Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 30

5. Outdoor Unit CCU (command controller
6. Outdoor Unit CCU (command controller unit) Control
unit) Control
* Operating time "XX" under the section "(4) Drain Pump Control" described on previous page is able to set
in EEPROM of the main outdoor unit.
EEPROM setting in main outdoor unit
CODE: 2B
Setting No.
20
1
30
40
50
60
* The drain pump always operates when the indoor unit is thermostat ON in cooling operation.
* Once the drain pump operates, it keeps operating for 20 minutes.
In the above 2 cases, the drain pump operates by the signal of indoor PCB, not by the CCU.
(5) Discharge Air Temperature Control
For Type F2 and M1 indoor units, discharge air temperature is controlled from the CCU to prevent
dew condensation on duct surface in cooling operation.
It is able to use this function on cassette models but have to change the parameter in indoor unit.
The CCU monitors and adjusts To of indoor unit.
The adjustment is made by compressor capacity and MOV operation in the indoor unit.
To : Cooling (Discharge air temperature) - (Preset discharge air temperature)
Heating (Preset discharge air temperature) - (Discharge air temperature)
Situation in which indoor unit thermostat OFF by discharge air temperature control
To ≤ - 3.5 degrees Celsius, and this condition continues for 7 minutes
To < - 2.0 degrees Celsius, and this condition continues for (20 + XX) minutes
* The above mentioned "XX" is able to set in EEPROM of the main outdoor unit.
EEPROM setting in main outdoor unit
CODE: E1
Setting No.
-20
-19
-18
...
0
...
10
* Regarding the preset discharge air temperature that is set in the indoor unit is able to change,
see the section "5. REMOTE CONTROLLER FUNCTIONS" in this Service Manual.
XX
20 (minutes)
30 (minutes)
(factory preset mode)
40 (minutes)
50 (minutes)
60 (minutes)
XX
-20 (minutes)
-19 (minutes)
-18 (minutes)
...
0 (minutes)
(factory preset mode)
...
10 (minutes)
Control Functions - Outdoor unit
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2WAY VRF SYSTEM
Mini VRF SYSTEM
Control Functions