SMC Networks AW20 Series Operational Manual page 8

(7) The piping for drain from auto drain should be connected under the following requirements to avoid
operating failure.
Tubing for AD27-D: I.D. ø2.5 (ø3/32") or larger, Length 5 m (200 inch) or shorter
Tubing for AD37, 47(N)-D: I.D. ø4 (ø3/16") or larger, Length 5 m (200 inch) or shorter
Tubing for AD38, 48(N)-D: I.D. ø6.5 (ø1/4") or larger, Length 5 m (200 inch) or shorter
Warning
(1) Use clean air. Do not use compressed air containing chemicals, organic solvent, synthetic oil or
corrosive gas as it may be cause of breakage of components or operation failure.
(2) Air containing too much moisture may cause malfunction. Install an air drier or aftercooler before
the product.
Warning
(1) Release the pressure in the product to the atmosphere when replacing parts or removing piping.
(2) Maintenance and checks should be done by following the procedure in this operation manual.
Incorrect handling of the product may cause breakage or operation failure of the equipment or
device.
(3) Perform periodical check to find cracks, flaws or other deterioration on resin bowl. If any of these
appear, replace with a new or metal bowl. Otherwise, breakage may occur. Investigate and/or
review the operating conditions if necessary.
(4) Check for dirt in resin bowl periodically. If any dirt is seen, replace with new bowl. If removing dirt by
washing the resin bowl, never use washing material other than neutral detergent. Otherwise, the
bowl is damaged.
(5) Open and close the drain cock manually. The use of tools can result in damage to the product.
(6) Replace the element every 2 years or when the pressure drop at the output pressure from initial
operation becomes 0.1 MPa, whichever comes first, to prevent damage to the element.
(7) Discharge drain from the bowl before the drain level in the bowl reaches baffle. Refer to section [9.
Operation and Adjustment] (P24-25) for discharging of drain.
(8) When using the filter regulator with backflow function between a solenoid valve and an actuator,
check the pressure gauge periodically. Sudden pressure fluctuations may shorten the durability of
the pressure gauge. A digital pressure gauge is recommended for such applications or as deemed
necessary.
Caution
(1) If an emergency countermeasure is to be taken during setting failure or exhaust leakage, the
internal valve seating part should be checked. If failure such as foreign matter is found, remove it
before performing the emergency countermeasure.
(2) Check the element periodically and replace it with a new one if necessary. If it is found that outlet
pressure drops lower than the normal condition or the flow is restricted during operation, check the
condition of the element.
(3) For the N.C. type auto drain, when there is no pressure, drain which does not operate the auto
drain mechanism will remain in the bowl. It is recommended to release the residual drain manually
at the end of the working day.
Air Source
Maintenance
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