Toshiba MMU-P0121H Service Manual page 146

<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.
[In case of removal of the compressor from the rear side]
1. Outdoor unit (Inverter and fixed-speed units)
080, 100 type
<Removing of parts>
• Remove the front panel. (M5 x 7)
• Disconnect all wires connected to the electric parts box.
Temp. sensor, pressure sensor, complete, 2-way valve,
*
PMV A , PMV B and 4-way valve
*
( : It is not provided in the cooling only model.)
• Remove the electric parts box. (M5 x 4, M4 x 3)
• Remove the cooling duct for the electric parts. (M5 x 5)
• Remove the crank case heater.
(Only for constant-speed unit)
• Remove the sound-proof mat.
• Remove the terminal cover of the compressor, and
remove all wires.
• Close the valve located under the compressor fully
using a hexadecimal wrench.
<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.
7.5 l or more oil may flow through the hose, so use a
container with capacity of 8 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 two discharge pipes, suction pipe, upper oil return piping, oil tank piping, and case bypass piping.
(Same as case of pulling out from the front side)
*
, etc.
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Accumlator
Oil tank
Compressor
Oil
separator