American Dryer Corp. Gas DSI/HSI/Electric/Steam/Phase 7 with S.A.F.E. D-40 - Manual (Page 56)

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2. Water Connections:
The water connection is made to the 1/2” M.P.T.
bushing of the electric water solenoid valve located
at the rear upper left area of the dryer (see photo).
The water solenoid valve has a 3/8” M.P.T.
connection and a 1/2” bushing is supplied to
provide the minimum 1/2-inch supply (feed) line.
Flexible supply line/coupling must be used in effort
to avoid damage to electric water solenoid valve.
IMPORTANT: Flexible supply line/coupling must be used. Solenoid valve failure due to hard
plumbing connections WILL VOID WARRANTY. It is recommended that a filter
or strainer be installed in the water supply line.
Typical water supply ...