American Dryer Corp. AD-75 - Manual (Page 28)

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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 three phase (3Ø)
dryer.
For gas and steam dryers manufactured for operation at three 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.