Panasonic U-8MF2E8 Service Manual page 33

6. Indoor Units Control from CCU
6-3-2. Dry mode
Indoor unit fan run in the dry mode is controlled from CCU as shown in the below figure.
DTi
+1
DTi = (Intake temperature of indoor unit) - (Preset temperature in remote controller)
6-3-3. Heating mode
Indoor unit fan run in the heating mode is stopped from CCU at the following conditions.
Discharge air temperature of indoor unit < _ 20°C
High pressure sensor temperature (HPS) in outdoor unit < _ 25°C
Liquid temperature (E1) in indoor unit < _ 20°C
6-4. Drain pump control
CCU intervenes in drain pump control of the indoor unit according to the setting in EEPROM in the outdoor unit.
The drain pump operates from CCU control at the following conditions.
> _
DP counter 5
* The DP counter counts Oil Recovery Control and Tube Refrigerant Recovery Control in cooling operation.
Liquid temperature (E1) in the indoor unit which selected cooling mode < 0°C
* Regardless of operating / stopped.
Low Silhouette Ducted type indoor unit
In Low Silhouette Ducted types, dirt might be accumulated when water collects in the drain pan for a long period
of time.
Therefore, the drain pump works longer to drain water properly.
* To activate this function, it is necessary to set it to EEPROM on the main outdoor PCB.
EEPROM setting in main outdoor unit
CODE: 0C
Setting No.
0 Invalid
1 DP operates for 20 minutes and stops for 2 hours
2 DP operates for 20 minutes and stops for 20 minutes
3 DP always operates
DP operates for XX minutes when indoor unit's operation
changes;
4
from thermostat ON → thermostat OFF or operation
stopped.
DP operates for XX minutes when indoor unit's operation
5 changes;
from thermostat ON or thermostat OFF → operation stopped.
6 Both Setting No. 4 and 5 functions.
7 DP operates for XX minutes when indoor unit's operation
(Factory changes
preset from thermostat ON or thermostat OFF → operation stopped.
mode)
* When setting No. 4 – 7 is selected, this function works only for below indoor unit types.
Types : F1, F2, M1, E1
* Operating time mentioned "XX" above is able to set in EEPROM of the main outdoor unit.
Fan speed set by remote controller
Fan speed is "L" when thermostat ON
Fan speed is "LL"when thermostat OFF
1 - 25
3WAY SYSTEM
Control Functions
Indoor unit under this control
All units
(Mode, Operation / Stop
Thermostat ON / OFF
doesn't concern)
Cooling mode
Dry mode
Heating mode
Cooling mode
Dry mode
1