Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 361

[8-13 Parts Replacement Instructions (Outdoor Unit) ]
2. XL-module
Explained below is the procedure for replacing the check valves. (See Figure 1.)
Figure 1
(1) Remove three pipe covers. (See Figure 2.)
Figure 2
(2) Cut the pipe near the check valve in two areas where circled. (See Figure 3.)
Figure 3
*Notes on replacing refrigerant circuit parts (check valve block assemblies, four-way valves, solenoid valves, and LEVs)
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
Check valve (CV2a/b)
Pipe cover
Area to be cut
BS_08_L