American Dryer Corp. ADG-530D II - Manual (Page 39)

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B. SHUTDOWN INSTRUCTIONS
If the dryer is to be shutdown (taken out of service) for a period of time, the following must be performed;
1. Discontinue power to the dryer either at the external disconnect switch or the circuit breaker.
2. Discontinue the heat supply:
a. SHUT OFF external gas supply shutoff 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 shutoff valve located in the gas valve train area (for both the top
basket [tumbler] and the bottom basket [tumbler]).