Classroom Unit Ventilator - Trane Heating & Air ...

1 UV-PRC003-ENMay 2006 Classroom unit Ventilator750 CFM to 1500 CFMV ertical Classroom unit VentilatorModel VUV 2006 American Standard Inc All rights reserved UV-PRC003-ENThe Exemplary Trane Classroom unit VentilatorAcademic performance of stu-dents depends, in part, on the ability to create a comfortable learn-friendly surrounding. Being too hot or too cold could hinder a students ability to achieve academic changes, mechanical/build-ing disrepair, and even class atten-dance provide real challenges to HVAC mechanical systems. The only thing consistent about today s class-room is it s ability to constantly change. With this in-mind, Trane intro-duces a NEW Classroom unit Ventilator design to support todays changing en-vironment. Available in a floor mounted configu-ration, the NEW vertical unit Ventilator exceeds todays school or university stringent requirements.

2 By focusing on issues such as noise, indoor air quality , maintenance and cost of ener-gy, Trane has RE-developed a unit Ventilator to meet the Classroom of to-day, and of the Vertical Classroom unit VentilatorBack of unitventilatorUV-PRC003-EN3Ta b l e o fContentsIntroduction2 Features and Benefits4 Application Considerations7 Selection Procedure15 Manual Selection15 Model Number16 General Data18 Arrangements (Inlets/Discharge)19 Arrangements (Falseback/Subbase)20 performance Data21 Coil Selection Chart21 Airflow by Coil22 performance Summary23 Heating /Cooling Performance24 Water Pressure Drop (Curves)76 Correction Factors77 Antifreeze Correction Factors78 Electrical79 Controls81 Control Types81 Wiring87 Sensors95 Jobsite Connections96 Coil96 Piping97 Dimensional Data98 Mechanical Specifications1034UV-PRC003-ENExemplary Fit and FinishEquipment SizeThe vertical unit Ventilator delivers from 750 cfm to 1500 cfm.

3 It is physi-cally sized to fit the replacement or new construction application. Cabinet FinishThe unit cabinetry is made of a durable industrial grade metal to withstand even the most rigorous classrooms. A smooth/glossy, appliance grade paint treatment increases the aesthetics of the equipment while making it durable and easy to maintain. AccessA three panel front access of the unit Ventilator is ergonomically safe for lift-ing/removal, and allows speedy set up during field commissioning. This de-sign allows for the end pocket of the unit Ventilator to be open while the fan (airside) section stays closed. The pan-el design supports a clean fit and finish while providing effortless access for filter access to the unit mounted fan speed/sensor option was developed with the teacher or administrative staff in mind. Access to the sensor may be made through a lock/key, or through an easy open door. Exemplary Install-ability, Service-ability and Maintain-abilitySpacious End PocketsEasy access to piping and controls is made through the roomy equipment end pocket design.

4 The coil headers and drain connections are made with-in the unit chassis, freeing-up valuable space in the end pockets for piping or field add-ins. This also grants a tighter seal to prevent air leakage. The roomy end pocket design (Figure 2) allows for application requirements such as an optional auxiliary drain pan. The auxiliary pan may be placed under the factory or field piping pack-age. Sliding Fan DeckConvenient access to the fan motor and fan wheels for maintenance and serviceability is made in part of the easy-slide design of the unit Ventilator fan board, Figure 3. The fan board as-sembly offers hassle free access to the contractor or maintenance technician. As an added benefit, Trane s unit ven-tilator motors do not include a fan bearing design. This avoids issues re-lated to fan bearing maintenance (oil-ing) and/or unit ventilators utilize an off-the-shelf filter design to reduce or elimi-nate local stocking of filters in the school.

5 See general data section for standard filter : A high efficiency option is avail-able for filter selection. These filters provide greater resistance and dust holding Control BoxThe hinged control box design main-tains easy access to the electrical for connection while supporting less po-tential for damage on the job site from the different construction TransformerA 24-VAC transformer is supplied on every Trane unit Ventilator . The trans-former is rated at 75VA . Reset of the transformer is made through the unit s hinged control box. PipingHydronic piping for the unit Ventilator may be factory installed or field pro-vided. It fits freely inside the unit end pockets, supplying quick hook-up dur-ing the installing phase. The motor-ized valves include a trouble-free, pop-top allowing the maintenance or ser-vice technician access to the motor without removing the valve body from the piping package.

6 Features andBenefitsFigure 1: Exemplary fit and finishFigure 2: Spacious end pocketsFigure 3: Sliding fan boardUV-PRC003-EN5 Exemplary IAQ FeaturesIndoor air quality (IAQ) has become a top priority in Classroom design. Giv-ing students a healthy place to learn and develop is crucial in every school district. It is also crucial to maintaining the building's overall construction and furnishings. Several features of Trane 's unit Ventilator attribute to im-proved IAQ. Removable Drain PanThe unit Ventilator drain pan is dual sloped for effective condensate re-moval. This non-corrosive pan elimi-nates the problems associated with leaking or standing water and is easily removed for of MaintenanceInternal components such as the fan and coils are instantly accessible for visual inspection and cleaning. Main-taining a clean system increases the efficiency of the unit and is important to good, sustainable indoor air quality .

7 This design also places the coils far-ther away from the outside air open-ing, virtually eliminating the potential for coil freezing and the added hassles of nuisance Damper DesignThe outside/return air damper is a one-piece design which is linkage free re-sulting in a superior air seal, Figure 4. This results in lower infiltration of out-side air during off cycles thus lowering the risk of freezing equipment in the winter or the intrusion of humid air into the building during the ActuatorThe OA/RA actuator provides true spring return operation for positive close-off of the OA/RA damper. The spring return system of the actuator closes the outside damper if power is lost to the building. When ordered with factory controls, the actuator is a 3-point floating design. A 2 to 10 VDC actuator is available when other than Trane controls are FilterEach Classroom unit Ventilator comes equipped with a standard-size (off of the shelf, Figure 5) throwaway filter to support job site installation and start-up.

8 However, Trane s unit Ventilator is designed to accommodate the use of a MERV 7 high capacity filter to provide greater filtration of airborne unit ventilators provide a broad range of dehumidification solutions. Active humidity control involves mon-itoring and managing both the dry bulb temperature and the humidity in the Classroom . With this strategy, a re-heat coil is placed downstream of the cooling coil to temper (reheat) the cold, dehumidified air leaving the cooling coil to avoid over-cooling the space. Reheat configurations are avail-able in a variety of coil , the ZN520 controller can be configured to automatically reduce the fan speed at part-load conditions. This helps improve the coincidental dehumidification performance of the unit at part-load, and also lowers sound levels. To help ensure proper ventilation in the Classroom at lower fan speeds, the controller adjusts the outside air being supplied to the big advantage of a unit Ventilator system is the ability to provide energy savings through an economizer cycle.

9 During mild seasons outside air is used to provide "free" cooling, there-by, minimize or eliminate the need to run mechanical cooling equipment. To truly have an effective economizer a unit Ventilator must be able to bring in up to 100% of the design airflow through the outside air damper open-ing. Trane unit Ventilators are tested and certified to exceed the industry standard, as defined by ARI 840, for economizer effectiveness. This en-sures the school will realize the energy savings available through the econo-mizer and Bypass ActuatorThe face and bypass damper actuator incorporates a direct couple design. It provides electronic protection against overload. A limit switch is not includ-ed, nor required as part of the design. When reaching the damper end posi-tion, the actuator automatically stops. The gears can be manually disen-gaged with a button on the andBenefitsFigure 4: OA insulated damperStandard-sizedThrowaway filtersFigure 5: Standard sized filtersOA/RA actuator6UV-PRC003-ENExemplary AcousticsQuiet systems are extremely impor-tant in today's classrooms.

10 Trane of-fers many different system solutions to balance the requirements of sound, cost, IAQ and efficiency. Trane 's NEW vertical unit Ventilator takes a compre-hensive approach to delivering one of the quietest units and Blower Motor AssemblySeveral innovative ideas have gone into the quiet design of Trane 's new vertical unit Ventilator . The fans diam-eters have been maximized to reduce the motor rpm and thus lower the noise, while still maintaining the cfm requirements to support ventilation and capacity requirements. The unique direct-drive fan and blower de-sign diminishes vibration from occur-ring further ensuring quiet operation, Figure 6. Multi-Speed ControlTrane provides the capability to vary airflow for suitable applications. This lowers the sound in the space and im-proves the dehumidification in the cooling season at part-load. With field installed controls, this is accomplished with a unit -mounted manual fan speed switch, allowing either 2 or 3-speed control.