{"product_id":"tempstar-low-pressure-switch-for-tch648gka100-refrigerant-safety-ships-today","title":"Tempstar Low Pressure Switch for TCH648GKA100 — Refrigerant Safety | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM low pressure switch (part number 1184655) is a refrigerant safety control that protects the compressor in your Tempstar TCH648GKA100. Wired into the 24V control circuit, it opens when suction-side refrigerant pressure drops below a safe threshold — typically from a loss-of-charge leak, a blocked metering device, or extreme low-ambient operation — and interrupts the call to the contactor so the compressor cannot run dry. When this switch fails or stays open, the outdoor unit short-cycles or refuses to start, even though the thermostat is calling for cooling. A switch stuck closed defeats the safety entirely and exposes the compressor to damage.\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\u003e1184655\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eLow Pressure Switch (Loss-of-Charge Safety)\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\u003eCircuit\u003c\/td\u003e\n\u003ctd\u003e24V Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eOpens on low suction pressure\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\u003eDirect OEM replacement for the Tempstar TCH648GKA100 condensing unit. This low pressure switch is shared across ICP-family outdoor units (Heil, Comfortmaker, Arcoaire) using the same refrigerant safety platform. Confirm the part number and the connection type (Schrader port vs. brazed) 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 at the outdoor disconnect and breaker, then verify zero voltage with a multimeter on the control wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to expose the pressure switch on the suction line and its low-voltage leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the two control wires and the switch's mounting\/port location.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the 24V leads. For a Schrader-port switch, unscrew it (the port self-seals); for a brazed switch, recover refrigerant before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread or braze in the new switch, reconnect the 24V leads per your photo, and confirm the port seats fully.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, verify the switch is closed at normal charge, and confirm the unit starts and runs on a cooling call.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutdoor unit won't start despite a cooling call and good charge\u003c\/li\u003e\n\u003cli\u003eCompressor short-cycles on the low-pressure safety\u003c\/li\u003e\n\u003cli\u003eSwitch fails to open during an actual loss-of-charge event\u003c\/li\u003e\n\u003cli\u003eContinuity test shows the switch stuck open or stuck closed\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":63021652050291,"sku":"1184655-GEN","price":34.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048465973619,"sku":"1184655","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-1184655_5ab7cb29-0013-450d-a5e9-dcbb8a757f21.jpg?v=1782960573","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-for-tch648gka100-refrigerant-safety-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}