ST7800A1039

30-Second Purge Timer

30-Second Purge Timer for setting a fixed thirty-second prepurge interval in a 7800 series control, supplied against the exact Honeywell part number with system and revision compatibility checked before quotation.

BRANDHoneywell

STOCK CONFIRMATIONLead time: 2–3 days

CONDITIONBrand new and original

WARRANTY12 months

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Product overview

The Honeywell ST7800A1039 is a 30-Second Purge Timer used for setting a fixed thirty-second prepurge interval in a 7800 series control. Typical applications include boiler burner prepurge timing and furnace startup.

It forms one part of the installed control, I/O, sensing or combustion architecture. Correct operation depends on the matching base, IOTA, controller, detector, field wiring, firmware and project configuration identified for the application.

Selection must follow the complete Honeywell order code rather than appearance alone. Before ordering, confirm compatible burner-control model, required purge duration and airflow proof, burner code, volume and sequence.

COMMON APPLICATIONS

Installed-system context

Boiler burner prepurge timing
Furnace startup
7800 Series sequence configuration

Tell us the controller, communication network and installed panel details. That context helps prevent a visually similar but incompatible replacement.

VERIFIED MODEL DATA

Technical specifications

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Manufacturer: Honeywell
Part number / MPN: ST7800A1039
Product designation: 30-Second Purge Timer
Component type: Plug-in purge timer card
Purge interval: 30 seconds
Controller family: Compatible Honeywell 7800 Series
Function: Defines programmed prepurge duration
Safety requirement: Purge time must satisfy the burner and code

Technical values are compiled from official Honeywell product documentation for this exact article number. Always check the delivered unit nameplate and revision before installation.

What to send for verification

• Complete Honeywell part number and clear nameplate photo
• compatible burner-control model
• required purge duration and airflow proof
• burner code, volume and sequence
• Required quantity, destination and condition

What your quotation will state

• Exact quoted article number
• New, surplus or refurbished condition
• Available quantity and estimated lead time
• Warranty and proposed shipping method

Use only where a 30-second purge is approved for the complete burner system.

BUYER QUESTIONS

Frequently asked questions

What is the Honeywell ST7800A1039?

It is a 30-Second Purge Timer used for setting a fixed thirty-second prepurge interval in a 7800 series control.

What should be checked before ordering?

Confirm the complete part number, then verify compatible burner-control model, required purge duration and airflow proof, burner code, volume and sequence.

Can a visually similar Honeywell part be used instead?

Do not select by appearance alone. Firmware, signal type, IOTA, wiring, approvals and installed-system compatibility can differ even when housings look similar.

Is the quoted module supplied with its base, IOTA or accessories?

Only the exact part number stated in the quotation is included. Companion IOTAs, bases, terminal blocks, cables, detectors, amplifiers or timers are separate unless the quotation expressly lists them.

What information is needed for a quotation?

Send the complete part number, quantity, destination, required condition and a clear nameplate photo. We will confirm the quoted revision, stock status and lead time in writing.

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