Mitsubishi Electric PUHY-HP72 Service Handbook page 275

[8-12 Parts Replacement Instructions ]
(8) Remove the braze at the four areas on the accumulator inlet and outlet pipes shown in Figure 7.
Inlet pipe
Suction pipe (Outlet pipe)
Figure 7
(9) Re-place the accumulator in the reverse order as it was removed.
Re-place the components that were removed as they were.
*Notes on replacing refrigerant circuit components (accumulator)
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")
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- chapter 8
S-module suction pipe L-module suction pipe
HWE18240_GB