Panasonic U-72MF2U9 Service Manual page 34

6. Outdoor Unit CCU (command controller unit) Control
EEPROM setting in main outdoor unit
CODE: 2B
Setting No.
20
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 CCU.
1
6-5. Discharge Air Temperature Control
For Type F2, M2, E1 indoor units, discharge air temperature is controlled from the CCU to prevent condensation
on duct surface in cooling operation. The CCU monitors and adjusts
by compressor capacity and MOV operation in the indoor unit.
2
* To: Cooling (Discharge air temperature) - (Preset discharge air temperature)
Heating (Preset discharge air temperature) - (Discharge air temperature)
Situation in which indoor unit stops by discharge air temperature control
● To ≤ -6.3deg F (-3.5deg C), and this condition continues 7 minutes
3
● To ≤ -3.6deg F (-2.0deg C), and this condition continues (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
4
Setting No.
-20
-19
-18
5
0
10
6
* Discharge air temperature in cooling mode is 53.6°F (12°C).
* In heating operation, this function virtually does not work because preset discharge air temperature is 122°F
(50°C) and this is sufficiently higher than actual discharge temperature.
For preset discharge air temperature that is set in the indoor unit is able to change, refer to manual for indoor unit.
7
8
9
XX
20 minutes
30 minutes (factory preset mode)
40 minutes
50 minutes
60 minutes
XX
20
21
-18
Interval of "1"
0 (factory preset mode)
10
To of indoor unit. The adjustment is made
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3WAY VRF SYSTEM
Control Functions