Panasonic U-8ME1E81 Service Manual page 16

3. Compressor Control
- Heating operation
The heating capacity is adjusted with this control. It also prevents abnormal high-pressure.
Condensation temperature area at heating operation
1
Tc_tgt_max.
Tc_tgt_min.
*PX is usually fixed to 58deg. If the high pressure goes up rapidly after the compressor starts, the system
experiences urgent stop. The next time the system will start with lower PX.
*In the B area, the compressor capacity changes depending on the refrigerant condition.
*When the system operates in a minimum capacity, the system will continue operating for at least 6 minutes if the
condensation temperature area is C area.
*The condensation temperature is not adjusted when there are one or more indoor units that select the test run.
Limit pressure adjustment function
Operation pressure is able to be adjusted for existing old piping.
If area shift function is set, values below shift.
EEPROM setting in main outdoor unit
CODE : 4B
Setting No. Limited pressure
0
1
2
3
deg
Thermostat OFF
Compressor capacity decreases
Compressor capacity holds
Compressor capacity can increase
PX (°C)
3.3MPa 52.5
No use -
3.8MPa 58.0
No use -
C area
B area
A area
Cooling mode
Tc_tgt_min Tc_tgt_max
47.0 49.0
- -
53.0 55.0
- -
1 - 8
2WAY SYSTEM
Control Functions - Outdoor Unit
Heating mode
Tc_tgt_min Tc_tgt_max
47.0 48.0
-
48.0 51.0
-
-
-