Norweco A20 Air Pump

Norweco A20 Air Pump Specs, NPDES Reaeration, and Ohio Service Notes

The Norweco A20 air pump is a post-aeration, or reaeration, air source used in certain approved Norweco NPDES treatment trains. It is not the main Singulair aerator, and it should not be treated like a generic aquarium or pond pump.

Post-aeration 120 volt GFCI Pressure switch Service Pro TNT NPDES dissolved oxygen
Ask about an A20 alarm Ohio NPDES guide Upload photos or records
A20 is a monitored reaeration component Power, pressure switch, tubing, mounting, ventilation, and Service Pro input all matter for Ohio NPDES performance.

Quick homeowner answer

The A20 supplies air after treatment and disinfection where the approved Norweco NPDES treatment train requires reaeration. Public Norweco installation text says the Model A20 air pump must be protected from moisture, direct sunlight, excessive heat, poor ventilation, and vertical mounting. The same text identifies a 120 volt GFCI-protected power circuit and a pressure switch tied into the Service Pro TNT control center.

Core specs to verify

ComponentModel A20 post-aeration air pump for approved Norweco NPDES configurations
Power120 volt GFCI-protected circuit in public Norweco instruction text
MonitoringPressure switch connected to Service Pro TNT Auxiliary Input 2
Airflow referenceODH/Norweco verification material lists 1.5 L/min at 50 cm depth for the tested reaeration configuration
Pressure reference0.25 kg/cm2 maximum pressure appears in the same tested configuration notes
Ohio cautionVerify the exact treatment train, permit file, failsafe, telemetry, and sampling location

A20 spec chart and source confidence

The A20 does not have the same clean public product-page footprint as the AT 1500, BK 2000, Simplex pump, or Service Pro control center. The page below separates source-backed A20 facts from service judgment so nobody fills gaps with made-up horsepower, diaphragm, tubing, or curve data.

FieldVerified A20 detailWhy it matters on site
System roleFresh air for post-aeration in Singulair Ohio NPDES instructionsIt supports final dissolved oxygen after treatment and disinfection.
Not the main aeratorSeparate from the 206C Singulair mechanical aeratorA generic air pump does not replace the in-tank treatment aerator.
Power120 volt GFCI-protected power circuitGFCI protection and dry installation matter for service safety.
MountingHorizontal orientation, indoors or in a well-ventilated weatherproof enclosureMoisture, sunlight, heat, vertical mounting, and poor ventilation can damage the pump.
Alarm monitoringPressure switch connected to Service Pro TNT Auxiliary Input 2The control center needs to know if air delivery fails.
Air reference1.5 L/min at 50 cm depth in ODH/Norweco tested reaeration configurationThis is air flow, not water flow for spray, drip, or dosing design.
Pressure reference0.25 kg/cm2 maximum pressure in tested configuration notesUse as a published reference, not a field guarantee.
1Singulair treatment

Biological treatment and clarification happen before final NPDES equipment.

2AT 1500 UV

UV disinfection treats effluent before final discharge or sampling.

3A20 reaeration

The A20 adds air where the approved train requires post-aeration.

4Sampling and discharge

The outlet must support accurate sampling and permit compliance.

A20 air pump vs 206C aerator

A20 post-aeration air pump
  • Works after treatment and disinfection where the approved NPDES train calls for reaeration.
  • Uses tubing, pressure switch monitoring, and a protected installation location.
  • Supports dissolved oxygen before discharge or sampling.
  • Should be checked with the Service Pro TNT input, air output, tubing, and sampling results.
206C Singulair aerator
  • Works inside the main aerobic treatment chamber.
  • Provides mechanical mixing and oxygen transfer for biological treatment.
  • Uses a shaft-style aerator, not an external air pump substitute.
  • Should be checked for amperage, air delivery, shaft, aspirator tip, and controls.

Symptoms of A20 trouble

  • Service Pro TNT or auxiliary alarm tied to the pressure switch.
  • Low dissolved oxygen on an Ohio NPDES sample.
  • No air, weak air, or disconnected tubing at the reaeration point.
  • Moisture, flooding, direct sun, excessive heat, or poor ventilation at the pump location.
  • GFCI trip, damaged cord, overheated pump, or unusual humming/rattling.
  • Repeated diaphragm or flapper valve issues without correcting the installation environment.

Troubleshooting logic

1Confirm the treatment trainVerify the property actually has an approved NPDES configuration that uses A20 reaeration.
2Check safe power statusLook only at safe exterior indicators. Wet electrical equipment, GFCI trips, and damaged cords need service attention.
3Verify air and pressure switchThe pump, tubing, pressure switch, conduit, and Service Pro input should be checked together.
4Connect to samplingLow dissolved oxygen can also involve upstream treatment, overload, sample point problems, or recent outages.

Maintenance tips

  • Keep the A20 powered unless a service provider instructs otherwise.
  • Keep the pump dry, ventilated, shaded from direct sun, and mounted horizontally.
  • Do not bury, seal, or block the weatherproof enclosure.
  • Have the air filter inspected at each NPDES service visit.
  • Ask whether reduced airflow points to diaphragms, flapper valves, tubing, or pressure-switch issues.
  • Keep A20, AT 1500 UV, Service Pro, sampling, dissolved oxygen, and maintenance records together.

Internal links for the next decision

Ohio NPDES septic guideUnderstand dissolved oxygen, sampling, telemetry, UV, and discharge permits. Norweco AT 1500 UVUV disinfection is commonly part of the same NPDES treatment train. Norweco 206C aeratorDo not confuse the A20 with the main Singulair treatment aerator. Bio-Kinetic filterFinal filtration and flow equalization can affect downstream UV, reaeration, and sampling.

Frequently asked questions

Is the A20 the main septic aerator?

No. The A20 is a post-aeration air pump. The main Singulair treatment aerator is a different component, such as the 206C aerator in many systems.

What does the A20 do?

It supplies air for reaeration in approved Norweco NPDES treatment trains, usually after treatment and UV disinfection.

Can I use a different air pump?

Do not substitute a different pump unless the designer, distributor, service provider, and local health district confirm it is acceptable for the approved treatment train.

Why does dissolved oxygen fail?

Possible causes include A20 failure, blocked tubing, pressure switch problems, upstream treatment issues, bad sampling, overload, or long outage history.

Official and supporting sources

ManufacturerNorweco Service Pro MCD
ManufacturerNorweco AT 1500 UV
OhioODH Norweco R3 resources
OhioOhio EPA HSTS NPDES permits
Supporting packetPublic Norweco A20 instruction text
BE OhioNorweco parts hub

Have an A20 alarm or low dissolved oxygen result?

Send photos of the pump, enclosure, tubing, pressure switch, Service Pro panel, AT 1500 UV, and the sampling report. BE Ohio can help identify whether this is a pump issue, wiring issue, sampling issue, or treatment-train problem.

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