Mitsubishi Electric CITY MULTI PUHY-P200YEM-A Service Handbook page 89

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Check Valves Block PURY-P200·250
The refrigerant flow in the pipe 6, 7, 8 and 9 are depend on ON/OFF of the SV3, 4, 5 and 6.
Please confirm by LED monitor display.
You can open the cap of valve A, B and C, but 3 types of hexagon socket screw keys. The size is as follows.
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Closed torque : A : 0.17N·m
B : 2.0N·m
C : 1.3N·m