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the 383-500-020 is specifically designed for Weil McLain Ultra Series 1 and Series 2 units
Optimized Airflow: Specifically pitched fins maintain the required CFM for proper unit heater combustion and exhaust
regardless of the dial setting
Reduced Inventory: One universal blank thermal chart replaces dozens of specific pre-printed ranges
White-Rodgers 1F85U-42NP Thermostat 30067439-890 the 383-500-020 is specifically designedThe White Rodgers 1F85U 42NP is a versatile 80 Series Universal Staging Thermostat designed for high performance reliability in 2 Heat 2 Cool conventional systems or up to 4 Heat 2 Cool heat pump applications. This non programmable thermostat supports dual fuel control without requiring an external outdoor sensor, making it a robust choice for contractors managing complex HVAC configurations. It operates via 20 30Vac hardwire or battery power for