Mitsubishi Electric HP120TNU-A Service Handbook page 322

[8-13 Parts Replacement Instructions ]
(9) Remove the pipe cover and the damper, and cut the suction pipe where indicated in Figure 9.
(10) Remove the pipe covers, and then remove the braze. (See Figure 10.)
* Do not force the injection pipe to deform.
(11) Remove the compressor discharge pipe by cutting the pipe where indicated in Figure 11 or by removing the braze.
S-module (Length: 260 mm)
L-module (Length: 350 mm)
Cut the suction
pipe here.
Figure 9
Cut the compressor
discharge pipe here.
Figure 11
(12) Remove the four bolts holding the compressor down. (See Figure 12.)
The two bolts in the front are also holding down the metal sheets.
(13) Tilting the compressor will cause the refrigerant oil to leak. Seal the pipe where it was cut or removed at the brazed section.
(14) Braze the suction pipe using a wet recommended felt sheet. Use caution not to damage the control box, ACC,
compressor cover, or dumper during brazing. (See Figure 13.)
*Precautions for replacing the compressor
Be sure to perform non-oxidized brazing.
Before heating the pipes, wrap the refrigerant circuit components with a wet towel to keep the temperature of the
components from rising above 120°C.
After brazing is done, check that the brazing is done properly and check for leaks before vacuum-drying the pipes.
Direct the brazing torch flame away from the wiring and sheet metals inside the unit not to damage them.
Wet felt sheets listed below (or its equivalent), and place them around the areas to be brazed to protect the heat
exchanger, pipes, and pipe covers from being damaged from the brazing torch flame.
Recommended felt sheets: Spatter felt 50CF-11 (5t x 1 m x 1 m) by TRUSCO Nakayama
Felt sheets that meet the JIS standard (JIS A 1323 type A "Flame retardant testing method for spark droplets of
welding and gas cutting on fabric sheets in construction works")
(15) The recommended tightening torque for the compressor fixing bolts is 3.0 N·m. Fasten the bolts using a torque wrench or
other tool that can apply the specified torque.
(16) Re-place the compressor covers in the reverse order as they were removed.
*Hold the TH15 wiring in place with the bands to keep the wiring from coming in contact with insulation 2. (See Figures 3
and 7.)
Compressor fixing bolts
Compressor fixing
metal sheets and bolts
Figure 12
HWE18220_GB
Pipe cover
S-module (Length: 260 mm)
L-module (Length: 350 mm)
Remove the two
pipe covers.
* Save the pipe
Damper and cable tie
S-module (Length: 260 mm)
L-module (Length: 350 mm)
Area to be brazed
covers for later
use.
Figure 10
Damper
ACC
Wet recommended felt sheet
Control box
Attach the supplied pipe.
Compressor
Figure 13
Remove the braze here.
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chapter 8 -