Panasonic LZ2 - Page 37

1 - 13
Mini VRF SYSTEM
Control Functions - Outdoor unit
1
4. Outdoor Unit Fan Control
2WAY VRF SYSTEM
Control Functions
5. Outdoor Unit Fan Control
(4) Fixed Initial Fan Step
For the first 30 seconds after operation starts, the spep 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. Heating operation
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
-7dB mode
-5dB mode
Fan step
Compressor frequency (Hz)
Fan step
Compressor frequency (Hz)
Fan step
Compressor frequency (Hz)
10HP
Heating
62.0
11
62.0
10
62.0
Cooling
60.2
11
54.9
10
44.2
Heating
68.3
11
68.3
10
68.3
8HP
Cooling
60.2
12 12 1211
50dB mode
Fan step
Compressor frequency (Hz) 34.4 34.4 34.434.4
5555
10
60.2
9
60.2
(6) Silent Mode
5. Outdoor Unit Fan Control
2WAY VRF SYSTEM
Control Functions
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 (Factory preset mode)
Capacity is given priority
Setting No.
0
1
2
3
4
5
6
7
8
Capacity is given priority
Capacity is given priority
Capacity 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
Silent effect
50dB
Necessary
Necessary
Necessary
-3dB
-5dB
50dB
Unnecessary
Unnecessary
Unnecessary
-3dB
-5dB
-7dB
-7dB
-7dB
-7dB
NOTE
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
In case of selecting silent priority mode (more than “9” setting) in high load situation, the system has
possibility to stop to prevent high pressure cut.
Silent is given priority9
10
11
12
13
14
15
16
Silent is given priority
Silent is given priority
Silent is given priority
Silent is given priority
Silent is given priority
Silent is given priority
Silent is given priority
Necessary
Unnecessary
50dB
Necessary
Necessary
Necessary
-3dB
-5dB
50dB
Unnecessary
Unnecessary
Unnecessary
-3dB
-5dB
CODE: 78
Input by indoor unit remote controller
Invalid (Factory preset mode)
Valid
Setting No.
0
1
When the setting is “external input necessary”, this function works in either of the following way
1
short circuiting "SILENT” plug on the PCB.
2
-1 Change setting the outdoor unit EEPROM CODE: 78 to “01”.
2
-2 When setting in Quiet operation by the indoor unit address 1 remote controller (CZ-RTC5B):
*Regarding the method of setting Quiet operation, see the Operating Instructions provided with the
remote controller.
SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 13SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 13 2021/05/07 10:10:272021/05/07 10:10:27