Ingersoll-Rand ReliaTel, Manual, Page: 111 / 176

RT-SVD03L-EN 111
Problems to Look for:
• Mis-wire/short/open
• Excessive resistance in circuit (corroded or loose
connection)
• Induced voltage (high voltage wires in same
conduit)
Table 83. Zone sensor readings
System
switch
Fan switch
Ohms
Rx1K
Volts DC
+- 5%
Short to
common
0 0
OFF AUTO 2.32 0.94
COOL AUTO 4.87 1.64
AUTO AUTO 7.68 2.17
OFF ON 10.77 2.59
COOL ON 13.32 2.85
AUTO ON 16.13 3.08
HEAT AUTO 19.48 3.3
HEAT ON 27.93 3.68
EM HEAT AUTO 35 3.88
EM HEAT ON 43.45 4.06
Open circuit
5
Programmable Zone Sensor
BAYSENS119* and
BAYSENS019C (Obsolete)
The BAYSENS119* Programmable Zone sensor is a
digital display sensor that communicates to micro
controls. This programmable sensor is compatible with
the following constant volume (CV) units:
• Voyager ™ UCP 3 to 25 tons
• Voyager ™ UCP 27.5 to 50 tons CV
• Precedent ™ ReliaTel ™ 3 to 10 tons
• Voyager ™ ReliaTel ™ 12.5 to 25 tons
• Voyager ™ ReliaTel ™ 27.5 to 50 tons CV
• IntelliPak ™ Rooftop 20 to 130 tons CV
• Odyssey ™ ReliaTel ™ 6 to 20 tons
For programming information, refer to literature ACC-
SVN28*-EN.
Testing the Programmable Zone Sensor
(PZS)
1. Verify unit operation by running unit through test
mode.
2. Verify that the PZS has a normal display of time,
temperature, fan and system status.
3. For UCP Micro, disconnect wires from LTB-11 (-)
and LTB-12 (+); For ReliaTel ™ l controls, disconnect
wires from J6-11 and J6-12. Measure the dc voltage
between terminals 11 and 12. Voltage should read
between 28 to 32 vdc. If no voltage is present for
UCP micro, check wiring between UCP and LTB.
4. Reconnect wires to terminals 11 and 12. Measure
the voltage between 11 and 12 again. Voltage
should flash at 0.5 second rate, with a voltage value
randomly changing from approximately 24 to 32
vdc.
5. On the PZS, press the FAN button to turn the fan
ON. If the fan comes on, the PZS is good; if the fan
does not come on, the PZS may be defective and
will need to be replaced.
N No otte e:: The sensor will not communicate if the
wrong baud rate is selected. The PZS is
shipped with the baud rate set to 1200. See
option menu setup in the literature to verify
proper baud rate. The baud rate may need to
be changed to 1024 for units built before 1/96.
Troubleshooting the Programmable
Zone Sensor
Because the PZS is a communicating sensor,
troubleshooting is very limited. Step 2 through Step 5
of testing the sensor are the first steps to verify. The
following table will provide other troubleshooting tips
for diagnosing the sensor and unit operations.
If all wiring and preliminary tests do not indicate any
defects, disconnect the PZS from the wall and take to
the unit, and with a short (approx. two feet) length of
thermostat wire, connect the PZS and see if symptoms
still exist. If not, check for thermostat wire routing in
close proximity of high voltage wires and fluorescent
lights.
Table 84. Troubleshooting
Symptom
Probable Cause and solution
Display does not come
on.
Check for 24 vac on terminals 11 and
12 of the sensor.
No communication
with unit.
Verify a varying voltage per step 2 of
testing the sensor. If no voltage is
present, check with wiring to unit.
Sensor is
communicating, but
unit won’t run
Check option 18 in Option Menu setup
for correct baud rate.
Displayed zone
temperature is
different from actual
temperature.
Follow Option Menu setup in literature
to calibrate the display.
Zone temperature is
not displayed
Check option selection in Option
menu setup
Z Zo on ne e S Se en nsso orr M Mo od du ulle e T Te essttiin ng g