Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 29

5. Outdoor Unit CCU (command controller
6. Outdoor Unit CCU (command controller unit) Control
unit) Control
3-2. Heating mode
The indoor unit fan in heating mode is stopped from the CCU in the following condition.
Discharge air temperature of indoor unit ≤ 20°C
High pressure saturated temperature (HPT) in outdoor unit ≤ 25°C
Liquid temperature (E1) in indoor unit ≤ 20°C
(4) Drain Pump Control
The 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 the CCU control at the following condition.
DP counter ≥ 5
* The DP counter counts each oil recovery control, and 4-way Valve Adjustment Control in cooling operation.
Liquid temperature (E1) in the indoor unit which selected cooling mode < 0 °C
* Regardless of operating / stopped mode
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
term.
Therefore, the drain pump works longer to drain water surely.
* To activate this function, it is necessary to set EEPROM on the main outdoor unit PCB.
EEPROM setting in main outdoor unit
CODE: 0C
Setting No.
0
1
2
3
4
5
6
7 (Factory
preset mode)
* When any of setting Nos. 4 – 7 is selected, this function works only for the type of F2, M1.
Movement of drain pump
Invalid
DP operates for 20 minutes and stops for 2 hours
DP operates for 20 minutes and stops for 20 minutes
DP always operates
DP operates for XX minutes when indoor unit's operation changes;
from thermostat ON → thermostat OFF or operation stopped.
DP operates for XX minutes when indoor unit's operation changes;
from thermostat ON or thermostat OFF → operation stopped.
Both Setting No. 4 and 5 functions.
DP operates for XX minutes when indoor unit's operation changes
from thermostat ON or thermostat OFF → operation stopped.
Control Functions - Outdoor unit
1 - 19
2WAY VRF SYSTEM
Mini VRF SYSTEM
Control Functions
Indoor unit
operation mode
All mode
Cooling mode
Dry mode
Heating mode
Cooling mode
Dry mode
1