Daikin FXYBP20K7V1, Service Manual

Page: 58 / 193

SiE 00-07 Outline of Control (Outdoor Unit)
Function R-407C PLUS Series 47
3.4 Low Outside Temperature Cooling Control
Controls the outdoor unit fans and compressors to prevent refrigerant circulation from decreasing due to
lowering of high pressure and to maintain high pressure when the outside temperature is low during
cooling operation.
Fan
Compressor
16/18/20 class
H+ON/H+ON
Normal operation
24/26/28/30 class
H+ON+ON
+ON/H+ON
HP < 1.05 MPa
continues for 30 sec HP > 1.55 MPa
continues for 30 sec
Condition A
Fan
Compressor
16/18/20 class
H+OFF/H+OFF
Upper limit 71 Hz
+OFF
24/26/28/30 class
H+OFF+ON
+OFF/H+OFF
Upper limit 52 Hz
+ON+OFF
HP < 1.05 MPa
continues for 30 sec HP > 1.55 MPa
continues for 30 sec
Condition A
(V0819)
(Constant Te control)
HP > 2.16MPa
(Constant Te control)
However, decrease
the target temp. for 5˚C
HP > 2.16MPa
(Constant Te control)
However, decrease
the target temp. for 5˚C
HP > 2.16MPa
HP > 2.16MPa
Condition A
• HP < 0.78 MPa
• Ta < 5˚C
(Outdoor air temp.)
HP > 2.16MPa
Step 1-1
Fan
Compressor
16/18/20 class
H+OFF/OFF+OFF
Upper limit 71 Hz
+OFF
24/26/28/30 class
H+OFF+OFF
+OFF/OFF+OFF
Upper limit 52 Hz
+ON+OFF
HP < 1.05 MPa
continues for 30 sec HP > 1.55 MPa
continues for 30 sec
Condition A
Step 1-2
Fan
Compressor
16/18/20 class
L+OFF/OFF+OFF
41~71 Hz+OFF
24/26/28/30 class
L+OFF+OFF
+OFF/OFF+OFF
41~ 52 Hz
+ON(OFF)+OFF
HP > 1.7 MPa
Condition A
Step 1-3
Fan
Compressor
16/18/20 class
L+OFF/OFF+OFF
Upper limit 41 Hz
+OFF
24/26/28/30 class
L+OFF+OFF
+OFF/OFF+OFF
Upper limit 41 Hz
+OFF+OFF
Condition A
Step 3-1
Fan
Compressor
16/18/20 class
OFF+OFF/
OFF+OFF
Upper limit 41 Hz
+OFF
24/26/28/30 class
OFF+OFF+OFF
+OFF/OFF+OFF
Upper limit 41 Hz
+OFF+OFF
Step 3-2
•
HP < 0.78 MPa
•
TFIN < 67 ˚C
∗
TFIN Inverter fin
temperature
(
&
•
HP > 1.70 MPa
•
TFIN > 87 ˚C
(
OR