Panasonic U-8ME1E8E Service Manual page 15

3. Compressor Control
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
Cooling
Heating
-Cooling operation
1
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.
- Heating operation
The heating capacity is adjusted with this control. It also prevents abnormal high-pressure.
Condensation temperature area at heating operation
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.
Target upper temperature
(Tc_tgt_min)
53.0℃
48.0℃
deg
Thermostat OFF
Compressor capacity decreases
Compressor capacity cannot increase
Compressor capacity can increase
deg
Thermostat OFF
Compressor capacity decreases
Compressor capacity holds
Compressor capacity can increase
(Tc_tgt_max)
55.0℃
51.0℃
C area
B area
A area
C area
B area
A area
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2WAY SYSTEM
Control Functions - Outdoor Unit