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18-1. Snowfall Sensor Functions: Outdoor EEPROM 04
* If the snowfall sensor is used, then depending on the circumstances it is necessary to make the correct setting at
all outdoor units in the system.
* If “control is not performed” is set, control by the above signal is ignored. This setting is used in order to conserve
energy at outdoor units that include a snowfall-protection hood.
Recommended: If a low-speed fan mode is required (for all-year cooling or other reasons), install a snowfall-pro-
tection hood and set this setting to ON
.
[1] Outdoor units where “sensor input present” is set send the snowfall sensor input information every 10 min-
utes to all linked systems if the system wiring is linked.
[2] At systems where “control is performed” is set, the above information is used to control operation of the out
door fan.
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[3] At systems where “control is not performed” is set, the snowfall sensor input and above information ignored,
and the outdoor fan does not operate.
[4]
<Caution>
18-2. Function for Automatic Judgment of Insufficient Refrigerant Gas and Overcharg e
Short-circuit the CHECK pin on the No. 1 outdoor for 4 seconds or longer to engage this mode. (The LED on
the outdoor unit PCB begins blinking.)
After judgment mode starts, judgment occurs when all outdoor units in the system have been operating contin-
uously for 30 minutes or longer.
0
1
2
3
A unit identified as having a snowfall sensor attached will periodically send a signal indicating the snowfall sensor
input status to all outdoor units in the same system (or all wired outdoor units in the case of linked systems). It is
therefore unnecessary to install and wire multiple snowfall sensors.
Sensor input not present. Control is performed. (Setting at time of factory shipment)
Sensor input present. Control is performed.
Sensor input not present. Control is not performed.
Sensor input present. Control is not performed.
Setting
Operation
(1) Snow fall sensor settings
(2) Control operation
In case of W-2WAY ECO-i system, control can be performed when snowfall sensor input is connected to
any outdoor unit.
Snowfall sensor input information is detected once every 10 minutes. Therefore, the outdoor fan may continue
operating for up to 10 minutes even when there is no snowfall sensor input.
In addition, the outdoor fan may remain stopped for up to 10 minutes when snowfall sensor input is present.
This system includes a simple function for judging the level of refrigerant. However, be aware that false judgments
may occur if the control elements of the outdoor unit or indoor unit fail.
(1) Starting refrigerant level judgment mode
(2) Conditions for refrigerant level judgment
* Refrigerant level judgment requires that all outdoor units operate continuously for 30 minutes or longer. This is
in order to prevent incorrect adjustment of the refrigerant level based on false detection caused by refrigerant
accumulation or recovery at stopped outdoor units, which is due to failures of functional elements.
After the judgment is displayed, repeated judgment will occur under new operating conditions if all outdoor
units continue operating. Therefore, the judgment display may change when later judgments occur.
* Judgment mode is automatically canceled after 4 hours.
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18. Other Functions
W-2WAY ECO-i SYSTEM
Control Functions