1 - 13
Mini VRF SYSTEM
Control Functions - Outdoor unit
1
4. Outdoor Unit Fan Control
5. Outdoor Unit Fan Control
2WAY VRF SYSTEM
Control Functions
(1) Number of Fan Motor
These outdoor units utilize a DC fan motor that can be controlled in 0
〜
15 steps (0
〜
15 modes) in ordinary mode.
The control range is expanded to a maximum of 15 steps (15 modes) if high static-pressure mode has been set.
The fan rotating numbers will be changed according to the fan steps.
(2) Fan Step
These outdoor units utilize a DC fan motor that can be controlled in a maximum of 15 steps (15 modes).
However, fan modes 15 can only be used if high static pressure mode or high efficiency mode has been set.
* For information concerning EEPROM settings, refer to the field application functions.
Maximum value
Minimum value
Standard
High static pressure
mode setting
High efficiency mode
setting
Condenser
Condenser
Condenser
Evaporator
Evaporator
Evaporator
Ambient temperature ≥ 38°C
Ambient temperature < 38°C
Ambient temperature ≥ 3
Ambient temperature < 3
Status of heat
exchanger
5HP
4HP
6HP
12
11
12
11
10
11
12
11
12
14
14
14
13
13
13
15
15
15
13
12
13
15
15
15
1
1
1
(3) Minimum Fan Step and Maximum Fan Step
Type of outdoor unit
Number of fan motor
4, 5, 6 HP
1
2WAY VRF SYSTEM
Control Functions
5. Outdoor Unit Fan Control
(4) Fixed Initial Fan Step
For the first 30 seconds after operation starts, the mode is fixed at the initial mode which was calculated from
the relationship between the outdoor air temperature and the outdoor unit horsepower.
If the outdoor unit horsepower (compressor capacity) changes dramatically, the initial mode may be
recalculated and may be again fixed for 30 seconds.
(5) Operation after Fixed Initial Fan Step
After the fixed initial fan step, the fan step is increased or decreased according to the operating conditions.
5-1. Cooling operation
* The fan step is always increased when the detected high pressure sensor temperature is 46°C or higher.
Fan step is increased when the detected high pressure saturated temperature is high, and is decreased when
the high pressure saturated temperature is low.
The fan step may be decreased when the system detects refrigerant shortage at an indoor unit.
During cooling operation, if the fan step becomes “0” and this condition maintains for 3 minutes, the fan step
is changed to “1”.
5-2. When all indoor units are operating in heating mode
If the pressure sensor temperature is low, the fan step is increased at regular intervals.
If the pressure sensor temperature is high, the fan step is decreased in order to prevent excessive loads.
The fan step may be increased when the liquid temperature of outdoor unit heat exchanger drops to 1 degrees
Celsius or below.
Selecting the silent mode results in operation that gives priority to reducing noise at the outdoor unit.
When the setting is in silent mode, the outdoor fan step and the maximum frequency is limited.
So the capacity will be decreased. However, the frequency is not limited during the special controls.
Maximum fan step & maximum frequency in silent mode
Type of outdoor unit
Silent effect
-3dB mode
-1.5dB mode
-7dB mode
-5dB mode
Fan step
Compressor frequency (Hz)
Fan step
Compressor frequency (Hz)
Fan step
Compressor frequency (Hz)
6HP
Heating
Cooling
58.2
6
55.0
6
53.4
Heating
64.6
9
48.6
8
48.6
4HP
Cooling
7
10
Heating
64.6
9
48.6
8
48.6
5HP
Cooling
51.8
10
8
Fan step
Compressor frequency (Hz)
95.0
95.0
48.6
8
48.6
7
43.8
10
63.0
11
10
12
43.8
8
7
43.8
6
43.8
63.0
9
79.0
79.0
13
10
6
51.8
6
48.6
(6) Silent Mode
SM830258-01_欧州向け_1fan_mini_VRF.indb 13
18/03/06 9:09:49
Summary of Contents for S-22ML1E5
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