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3WAY SYSTEM
Control Functions
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13. Other Functions
This system includes a simple function for judging the amount of refrigerant.
13-2-1. Starting refrigerant level judgment mode
13-2-2. Conditions for amount of refrigerant judgment
13-2-3. Outdoor unit PCB LED indications in judgment mode
13-2-4. Canceling judgment mode
Short-circuit the CHK 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
continuously for 30 minutes or longer.
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.
When judgment mode is cancelled, the LED returns to the standard status display (OFF unless an alarm or
other event has occurred).
Judgment mode is canceled automatically when 4 hours have passed after it was started.
Short-circuit the CHK pin while the judgment mode display is active in order to cancel judgment mode
Judgment in automatic judgment mode can be problematic in some cases.
Therefore, the following guidelines are provided for general judgment of the refrigerant amount.
These are only guidelines, therefore the judgment may vary depending on the installation conditions,
load characteristics, and other elements.
<Reference>
Symptoms of insufficient gas
Symptoms of overcharge
General Guidelines for Insufficient Gas and Overcharge
[1] Automatic cancel
[2] Forced cancel
* Amount of refrigerant judgment requires that all outdoor units operate continuously for 30 minutes or longer.
This is in order to prevent incorrect adjustment of amount of refrigerant 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.
13-2. Function for Automatic Judgment of Insufficient Refrigerant Gas and Overcharge
Judgment item
LED1
LED2
Recommended response
Judgment mode
Blinking
Blinking
-
Cooling
operation
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).
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).
Cooling
operation
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
[Pressure sensor temp. – E3] at that indoor unit is large (25 °C or more).
The high-pressure sensor temperature is 57 °C or higher, and the difference
[Pressure sensor temp. – Liquid temp.] at that outdoor unit is large (15 °C or more).
Normal
OFF
OFF
-
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.
SM830226-00̲3WAY ECO-i SYSTEM.in49 49
SM830226-00̲3WAY ECO-i SYSTEM.in49 49
2013/02/13 11:52:30
2013/02/13 11:52:30
