{"product_id":"johnson-controls-a421gbf-02c-temperature-controller-24v","title":"Johnson Controls a421gbf-02c Temperature Controller 24V","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Johnson Controls a421gbf-02c is a single-stage electronic temperature controller designed for precise temperature management across a wide range of HVAC, refrigeration, and process control applications. Operating on 24 volts, it covers a sensing range of -10 to 212 degrees F, making it suitable for both low-temperature refrigeration and high-temperature process monitoring. The integrated display allows technicians to read setpoints and current sensor temperature at a glance without additional instruments. This controller is installed by licensed HVAC technicians and refrigeration mechanics working on commercial and light commercial systems.\u003c\/p\u003e\u003cp\u003eThe a421gbf-02c is well suited for commercial refrigeration cases, walk-in coolers, HVAC unit control, and process equipment where a dependable single-stage output with local display readout is required. Its 24-volt operating voltage fits naturally into low-voltage control circuits common in commercial refrigeration and HVAC systems. The wide sensing range makes it adaptable across cooling and heating applications without requiring separate controllers for different temperature zones.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eWide sensing range of -10 to 212 degrees F covers refrigeration and process heating applications\u003c\/li\u003e\n\u003cli\u003e24-volt operating voltage integrates directly into standard low-voltage control circuits\u003c\/li\u003e\n\u003cli\u003eIntegrated display provides local readout of setpoint and measured temperature\u003c\/li\u003e\n\u003cli\u003eSingle-stage output simplifies wiring and control logic for straightforward on-off control\u003c\/li\u003e\n\u003cli\u003eCompact controller form factor suitable for panel or surface mounting in commercial equipment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style single-stage temperature controller for use in commercial HVAC, refrigeration, and light process control applications requiring a 24-volt control circuit and a -10 to 212 degrees F sensing range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified HVAC or refrigeration technician familiar with low-voltage control wiring practices. De-energize the control circuit completely before removing or connecting any wiring. Sensor placement is critical to accurate control — follow the equipment manufacturer's sensor location guidelines. Wiring should conform to NEC requirements for low-voltage Class 2 control circuits.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e: 24 volts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Sensing Range\u003c\/strong\u003e: -10 to 212 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay\u003c\/strong\u003e: Integrated\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: Johnson Controls\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: a421gbf-02c\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JOHNSON CONTROLS","offers":[{"title":"Default Title","offer_id":51268036034866,"sku":"A421GBF-02C","price":208.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/A421GBF02C.jpg?v=1780697540","url":"https:\/\/voomisupply.com\/products\/johnson-controls-a421gbf-02c-temperature-controller-24v","provider":"Voomi Supply","version":"1.0","type":"link"}