14
eLeCTRICAL WIRIng
Cooling Only Connection
• Cooling only units utilize four (4) low voltage
interconnecting wires between indoor and outdoor
units.
• Connect each wire [COM1, COM2, SC, and
24 vDC (-)] to same named terminal indoor and
outdoor. See Figure 19
.
• Protect other unused wires or terminals, such as both
Rv, with wire nut from making contact with junction
box or other metal surfaces.
Heat pump Connection
• Heat Pump systems utilize six (6) low voltage
interconnecting wires between indoor and outdoor
units.
• Each wire [COM1, COM2, SC, 24 vDC (-), Rv, and Rv]
should connect to same named terminal indoor and
outdoor. See Figure 19 and Figure 20
.
• Rv signal is alternating current, as long as both
indoor Rv connections are connected to outdoor Rv
connections system will function correctly.
• The other four (4) wires are polarized and must be
connected to matching terminal.
All low voltage interconnect wiring must be at least
18 AWG.
figure 18 Wiring Connections
Low Voltage
Connections
Ground
L1
L2
figure 19 - Unit-Mounted Controls —
Cooling Only
figure 20 - Unit-Mounted Controls —
Heat pump Connection