The Johnson Controls AS-UNT141-1 Unitary (UNT) Controller is an electronic device for digital control of packaged air handling units, unit ventilators, fan coils, heat pumps, and other terminal units serving a single zone or room. It can also be configured as a generic input/output device for basic point monitoring applications when used within a Metasys Network. You can easily configure point inputs and outputs and software features to control a wide variety of HVAC equipment applications. You may use the UNT as a standalone controller or connected to the Metasys Network through a Network Control Module (NCM), N30, or Companion Supervisory Controller.
Features
The AS-UNT141-1's standalone control enhances system reliability. Network communications over N2 bus provide facility-wide control efficiencies and cost effective sensor sharing while multiple modes of operation for various occupancy conditions provide comfort with economy. The removable N2 and 24 VAC power plugs allow disconnection of an individual controller without disrupting other controller connections and the built-in control program library within HVAC PRO software tool allows for easy configuration. Multiple packaging options for both field and factory installations allow for installation flexibility. Includes isolated N2 circuitry for more reliable operation, and an LED indicator for Power/Zone Bus to provide visual indication of proper system function.
Application/Software Options
| APPLICATION OPTIONS | SOFTWARE OPTIONS |
| Primary Equipment Types | Unit Vents, ASHRAE Cycle 1, ASHRAE Cycle 2, ASHRAE Cycle 3, ASHRAE Cycle W, Heat Pumps, Water to Air, Air to Air, Packaged Rooftops, Fan Coils |
| Primary Control Strategies | Room/zone control |
| Economizer Changeover Strategies | Dry bulb, Outside air enthalpy, Differential outside/return air temperature, Binary input from external economizer, Supervisory network command |
| Mixed Air Control Strategies | Proportional output to OA/RA damper actuator, Binary output to economizer actuator |
| Heating/Cooling Configuration | Modulated single coil, Staged (2-stage max), Modulated common heating/cooling coil, Reversing valve logic |
| Fan Start/Stop | Continuous Operation, Cycled with call for heating/cooling |
| Lighting Control | On and off outputs to lighting relay in conjunction with Occ/Unocc mode |
| Unoccupied Control | Setup and setback, morning warmup and cooldown |
| Pump Led / Lag | Lead/Standby pumps with common or separate flow switch(s) |
Product Specifications
| Termination
Type |
Screw
Terminal |
| Analog Inputs |
6
- RTD Temp. Elem. (NI, SI or PT)
- 0-10 VDC Trans.
- 2K ohm Setpoint Potentiometers
|
| Binary Inputs |
4
- 4-Dry Contacts
- 1-Momentary Push Button at Zone Sensor
- BI4-Accum. Input
|
| Analog Outputs |
2
|
| Binary Outputs |
6
- 24 VAC Triacs at 0.5 amps
- Low or High Side Common Selectable
|
| Ambient Operating Conditions |
0 to 60°C (32 to 140°F) and 10 to 90% RH |
| Dimensions (H x W x D) |
165 x 163 x 56 mm (6.5. x 6.4 x 2.2 in.)
without enclosure
173 x 185 x 119 mm (6.8 x 7.3 x 4.7 in.) with enclosure |
| Ambient Storage Conditions |
-40 to 70°C (-40 to 158°F) 10 to 90% RH |
| Power Requirements |
24 VAC, 50/60 Hz at 40 VA (per typical
system) |
| N2 Bus |
Isolated |
| Zone Bus |
8-Pin Phone Jack or Terminal Block on
Controller |
| Shipping Weight |
0.64 kg (1.4 lbs) |
| Agency Compliance |
CSA C22.2 No. 205, FCC Part 15, Subpart J,
Class A, IEEE 446, IEEE 472, IEEE 518, IEEE 587 Category A, UL 916, UL
864; NEMA ICS 2, Part 2-230, VDE 0871 Class B |
| Agency Listings |
UL Listed and CSA Certified as part of the
Metasys Network |
