Mitsubishi Electric City Multi CMH-WM250V-A, Руководство по обслуживанию

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[8-13 Parts Replacement Instructions ]
84
- chapter 8 BS_08_E
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2. S, L-module (four-way valve (21S4b))
(23B) To make it easier to connect four-way valve (21S4b), 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
(21S4b) to the same length as the pipe that was removed from the on-site pipe. (See Figure 22.)
(20B) Follow the same procedures ((1) through (8), (9A), and (12A)) for replacing four-way valve (21S4a).
(21B) Remove the pipe below four-way valve (21S4b) and on the front by removing the braze at the two areas shown in
Figure 20.
(22B) Remove four-way valve (21S4b) by removing the braze from the area above four-way valve (21S4b) as shown in Figure
21.
Explained below is the procedure for replacing four-way valve (21S4b) (on the left when seen from the front of the unit).
Secure sufficient work space before starting maintenance work. (See 8-13-1 Ensuring Maintenance Space (Preparation for the
Maintenance of Refrigerant Circuit Parts).)
Remove the rubber spacer.
Figure 20
Figure 21
Figure 22
Severed pipe
Pipe diameter: φ12.7
ID of the pipe with an extended end: φ12.7
Cut the pipe here.
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.
*The included pipe with an expanded end is 100
mm long. Cut it to the appropriate length.
After being removed, leave the pipes at the bottom
inside the unit.
(Once removed from the unit, it will be difficult to
re-place the pipes.)
A cap for sealing the refrigerant pipe
is included with four-way valve
(21S4b).
Replace the old cap with the one
included with the four-way valve.
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