EarthLinked SCWD-024-1C, Quick Start Instructions

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SCWD-QS (12/16) Page 13
4) System Applications and Electrical
The SCWD compressor unit electrical box major components and electric data for all compressor
sizes are shown in Figure 6.
The SureStart Module is an optional factory installed component that (1) reduces compressor
starting current, (2) reduces compressor starting torque, thus reducing stress on the compressor at
start-up, and (3) monitors the run capacitor.
The electrical diagrams that follow include the
SureStart .
For compressor unit electrical diagrams that do not include SureStart, see the Appendix A.
The SCWD compressor units are equipped with a Nano-PLC (Programmable Logic Controller) to
provide a range of functions that enhance the comfort and efficiency of system operation. See
Appendix B detailing the Nano-PLC functions for the hydronic heating and cooling systems.
The Earth Loop Protection Control System, comprised of the EPS Power Supply, EPS Module and
EPS Fuse is contained within the electric box. This system is factory wired and ready to be
connected to the anode wire through an external electrical connection on the backside of the
compressor cabinet. The anode wire connection is detailed in a later section of this manual.
SCWD Heating and Cooling System electrical and application illustrations are as follows.
Figure 7. SCWD Compressor Unit Electrical Schematic Diagram, 230-1-60
Figure 8. SCWD Compressor Unit Electrical Schematic Diagram, 230-3-60
Figure 9. SCWD Hydronic Heating/Cooling/Water Heating System Application
Figure 10. SCWD Hydronic Heating/Cooling/Water Heating System Field Wiring Diagram