{"product_id":"icp-40va-control-transformer-24v-for-rhs181h0ca0aaaa-reversing-valve-relay-circuit-ships-today","title":"ICP 40VA Control Transformer 24V for RHS181H0CA0AAAA — Reversing Valve \u0026 Relay Circuit | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM \u003cstrong\u003e40VA 24V control transformer\u003c\/strong\u003e supplies the low-voltage control circuit for the ICP \/ Tempstar \/ Heil \u003cstrong\u003eRHS181H0CA0AAAA\u003c\/strong\u003e heat pump. The 24V secondary energizes the reversing valve coil (1172619), the DPDT changeover relay (1183814), and the DPST contactor relay (1178205) that direct the unit between heating and cooling. When the transformer fails, the entire low-voltage circuit goes dead — the thermostat loses power, the reversing valve won't shift, and the contactor won't pull in. A 40VA rating provides ample headroom for the combined coil and relay load on this chassis.\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\u003eRelated OEM Parts\u003c\/td\u003e\n\u003ctd\u003e1172619 (Rev. Valve Coil 24V), 1183814 (Relay DPDT), 1178205 (Relay 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\u003eICP \/ Tempstar \/ 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\u003eSecondary Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\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\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eFits the ICP-family RHS181H0CA0AAAA 1.5-ton heat pump and equivalent Tempstar, Heil, Comfortmaker, and Arcoaire units that share the same control assembly. Verify your primary voltage tap and secondary VA before installing.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power and verify zero voltage with a multimeter on both the line and 24V sides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to reach the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the primary and secondary wiring before disconnecting any leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the primary and 24V secondary leads, then unbolt the transformer from its bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new transformer, land the primary on the correct voltage tap, and reconnect the 24V secondary to the R and C terminals per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm 24V across the secondary and that the reversing valve and relays energize.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNo 24V at the thermostat or control board\u003c\/li\u003e\n\u003cli\u003eReversing valve won't shift between heat and cool\u003c\/li\u003e\n\u003cli\u003eContactor or relays won't pull in\u003c\/li\u003e\n\u003cli\u003eBurnt smell or visibly charred transformer housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\u003cp\u003eShips same day on orders placed before 3 PM CST. 30-day returns on unused parts. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"Direct Replacement","offer_id":63021844758899,"sku":"1172619-GEN","price":28.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63047950434675,"sku":"1172619","price":37.63,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-1172619_bfa40c58-8289-407e-b56d-c00bb0f1212f.jpg?v=1782882311","url":"https:\/\/nationalhvacparts.com\/products\/icp-40va-control-transformer-24v-for-rhs181h0ca0aaaa-reversing-valve-relay-circuit-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}