The Lennox 72F83 Sequencer Relay is a critical 24V normally open (NO) replacement component designed for heavy-duty HVAC staged electric heat applications

Specifically designed for manual reset (M/R) operation

Wide application range suitable for various non-corrosive refrigerants in commercial cooling systems

Compatible with high-performance Schneider Electric VB-7xxx series valve bodies for 1/2" to 2" pipe sizes

Nordyne 904803 Collector Box THPU32HP7Y The Lennox 72F83 Sequencer RelayWhen you're dealing with a cracked or leaking furnace secondary, the Nordyne 904803 Collector Box is the critical OEM replacement you need to restore proper drafting. As a furnace collector box and seal assembly, this part is engineered specifically to manage the transition of flue gases from the heat exchanger to the inducer motor. In high efficiency condensing gas furnaces, the 904803 collector box acts as the primary drainage and sealing point; a