Mitsubishi Electric PUHY-HP120TNU-A, Service Handbook

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[8-12 Parts Replacement Instructions ]
HWE18240_GB chapter 8 -
57
8 Troubleshooting Based on Observed Symptoms
(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.)
(13A) Remove four-way valve (21S4a) by removing the braze from the area above four-way valve (21S4a) as shown in Figure
13.
(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
Front view
90°
Cut the pipe here.
Severed pipe
Pipe diameter: φ19.05
ID of the pipe with an extended end: φ19.05
Figure 15
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.
Replace the old one with the one
included with four-way valve
(21S4a).
Set the pipe in the back so that the
pipe connected to the elbow is at
90° against the horizontal plane.
*The included pipe with an expanded end is 100 mm
long. Cut it to the appropriate length.
(14A) Mount a new four-way valve (21S4a). Figure 14 shows how to position a new four-way valve.
Figure 13
15°
When seen from above, four-way valves (21S4a and 21S4b) are tilted by 15°.
Figure 14