This article applies to South-Tek Systems N2-BLAST FPS-500 and FPS-900 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 and associated accessories.
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
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
Nitrogen generator and accessories
- Replace all applicable filter elements
- Rinse the inside of each filter bowl
- Verify that required nitrogen purity is being maintained
- Review run time history and investigate abnormal operation
Filter maintenance
These models use an annual filter replacement kit. Clean filter elements are important for generator performance and longevity.
- Annual filter replacement kit part number is FRP-007.
- Filters should be replaced once per year or every 1000 hours, whichever comes first.
- Shut down and depressurize the system before opening any filter housing.
- Inspect bowls, seals, and housings during service.
- 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
- N2-BLAST Fire Protection Systems Overview
- FPS-500 and FPS-900 Overview
- FPS-500 and FPS-900 Site and Utility Requirements
- FPS-500 and FPS-900 Installation and Startup
Manual downloads
Need additional support?
- Phone: (910) 415-1880
- Email: support@southteksystems911.zendesk.com