Servicing And Maintenance Functions - Panasonic U-4LE1E5 Service Manual

14. Servicing and Maintenance Functions

The below functions are available, and are selected by the outdoor unit EEPROM settings.
14-1. Outdoor Unit Noise Countermeasures (outdoor Quiet mode function)
This function reduces the operating noise to lessen the noise produced by the outdoor unit. When this mode is
selected, noise reduction is given priority during operation, and the outdoor fan mode and compressor operating
1 frequency are restricted (to approximately 80% of capacity).
The following two operations are required in order to engage this mode. (This mode cannot be engaged when nei-
ther (1) nor (2) below has been completed.)
(1) Outdoor unit EEPROM settings
Outdoor unit EEPROM 05 can be set from 0 to 1.
EEPROM Max. fan
setting
0
1
(2) Short-circuit the "SILENT"2P pin on the outdoor unit PCB.
Noise reduction mode is engaged constantly when this pin is short-circuited. To operate in noise reduction
mode only at night, or for similar control at other times, use an external timer (field supply).
14-2. Slime Countermeasure:EEPROM 0C (set only on the main unit)
This setting controls the operation of the drain pump.
EEPROM
setting
0 Normal operation (setting at time of factory shipment)
1 Drain pump operates for 20 minutes at 2-hour intervals
2 Drain pump operates for 20 minutes, at intervals of 20 minutes
3 Drain pump operates continuously
14-3. Delayed Start for Each System:Outdoor EEPROM 3E
The operation start time can be delayed according to the set system addresses.
This setting reduces voltage drops by preventing multiple systems from starting at the same time when operation is
restarted after recovery when multiple operating systems were stopped due to a power outage or other cause.
EEPROM
setting
0 Delayed start is not performed (setting at time of factory shipment)
1 System address: Delay in seconds before start
2 Start after System address × 2 seconds
3 Start after System address × 3 seconds
<Reference> Indoor unit discharge temperature control
Operating mode
Discharge temperature control value
Change method
The method is the same as ordinary indoor unit discharge temperature shift.
mode
14 Normal operation (setting at time of factory shipment)
12 5 and 6 hp units. Noise reduced by approx. 3 dB from the catalog value.
11 Only 4 hp unit. Noise reduced by approx. 3 dB from the catalog value.
Details of operation
Enter shift value
for indoor EEPROM
setting "1C."
Effect
Effect
Cooling Heating
12
Enter shift value
for indoor EEPROM
setting "1D."
1 - 20
Mini VRF SYSTEM
Control Functions
50
Capacity ratio
100%
Approx. 80%