Refrigerant Leak Detector - Daikin UATYA-BBAY1 Manuel D'installation, D'utilisation Et D'entretien

2.2.2

Refrigerant leak detector

This unit is equipped with a refrigerant leak detector for safety.
To be effective, the unit must be electrically powered at all times after installation, other than when
servicing.
A refrigerant leak detector is installed in the unit between the supply coil and the supply fan(s).
This device allows immediate detection of refrigerant leaks in order to start what reported in the above paragraph
"Limit to the use – This device allows immediate detection of refrigerant leaks in order to start what reported in the
above paragraph "Limit to the use – Minimum area required and maximum refrigerant charge".
The detector has an internal self-testing routine. If this routine detects a fault the unit control will
automatically modify the supply and return (if present) fan control in order to set a constant airflow
logic with a fix airflow value. This in order to not let the airflow to go below Q
paragraph "Limit to the use – Minimum area required and maximum refrigerant charge". The fans will
operate continuously even if time tables are set, in order to have always the minimum required airflow.
In the unlike event that the airflow is not able to reach the minimum airflow level "Q
detector is faulty, a dedicated relay in the electrical cabinet will be energized. This signal must be
used to warn the user that the airflow is reduced (e.g. a buzzer and a flashing light).
Once the gas alarm of the leak detector system is released, the output is not reset even if the gas
concentration decreases. After detecting and repairing the leak spot, a manual reset of the alarm
can be operated. To reset the alarm output turn the power supply to the gas sensor off and on (e.g.
disconnecting and reconnecting its cable), if the alarm output will not be reset after this operation, it
means that leak has exceeded 10000 ppm, and the gas sensor has to be replaced.
The gas sensing part of the sensor has a designed life of 10 years. A countdown is set inside the
detector control and read by the unit control.
Six months before the expire of the countdown a warning message will appear on the unit HMI. If the
calibration will not be performed in time a warning message will appear on the unit HMI and the unit
control will operate as in case of a leak detector fault (see first informative point of this paragraph).
Translation from original instructions
Packaged Rooftop
16
as defined in the
min
and the leak
min
We reserve the right to make changes without any prior notice.
4P645202-2
UATYA