{"product_id":"tjernlund-products-950-0029","title":"Tjernlund Products 950-0029 Pressure Switch","description":"\u003cp\u003eAs a veteran HVACR technician, you know that keeping a side-wall venter system online depends on precise airflow verification. The \u003cstrong\u003eTjernlund 950-0029 Pressure Switch\u003c\/strong\u003e is the mandatory \u003cstrong\u003efan proving switch\u003c\/strong\u003e designed specifically for \u003cstrong\u003eTjernlund SS2\u003c\/strong\u003e venter systems. Featuring a non-adjustable set point factory-calibrated at -.40” W.C. on pressure drop, this \u003cstrong\u003ereplacement air pressure switch\u003c\/strong\u003e ensures the burner only fires when the draft inducer has established safe venting conditions. This \"new style\" plastic-bodied component facilitates more efficient field service with its \u003cstrong\u003einternal junction box mount\u003c\/strong\u003e, which simplifies terminal access and protects high-voltage connections from environmental wear.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eTjernlund SS2 service kit\u003c\/strong\u003e includes this switch to maintain the critical safety interlock between the motor and the gas or oil burner. Its compact 4x4x4-inch footprint allows for seamless \u003cstrong\u003eHVAC ventilation repair\u003c\/strong\u003e in tight residential or light commercial footprints where wall-mount clearance is limited. When diagnosing \"no-heat\" calls on \u003cstrong\u003eSS2 Draft Inducers\u003c\/strong\u003e, swapping in this \u003cstrong\u003egenuine OEM Tjernlund part\u003c\/strong\u003e eliminates the calibration drift often found in generic \"universal\" alternatives. This switch is engineered for 115V applications and is essential for verifying the performance of your ventilation sequence.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits for Technicians\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFactory Calibrated Precision:\u003c\/strong\u003e Fixed set point of -.40” W.C. ensures \u003cstrong\u003esafe furnace operation\u003c\/strong\u003e without the risk of field adjustment errors.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal J-Box Design:\u003c\/strong\u003e The integrated \u003cstrong\u003ejunction box mount\u003c\/strong\u003e provides a cleaner wiring interface and increased protection for electrical terminals.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSS2 Application-Specific:\u003c\/strong\u003e Engineered specifically as a \u003cstrong\u003edraft inducer proving switch\u003c\/strong\u003e for the SS2 series, ensuring 100% mechanical and electrical compatibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Infrastructure:\u003c\/strong\u003e Built with high-grade plastic housing to resist the temperature fluctuations found near venter housings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Troubleshooting \u0026amp; FAQs\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the signs of a failing Tjernlund 950-0029?\u003c\/strong\u003e\u003cbr\u003e\nMost calls involve the burner failing to ignite despite the inducer motor running. If your manometer shows at least -.40” W.C. but the \u003cstrong\u003eSS2 pressure switch contacts\u003c\/strong\u003e aren’t closing, the diaphragm has likely failed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use an adjustable pressure switch to replace the 950-0029?\u003c\/strong\u003e\u003cbr\u003e\nNo. Using an adjustable switch in place of this OEM \u003cstrong\u003eTjernlund SS2 replacement part\u003c\/strong\u003e is unsafe. The fixed set point is critical for the specific static pressure requirements of the SS2 venter housing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow do I install the internal junction box version?\u003c\/strong\u003e\u003cbr\u003e\nThe 950-0029 is a \u003cstrong\u003efast HVAC service\u003c\/strong\u003e component that mounts directly inside the inducer’s electrical compartment, utilizing existing screw patterns for a drop-in replacement.\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":"Tjernlund Products","offers":[{"title":"Default Title","offer_id":43465311748274,"sku":"950-0029","price":149.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_36917ba2-2f75-47f8-b5dd-776588822b40.png?v=1701806549","url":"https:\/\/www.gsistore.com\/en-ca\/products\/tjernlund-products-950-0029","provider":"GSIstore","version":"1.0","type":"link"}