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Description
The Honeywell Controller ST7800A1039/U is a plug-in purge timer module designed for use with Honeywell 7800 Series relay modules. It provides the prepurge timing function, with a prepurge timing of 30 seconds. This module is installed into the relay module compartment to control the prepurge cycle in burner systems.
Further details
Installation
Remove keyboard display module, dust cover, data bus module, or remote reset module; pull current relay module out; set purge timer card; align and insert; reattach modules; restore power and run cycle
Choosing and fitting
Parts of this type are selected by matching the prepurge timing requirement and the relay module series. Installation involves disconnecting power, removing the keyboard display module, dust cover, data bus module, or remote reset module, and then pulling out the existing relay module if installed. The purge timer card must be aligned with the slot in the relay module and inserted properly. After reattaching the removed components, power is restored and the system is run through a complete cycle to verify operation.
