Caution
(1) AD27-D with auto drain may have leakage of accumulated drain during pressure exhaust (this
leakage is allowed in their constructions and not considered failure). Be sure to connect piping for
drain.
Selection
Warning
(1) Grease used on the internal sliding parts and seals may flow to the outlet side. If this is not
acceptable, please consult SMC.
(2) N.O. type auto drain should be operated under the following conditions to avoid malfunction.
Operating compressor: 0.75 kW or more, Discharged flow rate: 100 L/min (ANR) or more
When using 2 or more auto drains, multiply the value above by the number of auto drains to find
the capacity of the compressors you will need. For example, when using 2 auto drains, 1.5 kW
(200 L/min (ANR)) of the compressor capacity is required. The operating pressure should be 0.1
MPa or more.
(3) N.C. type auto drain should be operated under the following conditions to avoid malfunction.
Operating pressure for AD27: 0.1 MPa or more, for AD37 and AD47: 0.15 MPa or more.
Installation
Warning
(1) Do not drop or apply impact during transportation or installation. It will cause damage to the product
and result in operation failure.
(2) Do not install in areas of high humidity or high temperature. Operation outside of the product
specification range may cause damage to the product or operation failure, or shorten the product
life.
(3) Connect the product ensuring the direction of "1"(IN) and "2"(OUT) for air direction and indicated
arrow. Incorrect connections may cause malfunction.
(4) Install with adequate space for maintenance beneath the product. Refer to the section [12.
Dimensions] (P30) for necessary space.
(5) Install vertically so that outlet of drain is downward. It cannot be used in horizontal or upward
direction as it may cause operation failure.
Piping
Warning
(1) Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to
remove chips, cutting oil and solid foreign material from inside the pipe. Contamination of piping
may cause damage or malfunction.
(2) When screwing together pipes and fittings, etc., be certain that chips from the pipe threads and
sealant do not get inside the pipe. When a sealant tape is used, leave 1.5 to 2 thread ridges
exposed at the end of the threads.
(3) Connect piping/fittings using the recommended torque while holding the female thread side tightly.
Insufficient tightening torque leads to cause of loosening or sealing failure, and excessive
tightening torque leads to cause of breakage of screws. Tightening without holding female thread
applies an excessive force to the bracket directly, leading to breakage.
Recommended tightening torque
Unit: N m
Thread size
1/8
1/4
3/8
1/2
3/4
1
Torque
7 to 9
12 to 14 22 to 24 28 to 30 28 to 30 36 to 38
(4) Before using an SMC fitting and S coupler, please refer to "Tightening the threaded portion of the
connection thread" of the Fittings & Tubing Precautions.
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