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attached. With flow going across the
flow ring, read the transducer output
voltage between the green and the
black wires. The difference between this
voltage and the zero flow voltage
should be 0.100 volts DC minimum (1"
Delta P equals 1.0 VDC, and voltage
should increase as flow increases). If a
0.100 volts DC minimum is not present,
check the transducer tubing with a
Magnehelic differential pressure gauge
and compare it with the delta pressure
(Delta P) chart located on the VAV box
to ensure that there are no clogs or
plugs. In order to see if the flow ring is
clogged or leaks, check with a
Magnehelic differential pressure gauge
to see if there is flow going across the
flow ring.
E.Calibrate the transducer. Calibration is
issued from EveryWare software
revision 1.35 by command function 6
(F6) (see the following procedure). This
will take effect immediately.
Note: Cycling power to the VAV board
will automatically cause the unit to
calibrate, however, following the proce-
dure outlined below will provide a more
accurate calibration. It is only necessary
to perform this procedure in instances
where you are experiencing incorrect
flow readings or if the unit reverts to
pressure dependent mode despite being
above 5% and below 110% of cataloged
flow and performing a "normal calibra-
tion" (i.e. hitting F6) does not correct the
problem.
Steps for Calibration:
1. Log on to the UCM with EveryWare
software.
2.Turn the central air handler "off. " If this
is not possible, Trane recommends
pulling the transducer tubes off during
the calibration process to simulate this.
3.Select the "calibrate unit" option by
pressing command function 6 (F6).
4.EveryWare software will indicate that
calibration is taking place.
5.When calibration is complete, the box
will release to auto.
6.Drive the box open to make sure that
the box is not below 5% of its cataloged
CFM. The controller is accurate in
40
Trouble
Analysis
reading flow from 5% to 110% of
cataloged CFM. For example, a size 17
air valve is accurate between 85 CFM
and 1870 CFM.
7 . Release the box to auto and perform
any necessary balancing work.
Wireless Receiver T rouble
Analysis
Wireless Zone Sensor Functional
Electrical Test
This check should be performed after a
zone sensor has been mounted and the
batteries have been installed. The cover
must be off.
If the sensor is equipped with a
temperature control, set the control dial
with "70" in the 9 o'clock position.
Press either one of the two push button
switches on the upper left side of the
sensor. The green LED near the bottom
of the circuit board should flash each
time the push button is pressed. If it
does not, check that both batteries are
good and are properly seated in the
holders.
In normal use, the green LED will flash
each time the zone sensor transmits a
message, usually several minutes
apart.
Checking Receiver Operation
This check should be performed after
all zone sensors for the receiver have
been installed. When power is applied,
check the operation of the three LED's
on the receiver as follows.
Green LED (Power Indicator): Indicates
24VAC power to receiver. Should be lit
continuously. If not lit, check 24-volt
transformer connections. If 24 VAC is
present but Green LED is off, return
receiver for service.
Red LED (VAV Link Activity
Communications Indicator): Will be lit
for a few seconds after power is
applied; when initialization is
completed, this LED will blink
periodically, indicating RS-485
communications to specific heating
and air conditioning equipment
assigned to the receiver.
Yellow LED (Radio Communication
Activity Signal Indicator): Will be lit for a
few seconds after power is applied:
when initialization is completed, this
LED will blink when a RF signal is being
received from a sensor.
Receiver will not upload from Receiver
Summary
1. Verify power to the receiver.
2.Verify the address on the receiver.
3.Verify polarity of the VAV Link.
4.Verify that the receiver is grounded.
Receiver uploads but no sensors are
reporting
1. The receiver/translator polls all of the
UCM's periodically to see if a new
sensor has been assigned then the
receiver/translator adds the serial
number to its list of sensors to monitor.
This process can take approximately 8
minutes.
2.Verify that the sensor is transmitting by
pressing the On or Cancel buttons on
the sensor and observing the green
LED on the sensor's circuit board next
to the setup tool connection. It should
flash to indicate a transmission.
3.If the sensor is transmitting, move it
within 20-30- feet, line of sight, of the
receiver and press the On or Cancel
buttons. The yellow LED on the receiver
should flash indicating that the signal
was received and immediately
afterwards the red LED should flash
indicating the message has been
translated and sent on the VAV link.
4.To check for a completed transmission,
plug the service tool into the sensor
and perform the RF transmission test
by pressing the "Send " key from the
default menu. The receiver will beep
twice to indicate a successful
transmission.
RSSI's are too low
1. Verify the antenna is properly installed
and making good contact with the
socket. The antenna must be vertically
oriented.
2.Check the location. Place the receiver in
an ideal location for radio reception to
verify it is working properly and then
move it to a more aesthetically pleasing
location while maintaining adequate
reception. An ideal location would be
central to all transmitters and not close
to any electrical equipment or large
metal structures.
VAV-SVX01B-EN
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