Repair Procedures - Daikin VRV IV+ Service Manual

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V (DC)
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
INFORMATION
The refrigerant pressure sensor connector MUST be
plugged into the appropriate PCB.
4 Measure the voltage on X31A: pins 2–3 (= refrigerant pressure
output signal) on the main PCB.
5 Check that the measured voltage is in line with the expected
voltage through the read refrigerant pressure.
INFORMATION
Connect the service checker tool to the unit or use field
settings mode 1‑43 (see
to monitor the low pressure.
If the measured output voltage value matches the voltage
determined through the measured pressure, but the
pressure is NOT correct on the user interface display,
replace the applicable PCB.
The measured voltage is inside
the expected range?
Yes
No
6 Unplug the refrigerant pressure sensor connector X31A and
measure the voltage (power supply) between pins 3–4 on main
PCB.
Result: The measured voltage MUST be +5 V DC.
Is the measured voltage
+5 V DC?
Yes
No
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
2
Detected pressure kg/cm
8.77
9.35
9.93
10.51
11.09
11.68
12.26
12.84
13.42
14.00
14.58
15.16
15.74
16.33
16.91
17.49
18.07
18.65
19.23
19.81
"6.9 Field settings" on page 188)
Action
Refrigerant pressure sensor is
OK. Return to the
troubleshooting of the specific
error and continue with the next
procedure.
Continue with the next step.
Then
Replace the refrigerant pressure
sensor, see "3.16.2 Repair
procedures" on page 127.
Perform a check of the main
PCB, see "3.9.1 Checking
procedures" on page 106.
3.16.2

Repair procedures

To remove the refrigerant pressure sensor
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.
Prerequisite: Recuperate the refrigerant from the refrigerant circuit,
see "4.2.2 Repair procedures" on
Prerequisite: If needed, remove any parts or insulation to create
more space for the removal.
1 Cut all tie straps that fix the refrigerant pressure sensor
harness.
2 Disconnect the refrigerant pressure sensor connector from the
PCB.
3 Cut the refrigerant pressure sensor pipe using a pipe cutter.
b
a Refrigerant pressure sensor
b Refrigerant pressure sensor pipe
4 Remove the refrigerant pressure sensor.
5 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
6 Heat the end of the refrigerant pressure sensor pipe using an
oxygen acetylene torch and remove the refrigerant pressure
sensor pipe end.
7 Stop the nitrogen supply when the piping has cooled down.
8 To install the refrigerant pressure sensor, see
procedures" on page 127.
To install the refrigerant pressure sensor
1 Install the refrigerant pressure sensor in the correct location.
2 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
3 Wrap a wet rag around the refrigerant pressure sensor and
solder the refrigerant pressure sensor pipe to the refrigerant
pressure sensor.
3 Components
"3.13 Plate
page 136.
a
"3.16.2 Repair
Service manual
127