Honeywell ST7800A1054 Purge Timer Card 60 Sec

The Honeywell ST7800A1054 is a plug-in purge timer card designed for use with 7800-Series primary controls and relay modules on gas furnace applications. It is a non-programmable, hardwired card rated for 120V, 60 Hz line voltage operation, providing a fixed 60-second pre-purge timing function within the ignition sequence. This card is intended for residential and commercial natural gas furnace systems and is not heat pump compatible. Installation requires a qualified professional given its role in the ignition control sequence. This card serves as a direct OEM replacement for Honeywell R4126A1073 programmer controls and is compatible with Honeywell 7800-Series equipment. It addresses common failure symptoms such as furnace not igniting, ignition delay, purge cycle timing errors, and control board fault codes. As a plug-in module, it allows straightforward swap-out on affected primary controls without rewiring the base control. Backed by a one-year warranty.