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Pub. No. OM-A-75 REV. 4 — March 2006
A.
Install the dryer INDOORS in an area where the
ambient temperature will be above 55°F and below
100°F. Temperatures below 55°F and above 100°F
may cause erratic operation of the air dryer.
Air-cooled dryers must be installed INDOORS in a
location with proper ventilation which will maintain
ambient temperatures as specified above.
B.
Position the dryer to permit free circulation of cooling
air through the condenser. Keep two feet minimum
clearance space around the dryer, and also on the
top for servicing.
Lack of ventilation can build up the room
temperature by recirculating the same cooling air
through the condenser over and over again. This will
eventually shut down the refrigerant compressor on
high head pressure and/or on internal overload.
C.
Connect the compressed air to the dryer inlet.
Connect the plant compressed air line to the dryer
outlet. A three-valve bypass around the dryer is
recommended for dryer service. See Figure 1. A
coalescing afterfilter is recommended for oil-flooded
air compressor systems.
D.
Make sure when piping is in place that no undue
stress is placed on dryer connections. Union joints or
flexible connections are recommended to relieve
stress. Also, properly support the pipes as needed
with hangers or brackets. Air piping must be
installed by an experienced pipefitter.
E.
An aftercooler (air-cooled or water-cooled) must be
installed between the air compressor and the dryer.
Installing the dryer without the proper aftercooler will
bring high inlet temperature compressed air to the
air dryer which will cause premature failures.
Aftercoolers must be followed by a separator and an
automatic drain to remove the condensed moisture
before the compressed air reaches the air dryer.
If the condensed water is not removed at the
aftercooler separator drain, it will reduce the cooling
capacity of the air dryer. Aftercoolers will condense
approximately 2-1/2 to 3 times more water than that
of the air dryer.
F.
Float type auto drains are installed on dryer models
AD-10 through AD-50. For models AD-75 through
AD-3200 electronic timer operated drains are
standard. Dryers AD-75 and larger include a
particle strainer upstream from the drain valve.
To clean, close the shut-off valve and depressurize
the drain line.
All drain outlets may be combined for condensate
disposal. Dispose the condensate in compliance to
local and federal government requirements.
G.
For water-cooled air dryers, connect cooling water
lines to the water-cooled condenser from the water
supply. Water pressure must be a minimum of
35 PSIG.
Do not connect city water to a condenser which is
piped for tower water or vice versa. Strainers are
recommended at the water inlet to the condenser.
Proper chemical treatment is recommended for
cooling tower water to avoid scaling and sludge
inside the condenser.
Drain outlet tubing will periodically con-
tain pressurized air. An unsecured drain
tube will whip around potentially causing
bodily injury.
Do not combine any two or more drain inlet
lines through one single automatic drain
valve. This will reduce or eliminate the
proper drainage.
Do not reduce pipe sizes connected to water
and drain lines. They should be the same or
larger than sizes supplied on the dryer to
avoid excess pressure drop.
