This article applies to South-Tek Systems N2-BLAST FPS-1650, FPS-3250, and FPS-5000 fire protection nitrogen generators.
Routine preventive maintenance is important for reliable nitrogen generation, alarm performance, and long-term equipment life. This article outlines the recommended maintenance items for the generator, associated accessories, and external compressor where applicable.
General maintenance guidance
- Only qualified personnel should perform maintenance and repairs.
- Shut down the system and isolate pressure before servicing filters, valves, or other pressurized components.
- Depressurize the area being serviced before disassembly.
- Disconnect electrical power before performing electrical work.
- Use approved replacement parts that meet or exceed the original specification.
Quarterly maintenance
External air compressor
For systems using an external air compressor, inspect the compressor quarterly.
- Check belt condition and tension
- Wipe down accessible surfaces
- Inspect oil level
Nitrogen generator and accessories
- Clean the strainer on each AutoPurge System, if installed
- Verify that the required nitrogen purity is being maintained
- Monitor run time and investigate excessive run hours or abnormal cycling
- Inspect the system for visible leaks, alarm activity, or abnormal operating behavior
Annual maintenance
External air compressor
Systems with an external compressor require annual compressor service.
- Change compressor oil
- Replace belts as required
- Replace compressor filters
- Inspect condensate drain components for leakage and tighten as needed
Nitrogen generator and accessories
- Replace all applicable filter elements
- Rinse the inside of each filter bowl
- Clean the dryer auto-drain strainer, if applicable
- Inspect and clean the dryer aftercooler, if applicable
- Verify that required nitrogen purity is being maintained
- Review run time history and investigate abnormal operation
Filter maintenance
These models include filter maintenance functions through the controller. Filter replacement should be performed with the system shut down and depressurized.
- Confirm the filter housings are fully depressurized before opening them.
- Inspect bowls, seals, and housings during service.
- Replace worn seals or damaged housings as needed.
- Reset filter maintenance reminders after service, if applicable.
Valve replacement schedule
Valves should be replaced every 5 years as part of the major preventive maintenance interval.
What to monitor between service intervals
- Unexpected increases in run time
- Recurring alarms
- Nitrogen purity not being maintained
- Visible or audible leaks
- Frequent transitions between run and standby
If any of these conditions are observed, the system should be inspected before the next scheduled maintenance interval.
Related articles
- FPS-1650, FPS-3250, and FPS-5000 Overview
- FPS-1650, FPS-3250, and FPS-5000 Site and Utility Requirements
- FPS-1650, FPS-3250, and FPS-5000 Installation and Startup
- FPS-1650, FPS-3250, and FPS-5000 Operation, Alarms, and Maintenance
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- Phone: (910) 415-1880
- Email: support@southteksystems911.zendesk.com