{"product_id":"tempstar-40va-transformer-for-teb09k50rta-208-240v-to-24v-control-kit-ships-today","title":"Tempstar 40VA Transformer for TEB09K50RTA — 208\/240V to 24V Control Kit | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM control-power kit for the Tempstar TEB09K50RTA PTAC centers on a 40VA step-down transformer (part 1056899) that converts the unit's 208\/240V line voltage down to the 24V used by the control circuit, along with two 24V switching relays — a standard 24V relay (part 1053004) and a 24V DPST relay (part 1060940). The transformer powers the thermostat, relays, and control logic; if it fails open or shorts, the unit goes completely dead on the low-voltage side. The relays handle the actual switching of the fan and compressor loads. Symptoms of failure include a unit with line power but no control response, a tripped or buzzing transformer, or relays that no longer pull in. Replacing these components restores the full 24V control chain.\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 Numbers\u003c\/td\u003e\n\u003ctd\u003e1056899 (Transformer), 1053004 (Relay), 1060940 (DPST Relay)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eStep-Down Control Transformer + Relays\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\u003e40 VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e208\/240V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e24V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Poles\u003c\/td\u003e\n\u003ctd\u003e2 (DPST) \/ 24V coil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered for the Tempstar TEB09K50RTA PTAC and shared across ICP, Heil, and Comfortmaker PTAC units using the same 208\/240V-to-24V, 40VA control platform. Confirm your primary voltage tap and relay coil voltage 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 unit disconnect and verify zero voltage with a multimeter on both line and control sides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the PTAC front cover and control-box panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every primary and secondary lead and each relay terminal before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and disconnect the transformer leads and relay wiring, then unbolt the failed components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 40VA transformer and relays, matching the 208\/240V primary tap, and reconnect all leads per your photos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm 24V at the secondary with a meter, then verify the relays pull in and the unit cycles.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eLine power present but the unit is completely unresponsive\u003c\/li\u003e\n\u003cli\u003eNo 24V reading at the transformer secondary\u003c\/li\u003e\n\u003cli\u003eTransformer is buzzing, hot, scorched, or smells burnt\u003c\/li\u003e\n\u003cli\u003eRelays fail to click or chatter under load\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":63021644448115,"sku":"1053004-GEN","price":32.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048411283827,"sku":"1053004","price":42.84,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1053004_d98ca644-aec4-4a1e-a871-698a1ca0fec6.jpg?v=1782958553","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-40va-transformer-for-teb09k50rta-208-240v-to-24v-control-kit-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}