Johnson Controls AS-UNT120-0 Low Temp Unitary Controller [Refurbished]

The Johnson Controls AS-UNT120-0 is a Metasys Unitary Controller (UNT) from the low-ambient UNT120 family, an Application Specific Controller for single-zone and room-level HVAC equipment. The UNT120 configuration is the low-temperature version of the UNT110, with no analog outputs, and it is rated to operate down to -40°F rather than the 32°F floor of the standard models.

The UNT is a stand-alone digital controller that also communicates on the Metasys N2 Bus, so a Network Control Unit or operator workstation can share sensor data and schedules across the facility. Two banks of DIP switches configure the analog input points and set the N2 address. Binary outputs are triacs that switch 24 VAC to relays, solenoids and actuators; on the UNT120/121 series the terminal labelled TRIACS is the internal shared node of the triac outputs, allowing high-side or low-side switching. A two-wire Zone Bus lets a laptop or a Zone Terminal communicate with the controller, download its database and reach M100 Series motor actuators. Application configuration is built, downloaded and commissioned with HVAC PRO for Windows. Johnson Controls requires the UNT120 and UNT121 to be installed in a BZ-1000-7 or equivalent enclosure. As a -0 generation controller it is supported by the AS-ZTU100-0 Zone Terminal.

* Brand / Manufacturer: Johnson Controls
* Model / Part Number: AS-UNT120-0
* Series: Metasys UNT Series Application Specific Controller
* Product Type: Low-ambient unitary controller
* Analog Outputs: 0
* Binary Outputs: 24 VAC triacs
* Supply Power: 24 VAC, 50/60 Hz
* Communication: Metasys N2 Bus; 2-wire Zone Bus for room sensor and service tool
* Required Enclosure: BZ-1000-7 or equivalent
* Generation: -0 series (supported by AS-ZTU100-0 Zone Terminal)
* Configuration Software: HVAC PRO for Windows
* Agency Listings: UL Listed and CSA Certified as part of the Metasys Network

Typical applications include rooftop units, outdoor air handlers, make-up air units, heat pumps and other exposed equipment locations where the controller must operate below freezing, with staged on/off control of fans, valves and electric heat.. Johnson Controls. Johnson Controls. AS-UNT120-0.