RT-SVD03G-EN 81
Zone Sensor Module Testing
Programmable Zone Sensor BAYSENS119A
and BAYSENS019C (Obsolete)
The BAYSENS019B, C 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 3-25 tons
• Voyager UCP 27.5-50 tons CV
• Precedent ReliaTel 3-10 tons
• Voyager ReliaTel 12.5-25 tons
• Voyager ReliaTel 27.5-50 tons CV
• IntelliPak Rooftop 20-130 tons CV
• Odyssey ReliaTel 7.5-20 tons
For programming information, refer to literature ACC-SVN28A-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 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.
Note: 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. Steps 2 through 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.
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