High Pressure Protection Control - Daikin RZQG71~140L7V1B Service Manual

Function Details

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
Abnormal stop (E3 indication)
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.
108
(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
A Hz
B 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
RZQG71L
118.5 Hz
57 Hz
Normal
(
• Hp-Lp > 0.59 MPa
&
• Hp < 3.33 MPa
(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)
RZQG100-140L
94,5 Hz
94,5 Hz
• Hp-Lp > 0.69 MPa
( ( (
•& (
• Hp < 3.24 MPa
• &
• Outdoor unit fan = 8 step
• OR
OR
• Hp < 2.75 MPa
• Lp < 0.12 MPa
Outdoor unit fan
+1 step/30 sec.
Function and Control
ESIE12-06
15 times or less
stopping in 300
minutes