the blower motor running constantly with no heat

It operates on 24V AC low voltage systems and is fully compatible with millivolt heating applications

Is the R38999D019 compatible with all Armstrong Air furnaces

Constructed from high-gauge

Daikin-McQuay 4009588 Motor 319852-301 the blower motor running constantlyThe Daikin McQuay 4009588 Motor is a high efficiency DC330v 61W 8P brushless motor designed for precise airflow control in commercial HVAC systems. This 8 pole direct current fan motor is engineered for low noise operation and high thermal stability, ensuring consistent torque across the RPM range. Built to replace aging or failing HVAC blower motors, the 4009588 maintains the exact voltage and wattage parameters required for OEM system integration.