The 770-1 can be mounted in any position except with the sample line connectors facing upward (upside down)

Unused primary voltage leads must be capped with wire nuts or heat shrink to prevent short circuits against the enclosure or other live components

Using a genuine 100111845 exhaust elbow guarantees precise fitment

these orifices provide the reliable sealing and discharge coefficients necessary to prevent overfiring or incomplete combustion in high-efficiency gas furnaces

Lochinvar & A.O. Smith 100077876 Valve 326058-756 The 770-1 can be mountedThe Lochinvar & A. O. Smith 100077876 Valve is a 3 4" x 3 4" NPT combination control designed for high efficiency commercial and residential water heaters and boilers. This slow open gas valve is engineered to prevent rapid pressure fluctuations, ensuring a smooth, controlled ignition sequence that stabilizes the combustion process and protects the heat exchanger from thermal shock. It is factory configured for Natural Gas (NAT) but includes the