For external signal-start capabilities

This boiler replacement part ensures your hydronic system continues to operate within the manufacturer’s specified safety parameters

additional gaskets may be required depending on your specific compressor serial number

The EXC1378 is the primary heat exchanger assembly

This valve utilizes high-performance Teflon stem packing and an EPDM glass seal to maintain a leak-free interface under thermal cycling

Resideo VCZAM1100 Valve 322838-754 For external signal-start capabilitiesThe Resideo VCZAM1100 Valve is a professional grade 3 4 inch sweat zone valve designed for demanding hydronic applications, including fan coil units, baseboard radiators, and convectors. Engineered with a bronze body and a stainless steel stem, this 2 way cartridge cage valve provides a high 4. 6 Cv capacity and a linear flow characteristic for precise temperature control. It is rated for 60 psi close off pressure, ensuring reliable performance in