the D673 inducer motor is a common cross-reference for part numbers 51-21504-01 and JA1M139

checking the unit’s service manual for specific setup requirements is recommended

if the wiring is intact and the ambient temperature is within the -30°F to 220°F range

making it compatible with high-pressure synthetic refrigerants

Built to withstand the thermal stresses of continuous duty cycles

Laars Heating Systems 2400-451 Valve Kit 323269-701 the D673 inducer motor isThe Laars Heating Systems 2400 451 Valve Kit is a critical OEM component designed specifically for boiler condensation prevention. As a veteran technician, you know that maintaining proper return water temperatures is essential to protecting the heat exchanger from the corrosive effects of flue gas condensation. This anti condensing valve kit acts as a thermal bypass, ensuring the Laars Pennant boiler or Endurance series unit reaches a safe operating