{"product_id":"tempstar-low-pressure-switch-for-t4h419gkd100-refrigerant-safety-ships-today","title":"Tempstar Low Pressure Switch for T4H419GKD100 — Refrigerant Safety | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM low pressure switch assembly (part 1177594) is a refrigerant safety control for the Tempstar T4H419GKD100. It monitors suction-side pressure and opens the control circuit if pressure drops below a safe threshold — protecting the compressor from running on a low charge, a blocked metering device, or loss of refrigerant. When it trips, the unit locks out the compressor to prevent damage. A failed or stuck switch causes nuisance lockouts or, worse, allows the compressor to run unprotected.\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)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eSuction-Side Safety Cutout\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\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eMade for the Tempstar T4H419GKD100 and matching ICP\/Heil\/Comfortmaker systems using this low pressure cutout. Verify the part number and trip\/reset pressure settings against your original 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. Confirm the system charge before condemning the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser service panel to reach the switch on the suction line\/port.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wiring and switch port location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads; if it threads onto a Schrader port, unthread it (minimal refrigerant loss); if brazed, recover refrigerant first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread or braze the new switch onto the port, reconnect the leads per your photo, and evacuate\/recharge if the system was opened.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm the unit runs without nuisance low-pressure lockouts.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCompressor locks out on low pressure with a verified-good charge\u003c\/li\u003e\n\u003cli\u003eSwitch won't close even at normal operating pressure\u003c\/li\u003e\n\u003cli\u003eIntermittent or nuisance safety trips\u003c\/li\u003e\n\u003cli\u003eFailed continuity test across its proper pressure range\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\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":63021788168563,"sku":"1177594-GEN","price":34.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048465351027,"sku":"1177594","price":45.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_30419a19-e1df-43ad-af64-912c3f3d8ae1.jpg?v=1782960553","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-for-t4h419gkd100-refrigerant-safety-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}