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The RCD lh33wp003 is a direct spark ignition control board designed as an OEM-style replacement for commercial rooftop HVAC equipment. This board manages the ignition sequence and continuously monitors safety sensors throughout system operation. When an unsafe condition is detected, the board initiates a controlled shutdown to protect equipment and occupants. Measuring 7.9 inches long by 6.3 inches wide by 3.05 inches tall and weighing under 1 pound, the lh33wp003 is a compact, drop-in replacement suited for qualified HVAC technicians performing control board service on compatible packaged rooftop units.
This control board is used in commercial packaged rooftop HVAC systems where direct spark ignition is the specified ignition method. Compatible units include the 48TME008 500, 48TFE006 510, and 48TCEA06 5A, among others as noted by the original supplier documentation. Typical applications involve light commercial rooftop installations where reliable ignition control and safety monitoring are required for consistent system performance.
Compatible units include the 48TME008 500, 48TFE006 510, and 48TCEA06 5A. Refer to the original equipment documentation for the complete list of fits-models as provided by the supplier.
Installation of a direct spark ignition control board should be performed by a licensed HVAC technician. Disconnect all electrical power to the unit at the disconnect switch before removing the existing board or handling any wiring. Follow all applicable local mechanical and electrical codes during service. Do not restore power or attempt ignition until all wiring connections have been verified secure and the access panels are properly closed.
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