Repair Procedures - Daikin altherma 3 M Service Manual

3 | Components

3.19.2 Repair procedures

To remove the refrigerant pressure sensor
Service manual
246
INFORMATION
Connect the service monitoring tool to monitor the high pressure.
If the measured output voltage value matches the voltage determined through the
measured pressure, but the pressure via the service monitoring tool is NOT correct,
replace the applicable PCB.
The measured voltage is inside the
expected range?
Yes
No
6 Unplug the refrigerant pressure sensor connector X17A 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
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
Prerequisite: Recuperate the refrigerant from the refrigerant circuit, see
"4.2.2 Repair procedures" [
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 Supply nitrogen to the refrigerant circuit. The nitrogen pressure MUST NOT
exceed 0.02 MPa.
4 Wrap a wet rag around the components near the refrigerant pressure sensor.
Heat the brazing point of the refrigerant pressure sensor pipe using an oxygen
acetylene torch and remove the refrigerant pressure sensor pipe from the
refrigerant pipe using pliers.
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 "3.19.2 Repair
Perform a check of the main PCB, see
"3.14 Main
4
291].
4
procedures" [
4
PCB" [ 171].
4
"3.17 Plate work" [ 230].
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
246].