{"product_id":"75va-120-208-240v-to-24v-transformer-universal-hvac-replacement-1","title":"75VA 120\/208\/240V to 24V Transformer — Universal HVAC Replacement","description":"\u003cp\u003e75VA control transformer stepping down from 120\/208\/240V to 24V AC. Universal replacement for large commercial systems and replacements. The transformer provides the low-voltage 24V power that runs your thermostat, control board, gas valve, and contactor coil — without it, your entire HVAC control circuit is dead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen to replace:\u003c\/strong\u003e No power to thermostat (blank screen), system completely unresponsive, burning smell from furnace, tripped breaker when system runs, buzzing from transformer with no 24V output, or measured secondary voltage below 22V.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVA Rating:\u003c\/strong\u003e 75VA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary (Input):\u003c\/strong\u003e 120\/208\/240V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary (Output):\u003c\/strong\u003e 24V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Class 2 Control Transformer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e large commercial systems and replacements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Foot mount with screw terminals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year replacement warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Turn off all power at breaker. Disconnect wires from old transformer (photograph first). Remove mounting screws. Mount new transformer, reconnect wires to matching terminals (primary to line voltage, secondary to 24V circuit). 15-25 minutes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSizing guide:\u003c\/strong\u003e A 75VA transformer handles heavy commercial loads, multi-zone systems, and setups with multiple 24V accessories drawing significant current.\u003c\/p\u003e","brand":"National HVAC Parts","offers":[{"title":"Default Title","offer_id":63009906360691,"sku":"NHVAC-XFMR-75VA-120","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/51xUbKfPC7L._SL500.jpg?v=1782104815","url":"https:\/\/nationalhvacparts.com\/products\/75va-120-208-240v-to-24v-transformer-universal-hvac-replacement-1","provider":"National HVAC Parts","version":"1.0","type":"link"}