{"product_id":"bard-hvac-8406-135bx-pressure-switch","title":"Bard HVAC 8406-135BX Pressure Switch","description":"\u003cp\u003eAs a seasoned technician, you know that protecting the compressor is your top priority when servicing high-performance equipment. The \u003cspan\u003e\u003cstrong\u003eBard HVAC\u003c\/strong\u003e \u003c\/span\u003e\u003cstrong\u003e8406-135BX Pressure Switch\u003c\/strong\u003e is the definitive OEM safety control designed to monitor the suction side of the refrigeration circuit. Factory-calibrated to \u003cstrong\u003ecut out at 14 PSIG\u003c\/strong\u003e, this \u003cstrong\u003elow pressure switch\u003c\/strong\u003e acts as a critical line of defense against catastrophic failure. By instantly interrupting operation when refrigerant levels drop or airflow becomes restricted, it prevents the compressor from running in a starved state, which can lead to overheating and internal mechanical seizure.\u003c\/p\u003e\n\u003cp\u003eThis \u003cstrong\u003egenuine Bard replacement part\u003c\/strong\u003e features a rugged \"BX\" boxed design for secure transit and matches the exacting specifications of the original 8406-135 component. Its \u003cstrong\u003escrew-on mount\u003c\/strong\u003e allows for a precise fit on compatible \u003cspan\u003e\u003cstrong\u003eBard HVAC \u003c\/strong\u003e\u003c\/span\u003e\u003cstrong\u003ewall-mount air conditioners\u003c\/strong\u003e and heat pumps, ensuring a reliable leak-free seal. Whether you are troubleshooting a \u003cstrong\u003eshort cycling HVAC system\u003c\/strong\u003e or performing a preventative maintenance overhaul, installing this \u003cstrong\u003e14 PSIG limit switch\u003c\/strong\u003e restores the factory-engineered safety interlock, maintaining system stability and operational longevity in demanding commercial and industrial environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Benefits for Contractors:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise 14 PSIG Setpoint:\u003c\/strong\u003e Provides accurate low-pressure monitoring to trigger system shutdown before domestic or commercial compressor damage occurs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Compatibility:\u003c\/strong\u003e Designed specifically for use in Bard W30HB, W36HB, W42HC, and W48HC series wall-mount units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Circuit Protection:\u003c\/strong\u003e Prevents nuisance operation during loss of charge, evaporator icing, or severe filter restrictions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built to withstand the high-vibration environment of industrial HVAC cabinets for long-term reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Questions \u0026amp; Troubleshooting:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat are the symptoms of a failing pressure switch?\u003c\/strong\u003e Look for intermittent cooling, strange clicking noises from the contactor, or a \"locked out\" system with a low-pressure fault code.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes the 'BX' suffix affect performance?\u003c\/strong\u003e No. The 'BX' simply indicates the part is individually boxed for shipping; it is physically and technically identical to the 8406-135.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow do I verify if the switch is open?\u003c\/strong\u003e Use a multimeter to check for continuity across the terminals when the system is at resting pressure; if the circuit is open at normal static levels, the switch has likely failed or drifted out of calibration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\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":"Bard HVAC","offers":[{"title":"Default Title","offer_id":42885528354994,"sku":"8406-135BX","price":32.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_8603d836-ff7f-4c4a-a6ab-4f8827688f55.png?v=1780518990","url":"https:\/\/www.gsistore.com\/products\/bard-hvac-8406-135bx-pressure-switch","provider":"GSIstore","version":"1.0","type":"link"}