Daikin UATYQ-AFC3Y1 Quick start guide

Installation, use and
maintenance manual
Rooftop Packaged Unit
Models:
UATYQ20ABAY1
UATYQ25ABAY1
UATYQ30ABAY1
UATYQ45ABAY1
UATYQ50ABAY1
UATYQ55ABAY1
UATYQ65ABAY1
UATYQ75ABAY1
UATYQ90ABAY1
UATYQ110ABAY1
UATYQ115ABAY1
UATYQ20AFC2Y1
UATYQ25AFC2Y1
UATYQ30AFC2Y1
UATYQ45AFC2Y1
UATYQ50AFC2Y1
UATYQ55AFC2Y1
UATYQ65AFC2Y1
UATYQ75AFC2Y1
UATYQ90AFC2Y1
UATYQ110AFC2Y1
UATYQ115AFC2Y1
UATYQ20AFC3Y1
UATYQ25AFC3Y1
UATYQ30AFC3Y1
UATYQ45AFC3Y1
UATYQ50AFC3Y1
UATYQ55AFC3Y1
UATYQ65AFC3Y1
UATYQ75AFC3Y1
UATYQ90AFC3Y1
UATYQ110AFC3Y1
UATYQ115AFC3Y1
Installation, use and maintenance manual
Rooftop Packaged Unit English

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UATYQ*Y1
Packaged Rooftop
4P522680-1
Contents
1 Introduction 6
1.1 Conformity 6
1.2 Description 6
1.2.1 Symbols 6
1.2.2 Labels 7
2 Safety 8
2.1 General safety precautions 8
2.1.1 Dischargeofthesafetyvalves 9
2.2 Basic rules 10
2.3 Noise levels 11
2.4 Residual risks 11
2.5 Safetyinformationontherefrigerantuid 12
2.5.1 Hazardsandhealthconsequences 12
3 Receiving the product and storage 13
3.1 Reception 13
3.2 Transport 13
3.3 Handling 13
3.4 Storage 15
4 Product description 16
4.1 Intended use 16
4.2 Unintended use 16
4.3 Control and safety devices 17
4.4 Principles of operation 17
4.5 Structure 17
4.6 Specications 17
4.7 Air system 18
4.7.1 Internalairfans 18
4.7.2 Flowratesensorforfans 18
4.7.3 Airowsensor 18
4.7.4 Dirtyltersensor 19
4.7.5 AirltersG4 19
4.7.6 Programmablecontrol 20
4.8 Wiring diagram 21
5 Installation 22
5.1 Dimensions and weight 22
5.2 Installation site 22

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Packaged Rooftop
4P522680-1
5.3 Installation 23
5.3.1 Fittingofrainhoods 23
5.3.2 Externalpositioning 24
5.3.3 Anti-vibrationmounts 24
5.3.4 Minimumdistances 25
5.4 Electrical connections 26
5.5 Condensate drain connections 28
5.5.1 Condensatedrainoftheinternalaircoil 28
5.5.2 Condensatedrainoftheexternalaircoil 28
5.6 Aeraulic connections 29
5.6.1 Returnandsupplyducts 29
5.6.2 Connectionoftheducts 29
6 Commissioning 30
6.1 Preliminary operations 30
6.2 First starting 31
6.2.1 Preliminarychecks 31
6.2.2 Functionaltests 31
6.3 Calibration of safety components 32
6.4 Checks during operation 33
6.5 Alarms and malfunctions 34
6.6 Temporary stop 35
6.7 Stop for long periods of time 35
7 Maintenance 36
7.1 Adjustments 36
7.2 External cleaning 37
7.2.1 Cleaningthecoils 37
7.3 Internal cleaning 38
7.3.1 Cleaningtheunit 38
7.4 Periodic checks 39
7.5 Unscheduled maintenance 40
7.5.1 Specialwork 40
7.5.2 Exceptionalwork 40
8 Decommissioning 41

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UATYQ*Y1
Packaged Rooftop
4P522680-1
THANK YOU
Thank you for choosing our product.
Itistheresultofmanyyears’experienceandcarefuldesignandhasbeenbuiltwithrst-classqualitymaterialsand
advanced technologies.
DeclarationorcerticateofconformityalsoguaranteesthattheequipmentmeetstherequirementsoftheEuropean
Machinery Safety Directive.
The quality level is constantly monitored, and therefore our products are synonymous with Safety, Quality and
Reliability.
Changes considered necessary for product improvement may be made to the stated data at any time without any
obligation to give prior notice.
Thank you again
Read this manual carefully before installing, testing or starting this unit.
Give this manual and all complementary documentation to the operator of the system who will be
responsible for keeping them so they are always available if needed.
The images and drawings contained herein are examples only.

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UATYQ*Y1
Packaged Rooftop
4P522680-1
1 INTRODUCTION
1.1 Conformity
With regard to relevant regulations and directives, please see the declaration of conformity in the "document folder".
1.2 Description
1.2.1 Symbols
Adescriptionofthemainsymbolsusedinthismanualandonthelabelsa󰀩xedtotheunitisgivenbelow.
Danger symbol; take extreme care.
Danger symbol; moving mechanical parts.
Danger symbol; live parts.
Warning symbol; important information
Note symbol; suggestions and advice

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Packaged Rooftop
4P522680-1
1.2.2 Labels
For the constructional features, technical data and available models, please refer to the technical catalogue.
Themodel,serialnumber,features,powersupplyvoltageandsoonareshownonthelabelsa󰀩xedtotheunit(the
following illustrations are shown only as an example).
The Manufacturer adopts a continuous development policy and, in this perspective, reserves the right
to make changes and improvements to the documentation and to the units without prior notice.
The Technical Catalogue, the labels placed directly on the unit and the various diagrams referred to
below, must be considered an integral part of this manual.
Do not remove or alter the labels placed on the unit.

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UATYQ*Y1
Packaged Rooftop
4P522680-1
2 SAFETY
2.1 General safety precautions
Aspaceofabout2metresaroundtheunitisidentiedasexternaldangerzone.
Iftheunitispositionedinanunprotectedplacethatcanbereachedbyunqualiedpersons,accesstothisareamust
be prohibited by special guarding.
Theequipmentoperatorisresponsibleforcomplyingwithregulatoryobligations.
Theequipmentoperatoristhepersonwhohasactualcontroloverthetechnicaloperationandfreeaccess,which
means the possibility of monitoring its components and their operation and the possibility of granting access to third
parties.
Theequipmentoperatorhasthepower(includingnancialpower)todecideontechnicalmodications,checksand
repairs.
Theequipmentoperatormaygiveinstructionstoemployeesortoexternalcompaniesforcarryingoutmaintenance
and repair operations.
Only an authorised operator should be able to access the unit.
Installationandmaintenanceorrepairoftheunitmustbecarriedoutbypersonnelandcompaniesholdingacerticate
issuedbyacerticationbodydesignatedbyamemberstatethatcertiestherequirementscontainedinCommission
Regulation(EC)No.517/2014.
Theinternaldangerzonecanbeaccessedbyremovingtheprotectivedevicesandenteringtheunit.
Onnoaccountmustunqualiedpersonnelbeallowedtoentertheunitandnooneshouldbeallowedtoenterbefore
thepowertoithasbeenturnedo󰀨.
The user can interact with the unit only through the control and external OK signals.
Only authorised knowledgeable personnel may access the unit in compliance with safety in the workplace regulations.
CouncilDirective89/391/EEC,of12June1989,ontheintroductionofmeasurestoencourageimprovementsinthe
health and safety of workers at work.
Also, knowledge and understanding of the manual are indispensable for reducing risks and for improving the health
and safety of workers.
Theoperatorwhoenterstheunitmusthavesu󰀩cientknowledgetoperformthevariousactivitiesthroughoutthe
technical life of the machine.
The operator must know what to do when faced with possible anomalies, malfunctions or conditions of danger to
himself or others, and in any case, he must comply with the following instructions:
Stop the unit immediately by using the emergency device.
Do not do anything that goes beyond your duties and technical knowledge.
Inform the manager immediately and do not take personal initiatives.
Beforecarryingoutanyworkontheunit,makesureyouhaveturnedo󰀨thepowersupplytoit.Refer
to the section on maintenance work.

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UATYQ*Y1
Packaged Rooftop
4P522680-1
Inunitswithcapacitorsand/orinverters,certaincomponentscanremainliveforseveralminuteseven
afterhavingturnedo󰀨themainswitch.
Wait 10 minutes before working on the electrical parts of the unit.
Circuitssuppliedfromexternalsources(madewithorangecable)canremainliveevenafterthepower
supplytotheunithasbeenturnedo󰀨.
Workontheunitonlyifthereissu󰀩cientlightingforthetypeofworktobecarriedout.
Thelawregulatingtheuseofstratosphericozonedepletingsubstancesprohibitsthereleaseof
refrigerant gases into the environment and obliges owners to recover and return them to the dealer or
take them to special collection centres at the end of their operational life.
The refrigerant contained in the refrigerant circuit is included among the substances subject to special
control regulations provided for by law and must therefore be disposed of as indicated above.
Particular care should be taken during maintenance operations in order to reduce refrigerant leaks as
much as possible.
2.1.1 Discharge of the safety valves
Ifpresentontherefrigerantcircuit,installationrequirementsand/ornationalregulationslaydownthatthedischarge
of the safety valves must be routed to the outside.
The conveying must be done with a pipe whose diameter must be at least that of the valve outlet, and the weight of
the pipe must not be borne by the valve.
Always direct the discharge to areas where the jet cannot cause harm to anyone.
Risk of burns following contact with hot and cold parts.

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UATYQ*Y1
Packaged Rooftop
4P522680-1
2.2 Basic rules
AlltheunitsaredesignedandbuiltincompliancewithDirective2014/68/EUoftheEuropeanParliamentandofthe
Councilof15May2014ontheapproximationofthelawsoftheMemberStatesrelatingtopressureequipment.
To ensure maximum safety, in order to prevent possible risks, follow the instructions below:
- this product contains pressurised vessels, live components, moving mechanical parts and very hot and cold
surfaces that, in certain situations, can pose a risk: all maintenance work must be carried out by skilled personnel
equipped with the necessary qualications in accordance with current regulations. Before carrying out any
operation, make sure that the personnel in charge has full knowledge of the documentation supplied with the unit.
- always have a copy of the documentation near the unit.
- The operations indicated in this manual must be integrated with the procedures indicated in the user instruction
manuals of the other systems and devices incorporated in the unit. The manuals contain all the necessary
information for safely managing the devices and the possible operating modes.
- usesuitableprotection(gloves,hardhat,protectiveglasses,safetyshoes,etc.)forallmaintenanceorcontrol
operations carried out on the unit.
- Do not wear loose clothing, ties, chains, watches, etc., which can get caught in the moving parts of the unit.
- alwaysusetoolsandprotectiveequipmentinexcellentcondition.
- The compressors and delivery gas pipes are at high temperature. Therefore, when working in the immediate
vicinity, be careful to avoid touching any components of the unit without suitable protection.
- do not work in the discharge trajectory of the safety valves.
- iftheunitsarepositionedinunprotectedplaceswhichcaneasilybereachedbyunqualiedpersons,suitable
protection devices must be installed.
- the user must consult the installation and use system manuals, incorporated and attached to this manual.
- there may be potential risks that are not obvious. Warnings and signals are therefore displayed on the unit.
- Do not remove the warnings.
It is expressly forbidden to:
- remove or disable the safety guards;
- tamperwithand/ormodify,evenpartially,thesafetydevicesinstalledontheunit.
Iftherearealarmwarningsandconsequenttrippingofthesafetydevices,theusermustcallinskilledmaintenance
technicianstoxtheproblemimmediately.
An accident can lead to serious injury or death.
The safety devices must be tested according to the guidelines in this manual.
Themanufacturerdoesnotassumeanyliabilityfordamage/injurytopersons,petsorobjectsarisingfromthere-use
ofindividualpartsoftheunitforfunctionsorassemblysituationsdi󰀨erentfromtheoriginalones.Tamperingwith/
unauthorised replacement of one or more parts of the unit is prohibited.
The use of accessories, tools or consumables other than those recommended by the Manufacturer relieves the latter
from civil and criminal liability.
Deactivationandscrappingoftheunitmustbecarriedoutonlybysuitablytrainedandequippedpersonnel.
TheunitsdonotfallwithinthescopeofDirective2014/34/EUoftheEuropeanParliamentandof
the Council, of 26 February 2014, on the approximation of the laws of the Member States relating to
equipmentandprotectivesystemsintendedforuseinpotentiallyexplosiveatmospheres.

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Packaged Rooftop
4P522680-1
2.3 Noise levels
The starting of the unit, with activation of its components, emits a sound whose intensity varies according to the
operating level.
Correct site choice and correct installation prevent the unit from causing an annoying sound due to resonances,
reectionsandvibrations.
2.4 Residual risks
The unit uses technical means suitable for protecting people, animals and things against hazards that cannot
reasonablybeeliminatedorsu󰀩cientlyreducedthroughdesign.
Thepresenceofanoperatorisnotrequiredfornormaloperationoftheunit.Thechangefromthe"OFF"stateto
the "ON" state, and vice versa, of the unit can be carried out remotely or through the display, without having to enter
areas at risk.
Access restriction is part of correct installation to eliminate residual risks during normal operation.
Removal of the restrictions gives access to cold parts, hot parts and sharp edges.
When the electrical boxes and the electrical control panel are open, live parts can be accessed.
Do not:
- remove or disable the safety guards;
- tamperwithand/ormodify,evenpartially,thesafetydevicesinstalledontheunit.
Inheatpumpoperation,duringdefrostcycles,thewaterdripsontothegroundwhenthefrostmeltso󰀨thecoils.
Ifthewaterisnotproperlydrained,whentheambienttemperaturesaresub-zero,dangeroussheetsoficeareformed.
Limit access to the area to prevent accidents.

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Packaged Rooftop
4P522680-1
2.5 Safetyinformationontherefrigerantuid
ThisproductcontainsuorinatedgreenhousegasesincludedintheKyotoprotocol.Donotreleasethesegasesinto
the atmosphere.
Type of refrigerant: R410A
GWP value: 2088.
GWP is the global warming potential.
Thequantityofrefrigerantuidisindicatedintheunit’sdatalabel.Periodicinspectionsarenecessarytocheckfor
refrigerantuidleaksinaccordancewithlocaland/orEuropeanregulations.
2.5.1 Hazards and health consequences
Ifaccidentallyreleased,rapidevaporationoftheliquidcancausefreezing.
Incaseofcontactwiththeliquid:
- defrost the various part with water;
- remove clothing carefully;
- rinse thoroughly with water.
Contaminated clothing and shoes should be washed before reuse.
High vapour concentrations can cause headaches, dizziness, drowsiness and nausea, and may lead to
unconsciousness and cardiac arrhythmia.
Ifinhaledmovethevictimtofreshair.Articialrespirationand/oroxygenmaybenecessary.Calladoctorimmediately.
In case of contact with eyes, remove contact lenses. Rinse immediately with plenty of water, holding the eyelids open,
for at least 15 minutes.
The safety data sheet drawn up by the producer of the refrigerant can be obtained from the
manufacturer of the unit.

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Packaged Rooftop
4P522680-1
3 RECEIVING THE PRODUCT AND STORAGE
3.1 Reception
On receiving the unit, check that it is undamaged, bearing in mind that it left the factory in perfect condition.
Report any signs of damage immediately to the transporter and make a note of these on the Delivery Sheet before
signing it.
The relevant sales department or the manufacturer should be informed of the extent of the damage as soon as
possible.
TheCustomermustdrawupawrittenandphotographicreportconcerninganyandallsignicantdamage.
Disposal of the packing material is the responsibility of the consignee and must be carried out in compliance with the
regulations in force in the country in which it is carried out.
3.2 Transport
The unit is sent from the warehouse using suitable vehicles, with correct clamping in order to prevent any possibility
of movement whilst in transit by road that may damage it or cause accidents.
If there is to be trans-shipment to other vehicles to continue the journey, it is essential to adopt all necessary measures
for ensuring the correct safety conditions, with regard to the vehicles used and the anchorage, in order to prevent
damage.
If the unit is to be transported over uneven roads, the manufacturer must be informed beforehand so that suitable
measures can be taken in order to prevent damage to the unit.
If it is to be transported by container, make sure it is correctly anchored.
3.3 Handling
Before each unit handling operation, check that the lifting capacity of the machinery used is compatible with the
weight of the unit.
Handlingmustbecarriedoutbyadequatelyequippedqualiedpersonnel.
Inallliftingoperations,makesuretheunitisrmlysecuredinordertopreventaccidentalfallsor
overturning.
Liftingmustbecarriedoutbyqualiedandauthorisedpersonneltakingthenecessaryprecautions;if
carried out incorrectly, lifting can cause serious damage and physical injury.
The handling operations must be carried out slowly and sudden manoeuvres and knocks must be
avoided.
Donot,underanycircumstances,standorpassunderorneartheunitwhenitisliftedo󰀨theground.
Use only the lifting system designed and prepared for the unit.
During unloading and positioning of the unit, great care must be taken to prevent sudden or violent manoeuvres, and
the components of the unit must not be used as lifting points.
Make sure the machinery and lifting ropes are of suitable size and capacity and strictly follow their operating
instructions.Useonlyequipmentthatisinexcellentworkingorder.
All work on the unit, including unpacking and connections, must be carried out with the unit resting on the ground.
Refer, in any case, to the lifting instructions provided with the unit.

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Packaged Rooftop
4P522680-1
A pallet is secured under the unit so that it can also be unloaded and handled with a suitable forklift truck.
If anti-vibration mounts are installed under the base of the unit, this must be done with the unit raised by no more than
200 mm from the ground and without putting any parts of the body under it.
Beforeslidingoutthepallet,removethescrewsxingittotheunit.
Use a 10 mm spanner to unscrew the screws that are visible through the slotted holes of the base.
Fig.1Detailofpositionofpalletxingscrews
After the pallet has been removed, the unit should be lifted using only and solely the lifting slings and tubes supplied
withit,insertedintheliftingeyesmarkedwiththeplatesprovided(yellowplates).
For smaller sizes "UATYQ20A***Y1, UATYQ25A***Y1 and UATYQ30A***Y1", the slings can be inserted directly
through the lifting eyes.
Forsmallersizes"1.2,3.2and4.2",theslingscanbeinserteddirectlythroughtheliftingeyes.
Fig. 2 Lifting with slings
To prevent the slings from being damaged on the edges of the lifting eyes, use suitable protective
devices.
To prevent the slings from touching the unit, suitable protective devices must be placed on the upper
edges.

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Packaged Rooftop
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Fortheothersizes,theunitshouldbeliftedusingonlyandsolelytheliftingslingsandtubessuppliedwithit.
Fig. 3 Detail of hooking the sling to the lifting tube
To prevent the slings from touching the unit, suitable protective devices must be placed on the upper
edges.
It is mandatory to use a lifting beam adjusted to the width of the unit in order to ensure lifting stability
Fig. 4 Lifting with crane
3.4 Storage
Therearenospecialrequirementsiftheunithastobestoredtemporarilybeforeinstallation.
Since these units are intended for outdoor installation, they withstand normal atmospheric conditions without problem.
Theunitmustbeplacedonaatsurfacethatissuitableforbearingitsweight,inordertoavoiddeformationofthe
structurewithconsequentpossiblebreakage.

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UATYQ*Y1
Packaged Rooftop
4P522680-1
4 PRODUCT DESCRIPTION
4.1 Intended use
Theseunitsaremadeforaircoolingandheating,andaregenerallyusedinapplicationsintheairconditioningeld.
These are high e󰀩ciency, self-contained air conditioners, for both summer and winter use, that allow complete
thermo-hygrometric air handling to be achieved. They can be used in both commercial and industrial applications
that, besides having load variability, can be characterized by high latent loads and need to guarantee optimum
conditions for occupants.
Their use is recommended within the operating limits indicated in the technical catalogue.
4.2 Unintended use
The unit must not be used:
- in an explosive atmosphere;
- inaammableatmosphere;
- in extremely dusty environments;
- in an environment that is not compatible with the stated IP protection rating;
- by untrained personnel;
- in a way that does not comply with the regulations in force;
- with incorrect installation;
- with power supply defects;
- with total or partial failure to comply with the instructions;
- withlackofmaintenanceand/oruseofnon-originalspareparts;
- withine󰀩cientsafetycomponents.

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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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UATYQ*Y1
Packaged Rooftop
4P522680-1
4.7 Air system
4.7.1 Internal air fans
Dependingonthecongurations,theremaybeonlysupplyfansoralsoreturnfansintheunits.
The fans are radial fans with reverse blades, with external rotor motor directly coupled to the impeller.
The radial fans are called "EC", with electronically commutated brushless motor. The fan is powered by mains AC
voltage, and speed control is obtained via DC 0-10V control signal coming from the microprocessor installed on the
unit.Thismakesitpossibletosettheairowratethroughtheparameterbeingdisplayed.
The motors have alarm signalling, which includes thermal overload protection, overcurrent, undervoltage, absence
ofoneormorephasesandseizedrotor.
The EC fans are not provided with a contactor and are constantly live as soon as the main disconnect
switch of the unit is closed.
4.7.2 Flow rate sensor for fans
Unitswith"EC"fansareprovidedwithadi󰀨erentialpressuretransducerthatdetectsthepressuredi󰀨erencebetween
theinsideandtheoutside(upstream)oftheintakenozzle.Theairowrateisproportional,foreachfan/nozzlepair,
tothesquarerootofthepressuredi󰀨erenceaccordingtotheequation:
where
- Q=totalairow[m3/h]
- n = number of fans in the unit
- k=constantaccordingtothefannozzle
- ΔP=pressuredi󰀨erencemeasuredonthenozzle[Pa]
Thecharacteristicconstant"K"forthenozzlesusedis:
- Fan of diameter 450: k = 217
- Fan of diameter 500: k = 281
- Fan of diameter 560: k = 350
Thedi󰀨erentialpressurevalueandtheairowratecanbeshowndirectlyonthedisplayofthemicroprocessorthat
carriesoutautomaticcontroloftheairowrate.
4.7.3 Airowsensor
Thisdevicepreventstheunitoperatingintheabsenceofairow.Thecontroliscarriedoutbyadi󰀨erentialpressure
switchthatmeasuresthepressuredi󰀨erencebetweenupstreamanddownstreamoftheevaporatingcoilandtheair
lter.Themicroprocessoralarmcomesonlaterthaninterventionofthesensor.
To check their operation, open the automatic circuit breakers of the compressors, from the microprocessor card
removetheterminalwiththecontrolsignalfortheECfan(foridentication,refertothewiringdiagram),andthen
switch on the unit. The microprocessor alarm should appear within a few tens of seconds.

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UATYQ*Y1
Packaged Rooftop
4P522680-1
4.7.4 Dirtyltersensor
Thelevelofairltercloggingischeckedbymeansofadi󰀨erentialpressureswitchthatmeasuresthepressuredrop
betweenupstreamanddownstreamofthelter.
Thecontrolpanelwillsignal,viaanalarmonthedisplay,theneedtoreplaceorcleanthelter.Themachinewill
continue to work in any case.
The cut-in value is factory set and can be changed on the installed unit by turning the knob with graduated scale
using a screwdriver.
Thefoulingoftheltermaycauseadecreaseintheowrateandthereforeofthemachine’s
performance;restoringthelterasquicklyaspossiblefromthetimeofreportingisrecommended.
4.7.5 AirltersG4
Theunitsarettedwith"G4"ltersontheairsupplyside.Toreplacethelters,openthepaneloftheunitthatshows
theindicationforaccesstothelters.
Cleaningorreplacementisessentialtoensuregoodoperationoftheunitandthecorrectairowrate.

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Packaged Rooftop
4P522680-1
4.7.6 Programmable control
Forsomecongurationsandfunctionalities,aprogrammablecontrolisused.
Thegureshowsthemainscreen.
Fig. 5 Programmable control display
From the main screen, the "Prg" button is pressed to access the "Q0" screen of the "Menu" branch.
4.7.6.1 Switchingtheuniton/o󰀨
Toswitchtheunitonoro󰀨,fromthe"Q0"screenofthe"Menu"branch,scrollthevariousselectionsofthebranches
usingthearrowbuttonsuntiltheunit"On/O󰀨"selectionappearshighlighted.
Conrmwiththe"enter"buttontoaccessthe"N0"screenwheretheoperatingstateoftheunitisshownwiththe
instruction for changing it.
The unit can be switched on from the keypad depending on whether all the other OK signal inputs for starting are
closed/enabled.
Theunitcanalwaysbeswitchedo󰀨fromthekeypad.
4.7.6.2 Changing from cooling to heating and vice versa
Thechangeofoperationcantakeplaceinoneofthefollowingthreeways,accordingtotheprogrammingrequired
by the customer:
- automatically as the temperature changes in the environment to be controlled;
- manually using the keypad or by remote management;
- by means of the digital input.
When the change is made from the keypad, from the "Q0" screen of the "Menu" branch, scroll the various selections
ofthebranchesusingthearrowbuttonsuntilthe"Sum/Win"selectionappearshighlighted.
Conrmwiththe"enter"buttontoaccessthe"R0"screenwheretheoperatingstateoftheunitisshownwiththe
instruction for changing it.
4.7.6.3 Displaying and changing the operating set points
From the "Q0" screen of the "menu" branch, scroll the various selections of the branches using the arrow buttons
until "Setpoint" appears highlighted. Inside the "Setpoint" loop, there are screens where the various set points can be
changed within factory-set limits.
Conrmwiththe"enter"buttontoaccessthe"S0"screen,wherethecoolingtemperaturesetpointisshown,andto
positionthecursoratthetopleft.The"enter"buttonisusedtoaccesstheeldforchangingthevalue,whichcanbe
doneusingthe"arrow"buttons.Pressthe"enter"buttonagaintoconrmthesetvalueandreturnthecursortothe
top left.
When the cursor is at the top left of the screen, the down arrow button is used to go to the "S1" screen where the
heating temperature set point is shown.
The"enter"and"arrow"buttonscanalsobeusedinthesamewaytochangeandconrmthevalueofthesetpoint
shown in the screen and move on to the next one.
Theotherscreensthatcanbeaccessedifincludedinthecongurationoftheunit,arethe"S5"and"S7"screensfor
theairowratesetpoints.