Service Maintenance Functions - Panasonic U-10MF1E8 Service Manual

18. Service Maintenance Functions

The outdoor unit EEPROM settings can be used for the following functions.
18-1. Outdoor Unit Noise Countermeasure: EEPROM 05 (set at each outdoor unit)
This unit includes 3 types of Quiet modes. (However, when they are engaged, operation is in Quiet mode 24 hours
a day.) Selecting a Quiet mode results in operation that gives priority to reducing noise. Because these modes
involve restrictions on outdoor unit fan modes and the operation frequency, the capacity will be somewhat reduced.
Setting Max. fan mode
0 14
1 12
2 11
3 10
* If Quiet mode is set, the capacity will begin to decrease during heating operation at low outdoor temperatures,
when the outdoor air temperature is below standard conditions.
* It is possible to set Quiet mode only for nighttime by using the snowfall sensor input terminal and a timer for quiet
operation. In this case, operation is the Quiet mode determined by the above setting.
18-2. Slime Countermeasure: EEPROM 0C (set only on the main unit)
This setting controls the operation of the drain pump.
Setting
0 Normal control (setting at time of factory shipment)
1 The drain pump operates for 20 minutes at 2-hour intervals.
2 The drain pump operates for 20 minutes at 20-minute intervals.
3 The drain pump operates constantly.
18-3. Delayed Start for Each System: Outdoor EEPROM 3E (set only on outdoor unit No. 1)
The operation start time can be delayed according to the set system addresses.
This setting reduces the voltage drop by preventing multiple systems from starting at the same time when operation
is restarted after multiple operating systems were stopped due to a power outage or other cause.
Setting
0 No delayed start (setting at time of factory shipment)
1 Start begins after [1 second × System address]
2 Start begins after [2 seconds × System address]
3 Start begins after [3 seconds × System address]
18-4. Automatic Backup: Outdoor EEPROM 48 (set only on outdoor unit No. 1)
Automatic backup is set to occur at the time the unit is shipped from the factory. However, the automatic backup
function can be disabled by changing this setting to 1.
Effect
Normal operation (setting at time of
factory shipment)
Noise reduced by approx. 1 – 2 dB from
the catalog value.
Noise reduced by approx. 2 – 3 dB from
the catalog value.
Noise reduced by approx. 5 dB from the
catalog value.
Description
Effect
1 - 33
3-WAY SYSTEM
Control Functions
Amount of capacity reduction
0
Approx. 0.5 hp
Approx. 1.2 hp
Approx. 1.8 hp
1