Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 342

[8-13 Parts Replacement Instructions ]
4. XL-module (four-way valve (21S4a, 21S4b, and 21S4c))
Explained below is the procedure for replacing four-way valve (21S4a) (in the center when seen from the front of the unit),
four-way valve (21S4b) (on the right when seen from the front of the unit), and four-way valve (21S4c) (on the left when seen
from the front of the unit). (See Figure 1.)
Figure 1
(1) Remove the wiring and sheet metal. (Screwed down with four screws) (See Figure 2.)
Figure 2
(2) Remove the coil (four-way valves (21S4a, 21S4b, and 21S4c), and solenoid valve (SV2)), coil cover, and wiring. (See
Figure 3.)
Figure 3
BS_08_E
Four-way valve coil C
Solenoid valve (SV2) coil, and coil cover
Four-way valve coil B
Four-way valve coil A
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