18/5 wire is typically sufficient for standard heat pump systems requiring four or five leads

The unit features a standard 1/4 inch thread

While both use the same balanced port construction

ensuring the system guides airflow correctly for precise temperature control

OEM Precision: Direct replacement fit for York commercial units

Eaton Cutler-Hammer D3RF2A Relay 318423-701 18/5 wire is typically sufficientThe Eaton Cutler Hammer D3RF2A is a high performance DPDT (Double Pole Double Throw) ice cube relay designed for reliable switching in HVACR control circuits and industrial automation. Operating on a 120VAC coil voltage, this 8 pin general purpose relay provides consistent contact switching for logic level signals and power loads up to 10 Amps. The D3 Series plug in relay features a clear polycarbonate housing for easy visual inspection of the