Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 144

SCM-HG (4 room)
3 When the decision frequency becomes 0 Hz when high pressure cut protection control is in operation.
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 1]
Solenoid valve
(SVA, B, C, D)
[Operating → Stopped units 2]
Solenoid valve
(SVA, B, C, D)
[Operating → Stopped units 3]
Solenoid valve
(SVA, B, C, D)
[Stopped units]
Expansion valve
(EVA, B, C, D)
[Operating → Stopped units 1]
Expansion valve
(EVA, B, C, D)
[Operating → Stopped units 2]
Expansion valve
(EVA, B, C, D)
[Operating → Stopped units 3]
Expansion valve
(EVA, B, C, D)
[Stopped units]
3) This is only for 1 or 2 units when 3 are in operation. In addition, the high pressure cut protection control operates when
the serial signal from the indoor unit has stopped (interruption of power supply or signal wire).
4) If a protection function is activated during the operation of the high pressure cut protection control, the protection
function has priority.
142
0 Hz command 1
Calculated Hz
0 Hz
Calculated Hz
0 Hz
Calculated Hz
0 Hz
Decision frequency
16 Hz
0 Hz
Decision frequency
According to 16 Hz
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
All Opened
According to Hz
75 pulses
All closed
All opened
According to Hz
According to 16 Hz
All closed
All opened
According to Hz
According to 16 Hz
All closed
All opened
75 pulses
All closed
Description of operation
0 Hz command 2 0 Hz command 3
2 minutes
2 minutes
2 minutes 2 minutes
2 minutes
2 minutes
2 minutes 55 seconds
2 minutes
2 minutes 25 seconds
2 minutes 25 seconds
55 seconds
55 seconds
55 seconds
55 seconds