American Dryer Corp. AD-530HS - Manual (Page 38)

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B. Shut Down Instructions
In the case where the dryer is to be shut down (taken out of service) for a period of time, the following MUST BE
performed;
1. Discontinue power to the dryer (both baskets [tumblers]) either at the external disconnect switch or the
circuit breaker.
2. Discontinue the gas supply:
a. Shut off external shut off valve (for both the top basket [tumbler] and the bottom basket [tumbler]
where the independent supply line to each basket [tumbler] is used).
b. Shut off internal gas supply shut off valve located at the gas valve train area (for both the top
and bottom baskets [tumblers]).