Daikin UATYA180BFC2Y1 [15/534] Refrigerant leak detector

Translation from original instructions

Packaged Rooftop

We reserve the right to make changes without any prior notice.

UATYA

4P645202-1

2.2.2 Refrigerant leak detector

This unit is equipped with a refrigerant leak detector for safety.

To be e󰀨ective, 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 airow

logic with a x airow value. This in order to not let the airow to go below Q

min

as dened in the

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 airow.

In the unlike event that the airow is not able to reach the minimum airow level "Q

min

and the leak

detector is faulty, a dedicated relay in the electrical cabinet will be energized. This signal must be

used to warn the user that the airow is reduced (e.g. a buzzer and a ashing 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 o󰀨 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 rst informative point of this paragraph).