{"product_id":"tempstar-low-pressure-switch-assembly-for-t4h460gkd100-oem-1177594-ships-today","title":"Tempstar Low Pressure Switch Assembly for T4H460GKD100 — OEM 1177594 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM low pressure switch assembly (part number 1177594) is the refrigerant-side safety control for the Tempstar T4H460GKD100. Wired into the 24V control circuit, the low pressure switch continuously monitors suction-line pressure and opens to shut the compressor down if pressure drops too low — protecting the compressor from running on a low charge, a restriction, or a frozen coil. When this switch fails or goes out of calibration, you may see the compressor refuse to start, nuisance trips and lockouts, intermittent cooling\/heating, or a unit that short-cycles. Restoring a properly functioning low pressure switch keeps the system's safety chain intact and prevents expensive compressor damage from running under low-charge conditions.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\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)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit\u003c\/td\u003e\n\u003ctd\u003e24V Control \/ Safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eSuction-Line Refrigerant Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Exact-Fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect OEM replacement for the Tempstar T4H460GKD100 and related ICP\/Heil\/Tempstar\/Comfortmaker units specifying low pressure switch 1177594. Verify the part number, fitting type, and pressure rating against the original before installing.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to reach the refrigerant lines and control wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the switch leads and mounting location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the 24V leads; if the switch is on a Schrader\/access fitting, unthread it (recover refrigerant first if the connection is brazed or open).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread on the new switch with a fresh gasket\/seal, reconnect the control leads per your photo, and check for leaks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm the compressor energizes on a call with the safety circuit closed and no nuisance trips.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompressor won't start and the control circuit reads open\u003c\/li\u003e\n\u003cli\u003eNuisance lockouts or repeated safety trips\u003c\/li\u003e\n\u003cli\u003eShort-cycling or intermittent cooling\/heating\u003c\/li\u003e\n\u003cli\u003eSwitch fails to reset after pressure normalizes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003eShips same day 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":63021783515507,"sku":"1177594-GEN","price":42.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048464466291,"sku":"1177594","price":54.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_dca6e9b7-b93f-4e82-b984-8db13b83fc64.jpg?v=1782960524","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-assembly-for-t4h460gkd100-oem-1177594-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}