American Dryer Corp. Phase 7 OPL with S.A.F.E. Gas DSI AD-78 IV - Manual (Page 26)

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1) Gas Models
The only electrical input connections to the dryer are the 3-phase (3ø) power leads (L1, L2, L3, and
sometimes neutral) and ground. Single-phase (1ø) power for the control circuit is done internally to
the dryer. No single-phase (1ø) input connection is required on a 3-phase (3ø) dryer.
For gas dryers manufactured for operation at 3-phase (3ø), the electrical connections are made at
the power distribution block located in the service box at the rear, upper left corner of the dryer.
The ground connection is made to the copper lug also provided in this box. To gain access to the
service box contactor, the service box cover must be removed.