Mitsubishi Electric PURY-HP144, Service Handbook

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[8-13 Parts Replacement Instructions ]
72
- chapter 8 HWE18220_GB
8 Troubleshooting Based on Observed Symptoms
Four-way valve (21S4b)
Cut the pipe here.
Four-way valve (21S4b)
Four-way
valve (21S4b)
Figure 18
Figure 19
Figure 20
(18B) To make it easier to connect four-way valve (21S4b), cut the pipe between the section above four-way valve (21S4b) and
the pipe bend 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 18.)
(19B) Mount four-way valve (21S4b) to the pipe below four-way valve (21S4b) and in the middle. A total of five areas require
brazing, including the area indicated in (18B) and the areas indicated in Figure 19. Mount four-way valve (21S4b)
horizontal to four-way valve (21S4a) as shown in (10A).
(20B) Install the pipe below four-way valve (21S4b) and on the front by brazing at the two areas shown in Figure 20.
This step completes the replacement procedure for four-way valve (21S4b). Re-place the components that were removed as
they were.
Severed pipe
Area to be brazed
Area to be brazed
Area to be brazed
Area to be brazed
Pipe diameter: φ19.05
ID of the pipe with an
extended end: φ19.05
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.
Use the parts included with
four-way valve (21S4a).
When installing four-way
valve (21S4b), first braze
the pipe outside the unit
and then install it to the
unit.
Reinstall these pipes.
*The included pipe with an expanded
end is 100 mm long. Cut it to the
appropriate length.
Area to be
brazed