Bulletin TI-75A20C
Installation, Operation and Maintenance Manual
Technical Information
Parker Balston 75-A20 Compressed Air Dryer
2
Parker Hannifin Corporation
Industrial Gas Filtration and
Generation Division
Lancaster, NY • 1-716-686-6400
Parker Balston 72-130 Pressure Regulator -
The 72-130 should be used to control the inlet air pressure
to the dryer. Eliminating pressure fluctuations from the compressed air supply enhances the operation of
the dryer, eases troubleshooting, and minimizes variations from documented specifications which could
result from an inconsistent air supply. The 72-130 has 1/2" female NPT inlet and outlet ports, and is
assembled with a 0-130 psig (0-9.0 barg) pressure gauge.
Balston 2206N-1B1-DX Coalescing Prefilter -
When the compressed air supply to the dryer contains
excess water, install an auxiliary prefilter upstream from the dryer. The Balston 2206N-1B1-DX coalescing
filter has 3/4" NPT ports and an automatic float drain.
All installation, operation, and maintenance procedures for the compressed air dryers should be
performed by suitable personnel using reasonable care.
Disconnect the electrical power and isolate the unit from the compressed air supply before starting
any maintenance procedure.
The only required maintenance activity for the Balston 75-A20 Compressed Air Dryer is changing the filter
cartridges in the prefilters annually (see Ordering Information at the end of this section for prefilter cartridge
part numbers). The 75-A20 is equipped with a differential pressure indicator which monitors the pressure
drop across the prefilters. Changing the prefilter cartridges on the Balston Air Dryers requires approximate
-
ly 15 minutes. Additional coalescing prefilter cartridges and moisture indicating cartridges for the Balston
75-A20 Air Dryer may be ordered through your local Parker Balston representative.
Changing filter cartridges more frequently will translate into direct energy savings and reduced operating
costs. Annual electricity costs to operate a typical 100 HP compressor can be as high as $50,000. Pres-
sure drop in the system adds to this expense. A system operating at 100 psig that is experiencing a 2
psig pressure drop through a filter, requires an additioal 1% in operating energy costs or approximately
$500.00+ per year.
The moisture indicator monitors the condition of the air coming out of the dryer. The moisture indicator
should be green. If the indicator changes to yellow, follow the trouble shooting procedures on page 4.
Note:
Upon start-up, the moisture indicator may be yellow, but the dryer should be permitted to run for at
least 30 minutes before reporting this as a malfunction.
Recommended Accessories
Maintenance
The 75-A20 Compressed Air Dryer is equipped with 2 coalescing prefilters (B2102N-0B1-DX, B2102N-1B1-
BX). The prefilters have integral automatic float drains. The 1/8" NPT drain port will pass small quantities of
water and oil and should be piped away to a suitable containment device or drain.
The Balston Air Dryers are powered by a 12 VDC power supply through the accompanying 12 VDC trans-
former. Plug the transformer line cord into the dryer first (see Figure 1), then plug the transformer into the
appropriate 120 VAC outlet.
Regenerate the drying towers for 24 hours prior to initial start-up. To regenerate the drying towers, open the
inlet air supply, shut off the outlet flow from the dryer, and plug the dryer in. This process will cycle the dryer
with 100% purge air.
