Modular Bus Connection: Sliding edge-connectors reduce installation time and cabling complexity for multi-unit banks

Simplified Maintenance: Direct replacement design reduces labor time during damper actuator overhauls

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

or a "Flame Failure" where the valve fails to open despite receiving the proper 24V signal

Durable Polymer Construction: Engineered to withstand high-humidity environments without corrosion or moisture absorption

Laars Heating Systems 2400-451 Valve Kit 323269-701 Modular Bus Connection: Sliding edge-connectorsThe 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