{"product_id":"tempstar-40va-transformer-for-thb09r34rta-277v-to-24v-w-24v-relays-ships-today","title":"Tempstar 40VA Transformer for THB09R34RTA — 277V to 24V w\/ 24V Relays | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM 40VA control transformer steps 277V line voltage down to 24V to power the low-voltage control circuit on the Tempstar THB09R34RTA PTAC. The control package also includes the 24V relays (OEM 1053004 SPST and 1060940 DPST) that switch the unit's components on the transformer's 24V output. When a transformer fails open or shorts, the unit loses all 24V control power — the thermostat goes dead, relays will not pull in, and the system will not start. Replacing it with the correct 277V\/40VA OEM transformer restores low-voltage control.\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\u003e1091226 (Transformer), 1053004 \/ 1060940 (Relays)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eStep-Down Control Transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (ICP \/ Heil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRating\u003c\/td\u003e\n\u003ctd\u003e40VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e277V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary 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\u003eBuilt for the Tempstar THB09R34RTA PTAC chassis and shared ICP \/ Heil 277V PTAC platforms using the same control package. Verify your primary voltage (277V) and VA rating before ordering.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the PTAC plug\/breaker and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the front grille and control panel cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary and secondary wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unfasten the failed transformer and disconnect its leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, matching 277V primary and 24V secondary leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V at the secondary and proper relay operation.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNo 24V control power; thermostat is completely dead\u003c\/li\u003e\n\u003cli\u003eRelays will not energize\u003c\/li\u003e\n\u003cli\u003eBurned, melted, or buzzing transformer\u003c\/li\u003e\n\u003cli\u003eRepeated control-fuse failures\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":63021638156659,"sku":"1053004-GEN","price":38.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048412791155,"sku":"1053004","price":49.4,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1053004_b3127ce3-0e23-414f-a857-1ad61c5bb7bc.jpg?v=1782958602","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-thb09r34rta-277v-to-24v-w-24v-relays-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}