Outdoor Fan Control - Panasonic U-4LE1E5 Service Manual

7. Outdoor Fan Control

7-1. Outdoor Fan (Min. Fan Mode and Max. Fan Mode)
These outdoor units utilize a DC fan motor that can be controlled using a maximum of 15 increments (15 fan
modes).
Outdoor unit
Cooling operation
Heating operation
7-2. Fixed Initial Fan Mode
For the first 30 seconds after operation starts, the mode is fixed at the initial mode that was calculated based on
the relationship between the outdoor air temperature and the outdoor unit horsepower.
If the outdoor unit horsepower changes dramatically, the initial mode may be recalculated and may be again fixed
for 30 seconds.
7-3. Operation after initial fan mode is fixed
After the fixed initial fan mode, the fan mode is increased or decreased according to the operating conditions.
(1) Indoor cooling operation
(a) The fan mode is increased when the pressure sensor temperature is high, and is decreased when the
pressure sensor temperature is low.
* The fan mode is always increased when the pressure sensor temperature is 50°C or higher.
(b) The fan mode may be decreased when symptoms of insufficient gas are detected at an indoor unit.
(2) Indoor heating operation
If the condensation temperature is low, the fan mode is increased at regular intervals.
(a)
(b) If the condensation temperature is high, the fan mode is decreased in order to prevent excessive load.
(c) The fan mode may be increased when the outdoor liquid temperature drops to 7°C or below.
7-4. When Compressor Magnet Switch Seizing Alarm Occurs
Because the high pressure may increase, operation occurs at the maximum fan mode.
• Quiet mode operation
For the setting procedure, refer to the separate instructions. When Quiet mode is activated, the maximum fan
mode is reduced compared to maximum fan mode during normal operation.
Outdoor unit
Cooling operation
Heating operation
* However, during cooling operation if the outdoor air temperature is 30°C or higher, the maximum fan mode
is 14.
7-5. Silent Mode
Selecting the silent mode results in operation that gives priority to reducing noise, because these modes involve
restrictions on outdoor unit fan modes, the capacity will be somewhat reduced.
To activate this function, it is necessary to set it to EEPROM in outdoor unit and short circuiting "SILENT" pins.
CODE: 05
Setting No.
0 Invalidity (Factory preset mode)
1 Silent mode
2 Never use
3 Never use
Min. fan mode
Outdoor air temp. > 36°C: 3
Outdoor air temp. 36°C: 1
1
Max. fan mode
4 hp 5, 6 hp
11 12 (*14)
11
10
Description
Max. fan mode
4 hp 5, 6 hp 4 hp
14 14 11
13 14 10
1 - 13
Mini VRF SYSTEM
Control Functions
Silent mode
5 hp 6 hp
12 12
11 11
1