Panasonic U-120ME2U9, Руководство по обслуживанию, Страница: 26 / 206

2WAY VRF SYSTEM
Control Functions
1 - 18
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4
5
6
7
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5. Outdoor Unit Fan Control
(1) Fan Mode
These outdoor units utilize a DC fan motor that can be controlled in a maximum of 15 steps (15 modes).
However, fan modes 14 and 15 can only be used if high static pressure mode has been set.
* For information concerning EEPROM settings, refer to the field application functions.
The following table shows the maximum and minimum fan mode and fan forced mode for each unit.
Status of
heat exchanger
Type of outdoor unit
72 96 120 144
Maximum value
Standard
Condenser 13 13 12 12
Evaporator
Ambient
temperature >
50°F
(10°C)
13 13 12 12
Ambient
temperature
≤
50°F
(10°C)
13 13 13 13
High static
pressure mode
setting
Condenser 15 15 12 12
Evaporator
Ambient
temperature >
50°F
(10°C)
15 15 12 12
Ambient
temperature
≤
50°F
(10°C)
15 15 13 13
Minimum value * 1 1 1 1
* For the sake of protecting temperature of the electrical parts, the minimum values of the fan mode may
sometimes increase in accordance with the ambient temperature or the amount of secondary current.
1-1. High static pressure mode
The outdoor unit allows a high static pressure changing the settings.
The maximum permissible static pressure is 0.01psi (80Pa).
EEPROM setting in each outdoor unit
CODE : 8F
Setting No.
0 Invalid (factory preset mode)
1 High static pressure mode
2 Never use
3 Never use
4 Never use
5 Never use
6 Never use
However, maximum fan mode is upper limit.
2WAY VRF SYSTEM
Control Functions
5. Outdoor Unit Fan Control
Independent control of outdoor unit
This control is intended to prevent snow from accumulating on stopped fans.
The fan motor rotates at 500rpm in the below conditions even if the outdoor unit stops. (1)
Control with snow detection sensor (field supply)
If a snow detection sensor (field supply) is available and this function is set in validity, the fan motor of the outdoor
unit rotates at 600 rpm when the snow detection sensor detects snow.
The judgment of this control performs at 10 minutes interval.
One snow detection sensor can control all outdoor units on the communications wiring.
The snow detection sensor is only possible to connect to the main outdoor unit (unit No.1) and it can control all
outdoor units in communication wiring. (2)
Fan motor operates for 45 seconds and stops for 2 hours when ambient temperature is 41.18°F (5.1°C) or
more.
Fan motor operates for 45 seconds and stops for 1.5 hours when ambient temperature is 32.2 - 41.0°F
(0.1 - 5.0°C).
Fan motor operates for 45 seconds and stops for 1 hour when ambient temperature is 32.0°F (0.0°C) or less.
EEPROM setting in each main outdoor unit
* All outdoor units are connected with same communication wiring.
To activate this function, it is necessary to set it to the EEPROM on each system’s main outdoor unit PCB.
CODE: 04
System address 1
Snow detection sensor installed
Unit No.
1
Unit No.
1
Unit No.
1
Unit No.
2
Unit No.
2
Unit No.
2
Unit No.
3
Unit No.
3
Unit No.
3
System address 2 System address 3
Function
No snow detection sensor is connected but control is available. (at factory shipment)
Snow detection sensor is connected and control is available.
Setting No.
0
1
No snow detection sensor is connected and control is not available. 2
Snow detection sensor is connected but control is not available. 3
Setting No.
Fan motor
status during
snowfall
1 0 0 0 0 0 2 2 2
ON ON ON ON ON ON OFF OFF OFF
1-2. Snow removal control
SM830237-07_北米向け2WAY_VRF.indb 18 18/06/19 18:55:32