Daikin UATYQ65ABAY1 [17/44] Control and safety devices
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Daikin UATYQ65ABAY1 [17/44] Control and safety devices

Daikin UATYQ20ABAY1 [17/44] Control and safety devices
Translation from original instructions
Installation manual
17
We reserve the right to make changes without any prior notice.
UATYQ*Y1
Packaged Rooftop
4P522680-1
4.3 Control and safety devices
The unit is integrally managed by an electronic microprocessor control that, through the various installed temperature
and pressure sensors, keeps its operation within the safety limits.
All the parameters involved with control of the unit are shown in the “Operating Manual” that is an integral part of the
documentation of the unit.
The manual fully describes the logic with which the checks of the unit take place during the various operating stages.
The control and safety devices are shown in the Technical Catalogue.
4.4 Principles of operation
The basic operation of these units uses a reverse vapour compression cycle to change the thermo-hygrometric
conditionsoftheairintheinteriorenvironment.Thesimplestcongurationworksintotalairrecirculation.
The refrigeration cycle allows heat to be transferred from a uid at a lower temperature to a uid at a higher
temperature.Rooftopunitsareequippedwithoneormorerefrigerantcircuits;incoolingmode,airiscooled-andif
necessarydehumidied-byannedcoil(evaporator);theremovedheatisrejectedtotheoutsidebyanothernned
coil(condenser).
In addition to this, the heat pump versions allow the evaporator and condenser roles to be reversed, thereby providing
the heating function.
Besides air ltration, other functions are possible, which change according to the conguration and the selected
accessories:partialairrenewal,thermodynamicrecovery,supplementaryheatingbyelectricheaters,freecooling/
free heating.
4.5 Structure
Dependingonthesizes,thestructureismadeofgalvanizedsheet-ironcoatedwithepoxypolyesterpowderat180°C,
whichmakesithighlyresistanttoweatherconditions,orofextrudedaluminiumalloyprolesconnectedwithglass
brereinforcednylonjoints.
Thebaseandcoveraremadeofthick,epoxypolyesterpowdercoated,galvanizedsheet-iron.
The panelling is made with 25mm thick sandwich panels consisting of a 0.5 mm thick externally pre-painted
galvanizedsheet-ironcasinglledwithpolyurethanefoamtoguaranteethethermalandacousticinsulationoftheunit.
Alternatively, the panels are insulated with closed-cell insulating matting or with rock wool, for the "heat generator"
section.Thesurfaceofthepanelsincontactwiththetreatedairismadeofgalvanizedsheet-irontofacilitatecleaning
andsanitizingoperations.
Thenon-removablepanelsarexedtothestructurewithscrewscontainedinnylonbusheswithplug.
The removable panels are attached to the structure with nylon eccentrics or inserts and have handles to make them
easier to remove.
4.6 Specications
Direct expansion air conditioner with hermetic compressors, evaporating coil with radial fans and condensing coil
with axial fans.
The unit is made in two sections that are joined together but functionally separate. One section is for transferring the
energy absorbed from the treated interior environment into the atmosphere. The other section is for air handling and
allowsairconditioningoftheconnedenvironmenttobetreated.
Incongurationswhereairexchangeisenvisaged,heatrecoveryandfreecooling/freeheatingcanbemanaged.
For heating, there may be a group of electric heaters.

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