Mitsubishi Air Conditioner PURY-P450YLM-A1

Following instructions show procedures for replacing service parts for Solenoid valve block ASSY (SV4a, SV4b, SV4d), Check valve (CV4a, CV6a, CV8a). Replace them properly according to the procedures.

Parts to be serviced, Set-content

Choose the check valve to be serviced

Precautions for starting replacement.

Is there no refrigerant in the outdoor unit?

Remove each part according to the 1)-3) procedures on the figure above right before replacing service parts.

Mount the removed parts back in place in a reversed procedure of 1)-3) on the figure next page after replacing service parts.

Check valve (CV4a, CV6a, CV8a) replacement procedures.

2. R410A CITY MULTI R2 Solenoid valve block ASSY (SV4a, SV4b, SV4d), Check valve (CV4a, CV6a, CV8a) replacement instructions.

* Following instructions show procedures for replacing service parts for Solenoid valve block ASSY (SV4a, SV4b,

SV4d), Check valve (CV4a, CV6a, CV8a). Replace them properly according to the procedures.

2. Parts to be serviced, Set-content

- Solenoid valve block ASSY (SV4a, SV4b, SV4d) - Solenoid valve block service parts set - KB00S879G26,

• Replacement instructions - WT07371X01.

• Solenoid valve block ASSY - KB00V530G01.

* Precautions for starting replacement.

Warning: This procedure requires trained personnel with PPE!

For the pressure sensors PS1 and PS3, refer to steps 1 and 2

Pressure sensor connector in trouble removed from the control board

New pressure sensor attached to the correct place

Connector inserted to the control board

Gas leaks from the pressure sensor?

Note: Secure enough service space in the ceiling for welding operation, and conduct the work carefully. If required, dismount the unit from the ceiling, and conduct the work.

Sign off on the disassembling process

(1) To check the inside of the control box, remove the two lock nuts on the control box cover.

1) Check the terminal connection of the power wire or of the transmission line.

(2) When the control board is replaced, the followings must be noted.

(1) Check that the board type is G1,GA1(HA1), or GB1(HB1).

(2) Check that the wire and the connector are properly connected.

It is not required to remove the two fixing screws on the control box when checking the inside.;