Mitsubishi Electric PUHY-HP72 Service Handbook page 255

[8-12 Parts Replacement Instructions ]
(17A) 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 17.)
Figure 17
(18A) 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 18.)
Re-place the rubber spacer.
Figure 18
This step completes the replacement procedure for four-way valve (21S4a). 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.
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Reinstall these pipes.
HWE18240_GB