Panasonic U-8ME1E81 Service Manual page 15

3. Compressor Control
Evaporation temperature area
6.5
Te_tgt_max.
6.0
Te_tgt_min.
3.0
2.5
*The evaporation temperature area changes depending on the maximum required level of each indoor unit as
shown above.
*C area is regarded as B area for 6 minutes after compressor starts.
*When the system operates in a minimum capacity, the system will continue operating for at least 6 minutes if the
evaporation temperature area is C area.
*The evaporation temperature is not adjusted while specially controlling defrosting and the oil recovery, etc.
*The evaporation temperature is not adjusted when there are one or more indoor units that select the test run.
If one or more indoor units are selected into test run, the system doesn't stop in all states except alarm appearing.
*The test run will finish automatically in about one hour.
3-6-2. Condensation temperature adjustment by roadmap control
Target temperature of the B area is different between cooling and heating operation.
Target lower temperature
(Tc_tgt_min)
Cooling
Heating
-Cooling operation
The purpose of this control at cooling is to prevent abnormal high-pressure.
Condensation temperature area at cooling operation
Tc_tgt_max.
Tc_tgt_min.
deg
Compressor capacity can increase
Compressor capacity
cannot increase
Compressor capacity decreases
Target upper temperature
(Tc_tgt_max)
53.0℃
48.0℃
deg
Thermostat OFF
Compressor capacity decreases
Compressor capacity cannot increase
Compressor capacity can increase
16.0
13.0
A area
B area
C area
0
Max. required level
55.0℃
51.0℃
C area
B area
A area
1 - 7
2WAY SYSTEM
Control Functions-Outdoor Unit
11.0
8.0
6.0
3.0
15 30
1