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W-2WAY ECO-i SYSTEM
Control Functions
(3) Outdoor unit PCB LED indications in judgment mode
When judgment mode is not engaged, the LED indicates the normal display (OFF), or else indicates alarms or
other information.
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).
[1] Automatic cancel
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> General Guidelines for Insufficient Gas and Overcharge
Judgment in automatic judgment mode can be problematic in some cases. Therefore, the following guidelines
are provided for general judgment of the refrigerant amount.
• Symptoms of insufficient gas
• Symptoms of overcharge
These are only guidelines, therefore the judgment may vary depending on the installation conditions, load char-
acteristics, and other elements.
The high-pressure sensor temperature is 57 C or highe r, and the diffe rence [Pressure sensor
temp. – Liquid temp.] at that outdoor unit is large (15 C 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 a t start, and the difference [Pressure sensor temp. – E3] at that
indoor unit is large (25 C 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 a t start, and the difference [E3 – E1] at that indoor unit is large
(15 C or more).
There is an outdoor unit where the position of the electronic c ontrol valve is much higher (open by
300 pulses or more) than it was a t start, and the difference [Liquid temp. – Gas temp.] at that
outdoor unit is large (15 C or more).
J
Judgment items
udgment mode Blinking Blinking
Normal ON ON
Insufficient gas Blinking
Blinking alternately
OFF C
-
-
-
harge with refrigerant a little at a time.
Overcharge OFF Blinking Recover refrigerant a little at a time.
Judgment not
possible
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