McDonnell & Miller RB-24E-L Control 30067439-890 This genuine OEM Lennox part

This genuine OEM Lennox part (MPN: 38M07) features a 3-inch insert length and operates as a normally closed switch

The two sets of contacts allow one circuit to send a signal to the Fire Alarm Control Panel (FACP) while the second circuit triggers a local horn-strobe or remote monitoring station

By stabilizing internal pressure

suitable for large-scale residential and light commercial systems

McDonnell & Miller RB-24E-L Control 30067439-890 This genuine OEM Lennox partThe McDonnell & Miller RB 24E L (Part Number 144690) is a specialized residential low water cut off designed for 24V hot water boiler systems. This electronic LWCO utilizes a 3 4" NPT probe style sensing element to monitor for hazardous low water conditions, ensuring the burner circuit is interrupted before equipment damage occurs. Unlike manual reset models, this unit features an auto reset function that restores operation once the water level