Timed disconnect suggestions

[marmathsen]

I have a project coming up where I need to wire for an outdoor residential 9kW sauna. In the installation instructions they state:

When this heater is not installed for use with an attendant, a timed-cutoff switch must be connected in the input circuit to disconnect all ungrounded conductors of the heater circuit from the supply source at the end of 1-hour of operation. The timed-cut-out switch shall be located outside the heater room, or mounted to a wall or door inside the heater room. The time feature of
the switch must not lend itself to being overridden.

I haven't talked to the manufacturer but does anyone have a suggestion on what I might use here? The unit has a separate 24v keypad for turning the heater and lights on and off. Is there something that could be wired in either AS the disconnect or adjacent to it that would automatically start a 60 min timer after the heater turns on that could disconnect power and reconnect it after some period of time?

Also, I wonder what they mean by "attendant"

Rob G
Seattle

 

[Cursitti]

A rated contractor for the correct amperage and voltage. With 24v coil. And you could also use a timer a digital timer switch to pull in the coil as well.

 

[marmathsen]

A rated contractor for the correct amperage and voltage. With 24v coil. And you could also use a timer a digital timer switch to pull in the coil as well.

And perhaps some sort of current sensor that triggers the timer?

I assume I could piece together an expensive, complicated setup.

I'm wondering if this is a more common setup in other areas of our industry. Is there some all in one product? Or does everyone just build their own with individual components (current sensor, contactor, timer, some sort of logic controller, all in a pretty little box)?

Rob G
Seattle