American Dryer Corp. Phase 7 OPL with S.A.F.E. Gas DSI AD-78 IV - Manual (Page 37)

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K. 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. GAS MODELS...discontinue the gas supply.
1) SHUT OFF external gas supply shutoff valve.