FPS-500 and FPS-900 Installation and Startup – South-Tek Systems

This article applies to South-Tek Systems N2-BLAST FPS-500 and FPS-900 fire protection nitrogen generators.

Use this article as a general installation and startup guide for the FPS-500 and FPS-900. Always review the project-specific installation package and general arrangement drawing before installing or energizing the unit.

Before installation

Confirm the exact model number on the unit nameplate.
Verify the installation location is indoors, nonhazardous, and within the required ambient temperature range.
Confirm the mounting surface can support the unit safely.
Confirm power matches the intended unit configuration.
Plan the drain connection and nitrogen tank layout before mounting the cabinet.
Keep all gas lines dry before hookup.

Receiving and preparation

Remove the unit carefully from the shipping carton and set it on a flat surface.
Prepare the wall mounting bracket before moving the unit to its final location.
Remove the four painted shipping bolts underneath the cabinet before startup to free the compressor vibration isolators.
Keep the unit upright during handling and storage.

Mounting requirements

Mount the unit upright on a weight-bearing wall or suitable rack structure.
Install the unit indoors and away from accidental damage by water, steam, heat sources, or moving equipment.
Leave at least 6 inches on the side of the cabinet for ventilation.
Provide at least 36 inches of front clearance for maintenance access, tubing connections, and front cover removal.
Plumb the 1/4" OD drain port at the bottom right of the cabinet to the nearest site drain.

Wall mounting bracket notes

The wall mounting bracket kit is designed for standard 16 inch wall stud spacing.
All mounting holes use 1/4 inch hardware.
If wall studs are not 16 inches on center, reinforce the mounting area before hanging the unit.
Secure the cabinet at both the top and bottom flanges.

Tank and piping arrangement

Install the nitrogen tank in the recommended arrangement shown in the project documentation.
Secure the nitrogen tank brackets and strap assembly properly.
All N2-BLAST FPS models are factory equipped with 1/2" NPT female connections unless otherwise noted.
An air maintenance device is recommended in the downstream piping arrangement.

Electrical connection notes

These systems require hard wiring.
Power cords are not included.
Final electrical connection should be completed by a qualified electrician in accordance with local and site requirements.
Verify voltage and frequency match the intended unit configuration before energizing the system.

Panel and gas connection checks

Before energizing the unit or opening any valves, confirm all connections are correct. The external service points include main power, drain connection, nitrogen storage pressure gauge, audible alarm, and the bypass and inlet valve arrangement.

Double-check all connection locations before startup.
Use Teflon tape or a similar thread sealant on all fittings to help prevent leaks.
Make sure all fittings, piping, and gas lines are installed correctly before pressurizing the system.

Startup procedure

Complete the installation and mounting steps.
Verify the power connection is correct.
Turn the 3-way ball valve on the generator’s left side to the Nitrogen Out position.
Open the inlet ball valve on the nitrogen storage tank.
Close the outlet ball valve on the nitrogen storage tank.
Push the power button on the left side to the On position.
Allow the air compressor to start and the unit to run.
Once the system is running, close the tank inlet ball valve and monitor the pressure gauge on the front lower left side of the generator.
The pressure should rise to approximately 65 to 70 PSIG within 2 minutes or less.
Once that pressure is reached, the system should enter Standby mode and automatically shut off the internal air compressor.
While the unit is in standby, note the tank pressure and monitor for pressure loss.
If pressure remains stable, slowly open the nitrogen outlet valve to the air maintenance device and monitor for leaks.
After startup, the nitrogen generator will automatically run and shut off as needed based on internal tank pressure.

Leak check during startup

Always leak check every line before placing the system into service. Line leaks will cause the generator to run excessively, shorten compressor life, and increase wear on the system.

If pressure drops while the unit is in standby, check all external connection points for leaks.
If a leak is found, shut off the affected valve, stop the unit, depressurize the leaking area, and correct the issue before restarting.
If an internal leak is suspected, remove the cover and inspect carefully. Only use factory-approved replacement parts.

Important notes

These systems are not intended for quick fills.
The built-in compressor is used for nitrogen generation only.
If a nitrogen bypass system is required by code, follow the project-specific installation drawing.
Improper installation can result in damage, unsafe operation, and voided warranty coverage.

Manual downloads

Need additional support?

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