Great Lakes Air Products GPS-500 Gebrauchsanweisung - Seite 12

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Intermittent Cycle Problems

There are three probable reasons that a system cycle will fail intermittently. The first possible reason

is the timer control card. This fault is very easy to verify with the help of a voltmeter. Use the meter to

match the control cycle to electrical outputs associated with the output diaphragm on page 9 of this

manual.

The second is a solenoid valve fault. To check this possibility verify that control air is applied to the

correct inlet or purge valve, by trying to remove the push-lock tubing on the top of each valve. This is

accomplished by pressing the locking ring between the brass fitting and the tubing and gently pulling

the tubing. If pressure is present, you will not be able to remove the tubing as it will be locked in place

by the pressure. If the tube has no control air, it will easily come out. Replace the tubing immediately if

it does come out your goal is to identify control signal not disconnect the tubing. Control air should be

present on the inlet valve that is closest to the purge valve venting purge air.

The opposite (online tank) inlet valve should not have control air and the opposite purge valve should

have control air because it is normally open. If the control card is sending the correct electrical signal

to the solenoid and the solenoid is not sending air to the correct process valve the solenoid is at fault.

If both the card and the solenoids check out and you have performed a valve check from

Valve Integrity in this, manual the problem must be check or inlet valve sticking.

appropriate left or right check valves and rebuild the inlet valves with complete rebuild kits.

Desiccant Testing or Replacement

Desiccant in a regenerative dryer has an average life of 5 years, provided the coalescing filter

upstream of the dryer is monitored and serviced regularly. Some types of system failures or lack of

filtration maintenance can damage desiccant before that period. We recommend that you pull a

desiccant sample and have it analyzed after approximately 3 years of service.

To pull a sample, de-energize and completely depressurize the dryer. Remove the lower

desiccant drain plug and fill a zip-lock bag full of desiccant. A quart bag with 1 to 2 pounds

of desiccant sample is usually sufficient. Label the bag left or right tower with the serial

number of the dryer.

Replacing the drain plug after it has been removed can be a messy and aggravating process without a

simple little trick. Before removing the plug, have a piece of cardboard just slightly larger than the

drain opening handy. Once the sample bag is full, cover the hole with your hand and work the

cardboard in the drain hole to stop the desiccant flow. Remove any debris from the threads reapply

thread sealant and replace the plug. The cardboard left in the tower will cause no problem to the

dryer operation.

GPS Heatless Regenerative

Page 12 of 14

Replace the