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AIRTEK          4087 WALDEN AVENUE, LANCASTER, NY 14086                    Tel: (716) 685-4040                       Fax: (716) 685-1010

3.

A.

START-UP

Please read and understand the entire manual before
operating the dryer.

Check and read over wiring diagram that pertain to your unit
and make sure the correct power supply is connected, but
do not energize circuit at this time.   Provide proper short
circuit protection.  Follow all applicable codes.

Before starting the dryer your compressor should be
running, your air system pressurized and the dryer by-
passed and not yet pressurized.

SLOWLY open the inlet isolation valve admitting com-
pressed air to the dryer.  It is important to pressurized the
dryer slowly to prevent fluidization of the desiccant bed.
The dryer outlet isolation valve should be closed at this
time.

SLOWLY open dryer outlet isolation valve.  At this point all
valves are in their “normal” positions, air is flowing through
both towers and downstream.

Close the dryer bypass valve.  Bypass valve must be bubble
tight to prevent moisture from migrating around the dryer
and contaminating the dry air outlet.

It is recommended that the dryer be started without the
mufflers installed.  This will expedite removal of excess
desiccant dust and prevent premature clogging of the
exhaust mufflers.

CAUTION: USE EAR AND EYE PROTECTION WHEN
OPERATING DRYER WITHOUT MUFFLERS.  EXCESSIVE
NOISE WILL BE CREATED.  DUST AND PARTICLES
FROM THE SURROUNDING AREA MAY BECOME
AIRBORNE.  OPERATION WITHOUT MUFFLERS EX-
CEEDS OSHA LIMITS.

Checking the cycle setting.  It should normally be set to the
standard 10-minute cycle.

Energize the electrical circuit.  The dryer will begin to cycle.
At this point one tower will exhaust its air to atmosphere.
See cautionary statement above.

Check and adjust the setting of the purge flow in accor-
dance with the specifications for your dryer.  See Section 8.

Purge flow is typically 15% of design flow for the dryer. Note
that even if you are operating under a light load the purge
can not be reduced if you are operating in the PowerLoc
mode, CycleLoc mode, or a fixed timed cycle other than the
standard 10-minute cycle.

Never service the Dryer or Filters without first relieving
pressure.

Check all air connections for leaks and tighten as required.
Downstream air leaks will affect dewpoint.  Bypass air leaks will
affect dewpoint.  Only soft seat bypass valves may be used.

Dryer will not perform without proper pre-filtration, conden-
sate drainage, and purge flow.  Dryers may require up to 48
hours of operation to reach normal operating dewpoints.
Therefore, indicators and/or alarms should not be recog-
nized until that time.  Applications requiring dewpoints lower
than –40, or with nonstandard operating conditions, may
require additional time to reach equilibrium.  Exhaust valves
and/or exhaust mufflers may have to be cleaned due to
dusting in shipping and start-up.

4.

A.

SHUTDOWN PROCEDURE:

1.

Allow the dryer to reach a repressurization step & fully

repressurize.
2.

While fully repressurized, remove power from the dryer.

After shutdown airflow will continue through one tower, if
there is downstream demand,  the dryer should be immedi-
ately bypassed to prevent loading of the beds while the
dryer is out of service.
3.

Always remove all pressure & disconnect all power

before servicing the dryer.
4.

If a PowerLoc is installed and the dryer will be out of

service for an extended period of time, remove the probe
and store in a safe, dry location.  The probe will be dam-
aged if exposed to prolonged periods of saturation condi-
tions.

No other special procedures are required.

5.

A.

THEORY OF OPERATION:

Adsorption is the process of removing water VAPOR from
the air to be dried.  All condensed liquid water should be
removed from the inlet air stream prior to reaching the dryer
by suitable separators, traps, filters and drains.  The dryer
can not be burdened with liquid condensate carry-over.

All Desiccants are adversely affected by oil, oil aerosols,
dirt, rust, scale or liquid water.  Effective pre-filtration in
conjunction with automatic condensate drainage is a must
for proper dewpoint depression and long desiccant life.

The saturated inlet air is alternately cycled through each of
the two desiccant beds.  One bed is “on-line” at full line
pressure and flow, adsorbing water vapor from the satu-
rated inlet air.  This is the drying bed.  The other bed is “off-
line” at atmospheric pressure (0 PSIG) being regenerated
by a depressurized portion of the dried outlet air (purge air).
This is the regenerating bed.

The quantity of purge air for a standard pressure dryer is
approximately 15% of inlet design flow.  This air is taken
from the dry air outlet, directed through the purge flow
controls, desiccant bed, and finally exhausted to atmo-
sphere to accomplish regeneration.  Purge air consumption
is typically the largest cost involved with operating a
heatless desiccant air dryer.  (Purge air is “nonrecoverable”
and the air system in question must be designed to allow for
this usage.)

Summary of Contents for TW10

Page 1: ...HEATLESS DESICCANT COMPRESSED AIR DRYER MODELS TW10 TW55 INSTALLATION OPERATION MAINTENANCE MANUAL Service Department 1 800 451 6023 Cost 5 00 ...

Page 2: ...on manual for the use of the AIRTEK Dryer Information is given not only for the user but also for the technical personnel who may repair the dryer in the event that this is ever necessary It is recommended that all who will have responsibility for the dryer carefully read all sections of this manual before commencing with the installation The most important step is for you as a customer is to call...

Page 3: ...ons Pg 7 8 B Purge Flow Adjustment C Dryer Outlet Flow 9 A Dryers Equipped with PowerLoc Pg 8 10 A Maintenance Program Pg 8 9 11 A Parts Description Pg 9 B Recommended Spare Parts 12 A Desiccant Replacement Pg 10 13 A Dryer Capacity Chart Pg 10 14 A Service Instructions Pg 11 B Equipment Return Instructions C Warranty D Disclaimer 15 A Trouble Shooting Guide Pg 12 13 16 Drawings A Recommended Inst...

Page 4: ... Desiccant dust may cause contamination excessive wear to equipment Before any attempt is made to operate the AIRTEK dryer the operator should thoroughly read and understand this instruction manual Improper operation will cause poor results from the dryer Periodic checking of the dewpoint just downstream of the dryer is the best indication of whether the dryer is perform ing as expected For a roug...

Page 5: ...orm without proper pre filtration conden sate drainage and purge flow Dryers may require up to 48 hours of operation to reach normal operating dewpoints Therefore indicators and or alarms should not be recog nized until that time Applications requiring dewpoints lower than 40 or with nonstandard operating conditions may require additional time to reach equilibrium Exhaust valves and or exhaust muf...

Page 6: ...sted to obtain the required purge flow On TW25 TW40 TW55 models the purge control system consists of a purge filter needle valve pressure gauge orifice and two purge check valves The needle valve is adjusted to obtain the specified purge pressure which equates to the proper purge flow STEP 2 LEFT DRYING RIGHT REPRESSURIZING The purge stop solenoid S2 is de energized and returns to its normally clo...

Page 7: ...sume where it left off Typically a contact on the compressor pressure control is utilized If a dry normally open with compressor running contact is not available an auxiliary relay will need to be added The jumper JP1 must be installed for correct CycleLoc operation Please consult the factory for more information The PowerLoc demand cycle is available only when the PowerLoc Demand Cycle Controller...

Page 8: ...regeneration cycle of 4 minutes and 15 seconds Thus the PowerLoc can only compensate for under loading not overloading conditions If there is any error with the PowerLoc the dryer will default to the fixed time cycle There is also a PowerLoc On Off switch located in the control enclosure If this switch is turned off the dryer will operate in the fixed time cycle The PowerLoc will continue to displ...

Page 9: ...pressure situations Standard setting is 150 PSIG F Purge Exhaust Muffler Furnished to reduce exhaust noise during purge and blow down for personnel protection and to comply with OSHA standards Mufflers offer no benefit to the operation of the dryer and are a maintenance concern Consideration should be given to locating the exhaust in an area where mufflers would not be required G Purge Control Val...

Page 10: ... Use only AIRTEK Desiccant which is a high capacity high quality desiccant designed sized for AIRTEK Dryers MODEL DESICCANT LBS TOWER TW10 7 TW15 7 TW25 15 TW40 23 TW55 35 13 A DRYER CAPACITY CHECKING DRYER SIZE A Determine operating pressure B Determine input SCFM into dryer C Read down the nearest operating pressure column until you arrive at a rating equal to or greater than your require ment t...

Page 11: ...are warranted against defect due to faulty workmanship or parts for a period of one year from date of shipment This guarantee covers replacing such parts as found defective due to defective material or workmanship only when such parts are returned to AIRTEK transportation prepaid and subject to our inspection and approval No liability is accepted for consequential damages or reinstallation AIRTEK ...

Page 12: ... to within specified operating parameters High flow low pressure or high temperature will all adversely effect dryer performance Liquid water present at dryer inlet Check water level in separators receivers prefilters operation of associated y strainers and auto drains Check condition of filter elements or check D P Gauges Desiccant worn out contaminated or insufficient quantity Replace or top off...

Page 13: ...e flow too high Adjust Leaking inlet valve See inlet valve not function ing Bad seals or solenoid Rebuild valves with available kits or replace No output from controller Replace fuse or controller Valve dirty Clean When factory assistance is required always provide model serial number full description of problem and a completed analyzing chart For trouble shooting PowerLoc please consult PowerLoc ...

Page 14: ...REE FLOOR KEY AD AUTOMATIC DRAIN F PARTICULATEFILTER C COALESCINGFILTER A ADSORBINGFILTER T TEMPERATURE INDICATOR D DEWPOINT INDICATOR CONTROLLER DIFFERENTIALPRESSUREINDICATOR DWG AT718 Rev C 1 15 92 NOTES 1 By Pass Piping should be installed around filters and dryer for servicing 2 Differential pressure indicators should be installed on filters for monitoring of elements 3 Coalescing Prefilter Pa...

Page 15: ...Pg 15 AIRTEK 4087 WALDEN AVENUE LANCASTER NY 14086 Tel 716 685 4040 Fax 716 685 1010 16 B Flow Diagram TW10 TW15 ...

Page 16: ...Pg 16 AIRTEK 4087 WALDEN AVENUE LANCASTER NY 14086 Tel 716 685 4040 Fax 716 685 1010 16 C Flow Diagram TW25 TW55 ...

Page 17: ...Pg 17 AIRTEK 4087 WALDEN AVENUE LANCASTER NY 14086 Tel 716 685 4040 Fax 716 685 1010 16 D Wiring Diagram Standard Dryer ...

Page 18: ...Pg 18 AIRTEK 4087 WALDEN AVENUE LANCASTER NY 14086 Tel 716 685 4040 Fax 716 685 1010 17 A ...

Page 19: ...Pg 19 AIRTEK 4087 WALDEN AVENUE LANCASTER NY 14086 Tel 716 685 4040 Fax 716 685 1010 17 B Purge Charts ...

Page 20: ... 5 MIN PERFORM EACH OF THE FOLLOWING CHECKS ONCE DURING LEFT TOWER DRYING ONCE DURING RIGHT TOWER DRYING IS THERE ANY BACK PRESSURE IN THE REGENERATING TOWER Y N _______________ PSIG WITH THE PURGE VALVE FULLY CLOSED IS THERE ANY FLOW FROM THE EXHAUST VALVE L Y N R Y N HAVE YOU CHECKED THE CONDITION OF YOUR COALESCING PREFILTER ELEMENT HAVE YOU CHECKED THE AUTO DRAINS ON YOUR SEPARATOR RECEIVER PR...

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