--- product_id: 232851792 title: "A421AEC-01C Electronic Temp Control, SPDT, Gray" brand: "johnson controls" price: "₹ 32505" currency: INR in_stock: true reviews_count: 2 category: "Johnson Controls" url: https://www.desertcart.in/products/232851792-a421aec-01c-electronic-temp-control-spdt-gray store_origin: IN region: India --- # Adjustable backlit LCD display SPDT relay for precise control Wide temp range -40 to 212°F A421AEC-01C Electronic Temp Control, SPDT, Gray **Brand:** johnson controls **Price:** ₹ 32505 **Availability:** ✅ In Stock ## Summary > 🌟 Take command of your climate with precision and style! ## Quick Answers - **What is this?** A421AEC-01C Electronic Temp Control, SPDT, Gray by johnson controls - **How much does it cost?** ₹ 32505 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.in](https://www.desertcart.in/products/232851792-a421aec-01c-electronic-temp-control-spdt-gray) ## Best For - johnson controls enthusiasts ## Why This Product - Trusted johnson controls brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **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. ## Overview 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. ## Description The A421 Series Electronic Temperature Controls are single-stage controls with a single-pole, double-throw (SPDT) output relay. A421 Controls feature a bright backlit LCD with adjustable brightness and a three-button touchpad interface that can be set up to restrict user adjustments. An LED indicates the output relay's On/Off status. Standard A421 Series control modules have simple On and Off temperature settings for heating or cooling, an adjustable anti-short cycle delay, temperature setback, and sensor offset capability. The temperature control range is -40 to 212°F or -40 to 100°C. The A421 controls are available either in Type 1 (NEMA), IP20 (CE), high-impact plastic enclosures suitable for surface or DIN rail mounting or in Type 4X (NEMA), IP67 (CE) watertight, corrosion resistant surface mount enclosures. Review: excellent - excellent Review: Bastante facil de instalar y de ajustar el set-point ## Features - Easy-to-read, bright, adjustable backlit LCD screen displays the temperature - Adjustable On and Off temperature set points enable easy to set up cooling or heating - Basic and advanced programming menus allow you to easily set up your control application on the LCD using a simple three-button touchpad interface - Package Weight : 5 pounds ## Technical Specifications | Specification | Value | |---------------|-------| | 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 | ## Product Details - **Brand:** Johnson Controls - **Color:** Grey - **Display Type:** LCD - **Item Weight:** 16 ounces - **Material:** Plastic ## Images ![A421AEC-01C Electronic Temp Control, SPDT, Gray - Image 1](https://m.media-amazon.com/images/I/71z3Gh2YX1L.jpg) ## Questions & Answers **Q: 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?** A: 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 **Q: Hello, a421abc-02c- a421 series can this product use 24v dc? which model series is compatible with 24v dc please advise. with thanks,** A: I used this unit to run a Raypak pool heater which operates at 24 volts. **Q: 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?** A: 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. **Q: 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** A: 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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ excellent *by J***O on September 24, 2019* excellent ### ⭐⭐⭐⭐⭐ Review *by R***Z on July 6, 2022* Bastante facil de instalar y de ajustar el set-point ## Frequently Bought Together - Johnson Controls A421AEC-01C Electronic Temp Control, SPDT, Gray - AO Smith 9721 Multi-HP, 3.3-Inch Frame Diameter, 1/2-HP, 1550-RPM, 115,208-230-Volt, 1.1-Amp, Ball Bearing Motor - YZF18-25 Fan AC Motor 120V 18W 1.01A 60Hz Shaded Pole Condenser Motor Replace YZF10-20 YZF6-13 W0301905 for Refrigeration Equipment Radiator Evaporator Freezer, Small Ventilation Equipment 1550rpm --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.in/products/232851792-a421aec-01c-electronic-temp-control-spdt-gray](https://www.desertcart.in/products/232851792-a421aec-01c-electronic-temp-control-spdt-gray) --- *Product available on Desertcart India* *Store origin: IN* *Last updated: 2026-04-30*