Depressurization
1. Open bypass piping.
2. Close outlet isolation valve.
3. Close inlet isolation.
4. Allow dryer to run. The normal cycle will allow both tanks to blow down and depressurize.
5. Disconnect power.
6. With the “Basic Filter Package” dryers, open manual ball valves on filters to allow full
depressurization. Leave ball valves on filters open while servicing. Without the “Basic Filter
Package”, close control air filter off. Remove nylon tubing from control air filter or any control
solenoid. Reopen control air filter to fully depressurize. Leave control tubing off while servicing.
To restart, follow “Start-Up” procedure on page 8. IMPORTANT! Always remove all pressure and
disconnect all power before servicing the dryer.
IMPORTANT! If a Pro Purge or 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 damaged if
exposed to prolonged periods of saturated conditions.
Section 8 Demand Cycles
Cycle Loc, Pro Purge and Powerloc are demand cycles available for any heatless dryer. Cycle Loc is
standard on all heatless dryers (75 SCFM & Up). Powerloc and Pro Purge is an option that needs to be
purchased. These cycles offer improved operating efficiency over fixed time cycles for applications
requiring a -40°F dew point and that will see lighter than design moisture loading. Demand cycles
reduce total purge consumption and thus reduce energy usage by tailoring the cycle to actual loading,
vs., fixed cycles which assume 100% design loading. Demand cycles can not accommodate for heavier
than design loading. It can not shorten the fixed cycle, only lengthen it.
Cycle Loc
The Cycle Loc feature is built into TW75 and up models. It can be used to interface the dryer with the
air compressor. The dryer must be able to handle at least full flow of the compressor and the receiver
should ideally be located downstream of the dryer. A dry (un-powered) contact closure across the Cycle
Loc terminals on the Sequence Annunciator will cause the dryer to immediately pause its cycle and stop
purging. The contact closure needs to correlate with the compressor stopped or unloaded. When the
contact opens, the dryer will resume where it left off. Typically a contact on the compressor control is
utilized. If a dry, normally open (with compressor running) contact is not available; an auxiliary relay will
need to be added. The cycle selector needs to be set on “Cycle F” for correct Cycle Loc operation.
Please consult factory for any questions.
Pro Purge
The Pro Purge is an advanced Sequence Annunciator and Proportional Demand Control. The probe
is a thin film gold aluminum oxide design. The Pro Purge probe monitors the outlet pressure dew
point of the dryer and displays the dew point range via three LED indicating lights which are as
follows:
-40 = Dew points at -40°F or greater
-30 = Dew points between -39 to -21°F
-20 = Dew points at -20°F or less
The Proportional Demand Cycle Control feature tailors the dryer cycle to actual loading conditions,
maximizing energy usage. Without the Pro Purge the cycle is fixed and “worst case” design conditions
are assumed.
The Proportional Demand Cycle is accomplished by the probe providing an input to the Sequence
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