Airmaster (aftermarket)
Common retrofit choice for mixed-brand plants because it can talk to Kaeser, Atlas Copco, IR, and dry-contact-only compressors in one system. Setup is site-specific — always keep the as-built I/O map with the panel.
Manufacturer
Airmaster Controls (independent)
Display
Varies — typically 4.3" or 7" color touch (recent generations).
Years produced
~2000 – present, multiple hardware generations.
Power supply
120 VAC panel input with 24 VDC control bus.
Ambient range
0 – 50 °C typical enclosure.
Protection rating
NEMA 12 / IP54 typical panel.
Relay outputs
One remote start/stop + one load/unload dry contact per managed compressor (typ. 4–16 units).
Used on
- Sequencing panels retrofit across mixed OEM fleets
- Cross-brand demand-based system controllers
Features
- Cascade / target-pressure sequencing across mixed brands
- Base / trim rotation to equalize hours
- Data logging & alarming
- Runtime / kW estimation reports
Interfaces
- Modbus RTU / TCP
- Digital I/O
- Analog 4–20 mA pressure
- Optional cellular gateway
Sensor inputs
- 4–20 mA system pressure
- Optional 4–20 mA dewpoint / flow
- Digital run / alarm feedback per compressor
Fault code lookup
First checks
- Check RS-485 wiring & termination
- Verify address & baud on target controller
- Confirm 24 V on comms module
First checks
- Verify demand vs installed capacity
- Check for stuck-open bypass or large leak
- Confirm base unit loading
First checks
- Check for stuck-loaded compressor
- Verify unload commands reach unit
- Confirm setpoints
First checks
- Read alarm on the unit's own HMI
- Clear at unit, then at Airmaster
Fault list is non-exhaustive and firmware-dependent. Always confirm against the controller’s on-screen help or OEM manual.
Sensor pin resistance & signal values
Pin-level resistance and signal values for the sensor types this controller uses. Works offline. De-energise the panel and lift one lead before ohming any element.
Wiring notes
- Typically 120 VAC panel with 24 VDC control
- Each managed compressor gets remote start/stop + load contact wired to Airmaster I/O
Known issues & field notes
- Site-specific I/O maps — always retain as-built drawings inside the panel door
- Older RS-485 loops sensitive to ground loops — use isolators between buildings
Retrofit notes
Best used with an in-line pressure/flow transducer downstream of the storage receiver and dryers. Set target 3–5 psi below the lowest unit's unload to avoid setpoint fights.
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