N2-GEN™ 4 Deployable / NM400 — Maintenance & Troubleshooting – South-Tek Systems

Applies to: N2-GEN™ 4 Deployable (hard case) and N2-GEN™ 4 / NM400 (standalone)

Does NOT apply to: N2-GEN™ HPC Deployable (HPCD) — see N2-GEN™ HPC Deployable article set

This article covers all scheduled maintenance tasks, filter and membrane service procedures, and troubleshooting for the most common fault conditions. Always power down and unplug the system before opening the cabinet or servicing any component.

🛑 Membrane Damage Warning: Overdue or saturated filter elements allow moisture and oil to pass through to the membrane elements. Membrane damage caused by failed filtration is permanent and not covered under warranty. Never operate the system with overdue filters or when the Filter Service light is illuminated.

Maintenance Schedule

ℹ Configuration Difference — Filter Intervals: The Deployable and Standalone / NM400 configurations have different recommended filter replacement intervals due to differences in intended operating environments. Follow the schedule for your configuration.

Component / Task	Deployable (Hard Case)	Standalone / NM400	Part Number
All 3 filter elements (inspect)	Every 500 hours or 6 months	Every 125 hours or 2 months	—
All 3 filter elements (replace)	Every 1,000 hours or 12 months	Every 250 hours or 4 months	FRP-001
Membrane elements (replace)	Contact South-Tek Systems — service at South-Tek facility		400-129 (×2)
Air compressor (replace)	Contact South-Tek Systems — service at South-Tek facility		Contact South-Tek

⚠ Harsh Environments: In unusually dusty, dirty, or contaminated environments, filters should be inspected more frequently than the schedule above and replaced earlier if the elements are visibly dirty or if nitrogen purity drops. Contact South-Tek Systems to discuss an adjusted maintenance schedule if operating in demanding conditions.

Filter Replacement Procedure

The N2-GEN™ 4 contains three filter elements that must be replaced together as a set (part FRP-001). Replacing only some filters and not others is not recommended — replace all three at the same time.

Filter Locations

Filter	Location	Identification
Pre-compressor (air intake)	Top of the air compressor	Twist-on cap; no bowl
General purpose (particulate)	Right side of cabinet, closer to the rear	Clear bowl; pink/white filter element
Coalescing	Right side of cabinet, closest to the front	Clear bowl; green filter element

Replacement Steps

🛑 Before Opening the Cabinet: Always disconnect power and unplug the unit before removing the cabinet cover. Relieve all internal pressure before opening any filter bowl. The compressor may be hot — allow it to cool before reaching inside the cabinet.

Turn the power switch to Off and unplug the power cord from the outlet.
Remove the six (6) 10×32 screws from the cabinet cover and set the cover aside.
Relieve all internal pressure before proceeding.
Pre-compressor filter: Twist the filter cap clockwise to remove. Pull out the old filter cartridge and insert the new one. Reinstall the cap.
General purpose and coalescing filters: Remove each filter bowl by pushing up on the bowl and twisting counterclockwise one-eighth of a turn — it will then pull straight down.
- A rubber O-ring may come out with the bowl. If it does, reseat it in the housing before reinstalling the bowl.
- Unscrew the filter cartridge from inside the housing and replace with the new element. Pink/white element goes in the rear (general purpose) filter; green element goes in the front (coalescing) filter. Do not swap them.
Before reinstalling the bowls, confirm the auto-drain float is seated all the way to the bottom of each bowl. The float must be in place — the system will not function correctly without it.
Reinstall both filter bowls by reversing the removal steps.
Reinstall the cabinet cover and all six screws.
Plug in the power cord and turn the system on.
If the storage tank is already full and the system does not restart, relieve a small amount of pressure by pulling the safety relief ring located in the upper left corner inside the cabinet, until pressure drops and the system cuts back on.
With the system running, listen and feel around all filter connections for leaks. Confirm the pressure gauge on the filter assembly reads 110–120 PSIG. If pressure is lower, a leak is present — power off, depressurize, and inspect all fittings before resuming.

Membrane Elements

The two hollow-fiber membrane elements (part 400-129) are located at the rear of the generator cabinet — two long grey tubes mounted vertically. Membranes have a service life that depends heavily on filter maintenance. Running the system with overdue filters is the primary cause of premature membrane failure.

ℹ Signs of Membrane Degradation: A gradual decrease in nitrogen purity over time — with filters confirmed fresh and no leaks present — is the primary indicator that membranes are approaching end of life. Nitrogen purity that cannot be recovered after a filter change should be reported to South-Tek Systems. Do not attempt to clean or repair membrane elements.

Membrane replacement requires opening the cabinet, disconnecting all push-on fittings, cutting and replacing cable ties, and carefully reconnecting all tubing in the correct orientation. The membrane tuning valve is factory-set and must not be adjusted during this process or at any other time. If membrane replacement is needed, contact South-Tek Systems at (910) 415-1880 for guidance or to arrange service.

Troubleshooting

System Will Not Power On

Probable Cause	Corrective Action
No power supply	Confirm the power cord is fully plugged into a live 110 VAC / 20 Amp outlet; verify the circuit breaker has not tripped
Blown 8-amp fuse	Replace the 8-amp inline fuse on the control panel; investigate the root cause if the fuse blows again (part 400-133)

System Powers On But Compressor Does Not Run

Probable Cause	Corrective Action
Storage tank already at cut-out pressure	System is in normal Standby mode — the Standby (amber) light should be illuminated. No action required; compressor will restart automatically when pressure drops.
BlastOff™ alarm active (if equipped)	Find and correct the leak; cycle power to reset. See BlastOff™ troubleshooting below.

Compressor Runs But System Never Enters Standby

Probable Cause	Corrective Action
External leak in gas lines or fittings	Perform the external leak check procedure from the Installation & Startup article; repair any leaks found
Internal leak	If no external leak is found, open the cabinet and carefully feel around all internal hoses and push-on fittings by hand; repair any disconnected or damaged connections
Pre-compressor filter severely clogged	Replace the pre-compressor filter element; check if filter pressure gauge reads 110–120 PSIG after replacement
Pressure switch malfunction	If no leaks are found and filter pressure is correct, the cut-out pressure switch may be faulty — contact South-Tek Systems

Low or No Nitrogen Output Pressure

Probable Cause	Corrective Action
Storage tank outlet valve closed	Open the storage tank outlet valve fully
Downstream leak	Check all downstream fittings and hose connections; repair leaks found
Compressor output pressure low (filter gauge below 110 PSIG)	Replace all three filter elements; if pressure remains low after filter change, check for internal leaks and contact South-Tek Systems

Low Nitrogen Purity

Probable Cause	Corrective Action
Filter elements overdue or saturated	Replace all three filter elements immediately using FRP-001; allow system to run through a full pressurization cycle before testing purity again
Ambient temperature too high	Confirm ambient temperature is within the rated range for your configuration (40–90°F Deployable / 35–90°F Standalone). Membrane performance degrades in high ambient temperatures.
Membrane elements degraded or damaged	If purity remains low after a confirmed fresh filter change with correct pressure and temperature, membranes may be at end of life — contact South-Tek Systems

Filter Service Light Illuminated

The Filter Service light (red) illuminates when the Electronic Service Indicator detects that a filter element is saturated. Replace all three filter elements immediately using FRP-001. The light will reset the next time the system is powered on after the filter change.

ℹ Brief Flicker Is Normal: The Filter Service light may illuminate briefly (under 5 minutes) during initial startup while the system is coming up to pressure. This is normal. If the light remains on after 5 minutes of operation, filters must be replaced immediately.

BlastOff™ Alarm Repeating (if equipped)

Probable Cause	Corrective Action
Leak not yet corrected	Perform a thorough external and internal leak check per the Installation & Startup article; do not use power cycling as a permanent fix
BlastOff™ sensor sensitivity	If no leak can be found after a thorough inspection, contact South-Tek Systems — the sensor may need calibration or replacement

When to Contact South-Tek Systems

Low nitrogen purity that does not recover after a confirmed fresh filter change
Internal leaks that cannot be identified or repaired with factory parts
Filter assembly pressure gauge consistently reading below 110 PSIG with fresh filters installed
Fuse blows repeatedly after replacement
System never enters Standby with no leaks found
Any membrane replacement or compressor service
Any condition that cannot be resolved using this article

Contact South-Tek Systems

Phone: (910) 415-1880

Email / Ticket: support@southteksystems911.zendesk.com