Revised 8/14/02 • U551
9
© 2002 Automated Logic Corporation
Parameter page in SuperVision. Refer to one
of the UNI technical instructions documents
for details.
If you use a flow sensor with the U551, use
the Airflow microblock in the U551’s GFB.
To connect the sensor, make sure the U551’s
power is off first. Attach the total or high
pressure line from the VAV box to the
module’s HI side, and attach the static
pressure line to the module’s LO side.
Connect the USF to the U551 as shown in
Figure 11.
To ensure an accurate reading from the flow
sensor, use the Airflow microblock in the
module’s GFB. You must calibrate this
microblock using the instructions on the FB’s
Properties page in WebCTRL or Parameter
page in SuperVision. Refer to the
Eikon for
WebCTRL Microblock Reference Guide
or the
Eikon Microblock Reference Guide
for more
information.
NOTE
When installing the UDF, be sure to
permanently remove the W4 jumper as
shown in Figure 12 prior to performing test
and balance.
Writing GFBs for the U551
Depending on whether you are using a
WebCTRL or a SuperVision system, you must
use either Eikon for WebCTRL or Eikon 3.0a
or later to create GFBs for the U551. Be sure
Figure 11. Using the UDF
4"
10.2 cm
2.5"
6.4 cm
High
High
4321
STATIC
PRESSURE
TOTAL
PRESSURE
Flow #1
Flow #2
Low
Low
6"
15.2 cm
U module
Maximum Cable Length 4 ft.
Use 20 Gauge Wire
or ALC cable (part no. 235012)
NOTE: When making a sensor cable, disregard the
numbers imprinted on the plastic connector.
Figure 12. Removing the W4 Jumper
Gnd
IN-3
Gnd
IN-2
Gnd
IN-1
Remove
W4 jumper
W4
W3
W2
BOOT