Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 338

[8-13 Parts Replacement Instructions ]
(18A) Mount four-way valve (21S4a) to the pipe below four-way valve A and in the middle by brazing at the three areas. (See
Figure 18.)
Figure 18
(19A) Mount four-way valve (21S4a) to the pipe below four-way valve (21S4a) and on the front by brazing at the four areas.
(See Figure 19.)
Re-place the rubber spacer.
Figure 19
This step completes the replacement procedure for four-way valve (21S4a). Re-place the solenoid valve and LEV assembly
that were removed in step (8) and all the pipe covers that were removed during the maintenance work as they were.
BS_08_E
Reinstall these pipes.
chapter 8 -
83