Zone
Zone
INSTALLATION & WIRING
VCB-X Controller Field Technical Guide
32
Digital Compressor Unloader Wiring
Digital Compressor Unloader
The Digital Compressor Unloader uses a solenoid unloader as the
capacity control method. The unloader solenoid is energized in an on/
off pattern to deliver the capacity needed by the digital compressor
to achieve setpoint.
Figure 18: Digital Compressor Unloader Wiring
The Unloader Solenoid output is a triac output. The maximum
continuous solenoid load is 0.5A and the peak inrush current is 6A.
Only (1) Digital Compressor can be controlled with the VCB-X
Controller.
See
Figure 18
below for wiring details.
24VAC
GND
Line
Voltage
Size Transformer For
Correct Total Load.
VCB-X Controller = 8 VA
DAMAGED
E-BUS
EXPANSION
E-BUS
EXPANSION
24 VAC
INPUT
VCB-X Controller
GND
+
_
GND
UNLOAD
Digital Compressor
24 VAC