{"product_id":"armstrong-1-901-66-1-0-d33874-thermostat-assembly","title":"Armstrong 1 901.66.1.0 D33874 Thermostat Assembly","description":"\u003cdiv\u003e\u003cp\u003eArmstrong thermostat assembly, model 1 901.66.1.0 (D33874), is an Armstrong-branded control module identified as ASSY 566. It functions as the temperature‑control interface within Armstrong heating and cooling systems, translating user-setpoint input into control signals that initiate or stop heat, cooling, and fan operations through the system’s control circuitry. The dual part numbers—901.66.1.0 and D33874—facilitate precise replacement matching, while the ASSY 566 designation signals the specific assembly kit used during service and installation. Designed for use with Armstrong equipment, this thermostat assembly is intended for replacement in compatible Armstrong components to maintain proper system performance. Installation and replacement should follow standard HVAC procedures and Armstrong guidelines.\u003c\/p\u003e\u003c\/div\u003e","brand":"Armstrong","offers":[{"title":"New","offer_id":51660112068910,"sku":null,"price":709.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_32ed97cb-558c-400c-98d2-9710a0d0641e.jpg?v=1769533117","url":"https:\/\/plgautomation.com\/products\/armstrong-1-901-66-1-0-d33874-thermostat-assembly","provider":"PLG Automation ","version":"1.0","type":"link"}