Mitsubishi Electric PUHY-HP200YNW-A Service Handbook page 245

[8-12 Parts Replacement Instructions ]
(23B) Mount four-way valve (21S4b) to the pipe below four-way valve (21S4b) and in the middle. A total of five areas require
brazing, including the area indicated in (22B) and the areas indicated in Figure 22.
Mount four-way valve (21S4b) horizontal to four-way valve (21S4a) as shown in (14A).
Figure 22
(24B) Install the pipe below four-way valve (21S4b) and on the front by brazing at the two areas shown in Figure 23.
Re-place the rubber spacer.
Figure 23
This step completes the replacement procedure for four-way valve (21S4b). Re-place the solenoid valve and LEV assembly
that were removed in step (7) and all the pipe covers that were removed during the maintenance work as they were.
58
- chapter 8
When installing four-way valve
(21S4b), first braze the pipe
outside the unit and then install it
to the unit.
Reinstall these pipes.
BS_08_M