{"product_id":"tempstar-40va-transformer-for-teb09r34rta-277v-to-24v-ships-today","title":"Tempstar 40VA Transformer for TEB09R34RTA — 277V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM 40VA control transformer for the Tempstar TEB09R34RTA, factory part number 1091226. It steps the unit's 277V line voltage down to the 24VAC needed by the control circuit — the thermostat, relays, and contactors that run the system. This kit also covers the matching 24V control relays used in this model (parts 1053004 and 1060940 DPST). When the transformer fails — typically from an overload, a shorted control wire, or age — the entire low-voltage side goes dead: no thermostat response, no relay action, and no heating or cooling, even though line power is present.\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\u003eTransformer Part Number\u003c\/td\u003e\n\u003ctd\u003e1091226\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eControl Transformer\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\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e277 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRating\u003c\/td\u003e\n\u003ctd\u003e40 VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Relays\u003c\/td\u003e\n\u003ctd\u003e1053004 (24V), 1060940 (24V DPST)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Genuine\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 TEB09R34RTA. The 1091226 277V-to-24V 40VA transformer is used throughout the ICP-family TEB09R34 PTAC series (Tempstar, Heil, Comfortmaker) on 277V applications. Confirm your line voltage is 277V and check the transformer's printed ratings 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 unit and breaker; 277V is dangerous. 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 to reach the transformer and relays.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary (277V) and secondary (24V) wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads and unbolt the old transformer from its mounting bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 1091226 transformer, reconnect primary and secondary per your photo, and replace any failed relays.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24VAC on the secondary, then verify control operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNo 24V control power — thermostat and relays completely dead\u003c\/li\u003e\n\u003cli\u003eUnit will not start despite confirmed 277V line voltage\u003c\/li\u003e\n\u003cli\u003eBurned smell, scorched housing, or melted secondary leads\u003c\/li\u003e\n\u003cli\u003eRepeated control-fuse blow-outs or no 24VAC at the transformer secondary\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":63021644120435,"sku":"1053004-GEN","price":34.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048411382131,"sku":"1053004","price":45.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1053004_aa3ed6f5-f245-45ea-990b-1b8e2f197976.jpg?v=1782958558","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-teb09r34rta-277v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}