{"product_id":"tempstar-low-pressure-switch-for-t4h548gkd200-oem-assembly-24v-ships-today","title":"Tempstar Low Pressure Switch for T4H548GKD200 — OEM Assembly 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM low pressure switch assembly (part #1177594) is a refrigerant-side safety control on your Tempstar T4H548GKD200. Wired into the 24V control circuit, it opens when suction-side refrigerant pressure drops below a safe threshold — protecting the compressor from running on a low or lost charge, a blocked line, or a frozen coil. When the switch trips or fails, the compressor will be locked out or short-cycle, and the system won't cool or heat properly.\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 Compressor Protection\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 fit for the Tempstar T4H548GKD200 heat pump. Also used across ICP-family (Heil, Comfortmaker, Tempstar) condensing units and heat pumps that specify low pressure switch assembly #1177594. Match the part number and connection type on your existing switch before ordering.\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 disconnect and breaker, then verify zero voltage with a multimeter. Note this part is on the sealed refrigerant circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's service panel to reach the switch and its leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wiring and mounting location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the 24V leads; if the switch threads onto a Schrader-style port it can be swapped without recovery, otherwise recover refrigerant first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new switch assembly and reconnect the control leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm the switch is closed at normal pressure, and verify the compressor runs and the safety functions.\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 or is locked out on a low-pressure fault.\u003c\/li\u003e\n\u003cli\u003eSystem short-cycles even with a verified good refrigerant charge.\u003c\/li\u003e\n\u003cli\u003eSwitch fails a continuity test at normal operating pressure.\u003c\/li\u003e\n\u003cli\u003eNuisance trips that clear when the switch is jumpered.\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":63021782073715,"sku":"1177594-GEN","price":34.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048465580403,"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_157cd7ea-f484-4ede-a010-43add6215067.jpg?v=1782960557","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-for-t4h548gkd200-oem-assembly-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}