Daikin UATYQ20ABAY1 Installation, Use And Maintenance Manual

Also see for UATYQ110ABAY1: Installation, Use and Maintenance Instruction Operation manual Operation manual

Daikin UATYQ20ABAY1 Installation, Use And Maintenance Manual Manual pdf 17 page image

Translation from original instructionsInstallation manual17We reserve the right to make changes without any prior notice.UATYQ*Y1Packaged Rooftop4P522680-14.3 Control and safety devicesThe unit is integrally managed by an electronic microprocessor control that, through the various installed temperatureand 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 thedocumentation 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 operationThe basic operation of these units uses a reverse vapour compression cycle to change the thermo-hygrometricconditions of the air in the interior environment. The simplest configuration works in total air recirculation.The refrigeration cycle allows heat to be transferred from a fluid at a lower temperature to a fluid at a highertemperature. Rooftop units are equipped with one or more refrigerant circuits; in cooling mode, air is cooled - and ifnecessary dehumidified - by a finned coil (evaporator); the removed heat is rejected to the outside by another finnedcoil (condenser).In addition to this, the heat pump versions allow the evaporator and condenser roles to be reversed, thereby providingthe heating function.Besides air filtration, other functions are possible, which change according to the configuration and the selectedaccessories: partial air renewal, thermodynamic recovery, supplementary heating by electric heaters, free cooling/free heating.4.5 StructureDepending 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 profiles connected with glassfibre 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-paintedgalvanized sheet-iron casing filled 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 cleaningand sanitizing operations.The non-removable panels are fixed 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 themeasier to remove.4.6 SpecificationsDirect expansion air conditioner with hermetic compressors, evaporating coil with radial fans and condensing coilwith axial fans.The unit is made in two sections that are joined together but functionally separate. One section is for transferring theenergy absorbed from the treated interior environment into the atmosphere. The other section is for air handling andallows air conditioning of the confined environment to be treated.In configurations 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.