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2WAY SYSTEM
Control Functions - Outdoor unit
1
5. Outdoor Unit Fan Control
5. Outdoor Unit Fan Control
2WAY VRF SYSTEM
Control Functions
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 mode and the maximum frequency is limited.
So the capacity will be decreased. However, the frequency is not limited during the special controls.
The system entirely becomes to the silent mode by setting in the main outdoor unit.
EEPROM setting in main outdoor unit
CODE : 05
Mode
Invalidity (at factory shipment)
Silent is given priority
Setting No.
0
1
2
3
4
5
6
7
8
Silent is given priority
Silent is given priority
Silent is given priority
Capacity is given priority
Capacity is given priority
Capacity is given priority
Capacity is given priority
External input to PCB
Necessary
Unnecessary
Necessary
Unnecessary
Silent effect
-3dB
Necessary
-5dB
-3dB
Unnecessary
-5dB
-3dB
Necessary
-5dB
-3dB
Unnecessary
-5dB
NOTE
When the setting is “external input to PCB necessary”, this function works by short circuiting “SILENT” plug
on the PCB.
Maximum fan mode & maximum frequency in silent mode
When the setting is “external input to PCB unnecessary”, this function always works.
When the setting is “Capacity is given priority”, this function is interrupted in the following conditions.
Cooling operation: Ambient temperature ≥ 38°C
Heating operation: Ambient temperature ≤ 2°C
* Use the ambient temperature at the outdoor unit in which the first priority order of compressor is mounted.
Type of outdoor unit
Silent effect
-3dB mode
-5dB mode
Fan mode
Compressor 1
frequency (Hz)
Compressor 2
frequency (Hz)
Fan mode
Compressor 1
frequency (Hz)
Compressor 2
frequency (Hz)
10HP
10
44.4
-
9
44.4
-
12HP
9
66.5
-
8
61.8
-
14HP
9
41.0
46.0
8
41.0
46.0
16HP
9
48.1
53.1
9
46.5
51.5
18HP
11
58.6
53.6
10
58.6
53.6
20HP
11
68.1
63.1
10
68.1
63.1
8HP
7
44.4
-
7
40.5
-
(6) Silent Mode
(7) High Static Pressure Mode
The outdoor unit allows a high static pressure mode to operate by changing the outdoor unit EEPROM settings.
This mode is only available for 8HP,10HP and 18HP units. However, it is impossible to install the units solely
for 12HP, 14HP, 16HP and 20HP.
EEPROM setting in each outdoor unit
CODE: 8F
High static pressure mode
Remark
Invalid
at factory shipment
Valid
Setting No.
0
1
2WAY VRF SYSTEM
Control Functions
5. Outdoor Unit Fan Control
(8) Snow Removal Control
Independent control of outdoor unit
This control is intended to prevent snow from accumulating on stopped fans.
The fan motor rotates at 500rpm in the below conditions even if the outdoor unit stops.
8-1.
Control with snow detection sensor (field supply)
If a snow detection sensor (field supply) is available and this function is set in validity, the fan motor of the
outdoor unit rotates at 600 rpm when the snow detection sensor detects snow.
The judgment of this control performs at 10 minutes interval.
One snow detection sensor can control all outdoor units on the communications wiring.
The snow detection sensor is only possible to connect to the main outdoor unit (unit No.1) and it can control
all outdoor units in communication wiring.
8-2.
Fan motor operates for 45 seconds and stops for 2 hours when ambient temperature is 5.1°C or more.
Fan motor operates for 45 seconds and stops for 1.5 hours when ambient temperature is 0.1 - 5.0°C.
Fan motor operates for 45 seconds and stops for 1 hour when ambient temperature is 0.0°C or less.
EEPROM setting in each main outdoor unit
* All outdoor units are connected with same communication wiring.
To activate this function, it is necessary to set it to the EEPROM on each system’s main outdoor unit PCB.
CODE: 04
System address 1
Snow detection sensor installed
Unit No.
1
Unit No.
1
Unit No.
1
Unit No.
2
Unit No.
2
Unit No.
2
Unit No.
3
Unit No.
3
Unit No.
3
System address 2
System address 3
Function
No snow detection sensor is connected but control is available. (at factory shipment)
Snow detection sensor is connected and control is available.
Setting No.
0
1
No snow detection sensor is connected and control is not available.
2
Snow detection sensor is connected but control is not available.
3
Setting No.
Fan motor
status during
snowfall
1
0
0
0
0
0
2
0
0
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
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16/08/26 19:23:17