{"product_id":"johnson-controls-a421abg-02-temperature-control","title":"Johnson Controls A421ABG-02 Temperature Control","description":"\u003cp\u003eThe \u003cstrong\u003eJohnson Controls A421ABG-02\u003c\/strong\u003e is a professional-grade \u003cstrong\u003esingle-stage electronic temperature control\u003c\/strong\u003e designed for versatile HVACR applications. Operating on \u003cstrong\u003e120V AC\u003c\/strong\u003e, this unit features a factory-installed 6-foot power cord with a grounded male plug and a 6-foot cord with a female outlet, simplifying \"plug-and-play\" integration for refrigeration and heating equipment. As the \u003cstrong\u003edirect cross version of A419ABG-3\u003c\/strong\u003e, the A421 series represents the next generation of \u003cstrong\u003ePENN temperature controllers\u003c\/strong\u003e, offering enhanced digital precision and an intuitive \u003cstrong\u003ethree-button touchpad\u003c\/strong\u003e interface. The unit provides a broad \u003cstrong\u003econtrol range of -40 to 212?F\u003c\/strong\u003e (-40 to 100?C) and includes a high-accuracy \u003cstrong\u003eA99BB-200C temperature sensor\u003c\/strong\u003e with a 6.6-foot cable. The \u003cstrong\u003eSPDT output relay\u003c\/strong\u003e allows for seamless switching between heating and cooling modes, while the \u003cstrong\u003ebacklit LCD\u003c\/strong\u003e ensures clear visibility of setpoints and relay status in low-light mechanical rooms. Built into a \u003cstrong\u003eNEMA 1 high-impact plastic enclosure\u003c\/strong\u003e, it supports both surface and \u003cstrong\u003eDIN rail mounting\u003c\/strong\u003e, making it a reliable \u003cstrong\u003edigital thermostat replacement\u003c\/strong\u003e for technicians requiring fast setup and consistent performance.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits:\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect Cross Compatibility:\u003c\/strong\u003e Engineered as the primary replacement for the legacy \u003cstrong\u003eA419ABG-3\u003c\/strong\u003e series with improved digital logic.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Protection:\u003c\/strong\u003e Features an \u003cstrong\u003eadjustable anti-short cycle delay\u003c\/strong\u003e (0?12 minutes) to prevent compressor short-cycling and extend equipment life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdvanced Operational Control:\u003c\/strong\u003e Includes \u003cstrong\u003esensor offset\u003c\/strong\u003e for calibration and \u003cstrong\u003etemperature setback\u003c\/strong\u003e functionality via a binary input for energy-saving cycles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRugged Reliability:\u003c\/strong\u003e Housed in a durable \u003cstrong\u003eNEMA 1 enclosure\u003c\/strong\u003e designed to withstand standard mechanical room environments and \u003cstrong\u003esurface mount\u003c\/strong\u003e or \u003cstrong\u003eDIN rail\u003c\/strong\u003e configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions:\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I switch the A421ABG-02 between heating and cooling modes?\u003c\/strong\u003e\u003cbr\u003e\nThe mode is determined by the relationship between the \"On\" and \"Off\" setpoints. If the \"On\" temperature is higher than the \"Off\" temperature, the control operates in cooling mode. If the \"On\" temperature is lower than the \"Off\" temperature, it operates in heating mode.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan the temperature sensor cable be extended for remote monitoring?\u003c\/strong\u003e\u003cbr\u003e\nYes, the \u003cstrong\u003eA99 temperature sensor\u003c\/strong\u003e leads can be extended up to 250 feet using 22 AWG shielded cable, provided the connections are secure and the \u003cstrong\u003esensor offset\u003c\/strong\u003e parameter is adjusted to compensate for any added resistance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat happens if the sensor fails during operation?\u003c\/strong\u003e\u003cbr\u003e\nThe A421 series allows technicians to pre-set a \u003cstrong\u003eSensor Failure Mode\u003c\/strong\u003e, enabling the relay to remain in either a constant \"On\" or \"Off\" state to protect sensitive inventory or equipment until the sensor is replaced.\u003c\/p\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Johnson Controls","offers":[{"title":"Default Title","offer_id":35647927948,"sku":"A421ABG-02","price":154.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_dbd3ac26-7189-4f54-9543-c9ee1cb73714.png?v=1777920595","url":"https:\/\/www.gsistore.com\/products\/johnson-controls-a421abg-02-temperature-control","provider":"GSIstore","version":"1.0","type":"link"}