consideration these varying loads, fixed cycle dryers switch based on a timed
cycle only, and thus regenerate more frequently than probably necessary. Dryers equipped with EcoTronic Demand
Control operate by sensing dryer discharge dew point and regenerate only as needed. If dryer load is lower than worst
case conditions, the online tower will remain online beyond its fixed cycle time, thus saving energy by not switching
and purging as frequently.

Alternatively, if the dryer were to experience a temporary over load condition,

coupled with a high dew point alarm (typically -20° F) due to a number of
potential factors including elevated inlet air temperatures due to a fouled
or dirty air cooler, the dryer will automatically initiate Dew Point Overload
Control (Patent Pending). This feature, once enabled, will automatically adjust
the dryers’ cycle to recover and operate at the original dew point set point
(typically -40° F). Once successfully recovered, the dryer will revert to its
original operating mode and allow on site personnel to address the root cause.
This feature is revolutionary and exclusive to EAP.
 HL Dryer Standard Equipment

Allen Bradley PLC Controller:

• Four-Line Display
• NEMA 4X Control Enclosure
• Selectable Cycles
• Cycle Stop
• cETLus Approval Control Panel
• Adjustable Re-pressurization Timing
• Dew Point Overload Control

E-Z Switching Valves

Tower Dew Point Indicators
• Three-Way Inlet Reduces Number Of Valves
• Visual Dew Point Condition
• Soft Switching For Extreme Valve Life
• Led Valve Position Indicator
Welded Frame Base
• Three-Year Warranty On Switching Valves
• Maintains Structural Integrity of Dryer
• Move With Standard Fork Truck
Factory Installed Filters
• Hard Point Mounting For Installation Integrity
• Delta PSI Gauges For Element Condition Additional Features
• Pre-Filter Timer Drain • Tower Pressure Gauges
• OSHA Approved Mufflers
Regulated Purge (HL100 and larger) • ASME / CRN Approved Vessels (HL-100 & Larger)
• Factory Pre-Set • Desiccant Fill and Drain Ports
• Optimum Purge Regardless of Operating Pressure • ASME Safety Relief Valves
• Independent Re-Pressurization Circuit • Standby Mode
• Manual Cycle Stepping
• Control Line Filter / Regulator

Optional Equipment

• Dual Filter and By-Pass Packages • Modbus and Other Communication Protocols
• High Pressure See HHP Page • Custom Designs
• -100º F Pressure Dew Point Dee HLD Page • Differential Pressure Gauges and Transmitters
• EcoTronic Dew Point Demand Control • 304 Stainless Steel Control Tubing with Swagelok Fittings
• Dew Point Recovery Mode • Consult Factory for Additional Options
• Custom Paint and Finish Systems
• NEMA 7 Electrics or Other Area Classification
 HL Dryer Specifications

Pressure Multiplier
psig barg
60 4.13 .65
70 4.83 .74
80 5.52 .83
90 6.21 .91
100 6.89 1
110 7.58 1.05
120 8.27 1.10
130 8.96 1.16
140 9.65 1.20
150 10.34 1.28
Capacity Correction Factors 175 12.06 1.34
200 13.78 1.43
225 15.51 1.51
250 17.24 1.59

Dimensions Unit Shipping Maximum

SCFM @ Line Size LxDxH Weight Pressure
Model 100 PSIG (Inches) Electrics (Inches) (lbs) (PSIG)
HL15 15 ½ 120V/1/60 22 x 14 x 48 135 150
HL25 25 ½ 120V/1/60 22 x 14 x 60 155 150
HL50 55 ½ 120V/1/60 24 x 18 x 60 220 150
HL75 75 1 120V/1/60 28 x 24 x 86 335 150
HL100 100 1 120V/1/60 27 x 30 x 79 425 150
HL130 130 1 120V/1/60 27 x 30 x 79 465 150
HL200 200 1½ 120V/1/60 31x 32 x 82 685 150
HL250 250 1½ 120V/1/60 30 x 32 x 90 755 150
HL300 300 1½ 120V/1/60 31 x 32 x 90 800 150
HL400 400 2 120V/1/60 32 x 38 x 93 1,000 150
HL550 550 2 120V/1/60 32 x 36 x 93 1,235 150
HL650 650 2 120V/1/60 32 x 36 x 93 1,360 150
HL800 800 2 120V/1/60 38 x 38 x 93 1,645 150
HL1000 1000 3FL 120V/1/60 46 x 56 x 93 2,365 150
HL1250 1250 3FL 120V/1/60 84 x 64x 100 3,530 150
HL1500 1500 3FL 120V/1/60 90 x 64 x 99 3,925 150
HL2000 2000 4FL 120V/1/60 96 x 84 x 123 5,315 150
HL2600 2600 4FL 120V/1/60 96 x 84 x 126 6,205 150
HL3000 3000 4FL 120V/1/60 96 x 84 x 126 6,575 150
HL4000 4000 6FL 120V/1/60 108 x 107x 112 11,055 150
HL5000 5000 6FL 120V/1/60 129 x 128 x 117 11,740 150
Specifications subject to change without notice.
Sizing based on the Compressed Air and Gas Institute CAGI ADF 200 Standard for Compressed Air of 100 PSIG inlet pressure,
100 degrees F inlet temperature and -40 degrees F pressure dew point providing ISO Quality to standard 8573-1 rating 1-2-1
for Compressed Air Quality.
Inlet temperatures to 120º F (49º C)
200 - 1000 psig unit available.
 HLD Low Dew Point Dryer

EAP HLD Dryers are designed to provide -100° F pressure

dew point for a variety of applications and industries such as
Petrochemical, Microprocessor, Semi-conductor’ Electronics,
Food and Beverage, Gas Separation, Pharmaceutical,
Medical, laboratory and Prosthetics, and not to mention ultra-
low ambient temperature applications. To achieve these low
dew points, EAP has developed a unique solution in a heatless
desiccant dryer.

Standard Equipment

• -100º F Pressure Dew Point • Led Valve Position Indicator

• Allan Bradley PLC Controller • Three - Year Warranty on Switching Valves
• Four- Line Display • Factory Installed Filters
• NEMA 4X Control Enclosure • Hard Point Mounting for Installation Integrity
• Selectable Cycles • Delta PSI Gauges Filters For Element Condition
• Cycle Stop • Pre - Filter Timer Drain
• cETLus Approved Control Panel • Optimum Factory Pre-Set Purge Regardless Of
• E-Z Switching Valves Operating Pressure
• Three - Way Inlet Valve Reduces Number of Valves • Regulated Purge (Hl100 & Larger)
• Soft Switching for Extreme Valve Life • Independent Re-Pressurization Circuit

Optional Equipment
• Dual Filter And By-Pass Packages • Modbus And Other Communication Protocols
• High Pressure (200-1000 Psig) • Custom Designs
• EcoTronic Dew Point Demand Control • Consult Factory For Additional Options
• Custom Paint And Finishes • Differential Pressure Gauges And Transmitters
• NEMA 7 Electrics Or Other Area Classifications • 304 Stainless Steel Control Tubing With Swagelok Fitting

HLD Specifications

Dimensions Unit Shipping Maximum

SCFM @ Line Size LxDxH Weight Pressure
Model 100 PSIG (Inches) Electrics (Inches) (lbs) (PSIG)
HLD15 15 ½ 120V/1/60 22 x 14 x 52 265 150
HLD25 25 ½ 120V/1/60 23 x 18 x 54 345 150
HLD50 55 ½ 120V/1/60 24 x 32 x 86 510 150
HLD75 75 1 120V/1/60 24 x 32 x 82 625 150
HLD100 100 1½ 120V/1/60 42 x 32 x 87 780 150
HLD130 130 1½ 120V/1/60 42 x 32 x 87 780 150
HLD200 200 1½ 120V/1/60 42 x 32 x 87 930 150
HLD300 300 2 120V/1/60 50 x 36 x 101 1180 150
HLD400 400 2 120V/1/60 50 x 36 x 101 1420 150
HLD550 550 2 120V/1/60 66 x 82 x 102 1860 150
HLD650 650 2 120V/1/60 66 x 82 x 102 2480 150
HLD800 800 2 120V/1/60 66 x 82 x 102 2480 150
HLD1000 1000 3FL 120V/1/60 66 x 82 x 107 2800 150
HLD1250 1250 3FL 120V/1/60 88 x 74 x 101 3510 150
HLD1500 1500 3FL 120V/1/60 86 x 83 x 109 4280 150
HLD2000 2000 4FL 120V/1/60 119 x 107 x 93 6800 150
 HOF Oil Field Construction

EAP Heatless Oil Field (HOF) air dryers provide clean,

dry compressed air resulting in improved air system
operation and unparalleled reliability and safety in an
often-unforgiving environment. The rugged design
provided standard features that are either not available
on competitive brands or require customer modification
that proves unreliable and difficult to service as equipment
ages.

HOF dryers are the result of many years of experience providing quality compressed air to
our oil and gas partners and is a product specifically designed for instrument air and utility
process requirements.

Optional NEMA 7 Enclosure

Standard Control Panel Optional Ecotronic Demand Control

with Digital Dew Point Readout

Standard Equipment

• Inlet Air Temperature To 120º F • Factory Mounted Filters

• Dew Point To -60º F or Lower • NEMA 4X Control Panel Enclosure
• 50% Less Moving Parts • Regulated Adjustable Purge
• Simplified Operation With Intuitive Digital Display • Regulated Control Air
• Exclusive Visual Led Indication Of Valve Status • Separate Re-Pressurization Circuit (100 SCFM And
• Schedule 80, A106b Seamless Piping, 3000# A105 Fittings Larger)
• 1000 Psig Non Lubricated Inlet Valve With High Cycle Life • OSHA Approved Mufflers
• PLC Digital Controller (UL Listed) By Allen Bradley • CRN Approved Safety Valves
• Two Selectable Modes of Operation; Standard Cycle • Stainless Steel Needle Control Valve (HOF-15 To
-40º F PDP, Low Dew Point Mode For -58º F or Lower HOF-75)
• Four-Line Digital Display • Stainless Steel Control Tubing And 316 Stainless
• Quality Materials of Construction Steel Compression Fittings
• ASME / CRN Approved Pressure Vessels (100 SCFM And Larger)
• 2.5 Stainless Steel Angle Seat Exhaust Valves
• ASME /CRN Pressure Vessels (HOF100-800)
• cETLus Compliant Control Panels

Optional Equipment

• ASME / CRN Pressure Vessels HOF-15 to HOF-75 • NEMA 7 Construction

• Non Yellow Material Of Construction (Stainless Steel / • Class 1 Div. 2 Group C & D
Nickel Plated Valves) • Class 1 Div. 1 Group C & D
• EcoTronic Dew Point Demand Control Monitoring • Cyclic Service Rated Tanks
System with 4-20 mA Outputs
 HOF Specifications

Dimensions Unit Shipping Maximum

SCFM @ Line Size LxDxH Weight Pressure
Model Electrics
100 PSIG (Inches) (Inches) (lbs) (PSIG)
HOF-15 15 ½ 120V/1/60 22 x 14 x 52 175 200
HOF-25 25 ½ 120V/1/60 22 x 14 x 52 200 200
HOF-40 40 ½ 120V/1/60 25 x 18 x 59 355 200
HOF-75 75 1 120V/1/60 24 x 32 x 78 440 200
HOF-100 100 1 120V/1/60 24 x 32 x 78 455 150
HOF-125 125 1 120V/1/60 24 x 32 x 78 485 150
HOF-200 200 1½ 120V/1/60 29 x 32 x 80 690 150
HOF-250 250 1½ 120V/1/60 29 x 32 x 89 780 150
HOF-300 300 1½ 120V/1/60 29 x 32 x 89 830 150
HOF-400 400 2 120V/1/60 32 x 36 x 91 1,040 150
HOF-500 500 2 120V/1/60 32 x 36 x 92 1,270 150
HOF-600 600 2 120V/1/60 32 x 36 x 92 1,450 150
HOF-800 800 2 120V/1/60 39 x 38 x 92 1,690 150
Specifications are subject to change without notice.
Sizing based on the Compressed Air and Gas Institute CAGI ADF 200 Standard for Compressed Air of 100 PSIG inlet pressure, 100 degrees F inlet temperature and
-40 degrees F pressure dew point providing ISO Quality to standard 8573-1 for Compressed Air Quality.
Inlet temperatures to 120º F (49º C)
 HHP High Pressure

EAP’s HHP high pressure heatless dryers

are specially designed for higher pressure
applications. They are available in three
specific designs rated for maximum
working pressures of 250, 500, and 1000
PSIG. Desiccant loading, contact time
and velocities are specifically adjusted for
these high pressure conditions. All HHP
dryers utilize a 1000 PSIG stainless steel
non lubricated thee way inlet valve with
high cycle life and actuated ball valves
are used for exhaust. The HHP line is not
simply a modified HL dryer, but a dryer designed and built to withstand higher pressure applications.

25-1000 SCFM @ 250 PSIG

50-5,200 SCFM @ 500 PSIG
75-1,800 SCFM @ 1,000 PSIG

Standard Equipment

• Dew Point To -40º F Or Lower • cETLus Compliant

• 50% Less Moving Parts • Factory Mounted Filters
• Simplified Operation With Intuitive Digital Display • NEMA 4X Control Panel Enclosure
• Exclusive Visual Led Indication Of Valve Status • Regulated Adjustable Purge And Control Air
• Schedule 80, A106B Seamless Piping, 3000# A105 Fittings • Separated Re-Pressurization Circuit (100 SCFM and Larger)
• 1000 Psig Non Lubricated Inlet Valve With High Cycle Life • OSHA Approved Mufflers
• PLC Digital Controller (UL Listed) By Allen Bradley • ASME / CRN Approved Safety Valves
• Four-Line Digital Display • Stainless Steel Needle Control Valve (HHP-15 To HHP-75)
• Quality Materials Of Construction • Stainless Steel Control Tubing And 316 Stainless Steel
• ASME / CRN Approved Pressure Vessels (100 SCFM and Compression Fittings
Larger)
• 2.5” Stainless Steel Liquid Filled Pressure Gauges On
Each Tower (CRN Registered)

Optional Equipment

• ASME / CRN Pressure Vessels HOF-15 To HOF-75 • NEMA 7 Construction

• Non Yellow Material Of Construction (Stainless Steel / • Class 1 Div. 2 Group C & D
Nickel Plated Valves) • Class 1 Div. 1 Group C & D
• EcoTronic Dew Point Demand Control Monitoring • Cyclic Service Rated Tanks
System With 4-20 mA Outputs
 HHP Specifications

250 MAWP 500 MAWP 1000 MAWP

25-1000 SCFM 50-5200 SCFM 75-1800 SCFM
SCFM @ Line Size SCFM @ Line Size SCFM @ Line Size
Model 100 PSIG (Inches) Model 100 PSIG (Inches) Model 100 PSIG (Inches)
HHP-25-3 25 ½ HHP-50-5 50 ½ HHP-75-10 75 ½
HHP-55-3 55 ½ HHP-95-5 55 ½ HHP-130-10 130 ½
HHP-140-3 140 ¾ HHP-200-5 140 ¾ HHP-250-10 250 ¾
HHP-250-3 250 1 HHP-350-5 250 1 HHP-400-10 400 1
HHP-300-3 390 1½ HHP-550-5 390 1½ HHP-750-10 750 1½
HHP-570-3 570 1½ HHP-800-5 570 1½ HHP-1000-10 1000 1½
HHP-1000-3 1000 2 HHP-1400-5 1000 2 HHP-1800-10 1800 2

Specifications are subject to change without notice.

All systems are provided with Engineered Air Tuned Regeneration along with the Purge Saver Energy Management System
resulting in maximum KW savings based on air usage.
 18 Month Bumper to Bumper Warranty
3 Year Warranty on Blower, Heater and 3 way Switching Valve

ISO 8573.1:2010 DIRT WATER OIL

Quality Class Maximum Number Pressure Dewpoint ºC (including vapour)
of Particle Size per (ppm. Vol.) at 7 bar g mg/m3
m3 in micron
0 As specified by equipment or supplier. More stringent than Class 1.

1 <20,000 0.1-0.5 -70 (0.3) 0.01

2 <400,000 0.1-0.5 -40 16) 0.1
3 <90,000 0.5-1.0 -20 (128) 1.0
4 <10,000 1.0-5.0 +3 (940) 5
5 <100,000 1.0-5.0 +7 (1240) 25
6 +10 (1500) -
HL Series meet ISO 8573-1 Air Quality of 1.3.1
Air Compressor Optional Optional
HL SERIES
Wet Receiver Dry Receiver

Since all HL Series Dryers are provided with factory mounted filtration and drain systems, installation is a snap.

EAP
©2020 Engineered Air Products, Lancaster, NY 14086

800.943.7924 • www.engineeredairproducts.com