Trane TCONT103AN21HA Thermostat L99H008 the Maxitrol TD121B must be

the Maxitrol TD121B must be matched with a sensor that shares the same 120-170°F color code/range

As a genuine Rheem replacement part

speeding up the call-back-free installation

reducing the overall electrical load on the control circuit

including those equipped with a positive positioner and spring ranges such as 8 to 13 psi

Trane TCONT103AN21HA Thermostat L99H008 the Maxitrol TD121B must beThe Trane TCONT103AN21HA is a professional grade, non programmable digital thermostat engineered for precise 2 stage heating and 1 stage cooling applications. As a veteran HVAC technician, I recommend this unit for its reliability in systems utilizing heat pump technology, gas, oil, or electric furnaces. This model is the direct OEM replacement for legacy controls including the TCONT401AN21MA, TCONT401AN21MAA, XR401, and ACONT401AN21MA. It features a