{"product_id":"tempstar-low-pressure-switch-assembly-for-t4h736gkd100-24v-ships-today","title":"Tempstar Low Pressure Switch Assembly for T4H736GKD100 — 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM low pressure switch assembly (part 1177594) is a safety control on the Tempstar T4H736GKD100. It monitors refrigerant suction pressure and opens the 24V control circuit if pressure drops too low — protecting the compressor from running on a low charge, a frozen coil, or a restriction. A failed or stuck switch will either nuisance-trip and prevent the compressor from starting, or fail to protect the system at all.\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\/Heil family)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit\u003c\/td\u003e\n\u003ctd\u003e24V control \/ auto-reset\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eRefrigerant Low-Pressure Safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect OEM replacement for the Tempstar T4H736GKD100 and equivalent ICP\/Heil\/Comfortmaker family units originally equipped with switch 1177594.\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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser\/heat-pump service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the switch leads and refrigerant port location.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the 24V leads; if the switch threads onto a Schrader port, unthread it (minimal refrigerant loss). Brazed-in ports require refrigerant recovery first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Install the new switch onto the port (replace the seal\/O-ring), reconnect the 24V leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm the compressor starts on a call, and verify the switch reads closed at normal operating pressure.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCompressor won't start (switch stuck open \/ nuisance trip)\u003c\/li\u003e\n\u003cli\u003eIntermittent short-cycling on low-pressure lockout\u003c\/li\u003e\n\u003cli\u003eSwitch fails to open on an actual low-charge condition\u003c\/li\u003e\n\u003cli\u003eNo continuity change across the switch as pressure changes\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":63021781188979,"sku":"1177594-GEN","price":36.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048464826739,"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_7c2913ff-f616-47c4-a41f-84eb6c1c9531.jpg?v=1782960537","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-assembly-for-t4h736gkd100-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}