Panasonic U-8ME1E8E Service Manual page 25

5. Outdoor Fan Controls
5-8. Snow Removal Control
5-8-1. Independent control of outdoor unit
This control is intended to prevent snow from accumulating on stopped fans.
Fan motor works at 500rpm in the below conditions even if the outdoor unit stops.
- Fan motor operates for 45 seconds and stops for 2 hours when ambient temperature is 5.1℃ or more.
- Fan motor operates for 45 seconds and stops for 1.5 hours when ambient temperature is 1.1 - 5.0℃.
- Fan motor operates for 45 seconds and stops for 1 hour when ambient temperature is 1.0℃ or less.
1
5-8-2. Control with snow detection sensor (Field supply)
If a snow detection sensor (field supply) is available, the snowfall-protection hood might be unnecessary
excluding heavy snow region.
If this function is active, the fan motor of the outdoor unit works at 600 rpm when the snow detection sensor
detects snow.
One snow detection sensor can control all outdoor units on the communications wiring. The snow detection
sensor can be connected with any outdoor unit regardless of the main or sub and it can control all outdoor units in
communication wiring.
* To activate this function, it is necessary to set it to all EEPROMs on outdoor PCBs.
CODE: 04
Setting Operation
No
0 Snow detection sensor is NOT connected with this unit.
But this function is performed according to the signal of the sensor connected with other outdoor
unit.
(Factory preset mode)
1 Snow detection sensor is connected with this unit.
And this function is performed according to the sensor signal.
2 Snow detection sensor is NOT connected with this unit.
And this function is NOT performed.
3 Snow detection sensor is connected with this unit.
But this function is NOT performed.
Snow detection sensor
Unit No. 1
Setting No.
Fan motor state
in case of snow
System address 1
Unit No. 2
Unit No. 3
0 1 0
ON ON ON
* All main outdoor units are connected with same communication wiring
System address 2
Unit No. 2
Unit No. 1 Unit No. 3
0 0 0
ON ON ON
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2WAY SYSTEM
Control Functions - Outdoor Unit
System address 3
Unit No. 2
Unit No. 1 Unit No. 3
2 2
OFF OFF
2
OFF