{"product_id":"tempstar-low-pressure-switch-for-t4h336gke100-24v-assembly-ships-today","title":"Tempstar Low Pressure Switch for T4H336GKE100 — 24V Assembly | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM low pressure switch assembly (Part No. 1177594) is the loss-of-charge and freeze-protection safety on the Tempstar T4H336GKE100. Wired into the 24V control circuit, it monitors suction-side refrigerant pressure and opens to shut the compressor down if pressure drops too low — a condition caused by a refrigerant leak, low charge, a restricted metering device, or low airflow. By interrupting the compressor call, the switch prevents the compressor from running in a vacuum and being damaged by overheating or liquid migration. A failed switch may trip with a fully charged system, stick open so the compressor never starts, or stick closed and fail to protect the compressor at all.\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\u003e24 VAC Circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eLoss-of-Charge \/ Compressor Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned for the Tempstar T4H336GKE100 heat pump and matching ICP \/ Heil \/ Comfortmaker condensers that use low pressure switch 1177594. Confirm the part number and connection style (Schrader\/quick-connect vs. brazed) against your original 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.\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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the two control wires and the switch location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads; for Schrader-mounted switches simply unthread the switch (the valve core seals the system). For brazed connections, recover refrigerant first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread on the new switch with a new gasket\/seal, then reconnect the control leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, call for cooling, and verify the compressor runs and the switch holds closed at normal operating pressure.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompressor will not start even with a confirmed full charge.\u003c\/li\u003e\n\u003cli\u003eNuisance low-pressure lockouts that clear and return.\u003c\/li\u003e\n\u003cli\u003eSwitch fails a continuity test against measured suction pressure.\u003c\/li\u003e\n\u003cli\u003eCorroded, cracked, or leaking switch body or fitting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003eShips same day on orders placed 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":63021794066803,"sku":"1177594-GEN","price":34.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048465121651,"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_f83b34a7-5a6f-47c0-94b5-708cf81a30c4.jpg?v=1782960544","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-for-t4h336gke100-24v-assembly-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}