The Honeywell ST7800A1062 is a 10-second Purge Timer Card designed for use with Honeywell 7800 Series Relay Modules in commercial and industrial burner control systems. Installed directly into the front slot of a 7800 Series burner programmer, this solid-state purge timer establishes a fixed 10-second pre-purge period to flush unburned fuel gases from the combustion chamber prior to burner ignition.
Technical Details
- Model / Part Number: ST7800A1062
- Manufacturer / Brand: Honeywell
- Product Line: 7800 Series Flame Safeguard Controls
- Module Type: Pre-Purge Timer Card
- Pre-Purge Time: 10 Seconds (Fixed)
- System Compatibility: Honeywell 7800 Series Relay Modules (e.g., RM7800, RM7840, EC7800)
- Mounting Type: Plug-In Keyed Module Slot
- Operating Temperature: -40°C to 60°C (-40°F to 140°F)
- Storage Temperature: -40°C to 65°C (-40°F to 150°F)
- Relative Humidity: 0% to 85% Non-Condensing
- Approvals / Standards: UL Listed, CSA Certified, FM Approved
- Shipping Weight & Dimensions: 0.2 lbs | 4 x 3 x 1 Inches
- Alternate Part Numbers: ST7800A1062, ST7800A1062/U, 7800 ST7800A1062
Key Features
- Fixed 10-Second Pre-Purge: Delivers precise, repeatable timing to purge the combustion chamber before pilot or main burner ignition sequence.
- Plug-In Design: Easily plugs into the front panel slot of any compatible 7800 Series flame safeguard relay module.
- Keyed Hardware Interface: Mechanical keying prevents accidental insertion of incorrect timer cards or misconfiguration.
- Solid-State Reliability: Maintenance-free electronic circuitry ensures stable timing accuracy independent of ambient temperature variations.
- Safety Certification: Complies with stringent industrial burner safety standards including UL, CSA, and Factory Mutual (FM).
Applications
- Pre-purge sequence control for industrial boilers, commercial furnaces, and process heaters.
- Automatic gas, oil, or combination fuel burner management installations using Honeywell 7800 Series controls.
- Direct timer card replacement and maintenance servicing for industrial combustion systems.
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