Johnson Controls AS-UNT121-1 — Controller With Heater

Part number	AS-UNT121-1
Brand	Johnson Controls
Category	Controller
Description	Controller With Heater
Manufacturer	Johnson Controls
Product Type	Controller with Heater
Product Line	Metasys AS
Part Number	AS-UNT121-1
Weight	1.31 lbs (0.60 kg)
Power Requirements	24 VAC, 50/60 Hz at 40 VA
Power Draw	10 VA (400 mA)
Ambient Operating Conditions	0 to 52°C (32 to 125°F)
Ambient Storage Conditions	-40 to 70°C (-40 to 158°F)
Processor	80C652
Memory	32K RAM, 64K ROM, 8K EEPROM
Interfaces	N2 and Zone Bus
Analog Inputs	6 (RTD temperature elements, setpoint potentiometers, transmitters)
Binary Inputs	4 (24 VAC input, momentary pushbutton)
N2 Bus	Isolated

The AS-UNT121-1 UNT Controller, crafted by Johnson Controls, serves as a pivotal electronic device for precision control of HVAC systems. It's designed for single-zone devices and features programmable inputs and outputs for smooth connection with the Metasys Network. It operates dependably under various circumstances thanks to its 24 VAC, 50/60 Hz power supply and inbuilt heater. The 80C652...

Compatibility data for this part number is being verified. Send an RFQ with your equipment model and serial — our suppliers confirm fitment before quoting.

Data compiled from 1 verified source. Last reviewed 2026-08-16.