Belimo LM230A Actuator Terminal Mapping

The Belimo LM230A is a line-voltage damper actuator operating at AC 100…240V. It features a 3-wire connection that can be wired for either Open/Close (2-point) control or 3-point (floating) control. 

To read more about  3-point (floating) control, please click here: https://wearehvac.com/3-point-floating-control-in-hvac/

The three wires correspond directly to the schematic labeled on the product plug (1, 2, and 3): 

• Wire 1 (Blue): Neutral (N)
• Wire 2 (Brown): Live / Line (L)
• Wire 3 (White): Control / Signal Line (L) [1]

Wiring Method 1: Open / Close Control (2-Point)

Use this setup if you want the actuator to fully drive open when a single switch (like a thermostat or relay) closes, and drive back to its original position when the switch opens.

1. Connect the Blue wire (1) directly to the permanent Neutral (N) line.
2. Connect the Brown wire (2) directly to the permanent Live (L) line.
3. Route the White wire (3) through your control switch/relay contact, connecting it to the Live (L) line.

• Switch Open: The actuator turns to its resting position.
• Switch Closed: The actuator powers up and drives to the opposite end position.

Wiring Method 2: 3-Point Control (Floating)

Use this setup if your controller has separate command paths for opening and closing, or if you need to stop the damper at mid-way intervals.

1. Connect the Blue wire (1) directly to the permanent Neutral (N) line.
2. Connect the Brown wire (2) to the “Close” or counter-clockwise command line (Live).
3. Connect the White wire (3) to the “Open” or clockwise command line (Live).

• Power on Wire 2 only: Actuator turns in direction 0.
• Power on Wire 3 only: Actuator turns in direction 1.

Important Setup Steps

• Direction Switch: Look under the black rubber cover on the top face of the actuator to find the 0 / 1 direction switch. This sets whether the motor turns clockwise or counterclockwise when receiving a signal. 
• Manual Override: If you need to manually turn the actuator during installation, press and hold the black push-button located on the top cover to disengage the gear train.