Panasonic Urban Multi MX1R Series, Service Manual, Page: 64 / 643

PACD011001C2 Function
Function Urban Multi “MX1, ME1 Series” Using R-22 43
Discharge Super
Heating (DSH)
Control (DSH = Td - high pressure condensation saturation temperature)
During both the inverter and standard compressors are running, when the injection valve for either one
goes OFF and discharge super heating (DSH) continues for 10 minutes at temperature difference of less
than 10°C, the istandard compressor are controlled at 76 Hz or less+OFF for 3 minutes.
Control According
to Outdoor
Temperature
If the outdoor temperature exceeds 27°C when heating, forced thermostat OFF is carried out in order to
prevent a safety device from being tripped or a sensor malfunction.
1.13.2 ME1 Series
High Pressure (Hp) Control
Low Pressure (Lp) Control
Discharge Pipe Temperature (Td) Control
Inverter Current Control
Hp
≥
21.3kg/cm²
(2.087MPa)
Hp
≥
23.0kg/cm²
(2.254MPa)
Hp>25.0kg/cm²
(2.450MPa)
Hp>27.5kg/cm²
(2.695MPa)
Heat exchanger
capacity control 76Hz+OFF
Forced thermostat OFF
Up to 2 times
in 30 minutes E3 stop due
to malfunction
(VF001)
Lp>2.0kg/cm²
(0.196MPa)
DSH>15˚C
&
Lp<1.2kg/cm²
(0.118MPa)
LP<0.8
R1T>5ºC
LP<0.5
R1T
≤
5ºC
Lp<0.3kg/cm²
(0.029MPa)
Lp<0kg/cm²
(0MPa)
(Cooling)
30Hz+OFF
(Heating, simultaneous cool / heat operation)
Hot gas bypass
valve ON
106Hz+OFF
or
60Hz+ON
Injection valve ON
Lp<1.7kg/cm²
(0.167MPa)
Forced thermostat
OFF
Up to 2 times
in 30 minutes
E4 stop due
to malfunction
Hot gas bypass
valve ON
(VF002)
&
&
or
LP<0.8
R5T<Te + 10ºC
LP<0.5
R5T
≥
Te + 10ºC
&
&
or
Td
≥
130˚C
Td>105˚C
or
DSH>55˚C (DSH = Discharge Super Heating)
or
Td>90˚C&Lp<3kg/cm² (Control during cooling)
or (0.294MPa)
Td>90˚C&Lp<1.0kg/cm²
or (0.098MPa)
(Injection solenoid valve ON)
u
38Hz+OFF : Both high
u
106Hz+OFF(-): STD only high
u
38Hz+ON(-): INV only high
Td>135˚C
Forced thermostat OFF
Up to 2 times
in 100 minutes
Td
≥
135˚C
F3 stop due
to malfunction
(VF005)
( ) Control during heating
&
Simultaneous
cool / heat operation
INV
≥
15.0A(Y1)
FREQUENCY
1 STEP DOWN
L8 stop due
to malfunction
INV
≥
15.0A(Y1)
Forced thermostat OFF
UP to 4 times in 60 minutes
(VF004)