ELGi EN Series oil-flooded screw
ELGi's mainstream oil-flooded screw line covering 5–100 hp in fixed-speed and variable-speed builds, controlled by the Neuron family of controllers.
- Load/unload
- Continuous
- Auto stop/start
- VFD (variable speed variants)
- General plant air
- Automotive and fabrication shops
- Packaging lines
Specs & intervals below are from publicly published OEM literature and long-standing field practice. Torque values, exact revision-dated part numbers, and safety-critical settings vary by serial number — always cross-check the unit’s OEM manual and nameplate before ordering parts or performing service.
Fluid selection is temperature and duty dependent — use the machine's own chart, not a generic one.
| Category | Interval | Source |
|---|---|---|
| Air filter element | 2,000 hr or on ΔP | |
| Oil filter | 2,000 hr (first change earlier after commissioning) | |
| Separator element | 4,000 hr or on rising ΔP | |
| Inlet valve kit | Rebuild at 8,000 hr | |
| Minimum pressure valve kit | Rebuild at 8,000 hr | |
| Motor bearings | Regrease per the plate; replace per OEM hours |
Consumable part numbers change by revision and region — pull the current number from the OEM portal.
- Check fluid level in sight glass at running temp
- Listen for unusual noise / vibration
- Check discharge pressure & temperature vs baseline
- Verify condensate drain function
- Log package amps if metered
- Blow down receiver and drain traps
- Check for oil carryover at first drop leg
- Inspect for fluid or air leaks around airend and separator tank
- Verify safety valve is not weeping
- Change fluid filter
- Change air filter (or sooner per ΔP)
- Sample fluid for TAN / metals / water
- Clean cooler exterior with low-pressure air (never > 30 psi against fins)
- Change separator element
- Change fluid
- Inspect scavenge line & orifice for coking
- Check coupling / belt alignment & wear
- Torque electrical lugs to spec (typ. 45–75 in-lb #4–2/0 AWG)
- Rebuild inlet valve
- Rebuild minimum-pressure check valve
- Regrease or replace motor bearings per OEM interval
- Verify safety valve setpoint against gauge
- High airend discharge temperature — cooler face fouling, low fluid, or a stuck thermal valve
- Won't load — Neuron output, load solenoid coil, or a plugged pilot line
- High separator ΔP — element past interval or wrong fluid
- Motor overload trip on Y-Δ transition — contactor timing or a weak transition contactor
- ELGi Neuron II — Backlit LCD with membrane keys and status LEDs
- ELGi Neuron XT — Graphic LCD showing package discharge pressure, discharge temperature and machine status
- Value pricing against the majors
- Simple, serviceable package layout
- Neuron controllers are straightforward to navigate
- Parts availability depends on local distributor strength
- Documentation is thinner than the top-tier brands
Range and control detail from published ELGi literature and the public Neuron manuals. Confirm frame-specific CFM against the nameplate.