From Alesis, Under 'How does the HD24 work in an ADAT system with a BRC? How does a BRC "see" an HD24?'
"Using the Alesis Sync In/Sync Out connectors, the HD24 appears as three 8-channel ADATs in your chain. Once a chain of machines are established, the HD24 will behave as extremely fast tape-based ADATs."
So yes, it works with the HD24.