Dwyer Instruments TSS2-2100 Temperature Switch R-448A This HVAC reversing valve is

This HVAC reversing valve is built to withstand high-pressure differentials across the slide assembly

The International Environmental 70556303 is a high-performance 1/15HP 115V direct drive motor engineered specifically for fan coil units (FCU) and specialized air handling applications

Its 225F cutout rating is specifically calibrated for high-efficiency systems where precise thermal management is mandatory for operational safety

and EVRC valves

an open limit switch circuit is caused by restricted airflow

Dwyer Instruments TSS2-2100 Temperature Switch R-448A This HVAC reversing valve isThe Dwyer Instruments TSS2 2100 is an industrial grade dual stage temperature switch designed for precision thermal management in high demand HVACR applications. This 115 Vac digital controller features two independent sensor inputs and 2 relays (OUT1: 16A SPDT, OUT2: 8A SPDT) for simultaneous control of heating and cooling stages. Engineered for versatility, the unit supports both PTC and NTC thermistor inputs, allowing for a broad measurement range