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It features a critical 15-second pre-purge (15sPP) to clear the combustion chamber and a 4-second Trial-For-Ignition (TFI) window
provided there is sufficient clearance for the 1/4 turn handle
Durable Infrastructure: Designed to handle the thermal demands of the burner compartment with a 120V primary input and 24V secondary output
eliminating the need for mounting bracket modifications or wiring harnesses often required with universal ECMs
this board integrates seamlessly with a dedicated thermistor probe to ensure tight modulation and system stability
Carrier 48GS660004 Heat Exchanger Kit 321894-708 It features a critical 15-secondThe Carrier 48GS660004 Heat Exchanger Kit is an essential OEM solution for maintaining the structural integrity and thermal performance of Carrier 48GS series single packaged rooftop units. Designed as a direct primary heat exchanger replacement, this kit features a robust 6 tube configuration engineered to withstand the rigorous thermal cycling common in light commercial and residential gas heating applications. Utilizing factory authorized parts