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2WAY SYSTEM
Control Functions-Outdoor Unit
1
13. Other Functions
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1
2WAY SYSTEM
Control Functions-Outdoor Unit
13. Other Functions
13-3-3. 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.
13-3-4. 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 TEST pin for 1 second or longer. Then open circuit.
* Judgment will not be canceled unless the TEST pin becomes open.
<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
Cooling
operation
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 (15 °C or more).
Heating
operation
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 (15 °C or more).
• Symptoms of
over
charge
Cooling
operation
The high-pressure sensor temperature is 55 °C or higher, and the difference
[High-pressure sensor temp. – Liquid temp.] at that outdoor unit is large (15 °C or more).
Heating
operation
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
[High-pressure sensor temp. – E1] at that indoor unit is large (20 °C or more).
These are only guidelines, therefore the judgment may vary depending on the installation conditions, load
characteristics, and other elements.
Judgment item
LED1
LED2
Remarks
Judgment mode
Blinking
Blinking
LED1 and LED2 blink simultaneously.
Normal
Blinking
Blinking
LED1 and LED2 blink alternatively.
Overcharge
OFF
Blinking
Recover refrigerant a little at a time.
Judgment not possible
ON
ON
-
Insufficient gas
Blinking
OFF
Charge with refrigerant a little at a time.
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