AirTek TW55 Panduan Pemasangan, Pengoperasian & Pemeliharaan - Halaman 7

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A. FIXED TIME CYCLES

The Airtek heatless dryer is equipped with a cycle selection

switch. The dryer can be set to one of two standard fixed

time cycles; Standard 100% load 10 minute cycle, or Short

cycle –80ºF dew point 5 minute cycle. Complete cycle times

are given below.

FIXED CYCLE TIMES: (Time in Minutes: Seconds)

The standard cycle is most commonly used. It is designed

for full load or constant use applications requiring a –40

dewpoint.

The short cycle will provide a –40 to –80ºF dew point when

operating at or below design moisture loading conditions.

Always set the purge as if you had full inlet flow when using

this cycle. Note this cycle is not designed to compensate

for overloading of the dryer.

B. DEMAND CYCLES

CycleLoc and PowerLoc demand cycles are also available.

These cycles offer improved operating efficiency over fixed

time cycles for applications requiring a –40 dewpoint and

that will see lighter than design moisture loadings. 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

loadings!

The CycleLoc feature is built in to every model. It can be

used to interface the dryer with the 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 (unpowered) contact closure across the

CycleLoc terminals on the Sequence Annunciator will cause

the dryer to immediately pause it's cycle & stop purging.

The contact closure needs to correlate with the compressor

stopped or unloaded. When the contact opens the dryer

cycle will resume 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 option is purchased.

Which this option the actual outlet dewpoint of the dryer is

monitored to ensure the online bed is fully utilized prior to

regeneration. Please see Section 9 for further details.

AIRTEK

4087 WALDEN AVENUE, LANCASTER, NY 14086

PowerLoc & CycleLoc cycles can not be used together!

Please consult factory to insure proper use of any of the

nonstandard cycles.

A. PURGE FLOW CALCULATIONS:

For standard inlet conditions use chart to determine

purge flow. Standard conditions are 100 PSIG, 100ºF, and

design inlet flow.

For nonstandard inlet conditions use the following calcula-

tion to calculate purge flow (inlet pressures between 60 &

250 PSIG only.):

Purge flow =

Inlet Flow (SCFM) X 14.7 X 1.15

Inlet Pressure (PSIG) + 14.7

LOWEST operating pressure and MAXIMUM inlet flow

should be used in this calculation.

After calculating the required purge flow, locate the correct

orifice size for your unit on the purge chart, (Page 19).

Read down this column until you locate the required purge

flow. If the exact flow is not listed go to the next highest.

Read across the column to the far left to determine the

correct purge pressure setting.

If operating in the PowerLoc mode, CycleLoc mode or any

fixed time cycle other than the standard 10 minute cycle;

design purge flow must be used.

For a 0º Dewpoint, reduce purge by 25%. Maximum

permissible purge flow reduction is 50% of purge flow

calculated for design inlet conditions.

B. PURGE FLOW ADJUSTMENT:

Purge adjustment must be made with the dryer online, with

one tower drying and one tower regenerating. Insufficient

purge will cause poor performance and eventually result in

desiccant degradation.

Tel: (716) 685-4040

Pg. -7-

Fax: (716) 685-1010