Toshiba MMU-P0121H Service Manual page 148

<Extraction of oil from compressor>
• Cut the case bypass located at the bottom of the
compressor by height same as that of the suction pipe.
• Connect hose to the cut case bypass, and insert the
opposite side of the hose in the container which oil is
entered. 2.0 l or more oil may flow through the hose,
so use a container with capacity of 2.5 l or more.
• Apply nitrogen gas with approx. 0.02MPa from
service valve at gas side to extract oil.
(Extract oil completely.) (Be sure to spurt of oil
when gas is applied exceedingly.)
<Removing of compressor>
• Remove the discharge pipe, suction pipe, upper oil
return piping, oil tank piping, and case bypass piping.
(Same as case of pulling out from the front side)
NOTE :
Take great care that, in case of removing the pipe by heating with a torch the brazed part, if oil is remaining in the
pipe, a flame may be emitted at the moment when flux has melted.
• Loosen the flare nut at the bottom side of the compressor to remove the pipe.
• Remove the metal fixing the oil tank. (M4 x 2)
• Remove the oil tank. (Two brazing positions)
NOTE :
Take great care that, in case of removing the pipe by heating with a torch the brazed part, if oil is remaining in the
pipe, a flame may be emitted at the moment when flux has melted.
• Remove the screws fixing the bottom plate for the compressor. (M5 x 6)
• Pull out the compressor with the bottom plate for the compressor.
NOTE :
Weight of the compressor is approx. 45kg.
• Remove the nuts fixing the compressor. (M8 x 4)
• Remove the compressor.
<Measurement of oil volume>
• Measure oil volume extracted from the compressor, and determine whether to add oil or not.
Recovered oil volume (cc) –2000 (cc) = Oil volume to be added (cc)
(If the calculated volume is minus value, addition is unnecessary.)
<Charging of oil>
Insert the hose up to the end of suction pipe mounting part of the compressor to be installed, and add the
necessary amount of oil using a funnel, etc.
<Installation>
• Install the compressor in the reverse order of removing of compressor.
NOTE :
After installation, open fully the valve at bottom side of the compressor, using hexagonal wrench.
<Vacuuming>
• Connect the vacuum pump to the check joint of the discharge and suction pipes, and operate the vacuum pump.
• Perform vacuuming until the vacuum low-pressure gauge indicates 1 (mmHg).
<Charging of refrigerant>
Add refrigerant of the same volume to the recovered refrigerant into the check joint of the suction pipe.
Brazed positions
to be removed
3-145
Compressor
Oil tank
Fixing bracket