Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 142

SCM-HG (4 room)
(f) High pressure cut protection control
1) The high pressure cut protection control operates when 1 or 2 units are stopped when heating with multiple units.
2) The operation of functional components is as follows.
1 When 1 unit is stopped from among multiple operating units.
Functional component
Indoor unit command frequency
Outdoor unit frequency
Outdoor unit fan
4-way valve
Solenoid valve
(SVDf)
Solenoid valve
(SVA, B, C, D)
[Operating → Stopped units]
Solenoid valve
(SVA, B, C, D)
[Operating units]
Solenoid valve
(SVA, B, C, D)
[Stopped units]
Expansion valve
(EVA, B, C, D)
[Operating → Stopped units]
Expansion valve
(EVA, B, C, D)
[Operating units]
Expansion valve
(EVA, B, C, D)
[Stopped units]
Note (1) If a stopped unit is restored to operation, transition is made to normal control after refrigerant flow noise reduction control has been implemented.
140
Calculated Hz
0 Hz
Decision frequency
16 Hz
Decision frequency
According to 16 Hz
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
According to Hz
75 pulses
Decision frequency
According to 16 Hz
According to Hz
75 pulses
Description of operation
0 Hz
command
2 minutes