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The Honeywell AT20A1123 Transformer is a heavy-duty
ensuring the system maintains correct electrical sequencing
the R18 resistor can be cut to enable a continuous heating-speed blower
Smith parts ensures long-term reliability and peak performance for commercial and residential 285 series units
though these parameters are field-adjustable via the internal setup interface to match specific system requirements
Trane TCONT203AS42MA 326058-757 The Honeywell AT20A1123 Transformer isThe Trane TCONT203AS42MA (XR203) is a precision engineered 7 day programmable thermostat designed for high performance multistage applications, supporting up to 4 heating and 2 cooling stages. This commercial grade control is ideal for dual fuel systems, standard gas electric configurations, and complex heat pump systems. Its 3. 5 inch backlit display and soft key interface provide a streamlined experience for contractors managing advanced HVAC