5.2.10 Protection control
¿ Pressure ratio increase protection control
The pressure ratio increase protection control is carried out for the whole outdoor units to be connected.
N O T E
1 In the
case of base unit combinations, the control of the figure is carried out for connecting each outdoor unit.
2 In order to carry out this control, the pressure ratio of each outdoor unit is calculated and the maximum value
is used.
Pressure ratio ε = (Pd +0.06) / (Ps +0.06)
Pd: High pressure sensor detected value.
Ps: Low pressure sensor detected value.
A. Normal operation.
B. Forced decrease in frequency (1.0 Hz/s).
C. Not allowing frequency increases (only frequency decreases are
allowed).
¿ High pressure protection control
The high pressure protection control is carried out to prevent the protection device from being activated due to an increase
in high pressure during an anomaly and protect the compressor from excessive high pressure increases.
Operation mode P1 P2 P3
Cooling 3.45 3.40 3.20
Heating / Heat recovery 3.35 3.30 3.10
N O T E
1 In the case of base unit combinations, the control of the figure is carried out for the whole outdoor units to be
connected.
2 In order to carry out this control, the high pressure of each outdoor unit is calculated and the maximum value
is used.
Pd: high pressure sensor detected value.
A. Normal operation.
B. Forced decrease in frequency (1.5 Hz/s).
C. Not allowing frequency increases (only frequency decreases are
allowed).
D. Abnormal stoppage (cause of stoppage d1-13).
(1)
For 2 seconds.
5 Control system
106
SMGB0065 rev. 1 - 12/2010
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