Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 339

[8-13 Parts Replacement Instructions ]
2. S, L-module (four-way valve (21S4b))
Explained below is the procedure for replacing four-way valve (21S4b) (on the left when seen from the front of the unit).
Secure sufficient work space before starting maintenance work. (See 8-13-1 Ensuring Maintenance Space (Preparation for the
Maintenance of Refrigerant Circuit Parts).)
(20B) Follow the same procedures ((1) through (8), (9A), and (12A)) for replacing four-way valve (21S4a).
(21B) Remove the pipe below four-way valve (21S4b) and on the front by removing the braze at the two areas shown in
Figure 20.
Remove the rubber spacer.
Figure 20
(22B) Remove four-way valve (21S4b) by removing the braze from the area above four-way valve (21S4b) as shown in Figure
21.
Figure 21
(23B) To make it easier to connect four-way valve (21S4b), cut the pipe end below the raised hole (cut off the section covered
with brazing filler) on the pipe with a pipe cutter. Cut the pipe with an expanded end that is included with four-way valve
(21S4b) to the same length as the pipe that was removed from the on-site pipe. (See Figure 22.)
Figure 22
84
- chapter 8
Pipe diameter: φ12.7
Cut the pipe here.
ID of the pipe with an extended end: φ12.7
Severed pipe
After being removed, leave the pipes at the bottom
inside the unit.
(Once removed from the unit, it will be difficult to
re-place the pipes.)
A cap for sealing the refrigerant pipe
is included with four-way valve
(21S4b).
Replace the old cap with the one
included with the four-way valve.
Cut the pipe with an expanded end that is included
with four-way valve (21S4b) so that the section of
the pipe excluding the extended end will be the
same length as the pipe that was removed from the
on-site pipe.
*The included pipe with an expanded end is 100
mm long. Cut it to the appropriate length.
BS_08_E