Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 337

[8-13 Parts Replacement Instructions ]
(14A) Remove four-way valve (21S4a) by removing the braze from the area above four-way valve (21S4a) as shown in Figure
14.
Figure 14
(15A) Mount a new four-way valve (21S4a). Figure 15 shows how to position a new four-way valve.
When seen from above, four-way valves (21S4a and 21S4b) are tilted by 15°.
15°
Figure 15
(16A) To make it easier to connect four-way valve (21S4a), 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
(21S4a) to the same length as the pipe that was removed from the on-site pipe. (See Figure 16.)
Figure 16
(17A) Mount four-way valve (21S4a) to the pipe below four-way valve (21S4a) and on the back. A total of four areas require
brazing, including the area indicated in (16A) and the areas indicated in Figure 17.
Figure 17
82
- chapter 8
Pipe diameter: φ19.05
ID of the pipe with an extended end: φ19.05
Cut the pipe here.
Severed pipe
Front view
Cut the pipe with an expanded end that is included
with four-way valve (21S4a) 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.
Replace the old one with the one
included with four-way valve
(21S4a).
90°
Set the pipe in the back so that the
pipe connected to the elbow is at
90° against the horizontal plane.
BS_08_E