{"product_id":"icp-40va-transformer-for-rh5420482-208-240v-to-24v-ships-today","title":"ICP 40VA Transformer for RH5420482 — 208\/240V to 24V | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM control transformer (Part #1540372) supplies low-voltage power for ICP, Heil, and Tempstar systems, including model RH5420482. It steps 208\/240V line voltage down to 24V at 40VA to power the thermostat, contactor coil, relays, and control board. When a transformer fails — from an internal short, an overloaded secondary, or a control short circuit — the entire low-voltage control system goes dead: the thermostat is blank, the contactor won't pull in, and the system won't respond to a call for heating or cooling. A 40VA rating provides ample capacity for standard residential control circuits.\u003c\/p\u003e\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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1540372\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\u003eICP \/ Heil \/ Tempstar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Voltage\u003c\/td\u003e\n\u003ctd\u003e208\/240V\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\u003ePower Rating\u003c\/td\u003e\n\u003ctd\u003e40VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirectly fits ICP\/Heil\/Tempstar model RH5420482 and related ICP-family units that use a 208\/240V-to-24V, 40VA control transformer. Verify your existing primary tap configuration and mounting before installing.\u003c\/p\u003e\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the unit service\/control panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all primary and secondary leads before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the line-voltage primary and 24V secondary leads, then unmount the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, match the primary tap to your supply voltage, and reconnect leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V on the secondary and normal control operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBlank thermostat \/ no low-voltage power\u003c\/li\u003e\n\u003cli\u003eSystem completely unresponsive to heat or cool calls\u003c\/li\u003e\n\u003cli\u003eNo 24V reading at the secondary terminals\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visible scorching on the transformer\u003c\/li\u003e\n\u003c\/ul\u003e\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":"ICP","offers":[{"title":"Direct Replacement","offer_id":63027267109235,"sku":"1540372-GEN","price":27.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047951614323,"sku":"1540372","price":36.34,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1540372_db367e23-df26-4ddd-aa12-15e38b79fcd7.jpg?v=1782882425","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-transformer-for-rh5420482-208-240v-to-24v-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}