Mitsubishi Electric HP120TNU-A Service Handbook page 319

[8-13 Parts Replacement Instructions ]
(17) 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 17.)
Cut the pipe here.
Four-way valve
(21S4a)
Figure 17
(18) Re-place the check valve block assembly that was replaced in step (15). (2 areas to be brazed. 2 screws. See Figure 18.)
Figure 18
78
- chapter 8
Cut the pipe here.
Four-way valve (21S4a)
Pipe diameter: φ19.05
ID of the pipe with an
extended end: φ22.2
Four-way valve
(21S4b)
Severed pipe
Screw position
Area to be brazed
Four-way valve (21S4b)
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.
HWE18220_GB