FPS-10000, FPS-16500, and FPS-22500 Operation, Alarms, and Maintenance – South-Tek Systems

This article applies to South-Tek Systems N2-BLAST FPS-10000, FPS-16500, and FPS-22500 fire protection nitrogen generators.

Use this article for normal operating behavior, controller functions, alarm conditions, leak detection guidance, and routine maintenance for the FPS-10000, FPS-16500, and FPS-22500.

Normal operation

These systems automatically cycle between running and standby based on nitrogen storage tank pressure.

In Running mode, the system is producing nitrogen and supplying it to the storage tank.
When the tank reaches the cut-out pressure, the system enters Standby.
When pressure drops back to the cut-in point, the system automatically resumes nitrogen generation.

This automatic cycling is part of normal operation. Do not adjust the factory preset cut-in and cut-out pressure without first consulting South-Tek Systems.

Touchscreen and controller functions

The FPS-10000, FPS-16500, and FPS-22500 use a PLC with touchscreen interface to monitor and manage system operation.

Home screen: Provides access to the dashboard, operation screen, graphs, alarms, product information, settings, maintenance functions, alarm settings, communication settings, and factory settings.
Start/Stop control: Hold the Start/Stop button for about 1 second to change the system state.
Dashboard: Displays key system information such as operating status, pressure, and applicable sensor values.
Graphs and logs: These models support SMART-Trak sensor graph logs, sensor data logs, system performance logs, equipment status logs, N2 leakage logs, and bypass logs.
System settings: Includes N2 pressure settings, sensor calibration, and bypass settings.
Maintenance menu: Includes valve controls, alarm contact testing, and filter maintenance functions.

Alarm categories

These models support six alarm categories through the control system.

General Alarm Settings
Purity Alarm Settings
BlastOff Alarm Settings
N2 Pressure Alarm Settings
Bypass Alarm Settings
Equipment Status Alarm Settings

General alarm settings

The General Alarm Settings screen allows the user to turn alarm buzzers on or off and adjust timing-related alarm behavior.

Purity alarm settings

If the unit includes an oxygen sensor, purity alarm points and alarm cut-out points can be adjusted through the controller.

BlastOff alarm

BlastOff is a leak-detection feature that can send audible, visual, and dry-contact alarm signals if the system detects a possible gas leak or abnormal nitrogen demand.

The BlastOff system or buzzer can be turned on or off through the settings screen.
The timer setting and countdown can also be viewed and adjusted through the controller.
Repeated resets without correcting the root cause can shorten generator life.

Bypass alarm

The system supports bypass alarm settings and bypass status monitoring through the controller.

Equipment status alarms

These models can also indicate equipment-related alarm conditions, including compressor, dryer, and filter issues where applicable.

Leak checking

Leak checks are an important part of both startup and ongoing support. Leaks can cause excessive run time, nuisance alarms, and unnecessary wear on the system.

Listen for leaks and use soapy water around non-electrical connection points.
If a leak is found, isolate the affected area and relieve pressure before making repairs.
If no leak is obvious, isolate sections and monitor for pressure loss.

Checking for leaks between the generator and the nitrogen storage tank

With the unit powered on, close off the nitrogen outlet ball valve and note the storage tank pressure.
Allow the system to continue running. Within 10 minutes or less, it should reach Standby mode.
Wait 5 minutes.
If the system remains in standby, the leak is likely after the nitrogen generator.
If tank pressure changes, the leak is likely within the storage tank fittings.
If tank pressure does not change, check the building piping for leaks.
If the system returns to run mode, the leak is likely within the cabinet.

Routine maintenance

Routine maintenance is important for reliable nitrogen generation, proper alarm function, and long-term system life.

Inspect the system regularly for abnormal alarms, leaks, and excessive cycling.
Replace filter elements on schedule and investigate abnormal run time or nuisance alarms.
Use the filter maintenance and alarm functions on the controller to monitor service status where applicable.
Replace valves on a 5-year schedule.

Filter maintenance

These models include a standard filter set consisting of particulate, coalescing, and absorber filters. Clean filter elements are important for generator performance and longevity.

Annual filter replacement kit part number is FRP-013 for FPS-10000.
Annual filter replacement kit part number is FRP-006 for FPS-16500 and FPS-22500.
Black filter housings use the filter kits listed above.
Newer-style white filter bowls use FRP-022 for all three models.
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.

When to get support

Contact support if the system does not enter standby as expected, repeatedly returns to run mode without demand, experiences recurring BlastOff or equipment alarms, or shows signs of internal leakage or recurring performance issues.

Manual download

FPS-10000, FPS-16500, and FPS-22500 O&M Manual

Need additional support?

Phone: (910) 415-1880
Email: support@southteksystems911.zendesk.com