Mitsubishi Electric PUHY-HP72 Service Handbook page 254

[8-12 Parts Replacement Instructions ]
(13A) Remove four-way valve (21S4a) by removing the braze from the area above four-way valve (21S4a) as shown in Figure
13.
Figure 13
(14A) Mount a new four-way valve (21S4a). Figure 14 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 14
(15A) 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 15.)
Figure 15
(16A) 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 (15A) and the areas indicated in Figure 16.
Figure 16
HWE18240_GB
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.
57
chapter 8 -