Repair Procedures - Daikin VRV IV+ Service Manual

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51.0
45.9
40.8
35.7
30.6
25.5
a
20.4
15.3
10.2
5.1
0
-5.1
-0.5 0 0.5 1 1.5 2
b
a Detected pressure (kg/cm²)
b Output voltage (V)
V (DC)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
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
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
2.5 3 3.5 4
2
Detected pressure kg/cm
0.00
1.43
2.86
4.28
5.71
7.14
8.57
10.00
11.42
12.85
14.28
15.71
17.14
18.56
19.99
21.42
22.85
24.28
25.70
27.13
28.56
29.99
31.42
32.84
34.27
35.70
37.13
38.56
39.98
41.41
42.84
44.27
45.70
V (DC)
3.8
3.9
4 Measure the voltage on X32A: pins 1–3 (= refrigerant pressure
sensor output signal).
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 1‑42 (see
to monitor the high 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 main PCB.
The measured voltage is inside
the expected range?
Yes
No
6 Unplug the refrigerant pressure sensor connector X32A 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
3.15.2

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.
3 Components
2
Detected pressure kg/cm
47.12
48.55
"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.
"3.13 Plate
page 136.
Service manual
125