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Installation (continued)
4. Optional Wiring Connections:
4.1 Analog Output Signal:
Both 4-20mA and 2-10VDC are available. Connect signal wire into corresponding terminals on block TB3. If
using 4-20 mA, a load resistor between 200 and 900 ohms is required, field supplied. If two or more outputs
share a common connection, a signal isolator may be required.
Update settings within electronics (see page 7): Use the touch screen to select the 4-20 mA or 2-10 VDC
output signal via the setup menu.
4.2. Network Protocol:
Both BACnet MSTP and Modbus RTU are enabled. Connect appropriate wiring to block TB3. Adjust switch,
SW1, to 2-wire (left) or 4-wire (right) as required. Reference network protocol section for more information.
Update settings within electronics (page 7):
Switch SW1: 2-Wire / 4-Wire
Select:
• Left Position = 2-Wire
• Right Position = 4-Wire
4.3. Temperature Density Compensation:
Temperature compensation can adjust airflow calculation based on changing airstream temperatures. If
temperature compensation is not used, the air density value will be a function of standard air (70°F / 21°C).
The supplied sensor measures the exterior temperature of the ductwork, only screw holes are required.
Mount the sensor in contact with the ductwork.
Wire the temperature sensor into corresponding terminals on block TB3 (wiring supplied by others).
Update settings within electronics (page 5): In the setup menu change Temperature Compensation to "Yes".
Confirm that this is set to "Yes".
5. Close and tighten screws on cover:
When the required preceding steps are complete, make sure the front cover is properly aligned to the housing
and the two captive thumb screws are securely tightened.
Wiring Diagram
®
Sure-Aire™ Flow Monitoring System
3
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