1 - 7
Mini VRF SYSTEM
Control Functions - Outdoor unit
1
2. Compressor Control
2WAY VRF SYSTEM
Control Functions
3. Compressor Control
PX=60.5 PX=60.5
60.4
56.1
56.0
53.9
Thermostat
OFF
Horsepower
decrease
Horsepower
increase
prohibited
Horsepower
increase
possible
Area D
Area C
Area B
Area A
54.0
°C °C
60.4
50.0
47.9
Thermostat
OFF
Horsepower
decrease
Horsepower
increase
prohibited
Horsepower
increase
possible
Area D
Area C
Area B
Area A
50.1
48.0
50.0
15 300
48.0
40.5
34.0
33.0
°C
Max. required level
42.0
4-2. Condensation Temperature Control
Target temperature of the Area B is different between cooling and heating operation.
In Cooling Mode
The purpose of this control at cooling
is to prevent abnormal high-pressure.
1
In Heating Mode
Heating capacity is adjusted with this control.
It also prevents abnormal high-pressure simultaneously.
The capacity is controlled in the following diagram.
2
3. Compressor Control
2WAY VRF SYSTEM
Control Functions
* Discharge temperature that is used for this control is the highest temperature among all compressors.
When the temperature falls in the Area D (over PX temperature), the operation stops within 0 to
30 seconds at the interval of the roadmap control.
After Tc falls in the Area D and the thermostat is turned OFF, the system may resume operating
from the lower compressor capacity.
Test Run
Test run mode in heating operation is used when the room temperature is high and the indoor unit
thermostat is not turned ON. This mode is used for operation check when the outdoor unit is fully
operated or additional refrigerant charge without stopping the system.
When the system operates in a minimum capacity, the system will continue operating for at least
6 minutes if the condensation temperature area is the Area C.
If it maintains in the Area C, the thermostat may turn OFF.
Once the indoor unit is selected for the test run, the thermostat will not be turned OFF.
However, condensation temperature control is performed in order to prevent the high load
according to the figure shown on previous page.
After the last indoor unit is operated in the test run mode, the test run is automatically cancelled
after 1 hour.
4-3. Protection Control
P03 trip
Capacity goes down
Horsepower cannot increase
Horsepower can increase
Compressor discharge temperature protection
The compressor capacity is controlled according to the figure below.
1
Low pressure protection control
In order to prevent the excessive decrease of low pressure, the compressor capacity is controlled
according to the figure below.
2
106
99
95
°C
No restriction
Capacity goes up slowly
0.25
0.20
Capacity cannot increase
Capacity goes down
H06 trip (Continuous for 2 minutes)
0.17
0.06
H06 trip0.02
Low pressure
MPa
SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 7SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 7 2021/05/07 10:10:262021/05/07 10:10:26
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