Rated for 50/60Hz

this specific model is a 'close on rise' (or open on rise for cooling) configuration

Why are the spade terminals different sizes

the unit enters a safety lockout mode to prevent gas accumulation

Quiet Startup: Engineered to minimize vibration and resonance during the pre-purge and post-purge cycles

Bard HVAC AB3000-B Enhanced Alarm Board 321702-401 Rated for 50/60HzThe Bard HVAC AB3000 B Enhanced Alarm Board is a critical field installed OEM component designed for legacy and modern Bard wall mount units. As a direct Bard replacement part, this board provides a sophisticated interface for HVAC system diagnostics, allowing technicians to monitor dry contact alarm outputs for high pressure, low pressure, and lockout conditions. This enhanced alarm board is essential for remote monitoring applications where real