h (dry contact) 8 bit AID conversion Digital Outputs: Triac outputs (zero-cross switching) rated at 50VAC, 1k Power Requirements: 15VDC, 250mA Multizone Expansion Board 016.4097M . n -1 C . I About H I Solutions Provides control for 4 zones in a multi-zone system. Each zone has a thermostat with 10k therrnisto