This is an instruction manual for the 3M Overhead Air Ionizer 991. The product is an air ionizer designed to neutralize static charge on non-conductive objects and work surfaces in an electronics manufacturing environment. It is a standalone device for indoor use. The manual includes information on installation, operation, maintenance, and specifications.
The 3M Overhead Air Ionizer 991 neutralizes static charge on work surfaces in electronics manufacturing environments. It features three fans, bi‑color LED status, and an auto‑clean system to keep emitter points clear.
The manual covers safety guidelines, installation steps, power connections, operation procedures, maintenance tasks, specifications, and service information. It also provides details on daisy‑chaining multiple units and troubleshooting fault indicators.
| Length | 44 inches (111.8 cm) |
|---|---|
| Fan Speeds | High and low (OFF) |
| Protective Fan Filters | Open‑cell foam filters |
| Indicator LED | Bi‑Color Red/Green |
| Auto‑Clean System | Brush mechanism on each fan |
| Current Rating per Unit | 0.4 A |
| Alarm Output Jack Rating | 1.0 A, 30 V |
| Inter‑unit Power Cord | #18 AWG 3‑conductor, max 12 inches |
No, the ionizer is intended for indoor use only and must not be used outdoors.
A red bi‑color LED signals a fault condition in the high‑voltage power circuitry.
Use a #18 AWG (0.8 mm) 3‑conductor cable with a maximum length of 12 inches between units.