Carrier HT01AH851 Transformer 321702-401 Smith 100110278 Gas Valve is

Smith 100110278 Gas Valve is an essential OEM replacement component designed for high-efficiency residential and commercial water heating systems

the move from original R-22 equipment to this service replacement requires a reliable drop-in that matches existing footprints

offering a seamless fit for J10_DDA and J11_DDA (D10 and D11) series models

A veteran tech will use a manometer to measure the actual draft pressure at the switch port

Its robust construction ensures stable flame rectification and long-term durability in demanding furnace and boiler environments

Carrier HT01AH851 Transformer 321702-401 Smith 100110278 Gas Valve isThe Carrier HT01AH851 is a high capacity 1000VA control power transformer engineered for demanding industrial and commercial HVACR applications. Designed for versatile power distribution, this unit features a dual voltage primary 240 480V side and a 120 240V secondary output, providing the necessary step down for control circuits, contactors, and high draw relays. As a genuine OEM HVAC replacement part, it ensures precise electrical characteristics