Pneumatech EH Series User manual

Printed in U.S.A. Publication No. OM-A-10H
June 2006 Rev. 7
Owner’s Manual
H
EATLESS
R
EGENERATIVE
D
RYERS
PH SERIES/EH SERIES/PHM MINI SERIES

To receive Extended Warranty, you must regis-
ter on line at: www.pneumatech.com.
Doing this will extend the warranty to 24
months from date of shipment from Company’s
factory. See back page for actual Warranty
details.
DATE OF PURCHASE
MODEL
SERIAL NO.
Record above information from nameplate.
Retain this information for future reference.
Replacement Price $25.00

Pub. No. OM-A-10H REV. 7 — June 2006
1
TABLE OF CONTENTS
Page
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Receiving – Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Disclaimer of Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Desiccant Replacement Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Filling Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Molecular Sieve Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Draining Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Desiccant Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation & Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PH & EH Series Heatless Air Dryer Installation & Operation . . . . . . . . . . . . . . . . . . . . . . . . . 7
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Start-Up Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DMP Microprocessor Control with Cycle Sight™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Shutdown Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PHM Mini Series Heatless Air Dryer Installation & Operation . . . . . . . . . . . . . . . . . . . . . . . . 12
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Start-Up Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operational Observation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
PH & EH Series Heatless Air Dryer Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Daily . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Weekly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Monthly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Three Months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Twelve Months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Dewpoint Sensor (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mufflers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PHM Mini Series Heatless Air Dryer Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Daily . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Weekly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Three Months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Twelve Months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Mufflers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Desiccant Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Desiccant Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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Pub. No. OM-A-10H REV. 7 — June 2006
Dewpoint Display Key Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setpoint Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Open Sensor Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setpoint Limit Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Over Range and Under Range Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Peak/Valley Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Options Listing with Explanation (PH & EH Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Audible Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Failure to Shift Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
High Humidity Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Moisture Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Panel Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PLC Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Dewpoint Demand Control “DPD” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Pub. No. OM-A-10H REV. 7 — June 2006
3
GENERAL INFORMATION
The Pneumatech Drying System is designed to remove
moisture from compressed air.
When properly installed, the unit requires little
maintenance or adjustment.
A list of service parts is provided on the attached parts list.
This manual contains important safety information. Read
THOROUGHLY and follow the Safety Instructions provided
in this manual and posted on the unit. Keep this manual
near the unit and in a safe place. Replace this manual if it
becomes torn or dirty and cannot be properly used.
Please read the Installation & Operation section of this
manual before attempting to operate the unit.
Please read the Maintenance and Troubleshooting
sections of this manual before beginning any maintenance
or service work on this unit.
RECEIVING – INSPECTION
Inspect equipment. Any concealed shipping
damage must be reported to the carrier
immediately. Damage claims should be filed by
the consignee with the carrier.
All the equipment shipped F.O.B. Kenosha, WI becomes
the property of the purchaser. In all cases of damage,
visible or suspected, contact your local distributor or
Pneumatech before attempting to install equipment.
SERVICE INQUIRIES: Provide Model No., Serial No.,
Operating Pressure, Inlet Temperature, Nature of Problem.
See Dryer Specification Tag located on the control panel.
SAFETY INSTRUCTIONS
When using air compressors and compressed air
accessories, basic safety rules and precautions must
always be followed, including the following:
1. READ ALL INSTRUCTIONS FULLY.
2. WIRING & BREAKERS
Wiring, breakers and other electrical equipment
must conform to local and national electrical codes.
Do not operate this unit with damaged wiring or
after the unit or air handling parts have been
dropped or damaged in any manner. Notify
authorized service facility for examination, repair
or other adjustments.
3. USE SUITABLE PARTS & ACCESSORIES
Do not use air pressurized accessories or parts in the
air system not suitable for the maximum air pressure
used. Be sure maximum pressure specified by the
accessory manufacturer is well above the working
pressure of your compressor.
4. RELEASE AIR PRESSURE SLOWLY
Fast moving air will stir up dust and debris, which
may be harmful. Release air pressure slowly when
depressurizing your system to avoid bodily injury.
DO NOT install, operate, maintain, adjust
or service this unit without thoroughly
reading this manual.
Comply with the National Electrical Code,
Federal, State and Local Codes when
installing or operating this unit.

4
Pub. No. OM-A-10H REV. 7 — June 2006
5. SECURE DRAIN LINES
Fasten drain lines from prefilter/separator to floor or
drain. Pressurized air may periodically pass through
drain lines, which will cause an unsecured line to
whip and may cause bodily injury.
To provide safe, breathable air, compressor must be
capable of producing at least Grade D breathing air as
described in Compressed Gas Association Commodity
Specification G7.1-1966. Special filtering, purifying and
associated alarm equipment must be used to convert
compressed air to “Breathing Air.” Other special
precautions must also be taken.
Refer to OSHA 29 CFR 1910.134.
DISCLAIMER OF WARRANTY
If this unit is used to produce breathing air, the special
equipment and precautions expressed in OSHA 29 CFR
1910.134 for specifications of the necessary equipment
and special precautions to make Breathing Air MUST BE
used or any warranties are VOID and manufacturer
disclaims any liability whatsoever for loss, personal injury
or damage.
Air from compressor and from Pneumat-
ech Air Drying System, as equipped, is not
safe for human respiration (breathing).
Connect oil coalescing prefilter with auto-
matic drain before the dryer to prevent
any oil or slugs of water carryover into
the desiccant. Connect particulate afterfil-
ter downstream of the dryer to retain any
desiccant dust flowing into the process air
lines.

Pub. No. OM-A-10H REV. 7 — June 2006
5
DESICCANT REPLACEMENT PROCEDURES
Pneumatech uses Activated Alumina Grade A desiccant
for all standard heatless regenerative air dryers. Dryers up
to 1500 SCFM are factory filled with desiccant. Dryers
1800 SCFM and larger are supplied with loose desiccant
in 50 lb. bags. The dryer must be filled with desiccant
before start-up. Dryers ranging from 5 SCFM to 500
SCFM use 1/8” diameter desiccant. Dryers 650 SCFM
and larger use a mix of 1/8” and 1/4” size desiccant.
See the dryer specification sheet or dryer data tag for
amounts per tower.
FILLING PROCEDURE
For PHM models refer to Page 14.
1. Make sure the dryer is depressurized.
2. Remove the plugs or flanges from the fill ports
located on the top of the pressure vessels.
3. Using a flashlight, inspect the inside of each vessel to
be sure they are empty.
4. Verify that the desiccant drain port located in the
bottom of the pressure vessel is closed tightly.
5. Desiccant is available in 50# bags, or 300# barrels.
Divide the desiccant into equal amounts for each
tower, and verify the correct amount by the
specification tag located on the electrical panel.
Towers can be filled manually with desiccant bags.
A fork lift or overhead crane should be used when
filling with 300# barrels.
6. Dryers 650 SCFM and larger use two sizes of
desiccant. Fill the tower with the 1/4” diameter
Activated Alumina first , followed by 1/8” Activated
Alumina. The large desiccant (1/4” size) is used to
disperse the inlet air flow.
7. Close the fill ports and put the dryer in service. Refer
to the Start-Up Procedure listed in this manual.
MOLECULAR SIEVE OPTION
(LOW DEWPOINT)
Dryers with optional Molucular Sieve are filled with the
Activated Alumina first and the Molecular Sieve last . The
Molecular Sieve is used as a polishing agent to lower the
dewpoint temperature.
NOTE: The proper amount of desiccant may or may not
fill up the vessel to the top.
DRAINING PROCEDURE
The desiccant can be removed by the two methods listed
below. MAKE SURE THE DRYER IS DEPRESSURIZED
PRIOR TO REMOVING THE FILL OR DRAIN PORT.
Method #1 – Remove the drain port and drain the
desiccant into buckets which are then poured into the
proper dumpster or receptacle.
Method #2 – Usually used for large dryers (1000 SCFM
and larger). An industrial dry vacuum cleaner is required
for this method.
1. Remove the desiccant fill port.
2. Using an industrial vacuum cleaner, remove the
desiccant from the vessel.
3. Open the desiccant drain port and remove the
remaining desiccant.
DESICCANT DISPOSAL
Desiccant is not considered a hazardous waste, unless
contaminated with oil or other toxic substances. Disposal
of the desiccant should be handled by a local waste
management company.

6
Pub. No. OM-A-10H REV. 7 — June 2006
INSTALLATION & OPERATION
FIGURE 1 — COMPRESSED AIR SYSTEM RECOMMENDED INSTALLATION FLOW DIAGRAM
COMPRESSED AIR SYSTEM
RECOMMENDED INSTALLATION
FLOW DIAGRAM
PARTICULATE
PREFILTER
DIFFERENTIAL
PRESSURE GAUGE
DIFFERENTIAL
PRESSURE GAUGE
4
WATER COOLED
AFTERCOOLER
13
PLANT
AIR
-40°F TO
-100°F PDP
R - RELIEF VALVE P - PRESSURE GAUGE T - TEMPERATURE GAUGE
AIR COMPRESSOR
AIR INLET
SEPARATOR
(REMOVES 66%
MOISTURE)
AIR COOLED
AFTERCOOLER
T
2
P
RECEIVER
T
COALESCING
PREFILTER
REGENERATIVE
AIR DRYER
PARTICULATE
AFTERFILTER
4
5
TO PLANT USE
37°F +/-F 2°F PDP
37°F +/- 2°F
-100°F PDP
RECEIVER
(OPTIONAL)
INC.
y
REFRIGERATED
AIR DRYER
IN
AIR
COALESCING
AFTERFILTER
DRAIN
R
OPTIONAL 3 VALVE
SYSTEM BYPASS
P6
P
ConservAIR
INTERMEDIATE
CONTROL
(OPTIONAL)
Technologies
4477
AUTO
DRAIN
1. SEE PNEUMATECH BULLETIN PWC-1 2. SEE PNEUMATECH BULLETIN A-3 3. SEE PNEUMATECH BULLETIN A-16 4. SEE PNEUMATECH BULLETIN A-8 5. SEE PNEUMATECH BULLETIN A-10 6. SEE CONSERVAIR BULLETIN CA-200
4477
AUTO
DRAIN
DIFFERENTIAL
PRESSURE GAUGE
DIFFERENTIAL
PRESSURE GAUGE
4
4477
AUTO
DRAIN
P
R
3
4477
AUTO
DRAIN
3
3

Pub. No. OM-A-10H REV. 7 — June 2006
7
PH & EH SERIES HEATLESS AIR DRYER
INSTALLATION & OPERATION
General
1. Install dryer on a level base, indoors or under a shed.
2. During shipment, flange and connecting bolts can
come loose. All bolts should be checked and
tightened as needed.
3. Make sure when the piping is in place that no undue
stress is placed on dryer connections. Union joints or
flexible connections are recommended to relieve
stress. Also, properly support the pipes as needed
with hangers or brackets. Air piping must be
installed by an experienced pipe fitter.
4. Equip dryer with inlet and outlet isolation valves and
a bypass valve for ease of servicing and start-up.
5. Connect electric power to the dryer through a
properly sized fused disconnect switch.
6. Reactivation exhaust may be piped away from the
dryer, making sure proper pipe size is used. The
pipe size should be increased by one size at the
valve, and one additional pipe diameter size for
every ten-foot run to reduce back pressure.
7. ELECTRICAL CONNECTIONS: Follow the
recognized local and municipal electrical codes. All
components must be load rated as approved by
NEC, NEMA, CSA and UL.
8. During shipment, wire connections may become
loose. Per U.L. specification, torque screws inside
enclosure to 20 in-lbs.
9. GROUNDING: It is mandatory that the dryer be
grounded. Use an adequate ground with the
conductor sized to NEC.
10. STORAGE: In case of extended storage period
before the installation, follow these simple
procedures:
a. Seal or cover all the parts
b. Wrap the electrical enclosure
c. Wrap the mufflers
d. If the desiccant is shipped loose, store it inside to
avoid any rain or water damage.
11. LEAK TEST: All the dryers are tested at the factory
for any leaks before shipment. An air leak could
develop during transportation or installation.
Pressurize the system and check for any leaks.
Start-Up Procedure
1. Leave the power switch in the OFF position.
2. Keeping the dryer isolation outlet valve closed,
slowly pressurize both the adsorbent chambers to the
line pressure.
3. Check for any leaks in the system.
4. When the towers are at line pressure, turn the power
switch to the ON position.
5. One inlet valve will close, and the chamber purge
valve will open and depressurize. This may take as
long as 3 minutes.
6. Adjust the purge pressure to the recommended setting,
and lock the valve locking mechanism in place.
7. Slowly open the dryer isolation outlet valve to
pressurize the header system.
8. Observe the dryer operation through one or two
complete cycles.
Adjustments
1. Adjust the purge pressure at the recommended level,
____________________PSIG.
2. Dewpoint Demand Setpoint (SP1):_________
High Humidity Alarm Setpoint (SP2):_________
(See dewpoint display settings on Page 16.)
DMP Microprocessor Control with Cycle Sight™
For standard Pneumatech PH- and EH- Model Air-Dryers
INTRODUCTION
1. GENERAL: The Pneumatech DMP controller is a
microprocessor controlled, seven (7) channel
sequence timer with LCD and LED display features.
The DMP controller consists of a main control unit
and a remote LCD, LED and I/O module. The two
units are connected via ribbon cable.
2. SEQUENCE OF OPERATION: The sequence of
operation is based on a five (5) minute or a ten (10)
minute NEMA cycle. For either cycle length, one-half
of the total time is for adsorption of moisture from the
process gas and one-half is for desiccant
regeneration. Specifics of the timing sequence are
detailed in Figure 2, the Sequence of Operation
Diagram (SDG-2). If power is interrupted, the DMP
controller electronically stores the point in the timing
cycle at which power was removed. When power is
reapplied, timing will resume from that point in the
cycle. At all times during operation, the current status
of the timing cycle is indicated graphically by the
LEDs and textually on the LCD screen.

8
Pub. No. OM-A-10H REV. 7 — June 2006
FEATURES
• LCD screen indicating right/left tower drying, right/left
tower regenerating, tower switching, actual sequence
time, demand cycle indication (opt.), fail to shift alert
(opt.)
• LED sequence annunciator indicating R/L tower
drying/regenerating, demand cycle indicator (opt.),
high humidity alarm (opt.), fail to shift alarm (opt.)
• Timer and setting memory
• Time cycle advance button
• 5 or 10 minute NEMA cycle selector
• Open thermocouple protection
MODE OF OPERATION:
1. START UP: The Digital Microprocessor Controller
will start to operate as soon as power is supplied
and the unit is turned on. The load outputs will
recycle on and off based on a 5 minute or a 10
minute NEMA cycle. The sequence will proceed
according to the Sequence of Operation Diagram
SDG-2. The point of the sequence at which the
timing starts depends on where the cycle stopped
when power was last turned off.
2. MANUAL CYCLE ADVANCE: The backside of the
remote I/O module contains an “ADVANCE” push
button. Each time the “ADVANCE” push button is
pressed, the timing cycle advances by 30 seconds.
The “ADVANCE” push button is disabled whenever
the timing is stopped by an inhibit switch.
3. NEMA CYCLE: The DMP Controller can be set to
operate in a 5 minute NEMA Cycle or a 10 minute
NEMA Cycle. The cycle can be selected via a slide
switch at the back of the remote I/O module.
4. RELAY OUTPUTS (DRY CONTACTS): There are
two relay outputs for remote annunciation. The
output is normally open and rated for 10 AMPS
resistive at 125VAC, 5 AMPS resistive at 30VDC.
The outputs are for the failure to switch and high
humidity alarms. If one or both inhibits are made, the
relays will be energized and the LED on the remote
I/O will light up.
FIGURE 2 — SDG-2: 10 MINUTE SEQUENCE OF OPERATION DIAGRAM
This unit may be damaged by electrostatic
discharge. Follow procedures for static
sensitive parts when handling, shipping or
installing this unit.
1LEFT TOWER
SWITCHING
ON
OFF
ZERO
ZERO
300 SECONDS
300 SECONDS
600 SECONDS
600 SECONDS
2RIGHT TOWER
SWITCHING
ON
OFF
3LEFT TOWER
REGENERATING
ON
OFF
4RIGHT TOWER
REGENERATING
ON
OFF
5DEMAND
CYCLE
ON
OFF
6REPRESSURIZING ON
OFF
7LEFT TOWER
DEPRESSURIZING (OPT.)
ON
OFF
8RIGHT TOWER
DEPRESSURIZING (OPT.)
ON
OFF

Pub. No. OM-A-10H REV. 7 — June 2006
9
OPTIONAL CONTROLS AND ALARMS
1. DEWPOINT DEMAND SEQUENCE CONTROL:
The dewpoint demand mode function will be
operational if there are 5 minutes before the end of
the drying cycle, and the dewpoint is below the
preset level. When in the dewpoint demand mode
all of the timing functions stop. The yellow LED on the
remote I/O module will light up and “DEMAND
CYCLE” will be indicated on the LCD. When the
dewpoint reaches the preset dewpoint level, the
towers will switch and the normal mode cycle will
commence. The dewpoint demand mode function
will be disabled if the dewpoint is above the preset
level.
2. HIGH HUMIDITY: The high humidity alarm
function is indicated by a red LED on the remote I/O
module. The high humidity relay will energize for
remote annunciation. All the normal functions will be
maintained.
3. FAIL TO SHIFT: The fail to shift inhibit will be
energized if the inhibit switch remains closed for 30
minutes beyond the normal cycle. Fail to shift will be
indicated by the red LED on the remote I/O module
and the fail to shift relay will be energized for remote
annunciation. The fail to shift inhibit is an indication
of a malfunction of the tower switching valves or
purge exhaust valves.
Sequence of Operation
The sequence of operation of the Heatless Regenerative
Air Dryer can be readily followed by referring to the flow
schematic on Page 11. The operation is fully automatic,
controlled by a solid-state timer, pneumatic timer or PLC
controller.
During initial start-up with the power switch in the OFF
position, and the towers pressurized with air, both inlet
valves stay in the OPEN position (standard with models
PH-300 and larger) and the purge valves stay in the
CLOSED position. This type of fail safe valve operation
allows the air to dry through both the towers, without any
purge in the event of loss of power to dryer. This will give
you extended drying time until desiccant chambers are
saturated.
The desiccant is designed to handle air saturated with
water vapor only. Any liquids or slugs of water tend to
decrease the efficiency of the desiccant and retard the
regeneration process to provide the designed dewpoint.
With the power switch in the ON position at
time equal to 0.0 minutes, the left tower air inlet
valve is open to allow the air to pass through the left
tower. The right tower inlet valve is closed. The saturated
compressed air/gas passes through the desiccant in the
left tower where the desiccant adsorbs the moisture, and
the dry air at a pressure dewpoint of -40°F or less exits
through the left outlet check valve and goes out into the
plant air system through the afterfilter.
At time equal to 0.1 minutes, the right tower purge
valve opens to fully depressurize the desiccant bed, and
commence the regeneration cycle.
NOTE: As soon as the purge valve has opened, adjust the
purge adjustment valve to the recommended purge control
setting. This adjustment should only be required once, and
then the locking mechanism should be locked in place.
A portion of dry outlet air is diverted and passed through
a series of regulating and flow control valves to meter the
measured quantity of air for regeneration. The pressure of
this purge air is regulated by the purge adjustment valve
at the specified purge pressure on the meter gauge. This
dry purge air at low pressure passes through the right
purge check valve and is introduced into the right tower.
The purge air picks up the moisture from the desiccant and
exhausts into the atmosphere through the purge valve and
purge muffler.
At time equal to 4.3 minutes, the purge valve closes.
The purge air entering the tower starts to repressurize the
chamber.
At time equal to 4.4 minutes, the repressurizing
valve is energized to open and repressurize the tower to
line pressure (standard with models PH-400 and larger).
At time equal to 4.9 minutes, the repressurizing
valve is de-energized to close.
At time equal to 5 minutes, the right tower inlet valve
opens, and the left tower inlet valve closes, so the flow of
wet air/gas is switched from left chamber to the right
chamber.
Frost or ice development on the regenerat-
ing tower is a sign of low inlet air temper-
atures. Due to the expansion of the purge
air, cooling may develop icing in the desic-
cant. Temperature of the purge air is
determined by the temperature of the air
during the drying cycle and should be
greater than +70°F (>+70°F). Adsorption
of moisture by the desiccant results in the
release of heat of adsorption, which is
retained in the bed to assist in desiccant
regeneration.

10
Pub. No. OM-A-10H REV. 7 — June 2006
At time equal to 5.1 minutes, the left tower purge
valve opens to commence the regeneration cycle and the
above process is then repeated on the opposite towers.
NOTE: During the regeneration air flow through the
desiccant bed, the tower pressure gauge should read 0
PSIG. Any higher pressure is an indication of a plugged
muffler, which will retard the regeneration of desiccant.
Shutdown Procedure
Heatless type dryers operate on a standard timer cycle of
10 minutes, 5 minutes drying and 5 minutes regenerating.
This cycle should not be interrupted (except for servicing).
If the dryer needs to be shut down for a certain shift or
weekend, it should be turned off at the end of the 5 minute
regenerating cycle with both towers at line pressure. If
servicing is required, advance the time sequence so the
purge valves close and both towers pressurize. At this time
the dryer can be turned off.
For normal dryer shutdown, wait until both towers are at
line pressure. At this time the purge valves will close.
1. If the compressed air system has been
piped with a bypass around the dryer then
the following should be completed:
a. Open the bypass valve to allow process flow to
continue downstream. Then close the outlet
isolation valve on the dryer bypass piping.
b. Turn the power switch to the OFF position.
c. Close the inlet isolation valve on the dryer bypass
piping. At this time the dryer is isolated and can
be depressurized, for servicing.
2. If the compressed air system has not been
piped with a bypass then the following
should be completed:
a. Turn the power switch to the OFF position.
b. The tower switching valves are normally open
valves; therefore, with the power OFF the inlet
valves to the towers will be open, and the purge
valves will close. This will give you extended
drying time until desiccant chambers are
saturated.

Pub. No. OM-A-10H REV. 7 — June 2006 11
FIGURE 3 — PH & EH SERIES FLOW DIAGRAM
FLOW
DRYING
S
EX
21
9
8
OPEN
S
SS
EX
19
INLET
AIR
5
2
CLOSED
EX
20
6
2
OPEN
5
CLOSED
9
FLOW
REGEN
7
11
9
1
4
OPEN
12
13
10
CLOSED
3
14
15
4
CLOSED
1
ES
ESESESES
CLOSED
S
3
OPEN
10
AIR OUTLET
16 17 18
22
8
9
9
9
11
7
PILOT AIR LINE
EX (SLIGHT BLEED)
6
TYPICAL PH SERIES
FLOW DIAGRAM
1. PRESSURE VESSEL
2. AIR INLET VALVE
3. AIR OUTLET CHECK VALVE
4. PURGE FLOW CHECK VALVE
5. PURGE VALVE
6. MUFFLER
7. DESICCANT FILL PORT
8. DESICCANT DRAIN PORT
9. DESICCANT SCREEN
10. PRESSURE RELIEF VALVE
11. PRESSURE GAUGE
12. PURGE ORIFICE ASSEMBLY
13. PURGE ADJUSTMENT PRESSURE GAUGE
14. PURGE ADJUSTING VALVE
15. REPRESSURIZING VALVE W/SOLENOID
16. PILOT AIR SHUT-OFF VALVE
17. PILOT AIR FILTER
18. MOISTURE INDICATOR (OPTIONAL)
19. 4 WAY LEFT TOWER SWITCHING SOLENOID
20. 4 WAY RIGHT TOWER SWITCHING SOLENOID
21. 4 WAY LEFT TOWER PURGE SOLENOID
22. 4 WAY RIGHT TOWER PURGE SOLENOID
NOTES: 1. THISPROCESS & INSTRUMENT DRAWING ISNOT AN ISOMETRIC DRAWING,
THE RELATIVE POSITION OF VARIOUSEQUIPMENT ISPURELY SCHEMATIC.
2. VALVE POSITION SHOWN IN THISDRAWING ISWITH THE RIGHT TOWER
DRYING & THE LEFT TOWER REGENERATING.
3. REPRESSURIZING VALVE LOCATED ON PH-400 AND LARGER AIR DRYERS.
EX - EXHAUST
ES- ELECTRICAL SIGNAL

12 Pub. No. OM-A-10H REV. 7 — June 2006
PHM MINI SERIES HEATLESS AIR DRYER
INSTALLATION & OPERATION
General
1. If base mounted, secure base plat to hard surface, or
hang securely on a wall.
2. Dryer should be installed indoors, or under a shed.
3. Equip the dryer with inlet and outlet isolation valves
and a bypass valve for ease of servicing and
start-up.
4. Connect electric power to the dryer through a
properly sized fused disconnect switch.
5. Reactivation exhaust may be piped away from the
dryer, making sure proper pipe size is used. For
every ten foot run, increase the pipe diameter by one
size to reduce back pressure.
6. ELECTRICAL CONNECTIONS: Follow the
recognized electrical codes with local and municipal
codes for electrical connection. All components must
be load rated as approved by NEC, NEMA, CSA
and UL.
7. During shipment wire connection may become loose.
Per U.L. specification, torque screws inside enclosure
to 20 in-lbs.
8. GROUNDING: It is mandatory that the dryer be
grounded. Use an adequate ground with the
conductor sized to NEC.
9. STORAGE: In case of extended storage period
before the installation, follow these simple
procedures:
a. Seal or cover all the parts
b. Wrap the electrical enclosure
c. Wrap the mufflers
d. If the desiccant is shipped loose, store it inside to
avoid any rain or water damage.
10. LEAK TEST: All the dryers are tested at the factory
for any leaks before shipment. An air leak could
develop during transportation or installation.
Pressurize the system and check for any leaks.
Theory of Operation
The Pneumatech PHM Mini Series Heatless Regenerative
Air Dryer features “State of the Art” design. The 4-Way
Inlet valve & outlet shuttle valve make these dryers trouble-
free in operation and require very little maintenance.
Standard Heatless Regenerative Air Dryers operate on a
10 minute NEMA cycle.
•Drying: 5 minutes
•Regeneration: 4 minutes, 20 seconds
(continuous flow)
•Repressurizing: 40 seconds
While one absorbent filled tower is drying the inlet flow at
the line pressure, in the upward direction for 5 minutes,
the other tower goes through a mode of desiccant
regeneration in counter flow for 4 minutes, 20 seconds.
Start-Up Procedure
1. Leave the dryer power supply disconnected.
2. Keeping the dryer isolation outlet valve closed,
slowly pressurize both the desiccant chambers to line
pressure.
3. Check for any leaks in the system.
4. Purge valve should be closed at this time (N.C.
Valve).
5. Connect the dryer power supply.
6. The purge valve should open and depressurize one
desiccant chamber.
7. Run the dryer through one or two cycles before
slowly opening the dryer isolation outlet valve.
Operational Observation
1. The drying chamber should be at the line pressure
indicated on the drying chamber pressure gauge.
2. The reactivation chamber should be at 0 PSIG. (Any
higher pressure is an indication of some malfunction,
refer to Troubleshooting Guide on Page 21.)
3. The standard time cycle is 10 minutes. While one
chamber is drying for 5 minutes the other chamber
goes through a mode of desiccant reactivation and
purge for about 4.3 minutes. The purge exhaust
valve then closes to allow the chamber to
repressurize to line pressure before switch-over
occurs at the end of 5 minutes.

Pub. No. OM-A-10H REV. 7 — June 2006 13
MAINTENANCE
PH & EH SERIES HEATLESS AIR DRYER
MAINTENANCE
General
During the first month clean or replace the pilot air filter
element and repeat periodically. Also clean the exhaust
mufflers. Replace mufflers if the tower pressure gauge
reads any back pressure during the regeneration cycle.
No lubrication is required for any system.
Daily
Check auto drain on prefilter every shift.
Weekly
1. Check the dryer’s sequence of operation, and valve
operation.
2. Check the purge control setting.
3. Check the operating conditions; inlet pressure, inlet
temperature and the flow rate.
4. Check the moisture indicator. BLUE color indicates
DRY conditions. If the color is PINK, refer to the
moisture indicator chart on alarm conditions for
probable cause. (Optional equipment.)
5. Check the purge mufflers for blockage. Possible
indication is back pressure on tower under
regeneration. Replace if necessary.
6. Check the pressure drop across prefilter and after-
filter. Replace the elements when the differential
reaches 5-10 PSID.
Monthly
Check the pilot air filter element. Replace if necessary.
Three Months
1. Every three (3) months, close the purge adjusting
valve momentarily to check for any leaks in the inlet
and/or check valves indicated by air coming
through the exhaust mufflers.
2. Check the prefilter and afterfilter elements for
excessive clogging or possible damage. Replace as
necessary.
3. Blow down relief valves.
4. Check outlet dewpoint conditions.
Twelve Months
1. Close the inlet and outlet valves on the dryer or
bypass the dryer and completely depressurize the
dryer system. Open the desiccant fill port and check
visually. If desiccant is contaminated with oil or
broken, replace the desiccant.
2. Check for leaking check values per Table 1
symptoms C & D in Troubleshooting Guide. Repair
or replace as necessary.
3. Remove the inlet switching valves and purge exhaust
valves. Clean and replace worn out seats and seals.
4. Inspect the pilot air cylinders for leaks or worn out
seals. Repair or replace as necessary.
5. Check repressurizing valve. Repair or replace as
necessary.
6. Check pilot air solenoid valves for possible defects.
7. Replace diaphragms in valves on economy EH
Series Dryers. See parts list for sizing.
Dewpoint Sensor (Optional)
It is recommended to recalibrate the sensor probe
annually to maintain accuracy. Contact your local
distributor or factory for exchange policy.
Calibration: To maintain accuracy, replace the probe
every two years.
Probe Replacement: Turn the normal/demand selector
switch to the normal position. This will disable the contacts
for Dewpoint Demand. Isolate and depressurize the probe
chamber. Remove, and replace the probe. Pressurize the
probe chamber and connect the sensor cable. A small
amount of sample air (approximately 2-10 SCFH) should
expel out the chamber needle valve.
Disconnect power and depressurize the
dryer completely before starting mainte-
nance procedures.

14 Pub. No. OM-A-10H REV. 7 — June 2006
Mufflers
Purge mufflers are installed to reduce the noise level. The
mufflers tend to plug up and increase back pressure over
time due to oil carryover and contaminants from
compressor, or due to desiccant dust at the initial start-up.
To eliminate back pressure, replace muffler after three
months, or when the back pressure increases in the
regenerating tower.
PHM MINI SERIES HEATLESS AIR DRYER
MAINTENANCE
General
Clean the exhaust mufflers. Replace mufflers if there is any
back pressure on the tower in the regeneration cycle.
No lubrication is required, or should be used on any of
the components.
Daily
1. Check auto drain on prefilter every shift.
2. Follow the start-up procedure.
Weekly
1. Check the shifting, purge and repressurization
operation.
2. Check the operating conditions; inlet pressure, inlet
temperature and the flow rate.
3. Check the moisture indicator. BLUE color indicates
DRY conditions. If the color is PINK, refer to the
Troubleshooting Guide on Page 21 for probable
cause. (Optional equipment.)
4. Check the purge mufflers for blockage. Possible
indication is back pressure on tower under
regeneration. Replace if necessary.
5. Check the pressure drop across prefilter and
afterfilter. Replace the elements if the pressure drop
exceeds 7 PSID.
Three Months
1. Check the prefilter and afterfilter elements for
excessive clogging or possible damage. Replace as
necessary.
2. Check outlet dewpoint conditions.
Twelve Months
1. Close the inlet and outlet valves on the dryer or
bypass the dryer and completely depressurize the
dryer system. Open and check visually; if desiccant
is contaminated with oil or broken, replace the
desiccant.
2. Inspect and clean the 4-way switching valve, purge
solenoid valve and shuttle valve. Repair or replace
as necessary.
Mufflers
Purge mufflers are installed to reduce the noise level. The
mufflers tend to plug up and increase back pressure over
time due to oil carryover and contaminants from
compressor, or due to desiccant dust at the initial start-up.
To eliminate back pressure, replace muffler after one
month operation and/or when back pressure increases to
5 PSIG in the regenerating tower.
Desiccant Replacement Procedure
Pneumatech uses Activated Alumina Grade A 1/8"
diameter for all standard PHM Mini Series Heatless
Regenerative Air Dryers.
Filling Procedure:
1. Make sure the dryer is depressurized.
2. Remove the upper and lower interconnecting pipe
and valves.
3. Remove the Desiccant retaining screens on both ends
of the desiccant chambers. Remove all desiccant.
4. Using a flash light, inspect the inside of each vessel
to be sure they are empty.
5. Install the bottom desiccant screens and make sure
they are secured tightly.
6. Begin filling the towers.
7. Install the top desiccant screens, and all of the
interconnecting pipe and valves.
8. Refer to the start-up procedure listed in the manual.
Disconnect power and depressurize unit
completely before starting maintenance
procedures.

Pub. No. OM-A-10H REV. 7 — June 2006 15
Desiccant Disposal
Desiccant is not considered a hazardous waste, unless
contaminated with oil or other toxic substances. Disposal
of the desiccant should be handled by a local waste
management company.
FIGURE 4 — PHM MINI SERIES FLOW DIAGRAM
AIR OUT PRESSURE
GAUGE
PRESSURE
GAUGE
OUTLET
SHUTTLE
VALVE
FIXED
ORIFICE
MUFFLER
AIR IN
PURGE
VALVE
PURGE
FLOW
DRYING
FLOW
PRESSURE
VESSEL
PRESSURE
VESSEL
4 WAY
INLET
VALVE
PHM-SERIES
PROCESS & INSTRUMENT DRAWING

16 Pub. No. OM-A-10H REV. 7 — June 2006
DEWPOINT DISPLAY KEY FUNCTIONS
FIGURE 5 — DIGITAL DISPLAY
There are 3 buttons on the front of the hygrometer:
SETPOINT PROGRAMMING
Standard Settings. Setpoints are factory preset.
1. Press PROG and (↓)buttons simultaneously to enter
into the Setpoint Setting Mode.
2. SP1 Adjust value for the Setpoint 1, press PROG to
continue. SP1 set at -40°F (Dewpoint Demand).
3. SP2 Adjust value for the Setpoint 2, press PROG
several times to exit. SP2 set at -20°F (High Humidity
Alarm).
4. SP3 Not used.
Settings for models both Low Dewpoint Options. Setpoints
are factory preset.
1. SP1 set at -100°F (Dewpoint Demand)
2. SP2 set at -80°F (High Humidity Alarm)
3. SP3 Not used.
OPEN SENSOR CONDITION
When message oPEn1 is displayed, the dewpoint sensor
is likely to be disconnected from the hygrometer.
SETPOINT LIMIT INDICATION
Setpoint limit message is the flashing number within
operating range of the hygrometer.
OVER RANGE AND UNDER RANGE
INDICATION
For Ceramic Sensor Probes:
1. When the hygrometer detects the maximum value of
the Measurement range, +68°F flashes on the
display.
2. When the hygrometer detects the minimum value of
the Measurement range, -148°F flashes on the
display.
For Aluminum Oxide Sensor Probes (Dryers built prior to
Year 2000):
1. When the hygrometer detects the maximum value of
the Measurement range, -13°F flashes on the
display.
2. When the hygrometer detects the minimum value of
the Measurement range, -112°F flashes on the
display.
PEAK/VALLEY INDICATION
1. Press (↑) several times to get message PEAK and the
value flashing.
2. Press (↓)several times to get message VALY and the
value flashing.
3. Press (↓)and (↑) simultaneously to reset the Peak or
Valley value while displayed.
Prog. Used to enter Programming Mode, to scroll
through setup prompted, or to enter a
selection or value into memory.
↑↑
↑↑ Used to increase a displayed value. Press and
hold this button to increase the displayed
value.
↓↓
↓↓ Used to decrease a displayed value. Press
and hold this button to decrease the
displayed value.
BUTTON
BUTTON
DIGITAL DISPLAY KEY FUNCTIONS
-73.5F
Prog. OS SP1 SP2 SP3
PROGRAM
BUTTON
OPEN SENSOR
ANNUNCIATOR
SETPOINT
ANNUNCIATORS

Pub. No. OM-A-10H REV. 7 — June 2006 17
FIGURE 6 — DEWPOINT DISPLAY CONTROL WIRING
-+
RELAY
SP 1
RELAY
SP 3
RELAY
SP 2
RELAY
SP 4 (OS)
ANALOG
OUTPUT
DEWPOINT SENSOR POWER
G
NL
-+

18 Pub. No. OM-A-10H REV. 7 — June 2006
OPTIONS LISTING WITH EXPLANATION (PH & EH MODELS ONLY)
AUDIBLE ALARM
The Audible Alarm consists of a buzzer with reset push
button and ON/OFF selector switch.
The audible alarm provides an audible warning to alert
an operator that the dryer is not functioning properly. This
option is used with options such as “Failure to Shift Alarm”
or “High Humidity Alarm.”
FAILURE TO SHIFT ALARM
The Failure to Shift Alarm consists of an alarm light that
illuminates if the desiccant towers fail to shift at a
prescribed time. Dry contacts are provided for remote
annunciation.
HIGH HUMIDITY ALARM
The High Humidity Alarm consists of an alarm light
controlled by a hygrometer that senses the dewpoint at the
outlet of the air dryer. This alarm illuminates when the
dewpoint reaches -20°F and above. A small amount of
sample air is required for operation. Dry contacts are
provided for remote annunciation.
Calibration: To maintain accuracy, replace the probe
every two years.
Probe Replacement: Turn the normal/demand selector
switch to the normal position. This will disable the contacts
for Dewpoint Demand. Isolate and depressurize the probe
chamber. Replace the probe. Pressurize the probe
chamber and turn the power back on.
MOISTURE INDICATOR
(All types of regenerative dryers)
The moisture indicator consists of a small, clear,
polycarbonate filter filled with a color change silica gel. It
is located at the outlet of the dryer. When the dewpoint is
below -10°F, the desiccant is blue. When the dewpoint is
above -10°F, the desiccant is pink. A small amount of
sample air is required for operation.
FIGURE 7 — MOISTURE INDICATOR
PANEL LIGHTS
The Panel Light option consists of four lights: Left Tower
Drying, Right Tower Drying, Left Tower Regenerating, and
Right Tower Regenerating. These lights are for dryer
sequence indication.
PLC CONTROLLER
PLC Controller can be added to control the operation of
standard regenerative dryers. Typically Square D or Allen
Bradley PLCs are used.
DEWPOINT DEMAND CONTROL “DPD”
The Dewpoint Demand control is an energy saver that can
extend the drying cycle without purging, during periods of
lower moisture loads. The Dewpoint Demand system
offers, in one compact package, the utmost in flexibility
and accuracy sensing the actual dewpoint of the outlet air.
The hygrometer senses the dewpoint at the outlet of the
dryer at the end of the drying cycle, and extends the
drying cycle until the preset adjustable dewpoint setpoint
is reached. During this extended drying cycle, the purge
valves are closed and the opposite tower is pressurized
and prepared for the drying cycle. The dewpoint demand
option reduces purge loss and extends valve life. This
option consists of the following:
• Digital Dewpoint Display
• Adjustable Setpoints
• Demand Cycle Light
• High Humidity Alarm Light with Dry Contact
• 4-20mA Output
Calibration: To maintain accuracy, the probe should be
recalibrated annually. Recalibrated probes are
available through your local distributor.
Probe Replacement: Isolate and depressurize the
probe chamber. Disconnect the sensor cable from the
sensor. Remove, and replace the probe. Pressurize the
probe chamber and connect the sensor cable. A small
amount of sample air (approximately 2-10 SCFH) should
expel out the chamber needle valve.
FILTER
HOUSING SILICA GEL