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

Common fault codes

Comm Loss (unit N)Lost communication with compressor N.

First checks

Check RS-485 wiring & termination
Verify address & baud on target controller
Confirm 24 V on comms module

See trigger conditions & affected models →

Low System Pressure System pressure below alarm setpoint.

First checks

Verify demand vs installed capacity
Check for stuck-open bypass or large leak
Confirm base unit loading

See trigger conditions & affected models →

High System Pressure System pressure above alarm.

First checks

Check for stuck-loaded compressor
Verify unload commands reach unit
Confirm setpoints

See trigger conditions & affected models →

Compressor N Fault Alarm relay from compressor N asserted.

First checks

Read alarm on the unit's own HMI
Clear at unit, then at Airmaster

See trigger conditions & affected models →

Fault list is non-exhaustive and firmware-dependent. Always confirm against the controller’s on-screen help or OEM manual.

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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