Orion System VCC-X Controller - Manual (Page 37)

VCC-X Controller Technical Guide
VCC-X CONTROLLER WIRING
37
Building Pressure Control Output Wiring
Figure 22: Building Pressure Control Output Wiring Diagram
Building Pressure Control Output
The Building Pressure Control Output is a 0-10 VDC or 2-10 VDC
signal sent from the VCC-X Controller. When using the output for
Direct Building Pressure Control (output signal rises on a rise in
building pressure), the output signal can be connected to either a
Variable Frequency Drive controlling an exhaust fan or to a damper
actuator controlling an exhaust damper (both by others). When used
in this manner, the output signal must be confi gured for Direct Acting
operation. See Figure 22 below for detailed wiring of the Building
Pressure Control Output Signal.
When using this output for Reverse Building Pressure Control
(output signal rises on a fall in building pressure), a damper
actuator controlling an OA Damper or Supply Fan VFD would be
used. When using the OA damper for Reverse Building Pressure
Control, the output signal must be confi gured for Reverse Acting
operation. A Building Pressure Sensor connected to AI5 on the
VCC-X Controller is used to sense and control the signal to the
Building Pressure Output. The OE258-01 Building Static Pressure
Sensor must be connected in order for the Building Pressure Output
to operate correctly.
CAUTION: Variable Frequency Drive units can cause
large transient noise spikes that can cause interference to be
propagated on other electronic equipment. Use shielded wire
wherever possible and route all sensor and controller wiring
away from the Variable Frequency Drive and the HVAC unit
electrical wiring.
VCC-X Controller
AOUT4
24VAC
GND
Line Voltage
Size Transformer For
Correct Total Load.
VCC-X Controller = 15 VA
0-10 VDC Input From AO1
GND GND
Shield Shield
24 V
A
C GND
+ +
Building Pressure Control
Exhaust Fan Variable Frequency Drive
(By Others)
_ GND
Caution: The VFD Unit Must Be
Configured For 0-10VDC Input. The Input
Resistance At The VFD Must Not Be
Less Than 1000 Ohms When Measured
At The VFD Terminals With All Input
Wires Removed.
Building Pressure Control
Damper Actuator
(By Others - Belimo Actuator Shown)
Wiring When Using Damper Actuator
For Building Pressure Control
Both Types Of
Building
Pressure Control
Devices Are
Shown
Only One Type
Of Building
Pressure Control
Device May Be
Used On Each
HVAC Unit
Wiring When Using Exhaust Fan VFD
For Building Pressure Control
3 Y1
2
1 - COM 1 - COM
Belimo Actuator Wiring
Shown. Consult
Factory For Other
Manufacturer Wiring
Instructions +
Note:
Wire To The VFD Using 18 GA
Minimum 2 Conductor Twisted Pair
With Shield Cable. Wire Shield To
GND As Shown
GND