Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 358

[8-13 Parts Replacement Instructions (Outdoor Unit) ]
(17) Re-place the four-way valves (21S4a and 21S4b) that were removed in step (14). Figure 17-1 shows how to position a
new four-way valves.
Replace the center pipe below four-way valves (21S4a and 21S4b). (3 areas to remove braze from. 2 areas to be brazed.
See Figure 17-2.)
Four-way valve
21S4a
When seen from above, four-way
valves 21S4a and 21S4b are tilted
15°
by 15°.
Figure 17-1
(18) To make it easier to connect four-way valves (21S4a and 21S4b), cut the pipes above four-way valves (21S4a and 21S4b)
with a pipe cutter. Cut the pipe with an expanded end that is included with the check valve block assembly to the same
length as the pipe that was removed from the on-site pipe. (See Figure 18.)
Cut the pipe here.
Four-way valve
21S4a
Figure 18
(19) Re-place the check valve block assembly that was replaced in step (16).
Gas-liquid separator A (2 areas to be brazed. 2 screws.
See Figure 19-1.)
Figure 19-1
BS_08_L
Four-way valve 21S4b
Four-way valve (21S4a)
Cut the pipe here.
<S module>
Pipe diameter: φ19.05
ID of the pipe with an
extended end: φ19.05
<L module>
Four-way valve
Pipe diameter: φ19.05
21S4b
ID of the pipe with an
extended end: φ22.2
Severed pipe
Screw position
Area to be brazed
Four-way valve
21S4a
LEV2d
Area to be
brazed
Four-way valve 21S4a and
21S4b assemblies
Figure 17-2
Four-way valve (21S4b)
<S module>
Pipe diameter: φ12.7
ID of the pipe with an
extended end: φ12.7
<L module>
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 the check valve block
assembly 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.
Gas-liquid separator B (3 areas to be brazed. 3 screws.
See Figure 19-2.)
Area to be brazed
Figure 19-2
Four-way valve 21S4b
Remove the pipe
that was cut in
step (14).
Replace the pipe that was cut
in step (14) with the pipe
included with the check valve
block assembly.
Pipe cover installation position
(Included with the check valve block)
Screw position
Area to be brazed
Screw position
chapter 8 -
91