Panasonic CU-8ME1XPK - Page 460

PACD011001C2 Outline of Control
Function UM Combination “MA1R Series” Using R-407C 439
[Oil return mode (common for cooling / heating)]
Outdoor unit fan and hot gas bypass solenoid valve (SVP) under oil return operation are controlled not to
actuate high pressure protection. Also outdoor fan is controlled to protect short refrigerant circulation due to
low high pressure during low ambient temperature. (Oil returning is hard at short refrigerant circulation)
Soft startup
Defrost / Oil returnNormal control
Condition
(2)
Condition
(4)
Condition
(1)
Condition
(3)
Step1
Step2
Step3
Step4
Hz Fan SVP SVS EVSVTEV
Indoor unit control
(Command from outdoor unit)Outdoor unit control
33Hz
+OFF
OFF
Normal
control
Thermostat ON · · · 2000pls
Thermostat OFF · · · 224pls
Non-operation unit · · · 224pls
Thermostat ON · · · Normal control
Thermostat OFF · · · 224pls
Non-operation unit · · · 224pls
Thermostat ON · · · Normal control
Thermostat OFF · · · 224pls
Non-operation unit · · · 224pls
Thermostat ON · · · Normal control
Thermostat OFF · · · Normal control
Non-operation unit · · · Normal control
PI control when
SHS = 15
PI control when
SHS = 10
PI control when
SHS = 5
PI control when
SHS = 5
Normal
control
Normal
control
Normal
control
OFF
OFF
OFF
ON
ON
ON
ON




33Hz
+OFF
33Hz
+OFF
33Hz
+OFF
Pc < 2.16 MPa (54.8 ˚C) continues for 20 secPc > 2.66 MPa (63.6˚C)
Pc < 1.88 MPa (49.8˚C) continues for 20 sec
Pc < 1.72 MPa (46.4˚C) continues for 20 sec
Pc > 2.05 MPa (52.7˚C)
Pc > 2.15 MPa (57.0˚C)
Forced thermostat
OFF
Malfunction stop
Up to 2 times within 30 min
3.09 MPa
2.81 MPa
(V0824)
SVP : ON
Fan : Step 
HP<1.72MPa
HP>2.16MPa
SVP : OFF
Fan : Step 
HP<1.49MPa
HP>1.79MPa
SVP : OFF
Fan : Step 
(V0825)