Thermistors; Refrigerant Side Thermistors - Daikin VRV IV+ Service Manual

3 Components
b
a Refrigerant pressure sensor
b Refrigerant pressure sensor pipe
CAUTION
Overheating the pressure sensor will damage or destroy it.
4 After soldering is done, stop the nitrogen supply after the
component has cooled‑down.
5 Route the refrigerant pressure sensor harness towards the
appropriate PCB.
6 Connect the refrigerant pressure sensor connector to the
appropriate PCB.
7 Fix the refrigerant pressure sensor harness using new tie
straps.
8 Add refrigerant to the refrigerant circuit, see
procedures" on page 136.
Is the problem solved?
Yes
No
3.17

Thermistors

3.17.1

Refrigerant side thermistors

Checking procedures
INFORMATION
It is recommended to perform the checks in the listed
order.
To perform a mechanical check of the specific thermistor
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 Locate the thermistor and remove the insulation if needed.
Check that the thermistor is correctly installed and that there is
thermal contact between the thermistor and the piping or
ambient (for air thermistor).
Service manual
128
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
a
"4.2.2 Repair
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
"3.13 Plate
Is the thermistor correctly
installed (thermal contact
between the thermistor and the
piping)?
Yes
No
To perform an electrical check of the specific thermistor
Prerequisite: First perform a mechanical check of the thermistor,
see "Checking procedures" on page 128.
1 Locate the thermistor.
INFORMATION
Remove the thermistor from its holder if not reachable with
a contact thermometer.
2 Measure the temperature using a contact thermometer.
Name Symbol Location
(PCB)
Air R1T Main
thermistor
Suction pipe R3T Main
thermistor
Refrigerant R4T Main
liquid
thermistor of
the outdoor
heat
exchanger
Refrigerant R5T Main
liquid
thermistor of
the subcool
heat
exchanger
Gas pipe R6T Main
thermistor of
the subcool
heat
exchanger
De‑icer R7T Main
thermistor
Compressor R8T Main
M1C body
thermistor
Compressor R9T Main
M2C body
thermistor
Compressor R21T Main
M1C
discharge
pipe
thermistor
Compressor R22T Main
M2C
discharge
pipe
thermistor
3 Determine the thermistor resistance that matches the measured
temperature.
Action
Perform an electrical check of the
specific thermistor, see
"Checking procedures" on
page 128.
Correctly install the thermistor,
see "Repair procedures" on
page 129.
Connector Type
(pins)
X18A:1‑3 1
X30A:1‑2 1
X30A:3‑4 1
X30A:5‑6 1
X30A:7‑8 1
X30A:9‑10 1
X19A:5‑6 2
X19A:7‑8 2
X19A:1‑2 2
X19A:3‑4 2
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07