ESIE16-03B | Part 2. Troubleshooting 2.4. Component checklist22/08/16 | Version 1.1 Page 57SA R32 Sky-Air RZAG-L2.4.2.8. Refrigerant thermistors1. Switch off the Daikin unit via the user interface.2. Switch off the Daikin unit with the field supplied circuit breaker.3. Locate the thermistor and check if thermal contact with the piping or ambient is ensured.1. Switch off the Daikin unit via the user interface.2. Switch off the Daikin unit with the field supplied circuit breaker.3. Remove plate work when required.4. From the table in the appendix ("Component checklist" on page 121), select the thermistor that must be checked.5. Measure the temperature of the thermistor using a contact thermometer.6. Unplug the connector from the appropriate PCB and measure the resistance between the pins listed in the table in theappendix ("Component checklist" on page 121).- Compare the measured resistance with the range determined by the lower and higher temperature.7. If the measured resistance does not match the listed value, the thermistor must be replaced.E.g. R3T air thermistor - main PCB - connector S90: pin 1-2 type 1:• Measured temperature with contact thermometer: 23.1°C.• Unplug the sensor and measure the resistance between S90: 1-2: 21.86 kΩ.• The resistance values are defined by below table "Thermistor resistance / temperature characteristics (type 1)":- Resistance at 23°C: 21.85 kΩ.- Resistance at 24°C: 20.90 kΩ.Technical specification DescriptionA single type of thermistor is used; the resistance vs. tempera-ture characteristics is shown in below table "Thermistor resist-ance / temperature characteristics (type 1)".The thermistors are used to measure the temperature at multiplelocations inside the Daikin unit. The measured temperatures areprocessed by the main board.LocationPiping diagram Wiring diagram Switch box Component overview of unitSee "Outdoor unit" onpage 117.See "Outdoor unit" onpage 115.See "Outdoor unit" onpage 122.See "Outdoor unit" on page 119.Check procedureMechanical checkElectrical checkINFORMATIONIf a thermistor check fails, replace the thermistor.WARNING : R ISK OF FIREWhen reconnecting a connector to the PCB, do not apply force, as this may damage the connector or connector pins ofthe PCB.INFORMATIONAll thermistors have a tolerance of 5%.
