This unit will only let me set the off temperature, no other menu will display, and I cannot find any info on tech support. can anyone help?

Press the menu button 1 time, OFF will appear. Then press the up arrow 1 time to move to ON. Then press menu button 1 time and use arrow buttons to set desired temp. Press menu button to save new setting. You must push menu button after adjusting to save new setting

Hello, a421abc-02c- a421 series can this product use 24v dc? which model series is compatible with 24v dc please advise. with thanks,

I used this unit to run a Raypak pool heater which operates at 24 volts.

I see a comment that it's only 120v, although description says 120/240. I have a 240v power source. What are the input/output voltages?

I have only used mine on 120 V. However according to A421 Series Standard Electronic Temperature Controls Installation Instructions A421ABC-x, A421AEC-x, A421GBF-x, A421GEF-x Part No. 24-7664-3019, Rev. D Issued March 2016 the enclosed instructions Page 5 figure 4, the A421 can be used on 240 v.

Does this control Heating and cooling at the same time (for fermenting then curing chamber)? Or do I have to unplug the fridge and plug in the heater

Hello, Thank you for your question. This unit only controls one component at a time, so you would have to disconnect the fridge to run a heater. You also have to change the functionality of the controller to heat mode if switching from cooling to heating or vice versa. Please let us know if there are any other questions we can answer. Best Wishes, Emmie Beverage Factory 800.710.9939

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Description

🌟 Take command of your climate with precision and style!

SEAMLESS INTEGRATION - Single-stage SPDT relay output delivers reliable, precise switching for HVAC applications.
BUILT TO LAST ADAPT - Durable enclosures with IP20 or IP67 ratings for versatile mounting and environmental resistance.
CRYSTAL CLEAR CONTROL - Bright, adjustable backlit LCD ensures effortless temperature monitoring anytime.
SMART SAFETY FEATURES - Anti-short cycle delay and sensor offset protect your system and optimize performance.
PRECISION AT YOUR FINGERTIPS - Simple three-button touchpad lets you customize heating/cooling set points with ease.

The Johnson Controls A421AEC-01C is a robust single-stage electronic temperature controller featuring a bright, adjustable backlit LCD and a user-friendly three-button interface. It supports a wide temperature range (-40 to 212°F) with customizable on/off set points, anti-short cycle delay, and sensor offset. Designed for durability, it comes in IP20 or IP67 rated enclosures suitable for various mounting options, making it ideal for professional HVAC control applications.

Specifications

ASIN	B01IWJO5WY
Best Sellers Rank	#476,063 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #883 in Temperature Controllers
Date First Available	October 27, 2016
Global Trade Identification Number	10662011536656
Item Weight	1 pounds
Item model number	A421AEC-01C
Manufacturer	Johnson Controls Inc
Package Dimensions	11.1 x 4.3 x 4.2 inches

Reviews

J**O

excellent

24.09.2019

R**Z

Bastante facil de instalar y de ajustar el set-point

6.07.2022

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