The Carrier HD52DL857 Motor is a high-performance 1 HP blower motor designed for heavy-duty HVACR applications requiring a 3450 RPM synchronous speed

Port B is typically the normally closed port when the motor is de-energized

commercial building HVAC systems

atmospheric boilers

High-Durability Construction: Cast bronze body with brass trim and EPDM packing rated for fluid temperatures up to 284°F

Lochinvar & A.O. Smith 100109721 Upper Probe 320735-701 The Carrier HD52DL857 Motor isThe Lochinvar & A. O. Smith 100109721 Upper Probe is a critical OEM replacement part engineered for the inner control assembly of high efficiency commercial water heaters. As a high performance hot surface igniter, this 100109721 probe is essential for ensuring reliable ignition cycles and precise flame sensing in BTH Series units. Designed to meet exact factory specifications, it eliminates the common failure points associated with generic