High Pressure Protection Control - Daikin SkyAir GQI-Eco Series Service Manual

SiBE281013

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.
frequency –1 step/10 sec.
OR
• Stopped 16 times
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.
Function and Control
(Cooling)
Normal operation
Hp > 3.57 MPa
Compressor operation
Hp > 3.67 MPa
Compressor operation
frequency A Hz
• HPS activates
Hp < 3.52 MPa
• Hp > 3.92 MPa
for 1 minute
Compressor stop
in 300 minutes
Abnormal stop (E3 indication)
[In cooling/heating operation]
Normal operation
RZQG71LV1B
A Hz
B Hz
C MPa 3.04 MPa
D MPa 2.84 MPa
E Hz
• Hp-Lp < 0.39 MPa
(
OR
• Hp > 3.43 MPa
Outdoor unit fan
-1 step/30 sec.
Hp < 3.42 MPa Hp > 3.53 MPa
Compressor operation
frequency +1 step/1 min.
Hp < 3.42 MPa
Compressor operation
frequency +1 step/5 min.
• Stopped 16 times in
300 minutes
Hp ≥ C MPa
Hp ≤ D MPa
After 30 seconds
118.5 Hz
57 Hz
57 Hz
Normal
OR
• Hp-Lp > 0.59 MPa
(
&
• Hp < 3.33 MPa
Outdoor unit fan
+1 step/30 sec.
(Heating)
Normal operation
• Hp < 3.24 MPa
&
• 30 sec elapsed
Compressor operation
frequency B Hz
• Hp > 3.92 MPa
OR
• HPS activates
Compressor stop
Abnormal stop (E3 indication)
Compressor frequency lower limit
E Hz
RZQG100-140LV1B
52 Hz
52 Hz
2.70 MPa
2.60 MPa
40 Hz
• Hp-Lp > 0.69 MPa
( ( (
•& ( • Hp < 3.24 MPa
• &
• Outdoor unit fan = 8 step
• OR
• Hp < 2.75 MPa
• Lp < 0.12 MPa
Function Details
15 times or less
stopping in 300
minutes
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