{"product_id":"tempstar-low-pressure-switch-assembly-for-t4h342gkd100-oem-1177594-ships-today","title":"Tempstar Low Pressure Switch Assembly for T4H342GKD100 — OEM 1177594 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM low pressure switch assembly (part #1177594) is a safety control on the Tempstar T4H342GKD100. It senses refrigerant suction pressure and opens the control circuit if pressure drops below the safe threshold — protecting the compressor from running on a low charge, a frozen coil, or a loss-of-refrigerant condition. When the switch fails or sticks open, the unit will lock out and refuse to start; when it sticks closed, the compressor loses its low-charge protection. Supplied as a complete assembly for a direct OEM replacement.\u003c\/p\u003e\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eLoss-of-charge \/ low-pressure compressor protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit\u003c\/td\u003e\n\u003ctd\u003e24V control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect-fit replacement for the Tempstar T4H342GKD100 and ICP-family systems (Heil, Comfortmaker, Arcoaire) that use this low-pressure safety assembly. Confirm the cut-out\/cut-in pressure rating and fitting type match your original before installing.\u003c\/p\u003e\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the electrical access panel and locate the switch on the suction line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wiring and switch location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads; if the switch threads onto a Schrader-style port it can be changed without recovering charge, otherwise recover refrigerant first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread on the new switch (don't over-tighten), reconnect the leads per your photo, and check for leaks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, call for cooling, and confirm the unit starts and the safety holds the circuit closed at normal pressure.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUnit locks out and won't start despite a proper charge.\u003c\/li\u003e\n\u003cli\u003eCompressor runs even when refrigerant is low (no protection).\u003c\/li\u003e\n\u003cli\u003eIntermittent nuisance trips on the low-pressure circuit.\u003c\/li\u003e\n\u003cli\u003eVisible damage or corrosion at the switch body or fitting.\u003c\/li\u003e\n\u003c\/ul\u003e\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":63021793706355,"sku":"1177594-GEN","price":34.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048463483251,"sku":"1177594","price":44.2,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_66fa774c-614a-4c77-8f35-f4c222635ffa.jpg?v=1782960506","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-assembly-for-t4h342gkd100-oem-1177594-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}