Toshiba MMU-P0121H Service Manual page 144

3-11-2. Replacing Method of Compressor
After recovery of refrigerant has completed, turn off the power supply, and replace the compressor according to
the following method.
[In case of removal of the compressor from the front side]
1. Outdoor units (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
*
( : It is not provided in the cooling only model.)
• Remove the electric parts box. (M5 x 4, M4 x 3)
• Remove the pressure sensor installation plate.
(Do not remove the pressure sensor.) (M4 x 2)
• Remove the cooling duct for the electric parts. (M5 x 5)
• Remove the crank case heater. (Only for fixed-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 8.0 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.
NOTE :
Take a 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 been melted.
• Loosen the flare nut at the bottom side of the compressor to remove the pipe.
• 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. 100 kg.
• Remove the nuts fixing the compressor. (M12 x 3)
• 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) –7500 (cc) = Oil volume to be added (cc)
(If the calculated volume is minus value, addition is unnecessary.)
*
, PMV B and 4-way valve
Case
bypass pipe
Valve at bottom side
of the compressor
3-141
*
, etc.
Brazed positions
to be removed