{"product_id":"stf-jc35fe-oil-differential-pressure-controller","title":"Shangheng STF JC3.5FE Oil Differential Pressure Control with 60-Second Delay","description":"\u003ch3\u003e\u003cspan\u003ePRODUCT DESCRIPTION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Shangheng STF JC3.5FE is a mechanical oil differential pressure control designed to protect refrigeration compressors equipped with forced-lubrication oil pumps.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt monitors the effective oil pressure difference between the oil-pump outlet and the compressor crankcase. If sufficient differential oil pressure is not established or remains below the set value for 60 seconds, the control initiates a protective shutdown to help prevent compressor damage caused by insufficient lubrication.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe control features an adjustable differential pressure range and manual reset. It is suitable for compatible commercial and industrial refrigeration compressors, condensing units and cold-storage systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eKEY FEATURES\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e• Mechanical oil differential pressure monitoring\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Adjustable differential pressure range from 0.5 to 3.5 bar\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Factory setting of approximately 1.0 bar\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Fixed 60-second safety delay\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Manual reset following a protective trip\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Maximum working pressure of 16 bar\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Compatible with AC 220 V and AC 380 V control circuits\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Designed for compressors with forced-lubrication oil pumps\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• High- and low-pressure connections for direct oil-pressure monitoring\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTECHNICAL SPECIFICATIONS\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan\u003eParameter\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eListed Model\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eJC3.5FE\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePublished Product Family\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eJC3.5\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eProduct Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMechanical Oil Differential Pressure Control\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eDifferential Pressure Adjustment Range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.5–3.5 bar\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFactory Set Point\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.0 bar \/ 0.1 MPa\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMaximum Working Pressure\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e16 bar\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSafety Delay Time\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e60 seconds\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRated Control Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAC 220 V \/ AC 380 V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eContact Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e300 VA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eReset Method\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eManual reset\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHigh-Pressure Connection\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLubricating oil-pump outlet\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eLow-Pressure Connection\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCompressor crankcase or low-pressure reference\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMain Application\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCompressor lubrication protection\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eShangheng \/ STF Controls\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eManufacturer\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eShanghai Thermostat Factory Co., Ltd.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cspan\u003eOPERATING PRINCIPLE\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe controller measures the difference between:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOil-pump outlet pressure − compressor crankcase pressure\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis value represents the effective lubricating oil pressure available to the compressor.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIf the pressure difference remains below the selected set point for 60 seconds after compressor start-up or during operation, the control activates the protective shutdown circuit. The cause of insufficient oil pressure must be identified and corrected before restarting the compressor.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eINSTALLATION NOTES\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e• Install the controller in a location with minimal vibration.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Connect the high-pressure port to the lubricating oil-pump outlet.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Connect the low-pressure port to the compressor crankcase or specified low-pressure reference.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Complete electrical wiring according to the terminal diagram and selected supply voltage.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Installation and commissioning must be performed by a qualified refrigeration technician.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• After a protective trip, investigate the lubrication fault before resetting the controller.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• According to the manufacturer’s instructions, wait at least five minutes before resetting after a system trip.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Confirm compatibility with the compressor, oil pump and control circuit before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eAPPLICATIONS\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e• Semi-hermetic refrigeration compressors with oil pumps\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Commercial refrigeration condensing units\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Industrial refrigeration systems\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Cold-storage refrigeration systems\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e• Chillers and other compatible compressor systems\u003c\/span\u003e\u003c\/p\u003e","brand":"Shangheng (STF Controls)","offers":[{"title":"JC3.5FE","offer_id":43922546065467,"sku":null,"price":22.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0683\/8920\/8123\/files\/2026-08-12_101754_908.png?v=1786501111","url":"https:\/\/xiaxuecoldroom.com\/products\/stf-jc35fe-oil-differential-pressure-controller","provider":"XIAXUE Refrigeration","version":"1.0","type":"link"}