Mitsubishi Electric HP120TNU-A Service Handbook page 311

[8-13 Parts Replacement Instructions ]
(13A) Install the pipe below four-way valve (21S4a) and in the middle by brazing at the three areas shown in Figure 13.
Figure 13
(14A) Install the pipe below four-way valve (21S4a) and on the front by brazing at the three areas shown in Figure 14.
Figure 14
This step completes the replacement procedure for four-way valve (21S4a). Re-place the components that were removed as
they were.
70
- chapter 8
Four-way valve (21S4a)
Area to be
brazed
Four-way valve (21S4a)
Area to be
brazed
Use the parts included with
four-way valve (21S4a).
LEV (LEV2d)
Reinstall these pipes.
HWE18220_GB