Sullair DHL-80 Troubleshooting guide

Failure to follow the instructions
and procedures in this manual or,
misuse of this equipment will
VOID its warranty!
WARRANTY NOTICE
USER/SERVICE MANUAL
DESICCANT HEATLESS REGENERATIVE
COMPRESSED AIR DRYERS
DHL-80 TO DHL-5000
PART NUMBER:
KEEP FOR
FUTURE
REFERENCE
©SULLAIR CORPORATION
02250195-403 R00
The information in this manual is current
as of its publication date, and applies to
compressor serial number:
and all subsequent serial numbers.
SHDIDFAA-0001

AIR CARE SEMINAR TRAINING
Sullair Air Care Seminars are courses that provide hands-on instruction for the proper operation, maintenance,
and servicing of Sullair products. Individual seminars on Industrial compressors and compressor electrical
systems are offered at regular intervals throughout the year at Sullair’s corporate headquarters training facility
located at Michigan City, Indiana.
Instruction includes training on the function and installation of Sullair service parts, troubleshooting common
faults and malfunctions, and actual equipment operation. These seminars are recommended for maintenance,
contractor maintenance, and service personnel.
For detailed course outlines, schedule, and cost information contact:
SULLAIR TRAINING DEPARTMENT
1-888-SULLAIR or
219-879-5451 (ext. 5623)
www.sullair.com
[email protected]
- Or Write -
Sullair Corporation
3700 E. Michigan Blvd.
Michigan City, IN 46360
Attn: Service Training Department.

TABLE OF CONTENTS
SECTION 1—INTRODUCTION
5 1.1 IDENTIFICATION PLATE
5 1.2 WARRANTY CONDITIONS
SECTION 2—SAFETY
7 2.1 SAFETY INFORMATION
8 2.2 DEFINITION OF THE SAFETY SYMBOLS USED
10 2.3 WARNINGS
10 2.4 PROPER USE OF THE DRYER
11 2.5 INSTRUCTIONS FOR THE USE OF PRESSURE EQUIPMENT
SECTION 3—INSTALLATION
13 3.1 TRANSPORT
13 3.2 INSTALLATION SITE
14 3.3 INSTALLATION LAYOUT
15 3.4 OPERATING CONDITIONS
15 3.5 CONNECTION TO THE COMPRESSED AIR SYSTEM
15 3.6 CONNECTION TO THE ELECTRICAL SUPPLY
15 3.7 INLET FILTER CONDENSATE DRAIN
SECTION 4—STARTUP
17 4.1 PRELIMINARY OPERATION
17 4.2 FIRST START-UP
18 4.3 OPERATION AND SWITCHING OFF
SECTION 5—TECHNICAL SPECIFICATIONS
SECTION 6—TECHNICAL DESCRIPTION
21 6.1 CONTROL PANEL
21 6.2 DESCRIPTION OF OPERATION
23 6.3 OPERATION
23 6.4 PURGE METERING VALVE SETTINGS

TABLE OF CONTENTS
25 6.5 CYCLE DESCRIPTION
27 6.6 CONTROL PANEL
30 6.7 OPERATION CONFIGURATION
32 6.8 POWER SELECTOR
32 6.9 DIP-SWITCHES
34 6.10 OPERATING CYCLES
37 6.11 TEST
38 6.12 MAINTENANCE (SERVICE)
38 6.13 FUSES
38 6.14 DEWPOINT METER— (OPTIONAL)
39 6.15 PDP ANALOG SIGNAL
40 6.16 PRESSURE SWITCHES OF “FAIL TO SWITCH ALARM”— (OPTIONAL)
41 6.17 CALIBRATION PRESSURES
SECTION 7—MAINTENANCE, TROUBLESHOOTING, SPARES AND DIS-
MANTLING
43 7.1 CONTROLS AND MAINTENANCE
44 7.2 TROUBLESHOOTING
46 7.3 DISMANTLING OF THE DRYER
SECTION 8—ATTACHMENTS
48 8.1 ID—DHL80-125
50 8.2 ID—DHL150-200
52 8.3 ID—DHL250-300
54 8.4 ID—DHL400-600
56 8.5 ID—DHL800-1000
58 8.6 ID—DHL1250-1500
60 8.7 ID—DHL2000
62 8.8 ID—DHL2500-3000
64 8.9 ID—DHL3500-4000
66 8.10 ID—DHL4000-5000
68 8.11 P&I—DHL80-125
70 8.12 WD—DHL80-5000
72 8.13 SPARE PARTS LIST

Section 1
5
DHL HEATLESS REGENERATIVE DRYER
INTRODUCTION
Thank you for choosing our product. In order to get
the best performances from this product, please read
this manual carefully. To avoid damage to the
equipment and physical risk to the operator, please
read and strictly follow the instructions contained in
this manual. Note, these instructions are in addition
to the Local and Federal safety rules that apply
where the dryer is installed.
Before packing for shipment eachDHL series
heatless adsorption air dryer is subjected to rigorous
testing to demonstrate that the device can perform
all the functions for which it has been designed.
Once the dryer has been properly installed according
to the instructions in this manual, it will be ready for
use without any further adjustment. The operation is
fully automatic, and the maintenance must be
performed regularly, as detailed in the following
chapters.
This manual should be kept available for future
reference and is intended to be an important tool
in the proper operation and maintenance of the
dryer.
Due to the continuous technical evolution, we
reserve the right to introduce any necessary change
without giving previous notice.
Should you experience any trouble, or for further
information, please do not hesitate to contact us.
1.1 IDENTIFICATION PLATE
The product identification plate shows all the primary
data of the machine. Upon installation, fill in the table
shown on the side copying the data shown on the
identification plate. Refer to this datawhen ordering
parts or requesting service, even during the warranty
period.
Removal or alteration of the identification plate will
void the warranty
1.2 WARRANTY CONDITIONS
For 12 months from the installation date, but no
longer than 18 months from the delivery date, the
warranty covers eventual faulty parts, which will be
repaired or replaced free of charge.
The warranty doesn’t cover any responsibility for
direct or indirect damages to persons, animals or
equipment caused by improper usage or
maintenance, and it’s limited to manufacturing faults
only.
Model
Serial No.
Code Heatless Regenerative Dryer
Nominal Flow Rate SCFM
Max. Air Pressure 150 PSIG
Max. Inlet Air
Temperature 100°F
Ambient
Temperature 100°F
Dessicant
(type and Qty) Activated Alumina
Electric Supply 115/110/1/50,60 208/220/1/
50,60
Electric Nominal
Power 10W
Fuse Max. 1 AMP
Manufactured —

DHL HEATLESS REGENERATIVE DRYER SECTION 1
6
The right to warranty repairs is subordinated to the
strict compliance with the installation, use and
maintenance instructions contained in this manual.
The warranty will be immediately voided in case of
even small changes or alterations to the dryer.
To request repairs during the warranty period, the
data reported on the identification plate must be
notified.
Table 1-1: Dryer Specifications
IT IS RECOMMENDED TO FILL OUT THIS SECTION AT INITIAL START UP OF THE DRYER.
Model No. ____________________________________ Desiccant/Tower: ____________ LBS ____________
Serial No. ____________________________________ Inlet/Outlet Size: ____________ NPT ____________
Inlet Design Conditions: _________________________ Cycle Time: ___________ Standard Short Cycle _______
Flow: ________________________SCFM@
Pressure: ___________ 100 ________PSIG Maximum Operating Pressure: ________________ PSIG
Temperature: ________ 100 ________°F Minimum Operating Pressure: ________________ PSIG
Outlet Dew Point: _________°F PDP @ Above Conditions Maximum Operating Temperature: _________________°F
Purge Flow: __________ PSIG/SCFM _____________ Minimum Operating Temperature: _________________°F
Power Supply: _________V_________PH_________HZ
Current Draw: _____________ AMP ________________
1. This pressure is 95% of MAWP
2. Operating at “OFF” design conditions may adversely affect Outlet Dew Point.
3. Operation of dryer below 35°F requires heat tracing of certain components upstream of dryer outlet.

Section 2
7
SAFETY—REGENERATIVE DRYERS
SAFETY
The dryer has been designed and constructed in
accordance with the generally recognized rules
pertaining to adsorption technology as well as
industrial safety and accident prevention regulations.
The equipment design, development, production,
assembly and customer service fall under the Sullair
quality control system.
The dryer is state of the art. There are, however,
hazards to the body, equipment and life
accompanying this type of product if it is not operated
for the purpose which it is intended by trained and
specialized personnel.
The equipment supplied is intended exclusively for
drying compressed air. Any other use or one
exceeding this is considered unauthorized. Sullair
cannot be held liable for damages resulting from
incorrect or unauthorized use of the equipment. Any
such risk is carried solely by the end user.
Authorized use means complete compliance with all
of the conditions of operation, servicing and
maintenance prescribed by Sullair in this Instruction
and Operation Manual.
The dryer is only to be operated, serviced and
repaired by trained personnel who are familiar with
this type of equipment and understand fully its
operation and any potential dangers.
2.1 SAFETY INFORMATION
The end user and operator must observe all National,
State, and Local industrial and safety regulations
dealing with the operation of pressure vessels under
compressed air service. Also all “end user” safety
rules for the same type of service must be adhered
to. The following points list some of the important
factors dealing with this type of equipment.
• Never make any structural changes to the
equipment
• Use only original spare parts and accesso-
ries
• Never weld on any pressure vessel or mod-
ify it in any way
• All maintenance on “pressure parts” must
be carried out with the equipment shut-
down, depressurized and locked out. Any
in plant procedures or work permits regard-
ing pressure vessels are to be adhered to.
• Do not operate the equipment with the con-
trol panel door open, the electrical system
energized and live parts exposed.
• Disconnect the dryer from the electrical
supply when any electrical work is per-
formed. Lock out the safety disconnect and
obtain any required work permits.
The desiccants used in this equipment are not
considered hazardous. However all contact with or
disposal of the desiccant should be in accordance
with the relevant MSDS. The following lists the more
common safety measures normally observed during
filling operations.
• In the case of accidental contact of the des-
iccant with the eyes, rinse immediately with
an abundance of clean water. Refer to the
MSDS.
• Accidental spillage of desiccant on the floor
should be cleaned up avoiding the creation
of excess dust during this procedure.
• Use a contoured face mask during any fill-
ing or draining operations. Refer to the
MSDS.

8
NOTES
2.2 DEFINITION OF THE SAFETY SYMBOLS USED
Before attempting any intervention on the dryer, read carefully the instructions reported
in this use and maintenance manual.
General warning sign. Risk of danger or possibility of damage to the machine. Read
carefully the text related to this sign.
Electrical hazard. The relevant text outlines conditions which could result fatal. The
related instructions must be strictly respected.
Danger hazard. Part or system under pressure.
Danger hazard. Component or system which during the operation can reach high
temperature.
Danger hazard. It’s absolutely forbidden to breathe the air treated with this apparatus.
Danger hazard: It’s absolutely forbidden to use water to extinguish fire on the dryer or in
the surrounding area.
Danger hazard; It’s absolutely forbidden to operate the machine when the parts (under
pressure or electric panels) are not in place or have been tampered with and changed.
Danger hazard: machine level noise could be higher than 85 dBA. It is mandatory to
install the machine in dedicated area where people are not normally present. The
installator and/or the user is responsible for correct installation of the dryer, in order to
prevent noise propagation to the near work environment. The installator and/or the user
is also responsible for the safety signs affixing into installation site.
Attention: the User or Operator must wear hearing protection before performing any
procedure on the dryer. All personnel must select the proper PPD (Personal Protection
Device) hearing protector (earmuffs, ear canal caps or ear plugs) in order to prevent
damage to the person's hearing.

SECTION 2 SAFETY—REGENERATIVE DRYERS
9
Maintenance and/or control operation to be very carefully performed by qualified
personnel 1.
Compressed air inlet connection point.
Compressed air outlet connection point.
Condensate drain connection point.
Operations which can be worked out by the operator of the machine, if qualified 1.
In designing this unit a lot of care has been devoted to the protection of the
environment:
• Dryer and relevant packaging composed of recyclable materials.
• Energy saving design.
Not to spoil our commitment, the user should follow the few ecological suggestions
marked with this sign.
NOTE
Text to be taken into account, but not
involving safety precautions.

SAFETY—REGENERATIVE DRYERS SECTION 2
10
2.3 WARNINGS
2.4 PROPER USE OF THE
DRYER
This dryer has been designed, manufactured and
tested only to be used to separate the humidity
normally contained in compressed air. Any other use
has to be considered improper. The Manufacturer
will not be responsible for any problem arising from
improper use; the user will be in any case
responsible for any resulting damage.
Moreover, the correct use requires the compliance
with the installation conditions, in particular:
• Voltage and frequency of the primary elec-
trical supply.
• Pressure, temperature and flow-rate of the
incoming air.
• Ambient temperature.
This dryer is supplied tested and fully assembled.
The only operation left to the user is the installation of
the desiccant into the dryer towers and the
connection to the plant in compliance with the
instructions given in the following chapters.
The purpose of the machine is the
separation of water present in
compressed air. The dried air cannot be
used for respiration purposes or for
operations leading to direct contact with foodstuff,
unless subject to further treatments.
Compressed air is a highly hazardous energy source. Never work on the dryer with
parts under pressure. Never point the compressed air or the condensate drain jet
towards anybody.
The user is responsible for the installation of the dryer, which has to be executed on the
basis of the instructions given in the “Installation” chapter. Otherwise, the warranty will
be voided and dangerous situations for the personnel and/or damages to the machine
could occur.
Only qualified personnel can use and service electrically powered devices. Before
attempting any maintenance action, the following conditions must be satisfied :
• Ensure that any part of the machine is under voltage and that it can-
not be connected to the mains.
• Ensure that any part of the dryer is under pressure and that it cannot
be connected to the compressed air system.
Any change to the machine or to the relevant operating parameters, if not previously
verified and authorised by the Manufacturer, in addition to create the possibility of
dangerous conditions it will void the warranty.
Don’t use water to extinguish fire on the dryer or in the surrounding area.

SECTION 2 SAFETY—REGENERATIVE DRYERS
11
2.5 INSTRUCTIONS FOR THE
USE OF PRESSURE
EQUIPMENT
To ensure the safe operation of pressure
equipments, the user must conform strictly to the
following:
1. The equipment must only be operated within
the temperature and pressure limits stated
on the manufacturers name/data plate.
2. No welding is allowed on the shell and end
caps.
3. The equipment must not be stored in badly
ventilated spaces, near a heat source or
inflammable substances.
4. Vibration must be eliminated from the equip-
ment to prevent fatigue failure.
5. An internal inspection must be carried out at
12 month intervals to check for pressure
equipment corrosion. The actual wall thick-
ness of the tower after corrosion should not
be less than the data indicated on the chart
located on the side on the tower.
6. Condensate drains should be checked for
operation every day to prevent a build up of
condensate in the pressure equipment.
7. The maximum working pressure stated on
the manufacturers data plate must not be
exceeded.
8. All documentation supplied with the equip-
ment (manual, declaration of conformity etc.)
must be kept for future reference.

12
NOTES

Section 3
13
DHL HEATLESS REGENERATIVE DRYER
INSTALLATION
3.1 TRANSPORT
Once verified the integrity of the packaging, place the
unit near to the installation point and unpack the
contents.
• To move the packaged unit we suggest to
use a suitable crane or forklift. We do not
recommend using hands.
• Handle with care. Improper handling could
cause irreparable damage.
• Even when packaged, keep the machine
protected from severity of the weather.
3.2 INSTALLATION SITE
Particular care is required in selecting the
installation site, as an improper location
could jeopardise the proper operation of
the dryer.
This unit is not suitable to be used in explosive
atmosphere, where risk of fire could exist, or in
presence of gaseous or solid polluting material.
Don’t use water to extinguish fire on the
dryer or in the surrounding area.
Machine level noise could be higher than
85 dBA. It is mandatory to install the
machine in dedicated area where people
are not normally present. The installator
and/or the user is responsible for correct installation
of the dryer, in order to prevent noise propagation to
the near work environment. The installator and/or the
user is also responsible for the safety signs affixing
into installation site.
Maintenance personnel must wear
hearing protection while operating the
dryer. Each employee must select proper
PPD (Personal Protection Device)
hearing protector (earmuffs, ear canal
caps and earplugs) in order to prevent discomfort or
damage to the operator’s hearing.
Minimal installation requirements:
• Select a clean room dry, free from dust,
and protected from atmospheric distur-
bances.
• The supporting area must be smooth, level
and able to hold the weight of the dryer.
• Minimum ambient temperature 34ºF, 1ºC.
• Maximum ambient temperature 120ºF, 5ºC.
• Allow at least a clearance of 3 feet (1
meter) on each side of the dryer to facilitate
possible maintenance operations.
• The dryer is required to be fixed to the sup-
porting surface.
The packaging materials
are recyclable. Each single
material must be properly
disposed in a manner
complying with the rules in
force in the destination
country.

DHL HEATLESS REGENERATIVE DRYER SECTION 3
14
3.3 INSTALLATION LAYOUT
Dryer is supplied with 0.01 micron filter on
the inlet and a 1 micron filter on the outlet.
Type A installation is suggested when the
compressed air treated from the dryer is only a part
of the total flow rate of the compressor; or when the
compressor operates at reduced intermittence and
the total consumption equals the compressor flow
rate.
Figure 3-1: Recommended Installation
Table 3-1: Correction Factor for inlet Pressure
PSIG 50 60 70 80 90 100 110 120 130 140 150 175 200 225 250
BAR 3.5 4.1 4.8 5.5 6.2 6.9 7.6 8.3 9.0 9.7 10.3 12.1 13.8 15.5 17.3
F1 Factor 0.56 0.65 0.74 0.83 0.91 1.0 1.06 1.08 1.12 1.16 1.2 1.29 1.37 1.45 1.52
Table 3-2: Correction factor for Inlet Temperature
°F 70 80 90 100 105 110 115 120
°C 21 27 32 38 40 43 46 49
F2 Factor 1.12 1.09 1.06 1.0 0.93 0.86 0.80 0.75

SECTION 3 DHL HEATLESS REGENERATIVE DRYER
15
3.4 OPERATING CONDITIONS
• Maximum working pressure 150 PSIG (10
Bar) for higher pressure contact factory.
• Minimum working pressure 60 PSIG (4 bar)
• Maximum inlet temperature 120°F (49°C)
• Minimum ambient temperature: 34°F
(1.6°C) for lower ambient temperature con-
tact factory.
EXAMPLE:
A ( DHL-250) has a nominal capacity of 250 SCFM.
What is the maximum allowable flow through the
dryer at following operating conditions?:
Air Inlet Pressure: 110 Psig (7.6 Bar) From table for
pressure correction F1=1.04
Air Inlet temperature: 105°F (40°C) From table for
temperature correction F2=0.93
3.5 CONNECTION TO THE
COMPRESSED AIR SYSTEM
Operations to be performed by qualified
personnel. Connections to be performed
by qualified personal. Never do service
with dryer under pressure.
The user is responsible to ensure that the dryer will
never be operated with pressure exceeding the
nominal values. Eventual over-pressure could be
dangerous both for the operator and the machine.
The temperature and the amount of air entering the
dryer must comply with the limits reported on the
data plate. In the event of particularly high inlet
temperatures, the installation of additional cooling
equipment such as water cooled after cooler or
refrigerated after cooler may be necessary. The air
supply piping should be free from dust, rust, ships
and other debris and must be sized to consistent with
the flow- rate of the dryer.
In designing the dryer, particular measures have
been taken in order to limit the vibration which could
occur during the operation. Therefore we
recommend to use connecting pipes able to insulate
the dryer from possible vibrations originating from the
line (flexible hoses, vibration damping fittings, etc.).
3.6 CONNECTION TO THE
ELECTRICAL SUPPLY
The connection to the electrical supply, to
be carried out by qualified personnel, and
the safety systems must comply with
local rules and laws.
Before connecting the unit to the electric power,
verify that the voltage and the frequency available on
the electrical supply correspond to the data reported
on the data plate of the dryer. In terms of voltage, a
±5% tolerance is allowed. The dryer comes with a
mains connecting cable already installed (6 ft ).
The electrical power supply must have a breaker
equipped with ground fault protection.
The sizing of the electrical supply wiring should be
properly sized for the electrical specification for the
dryer model being installed. The ambient
temperature, voltage, length of wiring and all
applicable local electrical codes should all be
considered whe sizing the electrical wiring.
It is mandatory to ensure the connection to
the ground terminal.
3.7 INLET FILTER CONDENSATE
DRAIN
The condensate is discharged at the same
pressure of the air entering the dryer.
Never point the condensate drain jet
towards anybody.
The dryer is already supplied with ¼” flexible hose to
be connected to the Collecting device (Oil/water
separator).
Connect and properly fasten the condensate drain to
a collecting plant or container.
The drain cannot be connected to pressurised
systems.
Table 3-3: Sizing a Dryer—How to find the air flow capacity
Air Flow Capacity = Nominal Capacity of Dryer X Factor F1 X Factor F2
Table 3-4: Example Solution
241.8 (Air Flow Capacity) = 250 SCFM X 1.04 (F1) X 0.93 (F2)
Air Flow Capacity= 241.8 SCFM. This is the maximum air flow rate that the dryer can accept under those operating conditions.

DHL HEATLESS REGENERATIVE DRYER SECTION 3
16
Don’t dispose the condensate in the
environment.
The condensate collected in the dryer
contains oil particles released in the air
by the compressor.
Dispose the condensate in compliance with the local
rules.
Sullair recommends the installation of an oil/water
separator to treat the condensate being drained from
the compressors, dryers, filters, receivers, etc.

Section 4
17
DHL HEATLESS REGENERATIVE DRYER
STARTUP
4.1 PRELIMINARY OPERATION
Verify that the operating parameters
match with the nominal values reported
on the data plate of the dryer (voltage,
frequency, air pressure, air temperature,
ambient temperature, etc.).
Before delivery, each dryer is submitted to accurate
tests simulating real operating conditions.
Nevertheless, the unit could be damaged during
transportation. We therefore suggest to check the
integrity of the dryer upon arrival and to keep it under
observation during the first hours of operation.
The start-up must be performed by
qualified personnel.
It’s mandatory that the engineer in
charge will adopt safe operational
conditions complying with the local safety and
accident prevention requirements.
The same engineer will be responsible
for the proper and safe operation of the
dryer.
Never operate the dryer if its panels are
not in place.
4.2 FIRST START-UP
At the first start-up, or in case of start-up
after a long inactivity period or following
to maintenance operations, comply with
the instructions given below. The start-up
must be performed by qualified
personnel.
Maintenance personnel must wear
hearing protection while operating the
dryer Each employee must select proper
PPD (Personal Protection Device)
hearing protector (earmuffs, ear canal
caps and earplugs) in order to prevent any
discomfort or damage to the operator’s hearing.
SEQUENCE OF OPERATIONS:
• Verify that the factory settings, indicated in
the plate “REMOVE BEFORE THE 1ST
START UP” (on the control panel), match
the real operating conditions requested.
• Verify that all the steps of the “Installation”
chapter have been observed.
• Verify that the connection to the com-
pressed air system is correct and that the
piping is suitably fixed.
• Verify that the condensate drain pipe is
properly fastened and connected to a col-
lection system or container.
• Remove any packaging and other material
which could obstruct the area around the
dryer.
• Pressurize the dryer slowly.
• Close the breaker for the electrical supply.
• Verify that the control panel is on.
• Check the piping for air leakage.
• Test the drain of the inlet filter.
• After 2 minutes from the start-up the
adsorption tower B is depressurized.
• Wait for the dryer to make a few cycles
(there is an alternation of depressurization
from tower A to tower B)
• The cycle is inverted every 2 minutes
(DewPoint of -94ºF/-70°C) or every 4 min-
utes (DewPoint of -40ºF/-40°C) or every 7
minutes (DewPoint of -4ºF/-20°C); it
depends on the dryer set-up.

DHL HEATLESS REGENERATIVE DRYER SECTION 4
18
4.3 OPERATION AND
SWITCHING OFF
Maintenance personnel must wear
hearing protection while operating the
dryer. Each employee must select proper
PPD (Personal Protection Device)
hearing protector (earmuffs, ear canal
caps and earplugs) in order to prevent any
uneasiness that could cause dangerous situation for
him.
Operation:
• Pressurize the dryer slowly.
• Activate the on/off switch.
• Verify that the control panel is on.
• Wait for the first cycles of the inlet filter
drain or make the drain test manually.
• During the first two minutes both the towers
are pressurized
• Wait for the dryer to make some cycles
(there is an alternation of depressurization
from tower A to tower B).
Switching off:
• Check if the inlet filter condensate drain
works regularly.
• Stop the air flow.
• Depressurize the dryer.
• Deactivate the on/off switch.
NOTE
During the first days of operation, the
DewPoint is not ensured because the
adsorption material can contain humidity.
At the first start-up, or in case of start-up
after a long inactivity period or following
the maintenance operations, we recom-
mend using the dryer at a reduced nomi-
nal flow of 50% during the first two days.
NOTE
During the working of the dryer, both the
towers are cyclically depressurized in
order to be regenerated. The depressur-
ized tower is crossed from part of the
compressed air already dried, which will
be expelled outside. The noise of the
compressed air during the draining is
muffled by silencers.

Section 5
19
DHL HEATLESS REGENERATIVE DRYER
TECHNICAL SPECIFICATIONS
Model#
Inlet
Flow
Capacity
@100 PSIG
(CFM)
Voltage
115/1/60
220/1/50
Inlet/Outlet
Connections
(inches)
Dimensions
L x W x H
(inches)
Weight
(Lbs)
DHL-80 80 115/208 ¾” NPT 32x24x83 550
DHL-100 100 115/208 1” NPT 32x24x83 690
DHL-150 150 115/208 1” NPT 32x24x87 810
DHL-200 200 115/208 1” NPT 32x24x87 850
DHL-250 250 115/208 1 ½” NPT 40x24x87 1010
DHL-300 300 115/208 1 ½” NPT 40x24x87 1200
DHL-400 375 115/208 1 ½” NPT 46x26x88 1350
DHL-500 500 115/208 2” NPT 46x26x88 1460
DHL-600 650 115/208 2” NPT 46x26x88 1790
DHL-800 800 115/208 3” FLG 55x48x105 2150
DHL-1000 1000 115/208 3” FLG 55x48x105 2960
DHL-1250 1250 115/208 3” FLG 60x50x109 3470
DHL-1500 1500 115/208 3” FLG 60x50x109 4180
DHL-2000 2000 115/208 3” FLG 70x62x115 4980
DHL-2500 2500 115/208 4” FLG 70x62x115 5800
DHL-3000 3000 115/208 4” FLG 80x70x120 6400
DHL-4000 4000 115/208 6” FLG 90x80x122 9100
DHL-5000 5000 115/208 6” FLG 98x86x120 11800

20
NOTES