Other Thermistors; Third Party Components; Electrical Circuit; Checking Procedures - Daikin VRV IV+ Service Manual

4 Third party components

f Thermistor
3 Slide the insulation aside.
4 Pull the clip that fixes the thermistor.
5 Remove the thermistor from the thermistor holder.
6 Cut all tie straps that fix the thermistor harness.
INFORMATION
Some of the thermistors are wired to the same connector.
See connector and pin information of the thermistors at the
start of the electrical check procedure and
diagram" on page 146. ALWAYS replace the complete set
of thermistors wired to the same connector.
7 When removing the complete set of thermistors wired to the
same connector:
▪ Remove all other thermistors wired to the connector from
their thermistor holder,
▪ Disconnect the thermistor connector from the appropriate
PCB,
▪ Remove the complete set of thermistors.
8 To install the thermistor, see
To install the thermistor
1 Pull the clip and install the thermistor in the specific thermistor
holder. Make sure the clip is in the correct position (blocking the
thermistor).
b
a
c
a Tie strap
b Insulation
c Thermistor wire
d Clip
e Thermistor holder
f Thermistor
2 Route the thermistor harness towards the appropriate PCB.
3 Connect the thermistor connector to the appropriate PCB.
INFORMATION
Some of the thermistors are wired to the same connector.
See connector and pin information of the thermistors at the
start of the electrical check procedure and
diagram" on page 146. ALWAYS replace the complete set
of thermistors wired to the same connector.
4 When installing the complete set of thermistors wired to the
same connector:
▪ Install all other thermistors wired to the connector in their
thermistor holder,
▪ Route the thermistor harness of all thermistors towards the
appropriate PCB,
▪ Connect the thermistor connector to the appropriate PCB.
Service manual
130
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
"6.2 Wiring
"Repair procedures" on page 129.
b
d
"6.2 Wiring
WARNING
When reconnecting a connector to the PCB, do NOT apply
force, as this may damage the connector or connector pins
of the PCB.
5 Fix the thermistor harness using new tie straps.
6 Install the insulation around the thermistor.
7 Fix the insulation and the thermistor wire using new tie straps.
Is the problem solved?
Yes
No
3.17.2

Other thermistors

Checking procedures

To perform an electrical check of the specific PCB fin
thermistor
1 Stop operation of the outdoor unit and wait for at least
30 minutes.
2 Measure the ambient temperature close to the outdoor unit.
3 Connect the service checker tool to the outdoor unit.
4 Read the temperature of the specific PCB fin thermistor. The
read temperature MUST correspond to the measured ambient
temperature.
Does the temperature of the fin
thermistor match with the
ambient temperature?
Yes
No
e
f
4 Third party components
4.1

Electrical circuit

4.1.1 Checking procedures
To check the power supply of the unit
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
work" on page 118.
1 Measure the insulation resistance between each power supply
terminal and the ground using a megger device of at least
500 V DC. All measurements MUST be >1MΩ. If insulation
resistance is <1MΩ, earth leakage is present.
2 Turn ON the unit using the respective circuit breaker.
3 Measure the voltage between the phases L1‑L2‑L3 on the
power supply terminal X1M. The voltage MUST be 400 V AC ±
10%.
4 Measure the voltage between each phase and N on the power
supply terminal X1M. The voltage MUST be 230 V AC ± 10%.
5 Unbalance between the phases MUST NOT exceed 2%.
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
Action
Thermistor is OK. Return to the
troubleshooting of the specific
error and continue with the next
procedure.
Replace the specific PCB, see
"3 Components" on page 77.
"3.13 Plate
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07