McDonnell & Miller 51-2-HD Control 30067439-890 The low limit adjustment ranges

The low limit adjustment ranges from 2 psi above to 1 psi below supply pressure

It is standard plumbing practice to install a thermal expansion tank on the water heater line to manage pressure increases and protect the dual check internal components

Unlike solid plastic guards that can create a localized micro-climate

The Schneider Electric (Square D) LC1D18G7 Contactor is a high-performance 3-pole IEC contactor engineered for demanding motor control and resistive load applications

The integrated LCDI protection circuit continuously monitors current balance across the 12 AWG conductors

McDonnell & Miller 51-2-HD Control 30067439-890 The low limit adjustment rangesThe McDonnell & Miller 51 2 HD is a heavy duty head mechanism only (Part Number 135100) designed specifically for field replacement on Series 51 2 mechanical water feeders. This unit is engineered for low pressure steam and hot water boiler applications, supporting systems with a maximum vessel pressure of 35 PSI. As a specialized low water cut off (LWCO) component, it features a snap acting SPDT switch that provides simultaneous feed control and