Mitsubishi Electric PURY-P120Y(T)HMU-A, Service Handbook

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[
IX
Troubleshooting ]
- 322 - HWE0803A GB
2. Solenoid valve block ASSY (SV4a, SV4b, SV4c, SV4d), Check valve (CV4a, CV6a, CV8a, CV9a, CV10a) replacement
instructions
* Following instructions show procedures for replacing service parts for Solenoid valve block ASSY (SV4a, SV4b,
SV4c, SV4d), Check valve (CV4a, CV6a, CV8a, CV9a, CV10a). Replace them properly according to the procedures.
1. Applicable models
• PURY-P96, P120THMU-A (-BS), PURY-P96, P120YHMU-A (-BS)
2. Parts to be serviced, Set-content
Following instructions are applicable to 1-4 service parts on the table below.
NO. Parts to be serviced
1 Solenoid valve block ASSY
(SV4a, SV4b, SV4c, SV4d)
2 Check valve (CV4a, CV8a)
4 Check valve (CV6a, CV10a)
3 Check valve (CV9a)
Things required for replacing
Item
Solenoid valve block service parts set
[Set-content]
•
Replacement instructions
• Solenoid valve block ASSY
• Connecting pipe (
φ
9.52 [3/8"])
Numbers
1
1
1
1
Service parts replacement instructions set
[Set-content]
•
Replacement instructions
• Connecting pipe (
φ
9.52 [3/8"])
1
1
1
3. Procedures
* Precautions for starting replacement
• Check that the main power supply is OFF.
• Check that no refrigerant is in the outdoor unit.
Remove each part according to the 1)-3) procedures on the next page before replacing service parts.
Mount the removed parts back in place in a reversed procedures of 1)-3) on the next page after replacing service
parts.
(1) Solenoid valve block ASSY (SV4a, SV4b, SV4c, SV4d) replacement procedures
●
To remove Solenoid valve block ASSY
①
Remove the solenoid valve block coil cover, solenoid valve coil, and peripheral cables.
② Remove the screw (M5) that fixes the solenoid valve block and the supporting plate for solenoid valve block.
③ Cut the pipe at the position indicated on the next page with a pipe cutter. Remove the pipe from the brazed A part.
④
Debraze B-H parts (total 7 places).
⑤ Do not damage heat exchanger fins and peripheral piping devices when removing the Solenoid valve block ASSY.
●
To install Solenoid valve block ASSY
⑥ Mount the Solenoid valve block ASSY replacement to the unit with care not to damage heat exchanger fins and
peripheral piping devices.
Fix the Solenoid valve block ASSY and the supporting plate with the fixing screw (M5).
⑦
Braze B-H part (total 7 places), and connect the solenoid valve block and the heat exchanger header with the connect-
ing pipe (
φ
9.52 [3/8"]) that comes with the service parts set.
⑧ Mount the solenoid valve block coil cover, solenoid valve coil, and peripheral cables back in place.
* Precautions for replacing Solenoid valve block ASSY
• Be sure to perform no-oxidation brazing when brazing.
• After brazing, check the condition around the brazing. After confirming no leakage, evacuate the air
inside. (*1)
• Perform carefully with the flame direction so that it does not burn cables and plates etc. in the unit.
• Remove the brazing part protecting heat exchanger fins from burning, and replace the service parts.
*1: Refer to Chapter I [8] Vacuum Drying (Evacuation) for detailed procedure.