Io Hvac Controls MD-2018 Zone Damper 20x18 in Belimo 3 Wire

Product Description

The IO HVAC CONTROLS MD-2018 is a rectangular two-position zone damper designed for use in zoned HVAC duct systems. Sized at 20 inches by 18 inches, it ships with a Belimo three-wire actuator that drives the blade between fully open and fully closed positions. Two-position operation keeps controls simple and reliable, making this damper a common choice for residential and light commercial zoning applications. Licensed HVAC technicians install this component as part of a zone control system, typically paired with a zone control board and low-voltage thermostat wiring. The assembled unit weighs 12 pounds and arrives ready for duct installation.

This damper fits into rectangular supply or return duct runs where zone-by-zone airflow control is required. It is suited for residential forced-air systems and light commercial applications where a dedicated zone calls for independent temperature control. The Belimo three-wire actuator provides proven, field-tested actuation with straightforward wiring to standard zone control boards. Installers working on multi-zone systems with existing Belimo-compatible controls will find the wiring interface familiar and direct.

Key Features

• 20-inch by 18-inch rectangular blade fits standard duct openings of that nominal size
• Two-position operation moves damper fully open or fully closed for straightforward zone control
• Belimo three-wire actuator included, compatible with standard low-voltage zone control boards
• Factory-mounted actuator reduces field assembly time during installation
• 12-pound assembled weight suitable for both horizontal and vertical duct orientations

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for rectangular duct systems requiring two-position control with a Belimo three-wire actuator interface.

Installation Notes

Installation should be performed by a licensed HVAC technician. Shut down the air handler and de-energize the zone control system before connecting actuator wiring. Secure the damper to the duct using sheet metal screws and seal all joints with approved duct tape or mastic to prevent air bypass. Follow the zone control board manufacturer's wiring diagram for three-wire actuator connections and verify low-voltage circuit integrity before restoring power.