Panasonic U-4LE1E5 Service Manual page 12

(3) If the condensation temperature (Tc) enters area D and the thermostat turns OFF, the next time the compres-
sor starts it may restart from a lower capacity.
(4) When the area changes to area C, area C is considered to be area B for control purposes for the first 6 min-
2. Compressor Control
utes, even if the horsepower is the minimum value within the range where capacity control is possible (opera-
tion with inverter frequency of 25 Hz only). Subsequently if C area continues, the thermostat turns OFF.
2-3-4. Protection control
Protection control consists of 2 types of protection:compressor air discharge temperature protection and current
protection. The limit values from this protection control are incorporated into the output compressor capacity
increase/decrease values that were calculated from roadmap control.
* In some cases, the control shown below may stop the compressor, issue an alarm, or reduce the compressor
1
capacity.
(1) Air discharge temperature protection
The compressor capacity is limited by using the air discharge temperature of the operating compressor (as
shown in the tables below).
(Air discharge temperature level:Highest level among the air discharge temperature levels of all compressors)
Air discharge
temperature level
105
104
102
99 – Less than 102
96 – Less than 99
2. Compressor Control
Less than 96
The values shown in the table above are reduced to the
values calculated by roadmap control.
(2) Primary Current Protection
The primary current protection value is divided into the cooling and heating mode.
Also, the cooling of single-phase outdoor unit can be divided into two tables according to the outdoor air
temperature. 3-phase outdoor unit has no distinction for outdoor air temperature.
Concept view of outdoor air temperature
<Cooling>
Single-phase Model
When outdoor air temperature increases :
Outdoor air
temperature:
43.0°C
Table 1
Stop*1
Down*2
Not up*3
Followed by normal control
3-phase Model
Stop*1
Down*2
Not up*3
Followed by normal control
<Heating>
Regardless of the outdoor air temperature, the value of the primary current protection is controlled by the
contents of the table listed below.
Single-phase Model
Stop*1
Down*2
Not up*3
Followed by normal control
Horsepower (hp) limits
+2 hp down
+1 hp down
+0.5 hp down
Hp increase prohibited
Hp increase permitted (slowly)
No restriction
Section of outdoor air temp.
Cooling at Table 2
Cooling at Table 1
unit : Amp. hp : horsepower
4 hp 5 hp
22.0~ 25.0~
20.0~22.0 23.0~25.0 26.0~28.0
19.0~20.0 22.0~23.0 25.0~26.0
~19.0 ~22.0
unit : Amp. hp : horsepower
4 hp 5 hp
10.5~ 12.0~
8.5~10.5 10.0~12.0 12.0~14.0
7.5~8.5 9.0~10.0 11.0~12.0
~7.5 ~9.0
unit : Amp. hp : horsepower
4 hp 5 hp
23.0~ 26.5~
21.0~23.0 24.5~26.5 28.0~30.0
20.0~21.0 23.5~24.5 27.0~28.0
~20.0 ~23.5
When outdoor air temperature decreases :
Outdoor air
temperature:
42.0°C
Table 2
6 hp
28.0~ Stop*1
Down*2
Not up*3
~25.0 Followed by normal control
6 hp
14.0~
~11.0
6 hp
30.0~
1 - 6
~27.0
Mini VRF SYSTEM
Control Functions
Mini VRF SYSTEM
Control Functions
Section of outdoor air temp.
Cooling at Table 2
Cooling at Table 1
unit : Amp. hp : horsepower
4 hp 5 hp 6 hp
22.0~ 25.0~ 28.0~
20.0~22.0 23.0~25.0 24.0~28.0
19.0~20.0 22.0~23.0 23.0~24.0
~19.0 ~22.0 ~23.0