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When judgment mode is not engaged, the LED indicates the normal display (OFF), or else indicates alarms or
other information.
[1]
Judgment mode is canceled automatically when 4 hours have passed after it was started.
[2] Forced cancel
Short-circuit the CHECK pin while the judgment mode display is active in order to cancel judgment mode.
<Reference>
Judgment in automatic judgment mode can be problematic in some cases. Therefore, the following guidelines
are provided for general judgment of the refrigerant amount.
-
-
-
Judgment items
Judgment mode
Normal
Insufficient gas
Overcharge
Judgment not
possible
Blinking
ON
Blinking
OFF
Blinking alternately
Blinking
ON
OFF
Blinking
LED1
LED2
Recommended response
Charge with refrigerant a little at a time.
Recover refrigerant a little at a time.
If the insufficient gas or overcharge judgment is not stable, then recover refrigerant a little at a time when the
overcharge display appears. End refrigerant adjustment when the normal or insufficient gas display appears.
(4) Canceling judgment mode
When judgment mode is cancelled, the LED returns to the standard status display (OFF unless an alarm or
other event has occurred).
Automatic cancel
General Guidelines for Insufficient Gas and Overcharge
• Symptoms of insufficient gas
• Symptoms of overcharge
There is an indoor unit where the position of the electronic control valve is much higher (open by
300 pulses or more) than it was at start, and the difference [E3 – E1] at that indoor unit is large
(30°F or more).
There is an outdoor unit where the position of the electronic control valve is much higher (open by
300 pulses or more) than it was at start, and the difference [Liquid temp. – Gas temp.] at that
outdoor unit is large (30°F or more).
The high-pressure sensor temperature is 134°F or higher, and the difference [Pressure sensor
temp. – Liquid temp.] at that outdoor unit is large (30°F or more).
There is an indoor unit where the position of the electronic control valve is much higher (open by
300 pulses or more) than it was at start, and the difference [Pressure sensor temp. – E3] at that
indoor unit is large (50°F or more).
These are only guidelines, therefore the judgment may vary depending on the installation conditions, load char-
acteristics, and other elements.
(3) Outdoor unit PCB LED indications in judgment mode
Cooling
operation
Heating
operation
Cooling
operation
Heating
operation
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W-2WAY ECO-i SYSTEM
Control Functions
18. Other Functions