Panasonic Urban Multi MX1R Series Service Manual page 449

Outline of Control
3.1.4 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.
Condition A
Condition A
• HP < 0.78 MPa
• Ta < 5˚C
(Outdoor air temp.)
Condition A
Condition A
Condition A
Condition A
428
16/18/20 class
Fan
H+ON/H+ON
Compressor
HP < 1.05 MPa
continues for 30 sec
Step 1-1
16/18/20 class
Fan
H+OFF/H+OFF
Upper limit 71 Hz
Compressor
HP < 1.05 MPa
continues for 30 sec
Step 1-2
16/18/20 class
Fan H+OFF/OFF+OFF
Upper limit 71 Hz
Compressor
HP < 1.05 MPa
continues for 30 sec
Step 1-3
16/18/20 class
Fan
L+OFF/OFF+OFF
Compressor
41~71 Hz+OFF
HP > 1.7 MPa
Step 3-1
16/18/20 class
Fan
L+OFF/OFF+OFF
Upper limit 41 Hz
Compressor
( • HP < 0.78 MPa
&
• TFIN < 67 ˚C
∗TFIN Inverter fin
temperature
Step 3-2
16/18/20 class
OFF+OFF/
Fan
OFF+OFF
Upper limit 41 Hz
Compressor
24/26/28/30 class
H+ON+ON
+ON/H+ON
Normal operation
HP > 1.55 MPa
continues for 30 sec
24/26/28/30 class
H+OFF+ON
+OFF/H+OFF
Upper limit 52 Hz
+OFF +ON+OFF
HP > 1.55 MPa
continues for 30 sec
24/26/28/30 class
H+OFF+OFF
+OFF/OFF+OFF
Upper limit 52 Hz
+OFF +ON+OFF
HP > 1.55 MPa
continues for 30 sec
24/26/28/30 class
L+OFF+OFF
+OFF/OFF+OFF
41~ 52 Hz
+ON(OFF)+OFF
24/26/28/30 class
L+OFF+OFF
+OFF/OFF+OFF
Upper limit 41 Hz
+OFF +OFF+OFF
( • HP > 1.70 MPa
OR
• TFIN > 87 ˚C
24/26/28/30 class
OFF+OFF+OFF
+OFF/OFF+OFF
Upper limit 41 Hz
+OFF +OFF+OFF
Function UM Combination "MA1R Series" Using R-407C
PACD011001C2
HP > 2.16MPa
(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
(V0819)