Daikin UATYA180BFC2Y1 [46/534] Control and safety components activation set

Translation from original instructions

Packaged Rooftop

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

UATYA

4P645202-1

6.3 Calibration of safety components

Any work on the unit must be carried out by qualied authorised personnel. Incorrect calibration

values can cause serious damage to the unit and harm people.

The control and safety equipment is calibrated and tested in the factory before the unit is shipped.

However, after the unit has been started, the safety devices must be checked (only the high pressure switches).

The checks must be carried out as described in the "Periodic checks" chapter.

The calibration values are shown in the table

Control and safety components

Activation set

point

Di󰀨erential Reset

High pressure switch for UATYA25 42,0 barg 8,0 barg Manual

High pressure switch for 2.1 42,0 barg 8,0 barg -

High pressure switch for all the others 44,0 barg 8,0 barg -

High pressure safety valve (where present) 46 barg - -

6.4 Checks during operation

With the circuits operating at 100% and stable at working conditions near the nominal ones, check:

- that the electrical absorption of the unit is close to the data shown in the wiring diagram. Considerably di󰀨erent

values may be due to the reduced capacity operation of the unit, to working conditions very di󰀨erent from the

nominal ones or to the malfunctioning of one or more components.

- that the di󰀨erence between the condensing temperature of each circuit and that of the air is less than 25°C. If it

is greater, check that all the fans involved are turning correctly and that there are no obstructions or dirt on the

surface of the condensing coil;

- the superheating value of the suction gas: the optimal value is between 4 and 7°C;

- the subcooling value of the liquid leaving the condenser: the optimal value is between 5 and 10°C;

- that the liquid sight glass is green;

- that no bubbles appear on the sight glass placed in the liquid pipe. The continuous presence of bubbles may

indicate a lack of refrigerant charge; the occasional or sporadic presence of bubbles is allowed;

- that the refrigerant lter is not blocked or clogged. To this end, it is su󰀩cient to measure the temperature of the

liquid pipe immediately before and immediately after the lter, and check that there are no signicant di󰀨erences

(up to a couple of degrees C di󰀨erence is allowed).

- that the condensate drain is working correctly.