Maintenance - Mitsubishi PWFY-P36NMU-E-BU Service Handbook

[4] Maintenance

1. Section 1 Recovering and charging refrigerant from the R134a side
Before replacing the parts on PWFY-P36NMU-E-BU
(compressor, LEV, strainer (ST2), PHEX), be sure to
take the following steps.
[Recovering the refrigerant]
1. Stop all indoor and outdoor units, and turn off all
power supplies to the units.
1) Check that all indoor and outdoor units are stopped.
2. Recover all refrigerant remaining inside the unit through
the check joint.
Do not release the extracted refrigerant into the atmosphere.
[Charging refrigerant]
1. Evacuate air from the unit through the check joint.
Refer to section 1-[8] "Vacuum Drying" for detailed procedures.
2. Charge 1.1 kg of R134a through the check joint.
Check the Service Manual that came with the
outdoor unit for how to recover refrigerant from
or charge refrigerant into the outdoor units.
[Cleaning the water strainer]
1. Remove the caulking used to fill the space
between the insulation material and the unit.
2. Peel off the tape that is holding insulation
material together.
3. Remove the strainer, take the net out, and
clean it with a brush.
To remove the strainer, hold part A with a pipe
wrench so that the strainer will not move, and
loosen part B with a spanner.
Use two spanners to tighten or loosen the
strainer.
4. When cleaning is finished, replace the parts
in the reverse order as they were removed.
[Replacing the strainer]
1. Remove the caulking used to fill the space
between the insulation material and the unit.
2. Peel off the tape that is holding insulation
material together.
3. Hold part A with a spanner, and loosen part B
with a spanner by turning it counterclockwise,
and remove the strainer.
Use two spanners to tighten or loosen the
strainer.
4. Replace the parts in the reverse order as they
were removed.
Check joint (CJ)
Caulking material
Peel off the tape.
Caulking material
Peel off the tape.
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Part A
Part B
Remove the strainer
and clean it.
B
Rotation direction
A