this board features standard pin connections for a streamlined install

Where is the optimal location to install this sight glass

you must first access parameter r12 (main switch) and set it to 0 (off)

this high limit temperature switch features an L220-30 rating

the 26B1B0E features a single pole double throw (SPDT) relay

Fenwal 35-705500-501 Control R-410A this board features standard pinThe Fenwal 35 705500 501 is a microprocessor based Direct Spark Ignition (DSI) control engineered for 120V gas fired systems. This 120V ignition module provides a fixed 5 second pre purge to clear the combustion chamber and a 4 second trial for ignition (TFI) to ensure safe burner startup. Designed for compatibility with both natural gas and LP applications, this replacement furnace control board utilizes Detect A Flame technology for precise flame