American Dryer Corp. MDG-75 - Manual (Page 27)

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3) 3-Phase (3ø) Wiring Connections or Hookup (for Reversing Models Only)
The electrical connections on ALL 3-phase (3ø) gas dryers dryers are made into the rear
service box located at the upper left area of the dryer.
IMPORTANT: A separate circuit serving each dryer must be provided.
If local codes permit, power to a gas dryer can be made by the use of flexible U.L. listed
power cord/pigtail (wire size must conform to rating of dryer), or the dryer can be hard wired
directly to the service breaker panel. In ALL cases, a strain relief must be installed where the wiring
enters the dryer.
For gas dryers 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.
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.