Bulletin TI-75A20C
Installation, Operation and Maintenance Manual
Technical Information
Parker Balston 75-A20 Compressed Air Dryer
Parker Hannifin Corporation
Industrial Gas Filtration and
Generation Division
Lancaster, NY • 1-716-686-6400
1
Parker Balston 75-A20 Compressed Air Dryer
Bulletin TI-75A20C
Installation, Operation, and Maintenance Manual
CELL: DRY
®
Introduction
Installation
Balston compressed Air Dryers provide clean, dry air from
an existing compressed air supply. The 75-A20 Air Dryer
delivers -100°F (-73°C) dewpoint air.
The 75-A20 Compressed Air Dryer is powered by a 12 VDC
power supply. Each dryer is equipped with a plug-in trans-
former for connection to the local power supply.
These instructions must be thoroughly read and under-
stood before installing and operating this product. If you
have any questions or concerns, please call the Technical
Services Department at 800-343-4048, 8AM to 5PM Eastern
Standard Time (North America only) or email at balston-
techsupport@parker.com. For other locations, please
contact your local representative.
The dryer should be fastened securely, in a vertical position,
to a wall or similar mounting surface according to National
Electrical Code (NEC) and local building code guidelines. All
mounting hardware supplied by the customer should be ad-
equately sized to support the weight of the unit in its mounted
position.
To facilitate routine maintenance, install a shut-off valve on the
supply air line, upstream from the dryer. Pipe the supply air
(60 psig-125 psig, 4.1 barg-8.6 barg) to the inlet port of
the dryer. (
Note:
Pipe size must match inlet and outlet port
sizes or adequate lengths of pipe must be used to reduce/
increase pipe size to match ports. Please consult factory for
additional assistance.) The air dryer should be installed on a
compressed air system which contains a properly sized
aftercooler. The temperature of the supply air entering the
Balston Air Dryer should not exceed 78°F(25°C). If the
temperature of the inlet compressed air exceeds 78°F(25°C),
the dewpoint of the air generated by the dryer may exceed
the rated dewpoint. If the compressed air supply has excess
water and/or oil or is supplied to the dryer from an elevated air
line, a drip leg must be installed directly upstream from the dryer to reduce the amount of water and oil
which could get into the dryer and associated valves and cause non-warranty damage to the unit (see Fig-
ure 2). A minimum supply air pressure to the air dryer of 60 psig (4.1 barg) is required to maintain proper
operation of the drying towers and associated valves. The maximum supply pressure should not exceed
125 psig (8.6 barg) or damage to the unit may occur.
It is important to control output pressure and flow from the dryer to avoid exceeding the rated capacity of
the dryer. If the maximum flow rate of the dryer is exceeded, the process air may not meet the published
dewpoint specifications. The installation of a pressure regulator and flow control valve downstream from
the Balston Air Dryer is recommended to control output flow characteristics.
Figure 1 - 75-A20 Compressed Air Dryer
