Panasonic 8900 SH installation manual Sensor Troubleshooting, General Troubleshooting

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Series 8900SH Control Panel

Operation And Installation Manual

SECTION 5: SENSOR TROUBLESHOOTING

The wiring within the control panel from the Terminal Strip For Field Connections to the sensor input terminals on the circuit board are completed at the factory.

Inside the panel is a second set of wires from each sensor to the “Terminal Strip For Field Connections” that is generally completed by the electrical contractor.

Each pair of wires from a sensor is connected to the terminal strip inside the panel (for field wiring) and from there to the sensor input terminals on the circuit board. Below is a list of where the wires for each sensor are attached and the code that allows you to read the temperature.

SENSOR LOCATION

INPUT TERMINALS

ENTER CODE

Outside Sensor

S1

11

Return Sensor

S2

12

GENERAL TROUBLESHOOTING

If the display is showing Error Code 230, either the sensor is bad or a wire is broken. To check the wire between the input terminals on the circuit board and the sensor itself remove the circuit board cover and, using the chart above, identify the correct sensor. With a small screwdriver, loosen the two terminals and gently remove both wires. With an Ohm metor, check the resistance (continuity) between the two wires. No resistance (continuity) indicates a wire is broken. The second test is to attach a good sensor to the terminal strip in place of the one removed. If the display now reads a temperature then the old sensor is probably bad and should be replaced.

If the display is showing Error Code -40, the wires either have a short or the wires are reversed at the sensor input terminals. Each sensor has a positive wire and a negative wire that could have been reversed during installation. To test for this, remove the cover and reverse the wires. If the display now reads a temperature the problem is solved.

If the display still reads Error Code -40the wiring between the sensor terminal input and the sensor itself must be checked for shorts. Remove the wires from the terminal strip and, using an Ohm meter set at 1K, touch the Ohm motor leads together and adjust the needle to 1. Now touch the Ohm meter leads to the wires from the sensor. If the needle again goes to 1, or the and of the scale, the wires are shorted. If the needle only moves part way up the scale, the sensor is bad and must be replaced.

If you are adjusting a sensor potentiometer R26 through R31, and the display is not changing, make sure the correct monitor code for the sensor being adjusted has been entered. If the code is correct and the display still will not change, replace the sensor.

If the sensor has been replaced and the display continues to show the incorrect temperature, the control panel may be bad. Try a different sensor by switching them around on the terninal strip. If this still does not work, send the the board back to TRIAD for recalibration.

Section 5

Sensor Troubleshooting

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Contents Triad Boiler Systems, Inc Table of Contents Installation Procedures IntroductionKeypad with Entry Procedures Startup ProceduresOperation And Installation Manual Wiring Diagram Outdoor and Return Water Line Sensors Series 8900SH Specifications CPUGlossary Limited Five -YEAR Full Term Warranty Sequence of Operation Operation And Installation Manual Entry Codes This code starts the sequence for the 60 codes50-57 Worksheet For Code Settings Code Function SettingsSensor Calibration CalibrationOperation And Installation Manual Sensor Troubleshooting General TroubleshootingMonitoring Codes Code DisplayOther Important Items Error Codes Display ExplanationPage Entry Code 21 Outside Temperature Shutdown Setting Entry Code DetailsEntry Code 22 Minimum Return Water Temperature Setting Enter Your ChoiceEntry Code 24 Rate of Change Factor Entry Code 26 Number of Boilers to be ControlledEntry Code 28 Outside Design Temperature Setting Entry Code 30 37 Water Temperature Setback Schedules = 600 AM, 5F Setback = 600 AM, 0F SetbackEntry Code 40 42 Stage /RELAY /BOILER Activation on Press = Save KEY, to have Boilers 9 Through 12 Entered Entry Code 62 System Mode Entry Code 61 Keyboard Lock Unlock PressEntry Code 63 Manual Override of Boiler Stages Entry Code 65 Manual Override of the System Primary Pump Entry Code 66 Setback on / OFF PressEntry Code 67 24 Hour Clock Hour and Minute Entry Code 68 DAY of the Week and Date of the MonthEntry Code 69 Month and Year Entry Code 81 Setback Override Fine Tuning the Heating System Codes 30 toOperation And Installation Manual Troubleshooting Building Experiences a Power OutageControl Panel will not Accept Entries

8900 SH specifications

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