{"product_id":"tempstar-low-pressure-switch-for-t4h330gke100-24v-refrigerant-safety-ships-today","title":"Tempstar Low Pressure Switch for T4H330GKE100 — 24V Refrigerant Safety | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM low pressure switch assembly (part number 1177594) protects the Tempstar T4H330GKE100 heat pump from operating under loss-of-charge or low-suction-pressure conditions. Wired into the 24V control circuit, the switch opens when refrigerant pressure falls below its setpoint, shutting the compressor down before damage occurs from running low on charge. A failed or stuck switch can cause nuisance lockouts, a compressor that will not start, or — if shorted — loss of critical safety protection. Typical symptoms include a unit that short cycles, fails to start in cold weather, or repeatedly trips its control board fault.\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\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eLoss-of-charge \/ low suction protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for the Tempstar T4H330GKE100 heat pump condensing unit. This is the factory-specified low pressure safety control for this model. Verify the connection style (quick-connect vs. flare) and electrical terminals against your existing switch 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 and verify zero voltage with a multimeter. Confirm system pressures are safe before opening the refrigerant circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control\/service panel to expose the switch and its wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads and remove the old switch from its port (recover refrigerant first if the port is not Schrader-type).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new switch, reconnect the 24V leads per your photo, and ensure the connection is leak-tight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify the unit starts and runs without nuisance pressure 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 will not start or locks out on a pressure fault\u003c\/li\u003e\n\u003cli\u003eSystem short cycles or fails to run in low ambient conditions\u003c\/li\u003e\n\u003cli\u003eSwitch reads open with normal system pressure\u003c\/li\u003e\n\u003cli\u003eVisible corrosion, damage, or a refrigerant leak at the switch port\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":63021795410291,"sku":"1177594-GEN","price":36.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048464925043,"sku":"1177594","price":48.04,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_15ca46f7-4558-45b7-99e2-34e353000151.jpg?v=1782960541","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-for-t4h330gke100-24v-refrigerant-safety-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}