American Dryer Corp. AD-120ES - Manual (Page 39)

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3. Air Connection
Air connection to this system is a 1/4” quick connection.
N. SHUTDOWN 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. Discontinue the heat supply:
a. GAS MODEL – discontinue the gas supply and shut off external gas supply shutoff valve.
b. STEAM MODELS – discontinue the steam supply and shut off external (location furnished)
shutoff valve.