Mitsubishi Electric MUZ-FA25VA-E1 Service Manual page 3

Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy
New Specification
The incompatible refrigeration oil easily separates from
refrigerant and is in the upper layer inside the suction muffler.
Raising position of the oil back hole enables to back the
refrigeration oil of the upper layer to flow back to the
compressor.
Compressor
NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f
Conversion chart of refrigerant temperature and pressure
(MPa [Gauge])
4.0
3.5
R410A
3.0
R22
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-30 -20 -10 0
1.Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being
charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.
R410A tools Can R22 tools be used?
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
Flare tool
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
No : Not Substitutable for R410A
Suction muffler
Oil back hole
refrigeration oil
Refrigerant
(:)
10 20 30 40 50 60
R410A has high pressures beyond the measurement range of existing
gauges. Port diameters have been changed to prevent any other refrigerant
No
from being charged into the unit.
Hose material and cap size have been changed to improve the pressure
No
resistance.
No Dedicated for HFC refrigerant.
Yes
6.35 mm and 9.52 mm
No 12.7 mm
Yes Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
New Provided for flaring work (to be used with R22 flare tool).
Provided to prevent the back flow of oil. This adapter enables you to use
New
vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the
New
refrigerant bubbles due to high pressure and high-speed vaporization
Yes : Substitutable for R410A
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Current Specification
Since refrigerant and refrigeration oil are compatible each,
refrigeration oil goes back to the compressor through the
lower position oil back hole.
Compressor
f [Gauge])
NOTE : The unit of pressure has been changed to MPa on the
international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge])
Description
3
Suction muffler
Oil back hole
refrigeration oil /Refrigerant
f [Gauge])
=10.2(kgf/f