Daikin Sky Air Advance RZA200D7Y1B, Service Manual

Page: 131 / 192

3 | Components
Service manual
131
250D7Y1B
Sky Air Advance-series
ESIE19-13A – 2020.05
7 Check that the measured resistance value matches the resistance determined
through the measured temperature (earlier step in the procedure).
▪ E.g. R1T thermistor:
▪ Measured temperature with contact thermometer: 23.1°C,
▪ Resistance value determined through temperature (using the table for type
1 thermistors):
Resistance at 23°C: 21.85 kΩ,
Resistance at 24°C: 20.90 kΩ,
▪ Disconnect connector and measure resistance between X18A pin 1‑3:
Measured resistance: 21.86 kΩ,
▪ Measured resistance value is inside the range. R1T thermistor passes the
check.
INFORMATION
All thermistors have a resistance tolerance of 3%.
INFORMATION
In most cases, the user interface allows to monitor the thermistors.
If the measured resistance value matches the resistance determined through the
measured temperature, but the temperature for the corresponding thermistor is
NOT correct on the user interface display, replace the applicable PCB.
Does the measured resistance of the
thermistor match with the
temperature determined resistance? Action
Yes Thermistor is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
No Replace the specific thermistor, see
"Repair procedures" [ 4 131].
Repair procedures
To remove the thermistor
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "3.12 Plate work" [
4
111].
1 Locate the thermistor that needs to be removed.
2 Cut the tie straps that fix the insulation and the thermistor wire.