Daikin UATYA-B, Operation Manual

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
- closes the digital output to control an area damper and additional ventilation, which are not incorporated in the unit. The
control corresponds to terminals “666” and “667” in the terminal board of the electrical cabinet;
- it activates alarm “AL154” to warn about refrigerant gas having been detected in the air.
In the event of a serial communication failure with the gas detector, a sensor malfunction or the need to replace it, the con -
troller:
- it sets the dampers for total air recycling;
- overrides ventilation in the delivery line with an air flow equal to at least the setpoint in parameter “FA25”;
- overrides ventilation in the return line with an air flow equal to the setpoint in parameter “RFA25”;
- closes the digital output to control an area damper and additional ventilation, which are not incorporated in the unit. The
control corresponds to terminals “666” and “667” in the terminal board of the electrical cabinet;
- activates the relevant alarm messages.
The operating conditions connected to the alarms of the gas detector are kept for the time set in parameter “PAL22”, inclu -
ding when their triggering causes are resolved.
If one of the conditions above applies together with a ventilation alarm, the controller closes an additional
digital output to warn about failure to perform the safety procedure correctly.
The digital output in the controller corresponds to terminals “668” and “669” that represent the the poten
-
tial-free contact in the terminal board of the electrical cabinet.
The controller starts the procedure following an alarm connected to the gas detector, including when the unit
is in “OFF” mode.
3 Software functions