SiBE281013
Function Details
Function and Control
39
3.2.12 High Pressure Protection Control
In order to prevent abnormal high pressures in the system and hence avoiding activation of the
high pressure safety device the below control function will be activated.
As the bearing resistance limit pressure decreases during slow operation of the compressor, the
lower limit of frequency is restricted.
3.2.13 Heating Control at High Outdoor Air Temperature
Under the condition of heating overload, control the outdoor unit fan in order to secure the
difference of elevation pressure and the pressure ratio of the compressor.
(Cooling)
(Heating)
Normal operation
Hp > 3.57 MPa
Hp < 3.42 MPa
Hp > 3.53 MPa
Hp < 3.52 MPa
Hp < 3.42 MPa
Hp > 3.67 MPa
Compressor operation
frequency –1 step/10 sec.
Compressor operation
fre1 step/1 min.
Normal operation
Compressor operation
frequency B Hz
Compressor stop
Abnormal stop (E3 indication)
Compressor operation
fre1 step/5 min.
Compressor operation
frequency A Hz
Compressor stop
Abnormal stop (E3 indication)
OR
• HPS activates
• Hp > 3.92 MPa
for 1 minute
• Hp < 3.24 MPa
• 30 sec elapsed
15 times or less
stopping in 300
minutes
• Hp > 3.92 MPa
• HPS activates
• Stopped 16 times in
300 minutes
• Stopped 16 times
in 300 minutes
&
OR
RZQG71LV1B
RZQG100-140LV1B
A Hz
118.5 Hz
52 Hz
B Hz
57 Hz
52 Hz
C MPa
3.04 MPa
2.70 MPa
D MPa
2.84 MPa
2.60 MPa
E Hz
57 Hz
40 Hz
Hp
≥
C MPa
[In cooling/heating operation]
Normal operation
Hp
≤
D MPa
After 30 seconds
Compressor frequency lower limit
E Hz
Normal
• Hp-Lp < 0.39 MPa
• Hp > 3.43 MPa
OR
&
• &
• Hp < 2.75 MPa
OR
• Hp-Lp > 0.69 MPa
• OR
•&
• Lp < 0.12 MPa
(
(
(
(
(
(
Outdoor unit fan
-1 step/30 sec.
Outdoor unit fan
+1 step/30 sec.
• Hp-Lp > 0.59 MPa
• Hp < 3.33 MPa
• Hp < 3.24 MPa
• Outdoor unit fan = 8 step
