{"product_id":"tempstar-low-pressure-switch-assembly-for-t4h448gkd100-oem-1177594-ships-today","title":"Tempstar Low Pressure Switch Assembly for T4H448GKD100 — OEM #1177594 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM low pressure switch assembly (part #1177594) is a refrigerant-side safety control on your Tempstar T4H448GKD100. It opens the 24V control circuit when suction pressure drops too low — protecting the compressor from running on a low charge, a blocked metering device, or a frozen coil. When the switch fails or the system loses charge, you'll see the unit short-cycle, lock out on a low-pressure fault, or refuse to start the compressor at all. A switch that's stuck open prevents any cooling\/heating call from energizing the compressor.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1177594\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eLow Pressure Switch Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (ICP\/Heil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump \/ Refrigerant Safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect OEM fit for the Tempstar T4H448GKD100 and other ICP-family (Heil, Comfortmaker, Tempstar) units originally equipped with low pressure switch #1177594. Confirm the connection fitting and cut-in\/cut-out pressures against your existing switch.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power and verify zero voltage with a multimeter; relieve any system pressure per EPA procedure if the fitting is open to refrigerant.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to reach the switch and its line connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the two control wires and the switch mounting\/fitting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the 24V leads and unthread the switch from the Schrader\/port fitting (most are self-sealing).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread on the new switch, snug the fitting, and reconnect the control leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm the compressor energizes and the unit holds without a low-pressure lockout.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCompressor won't start \/ unit locks out on low pressure\u003c\/li\u003e\n\u003cli\u003eSystem short-cycles repeatedly\u003c\/li\u003e\n\u003cli\u003eSwitch reads open with normal charge and pressures\u003c\/li\u003e\n\u003cli\u003eCorroded or damaged switch body or terminals\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\u003cp\u003eShips same day on orders placed before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021784203635,"sku":"1177594-GEN","price":39.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048464433523,"sku":"1177594","price":50.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_de48e5b0-6c86-4652-b13b-55ba0c100ff8.jpg?v=1782960521","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-assembly-for-t4h448gkd100-oem-1177594-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}