American Dryer AD-120ES - Manual (Page 44)

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L. SHUT DOWN INSTRUCTIONS
If 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 either at the external disconnect switch or the circuit breaker.
2. GAS MODELS ... discontinue the gas supply.
1) SHUT OFF external gas supply shut-off valve.
2) SHUT OFF internal gas supply shut-off valve located in the gas valve burner area.
3. STEAM MODELS ... discontinue the steam supply.
1) SHUT OFF steam valves in the supply lines and the return lines.