{"product_id":"tempstar-control-transformer-for-teb07r25rta-277v-to-24v-40va-ships-today","title":"Tempstar Control Transformer for TEB07R25RTA — 277V to 24V 40VA | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is the OEM low-voltage control transformer for the Tempstar TEB07R25RTA packaged terminal unit. It steps the 277V line-voltage supply down to the 24V control voltage that powers the unit's relays, thermostat circuit, and contactor coil. The assembly group also covers the companion control relays (P\/N 1053004, 24V; P\/N 1060940, 24V DPST) used in this model's control sequence. Rated at 40VA, the transformer delivers stable, isolated 24V power to the entire control board and switching circuit. When a transformer fails — usually from a shorted secondary, an overloaded control circuit, or age-related insulation breakdown — the unit goes completely dead on the control side: no fan, no compressor call, and no thermostat response even though line voltage is present. A buzzing transformer, a tripped low-voltage fuse, or 0V on the secondary terminals are the classic failure signatures.\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\u003ePrimary Part Number\u003c\/td\u003e\n\u003ctd\u003e1091226 (TRANS 277\u0026gt;24 40VA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompanion Parts\u003c\/td\u003e\n\u003ctd\u003e1053004 (Relay 24V), 1060940 (Relay 24V DPST)\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\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\u003ctr\u003e\n\u003ctd\u003eRating\u003c\/td\u003e\n\u003ctd\u003e40VA\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\u003eEngineered for the Tempstar TEB07R25RTA and shared across the ICP\/Tempstar\/Heil family of 277V PTAC packaged terminal units that use a 40VA control transformer. Always confirm your unit's primary voltage is 277V before installing — 208\/230V models use a different transformer.\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 breaker and verify zero voltage with a multimeter at both the line and control terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the unit's service panel to expose the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary and secondary wiring before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and disconnect the 277V primary leads and 24V secondary leads, then unbolt the failed transformer from the chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, reconnect primary to 277V and secondary to the 24V control bus exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify 24V across the secondary and a normal control sequence on a thermostat call.\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 at the secondary terminals while 277V is present on the primary.\u003c\/li\u003e\n\u003cli\u003eRepeatedly blown low-voltage fuse or no control response at the thermostat.\u003c\/li\u003e\n\u003cli\u003eAudible buzzing, overheating, or a scorched\/melted transformer housing.\u003c\/li\u003e\n\u003cli\u003eIntermittent control operation that worsens as the transformer heats up.\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":63021645005171,"sku":"1053004-GEN","price":34.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048438120819,"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_c4c7ebfc-d993-4af2-9772-ec8fbc5da711.jpg?v=1782959600","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-control-transformer-for-teb07r25rta-277v-to-24v-40va-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}