Daikin VRV IV+ Service Manual page 352

3 | Components
Repair procedures
To remove the thermistor
Service manual
352
▪ E.g. R3T 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 X30A pin 1‑2:
Measured resistance: 21.8 kΩ,
▪ Measured resistance value is inside the range. R3T thermistor passes the
check.
INFORMATION
All thermistors have a resistance tolerance of 3%.
INFORMATION
Connect the service checker tool to the unit or use field settings mode 1 (see
"6.9 Field settings" [
If the measured resistance value matches the resistance determined through the
measured temperature, but the temperature for the corresponding thermistor via
service checker tool or field settings mode 1 is NOT correct, replace the applicable
PCB.
Does the measured resistance of the
thermistor match with the
temperature determined resistance?
Yes
No
Prerequisite: Stop the unit operation via the central controller.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
1 Locate the thermistor that needs to be removed.
2 Cut the tie strap that fixes the insulation and the thermistor wire.
4
455]) to monitor the thermistors.
Action
Thermistor is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
Replace the specific thermistor, see
"Repair
4
procedures" [ 352].
4
"3.15 Plate work" [ 315].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05