Zone
Zone
INSTALLATION & WIRING
VCB-X Controller Field Technical Guide
38
Static Pressure Transducer Wiring
Figure 24: OE271 Static Pressure Transducer Wiring Diagram
Static Pressure Transducer
The OE271 Static Pressure Transducer plugs directly into the VCB-X
EM1 Expansion Module’s Static Pressure port. The Duct Static
Pressure Sensor reading is used to determine current Duct Static
Pressure. This Static Pressure reading is used to control the output
signal supplied to the Supply Fan VFD or Zoning Bypass Damper
Actuator. If you have confi gured the HVAC unit for Constant Volume
operation, this Sensor is optional. If it is installed on a Constant
Volume unit, it will not affect operation, but rather will be used as a
status-only reading. See
Figure 24
below for detailed wiring.
CAUTION:
It is strongly recommended that you use pneumatic
tubing instead of relocating the sensor. Extending the wires
could cause voltage drop problems.
Connect FRP Tubing To High Pressure
Port (Bottom Tube) and Route To Static
Pressure Pickup Probe Located In Unit
Discharge. Leave Port Marked “Lo” Open
To Atmosphere.
OE271
Static Pressure
Transducer
Splice If Required
(Not Recommended.
See Note)
CAUTION: It Is Strongly Recommended
That You Use Pneumatic Tubing Instead Of
Relocating The Sensor. Extending The Wires
Could Cause Voltage Drop Problems.
24VAC
GND
Line Voltage
Size Transformer For
Correct Total Load.
VCB-X E 1 = 5 VA
M
VCB-X EM1
Expansion Module
Revised 7/30/13
