Outdoor Fan Control - Panasonic U-8ME1E8E Service Manual

5. Outdoor Fan Controls
5-1. No. of fan motor
Outdoor unit Capacity 8HP 10HP 12HP 14HP 16HP 18HP 20HP
No. of Fan Motor
5-2. Fan mode
These outdoor units utilize a DC fan motor that can be controlled in a maximum of 15 steps (15 modes).
Fan modes 15 can only be used if high static-pressure mode has been set.
1
5-3. Outdoor Fan Min. Fan Mode and Max. Fan Mode
Cooling operation
Heating operation
* Even if the fan mode is "0" during cooling operation, the fan mode may change to "1" every XX minutes for
cooling the inverter HIC.
EEPROM setting in each outdoor unit
CODE: A5
Setting No
0
1
2
5
9
5-4. Fixed Initial Fan Mode
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.
5-5. Operation after Fixed Initial Fan Mode
After the fixed initial fan mode, the fan mode is increased or decreased according to the operating conditions.
5-5-1. Cooling operation
(A)Fan mode is increased when the detected high pressure sensor temperature is high, and is decreased when
the pressure sensor temperature is low.
* The fan mode is always increased when the detected high pressure sensor temperature is 46°C or higher.
(B)The fan mode may be decreased when the system detects refrigerant shortage at an indoor unit.
(C)If the fan mode becomes 0 during cooling operation and this condition lasts for 5 minutes, the fan mode is
changed to 1.
5-5-2. When all indoor units are operating in heating mode
(A)If the condensation temperature is low, the fan mode is increased at regular intervals.
(B)If the condensation temperature is high, the fan mode is decreased in order to prevent excessive loads.
(C)The fan mode may be increased when the outdoor liquid temperature drops to 7°C or below.
1 1 1
Min. fan mode
Outdoor air temp. > 15°C: 1
Outdoor air temp. ≤ 15°C: 0
1
0
1
2
Interval of "1"
5 (factory preset mode)
9
1 1 2 2
Max. fan mode
14
14
1 - 16
2WAY SYSTEM
Control Functions - Outdoor Unit