American Dryer Corp. ADG-758 - Manual (Page 27)

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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 3-phase (3ø) dryer.
For gas model dryers manufactured for operation at 3-phase
(3ø), the electrical connections are made at the power distri-
bution 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.
3) 3-Phase (3 ø ) Wiring Connections (Hookup) - for NON-REVERSING MODELS ONLY
The electrical connections on ALL 3-phase (3 ø ) gas model dryers are made into the rear service box
located at the upper left area of the dryer.
NOTE: A CIRCUIT SERVING EACH DRYER MUST BE PROVIDED.
If local codes permit, power to a gas or steam dryer can be made by the use of a 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.