It is specifically engineered to pair with 38MARB single-zone or 38MGR multi-zone outdoor condensers

Integrated Diagnostics: Simplifies troubleshooting with a centralized wiring point for the thermostat

this is the Control Overlay Label only

it is recommended to mount the actuator in a vertical or horizontal position

If the internal ports or the connected condensate drain lines become blocked

Maxitrol MR251D-1 1/2 Regulator 320788-702 It is specifically engineered toThe Maxitrol MR251D 1 1 2 regulator is a dual function modulator regulator valve engineered for critical indirect fired atmospheric burner applications. As a core component of the Selectra electronic gas modulation system, this 1 1 2" NPT unit eliminates the need for external motors or butterfly valves by providing precise, instantaneous temperature control through its internal plunger diaphragm assembly. Designed for high demand environments