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1
Mini VRF SYSTEM
Control Functions
(1)
*
(2)
(3)
(4)
*
2-1. Compressors Mounted on Outdoor Units
2-2. Compressor Stop Rules
2-3. Roadmap Control
After a compressor stops, it will not start again for a period of 3 minutes (3 minutes forced OFF). However, this
does not apply to the Special Control described later, when operation of the compressor is forcibly stopped as
part of a control operation.
does not apply to the Special Control described later, when operation of the compressor is forcibly stopped as
part of a control operation.
The controls listed below are performed according to the pressure sensor attached to the outdoor unit and
temperature thermistor attached to the indoor / outdoor unit heat exchanger.
temperature thermistor attached to the indoor / outdoor unit heat exchanger.
With roadmap control, the pressure detected by the pressure sensor is converted to saturation temperature
before it is used. The temperature that has been converted to the saturation temperature is called the pres-
sure sensor temperature.
before it is used. The temperature that has been converted to the saturation temperature is called the pres-
sure sensor temperature.
This control is performed every 30 seconds.
In the evaporation temperature control and condensation temperature control shown in Figs. 1 and 2, the tem-
peratures used to judge each area (A, AB, B, and C) may vary depending on the relationships among factors
including the difference between the room temperature setting and the indoor unit air intake temperature (= air
intake temperature difference) and the difference between the air discharge temperature setting and the air
discharge temperature (= air discharge temperature difference).
peratures used to judge each area (A, AB, B, and C) may vary depending on the relationships among factors
including the difference between the room temperature setting and the indoor unit air intake temperature (= air
intake temperature difference) and the difference between the air discharge temperature setting and the air
discharge temperature (= air discharge temperature difference).
Definitions of the evaporation temperature and condensation temperature
Evaporation temperature (=Te) :
Condensation temperature (=Tc) :
Cooling mode :
Heating mode :
Lowest temperature of the heat exchangers (E1, E3) in all indoor units.
The value used for judgment in Cooling mode and Heating mode is different
depending on the mode.
depending on the mode.
The outdoor unit pressure sensor temperature or the outdoor unit heat
exchanger liquid temperature, whichever temperature is higher.
exchanger liquid temperature, whichever temperature is higher.
The outdoor unit pressure sensor temperature or the indoor unit heat
exchanger temperature (E1) when the heating thermostat is ON, whichever
temperature is higher.
exchanger temperature (E1) when the heating thermostat is ON, whichever
temperature is higher.
The E3 temperature may indicate the temperature of superheated gas. Therefore it is not included for detection
of the condensation temperature (=Tc).
of the condensation temperature (=Tc).
4HP
5HP
6HP
DC Inverter
Compressors mounted
Type
Rotary
Capacity
2. Compressor Control
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1
Mini VRF SYSTEM
Control Functions
Example:
2-3-1. Roadmap control in cooling mode
With this control, the below evaporation temperature control and condensation temperature control are both used.
Control is performed according to the following order of priority:
Control order of priority
Area C > Area B > Area A
When Evaporation temperature control = Area A, and Condensation temperature control = Area C,
then based on the above order or priority, the result is “Area C = Reduce horsepower.”
then based on the above order or priority, the result is “Area C = Reduce horsepower.”
Horsepower increase prohibited
Horsepower increase permitted
Horsepower decrease
(Area A)
(Area B)
(Area C)
5.1°C
5.0°C
5.0°C
2.0°C
1.9°C
1.9°C
(1)
(2)
(3)
(4)
(5)
(6)
Fig. 1-1
For indoor units that are operating in Cooling mode, if one unit is selected for a test run, then the air intake
temperature difference (difference between the room temperature setting and indoor unit air intake tempera-
ture) is ignored, and areas B and C are considered to be area A for control purposes. (This is used for addi-
tional refrigerant charging, test run checks, etc.)
For this reason, vapor may be discharged if the test run continues for a long period of time, however this does
not indicate a problem.In addition, the test run is canceled automatically after 1 hour.
temperature difference (difference between the room temperature setting and indoor unit air intake tempera-
ture) is ignored, and areas B and C are considered to be area A for control purposes. (This is used for addi-
tional refrigerant charging, test run checks, etc.)
For this reason, vapor may be discharged if the test run continues for a long period of time, however this does
not indicate a problem.In addition, the test run is canceled automatically after 1 hour.
Even within the same area, the compressor capacity varies depending on the refrigerant temperature.
For 6 minutes after the compressors start, area C is considered to be area B for control purposes.
During special control, control of the compressor capacity according to Te is not performed.
If the thermostat turns OFF while Te is within area C, the next time the compressor starts it may restart from a
lower capacity.
lower capacity.
When the area changes to area C, area C is considered to be area B for control purposes for the first 6 min-
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.
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.
Horsepower increase prohibited
(Area C)
(Area D)
Horsepower decrease
Horsepower increase permitted
Thermostat OFF
(Area A)
(Area B)
53.5°C
53.4°C
53.4°C
54.6°C
54.5°C
54.5°C
57.5°C
57.4°C
57.4°C
Evaporation temperature (=Te) control
Condensation temperature (=Tc) control
Fig. 1-2
2. Compressor Control
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1
Mini VRF SYSTEM
Control Functions
Horsepower (hp) limits
+2 hp down
+1 hp down
+0.5 hp down
Hp increase prohibited
Hp increase permitted (slowly)
No restriction
105
104
102
99 – Less than 102
96 – Less than 99
Less than 96
The values shown in the table above are reduced to the
values calculated by roadmap control.
values calculated by roadmap control.
Air discharge
temperature level
2-3-2. Roadmap control in heating mode
Roadmap control is performed using the below condensation temperature control.
Horsepower increase prohibited
Horsepower decrease
Horsepower increase permitted
Thermostat OFF
57.5°C
57.4°C
57.4°C
51.6°C
51.5°C
51.5°C
49.0°C
48.9°C
48.9°C
(Area D)
(Area C)
(Area B)
(Area A)
(1)
(2)
(3)
(4)
*
(1)
Condensation temperature (=Tc) control
Fig. 1-3
For indoor units that are operating in Heating mode, if one unit is selected for a test run, the air intake temper-
ature difference is ignored;however, Tc control is performed according to Fig.1-3 in order to prevent excessive
load.(This is used for test run checks, etc.)
ature difference is ignored;however, Tc control is performed according to Fig.1-3 in order to prevent excessive
load.(This is used for test run checks, etc.)
Even within the same area, the compressor capacity varies depending on the refrigerant temperature.
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.
sor starts it may restart from a lower capacity.
When the area changes to area C, area C is considered to be area B for control purposes for the first 6 min-
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.
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.
2-3-3. 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.
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
capacity.
capacity.
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).
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)
2. Compressor Control
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1
Mini VRF SYSTEM
Control Functions
2. Compressor 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.
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.
(3) Secondary Current Protection (Common to cooling & heating mode)
Regardless of the outdoor air temperature, the value of the primary current protection is controlled by the
contents of the table listed below.
contents of the table listed below.
Concept view of outdoor air temperature
Table 1
unit : Amp.
unit : Amp.
unit : Amp.
Single-phase Model
Single-phase Model
3-phase Model
Single-phase Model
3-phase Model
<Cooling>
<Heating>
Stop*1
Down*2
Not up*3
When outdoor air temperature increases :
When outdoor air temperature decreases :
43.0°C
Outdoor air
temperature:
temperature:
Cooling at Table 2
Section of outdoor air temp.
Cooling at Table 1
42.0°C
Outdoor air
temperature:
temperature:
Cooling at Table 2
Section of outdoor air temp.
Cooling at Table 1
Followed by normal control
Table 2
4 hp
20.0~22.0
19.0~20.0
~19.0
22.0~
5 hp
23.0~25.0
22.0~23.0
~22.0
25.0~
6 hp
26.0~28.0
25.0~26.0
~25.0
28.0~
Stop*1
Down*2
Not up*3
Followed by normal control
4 hp
20.0~22.0
19.0~20.0
~19.0
22.0~
5 hp
23.0~25.0
22.0~23.0
~22.0
25.0~
6 hp
24.0~28.0
23.0~24.0
~23.0
28.0~
Stop*1
Down*2
Not up*3
Followed by normal control
4 hp
21.0~23.0
20.0~21.0
~20.0
23.0~
5 hp
24.5~26.5
23.5~24.5
~23.5
26.5~
6 hp
28.0~30.0
27.0~28.0
~27.0
30.0~
hp : horse power
hp : horse power
hp : horse power
unit : Amp.
3-phase Model
Stop*1
Down*2
Not up*3
Followed by normal control
4 hp
8.5~10.5
7.5~8.5
~7.5
10.5~
5 hp
10.0~12.0
9.0~10.0
~9.0
12.0~
6 hp
12.0~14.0
11.0~12.0
~11.0
14.0~
hp : horse power
unit : Amp. hp : horse power
Stop*1
Down*2
Not up*3
Followed by normal control
unit : Amp. hp : horse power
Stop*1
Down*2
Not up*3
Followed by normal control
Common to 4/5/6 hp
21.0~24.0
20.0~21.0
~20.0
24.0~
Common to 4/5/6 hp
15.0~18.0
14.0~15.0
~14.0
18.0~
Each value shown in the table indicates the detected value.
When the detected value is detected as shown in the table :
*1
*2
*3
Stop the compressor.
Decrease the frequency that the compressor is controlled.
Do not increase the frequency that the compressor is
controlled.
controlled.
NOTE
Each value shown in the table indicates the detected value.
When the detected value is detected as shown in the table :
*1
*2
Stop the compressor.
Decrease the frequency that the compressor is controlled.
*3 Do not increase the frequency that the compressor is
controlled.
NOTE
unit : Amp.
Stop*1
Down*2
Not up*3
Followed by normal control
4 hp
8.5~10.5
7.5~8.5
~7.5
10.5~
5 hp
10.0~12.0
9.0~10.0
~9.0
12.0~
6 hp
12.0~14.0
11.0~12.0
~11.0
14.0~
hp : horse power
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