Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 201

(e) High pressure cut protection control
The high pressure cut protection operates during heating operations when a "heating 0 rps" serial signal is received from one
of the two operating indoor units.
1 When only one of two operating units sends a "heating 0 rps"signal.
Functional components
Indoor unit
instruction
speed
Actual operating speed
Outdoor unit fan
4-way valve
EEVA
EEVB
2 When decision speed becomes 0 rps during high pressure cut protection control
Functional components
Indoor unit
instruction
speed
Actual operating speed
Outdoor unit fan
4-way valve
EEVA
EEVB
Operation of each functional components
0 rps
instruction
A room
2 min.
Calculated rps
0 rps
Calculated rps
B room
0 rps
Decision rps
According to
outdoor rps
OFF
ON
OFF
According to
outdoor rps
Fully closed
According to
outdoor rps
Operation of each functional components
0 rps instruction
A room
Calculated rps
0 rps
0 rps instruction
B room
Calculated rps
0 rps
Decision rps
0 rps
According to
outdoor rps
OFF
ON
2 min.
OFF
According to
outdoor rps
Fully closed
2 min. 55 sec.
According to
outdoor rps
2 min.
Fully closed
Remarks
Instruction speed from indoor unit
that has "heating 0 rps".
Instruction speed for indoor unit
that has "other than heating 0 rps".
Corresponding expansion valve
58 pulse or
EEV control for unit with serial signal
that has "heating 0 rps".
Corresponding expansion valve
for unit with serial signal that
has "other than heating 0 rps".
Remarks
The sequence for o rps instruction
shows one example.
200 pulse
200 pulse
SCM-HG (2 room)
199