The Aprilaire 4977 Relay is a high-performance 24v Coil DPDT Relay designed for seamless integration within advanced HVACR systems

although it can be field-converted for power-open applications in minutes

this is a model-specific 328130-701 harness

Key Benefits: Precision Control: The electromagnetic coil provides rapid-response fluid flow control

It features a high-grade centrifugal blower assembly and ball bearing construction to handle high-temperature exhaust environments without premature failure

Fasco D0593 Motor 320788-702 The Aprilaire 4977 Relay isThe Fasco D0593 Motor is a high performance 1 6 HP 208 230V single phase fan and blower motor, widely utilized in commercial air handlers, fan coil units, and attic ventilators. Built in a 42 frame with a compact 5 inch diameter, this PSC (Permanent Split Capacitor) motor operates at a consistent 1550 RPM and requires a 7. 5 Mfd 370V capacitor for optimal torque and efficiency. Designed with Open Air Over (OAO) ventilation and Class B insulation, it