MARS Azure 10874 Digi-Motor Condenser Fan Motor Overview
Product Introduction
This video introduces the Azure Condenser Fan Motor from MARS, specifically the 10874 Digi-Motor model. This constant speed ECM (Electronically Commutated Motor) is designed to replace standard PSC (Permanent Split Capacitor) condenser fan motors.
A key benefit of this ECM is its ability to maintain airflow more effectively, even through dirty or bent fins, compared to traditional PSC motors.
It is important to note that when sizing this high-efficiency ECM, amps should not be used as a direct comparison to PSC-equipped applications, as amps are an invalid comparison for motor shaft output between ECM and PSC motors.
The motor is rated for up to 1/3 horsepower shaft output, despite having a 2.4 amp rating.
Motor Setup and Operating Modes
To set up the motor, use the included cord to plug it into any standard 120-volt outlet. This will not damage the motor.
The motor will briefly spin to demonstrate its four operating modes. These modes include:
- 1075 RPM Clockwise (CW) or Counter-Clockwise (CCW)
- 825 RPM Clockwise (CW) or Counter-Clockwise (CCW)
To select a desired operating mode, simply remove the 120-volt power during the mode being shown. The speed and rotation will then be permanently locked in.
To change the speed and rotation again, apply another 120-volt signal using a hot 120-volt line and a neutral. A hot 120-volt line and a ground will not work for this purpose.
Installation Considerations
For installation, attach the outboard surge protector to the harness. Connect the two leads to the DP (Double Pole) contactor and the ground to a suitable ground. This motor does not require a capacitor.
If the external surge protector fails, it can be replaced or removed from the harness, and the motor can be reconnected directly to the contactor. The motor has a secondary internal surge protector that will likely still be functional, allowing the motor to remain operational.
The motor is compatible with both one-pole and two-pole DP contactors. In the case of a one-pole DP contactor, a 120-volt signal will continuously go into the motor via a shunt. However, the motor will not enter programming mode without a neutral in the circuit.
