Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 345

[8-13 Parts Replacement Instructions ]
Replacement procedure for four-way valve (21S4c)
(10C) Install a flame-protection plate. (See Figure 9.)
Figure 9
(11C) Remove the braze from the area above four-way valve (21S4c) as shown in Figure 10.
Figure 10
(12C) Remove the braze from the two areas below four-way valve (21S4c) as shown in Figure 11.
Figure 11
(13C) Mount a new four-way valve (21S4c).
When installing four-way valve
(21S4c), first braze the pipe outside
the unit and then install it to the unit.
Figure 12
90
- chapter 8
Flame-protection plate
*Included with the replacement kit that contains four-way
valve (21S4c)
Remove the plate after replacing four-way valve (21S4c).
A cap for sealing the refrigerant
pipe is included with the
replacement kit that contains
four-way valve (21S4c).
Replace the old cap with the one
included with the four-way valve.
BS_08_E