VENTILATION - Rosemex

1 INDUCTIONUNITR osemex Products VENTILATION10961 INDEXUnit features .. 1 - 4 Nomenclature .. 5 system comments .. 5 Selection procedures .. 5 - 6 Vertical selection tables .. 7 - 12 Low Vertical selection tables .. 13 - 18 Horizontal selection tables .. 19 - 24 Correction factors (tables 4 - 8) .. 25 Dimension drawings and tables .. 26 - 28 ARI standards rating tables .. 29 - 30 Unit weights .. 31 Mechanical specifications .. 31Z BAR MOUNTING BRACKETS AND PIPE HANGERSR osemex designed mounting brackets and pipe hangers sim-plify the installation process by providing space for pipingbehind the coil on vertical units. There is a built-in pipe chaseon low vertical units Designed to work together, the pipehanger fits into a slotted section of the mounting bracket andhangs downward. Pipe hangers are made of heavy steel wireand are constructed to support supply and return piping (pip-ing can range up to 3/4 in diameter with 1 insulation).

2 Z barmounting brackets secure to the wall assuring solid unit instal-lation. design FEATURES MAINTAINEFFICIENT COMFORT INSTALLATION TIMEAND COSTSThe Rosemex Induction Unit utilizes the induction principle toeffectively blend clean external air, conditioned in a central sta-tion air handler, with filtered room air for steady seasonal com-fort control. This Rosemex system is ideal for application inlarge office buildings and hospitals where the need for aperimeter system is necessary to save space while maintain-ing comfortable internal air in over 1800 sizes, coil and nozzle combinations andarrangements, Rosemex Induction Unit provides the engineerwith the most practical selection, in terms of initial cost andenergy conservation, for each individual situation. All modelsinclude design features that reduce installation costs and pro-vide low operating sound system installation costs are minimized through uniquedesign features developed by Rosemex .

3 Both vertical and lowvertical units include an integral pipe chase which saves spacefor pipe installation. The chase requires no structural changesand saves the material and labor costs of constructing a sep-arate pipe chase in the field. An additional Z bar bracket isrequired to provide space for the integral pipe chase on thevertical circular primary air connections and discharge ductcollars speed up installation because of their compatibility withprimary air supply ducts and cabinet discharge Rosemex Induction Unit features include a readilyaccessible, but tamper-proof, push-pull damper which simpli-fies system balancing; an optional drain connection; and fieldreversible coil for installation vertical and low vertical units can be either floor or wallmounted. Mounting brackets, designed by Rosemex , add flex-ibility to installation requirements. Coil connections aredesigned for maximum clearance between the supply andreturn allowing enough space to make sweat or flare connec-tions quickly and features, combined with the rugged unit construction ofthe vertical, horizontal and low vertical models, enable the con-tractor to furnish a quality installation while reducing time FEATURES AND OPTIONS2 THREE BASIC MODELSV ertical: 16-84 in 4 incrementsLow Vertical: 20-84 in 4 incrementsHorizontal: 16-60 in 4 increments COIL OPTIONSS tandard (A) and high capacity (H) coils; standard and highcapacity double coils (AA and HH).

4 CODE COMPLIANCEB uilt to ARI standards GRAVITY HEATING CAPACITIES(HPV and HPL) Up to 99 BTUH/ ITD ACCESSORIESLint screen: single plyPermanent Filter: multiple plyWall Mounting StripsFlare Coil Connections with or wilhout air ventIntegral Pipe Chase (standard on low vertical units)Pipe HangersDRAIN CONNECTION (Optional) AND FLOORMOUNTING HOLES permits easier installation and cleaningDUCT COLLAR DISCHARGE fits standard 4-inch grille,eliminates adaptorsINTEGRAL PIPE CHASE saves space,labor and materialsCIRCULAR PRIMARYAIR RUNOUT fits directly to unit,no transition required3 QUIET OPERATION MEETS CONTEMPORARY SOUND POWER DEMANDSC ontemporary architecture has resulted in structures thatrequire more efficient heating and cooling to maintain season-al comfort conditions. Paralleling this need for high standardoperation, the requirement of quieter operating sound levelshas become prominent in relation to comfort and end result shows a major consideration toward operatingsound levels when selecting induction equipment.

5 To comply with this new demand, Rosemex Induction Unit hasbeen designed to meet the most stringent acoustical require-ments. UNIQUE INSULATED AIR PATHA major element of Rosemex Induction Unit's low operatingsound level is a unique, acoustically lined, 1/2" by 6" air pas-sage downstream from the balancing damper. A 90 degreeturn against insulating material and the narrow shape of the airpassage effectively dampen air noise. BALANCING DAMPERThe self sealing balancing damper guards against high pressureair leaks, yet is easily adjustable for system balance. Cast zincunit ends eliminate the possibility of leaking air seams and airbypass, reinforcing the concept of low operating sound levels. ACOUSTICAL SELECTION TABLESR osemex Induction Unit s reputation of quiet operation isbacked by tables found later in this catalog. The simplicity ofthe table information and layout aids the designer in selectinga unit whose capacity will meet project sound requirements.

6 UNIT OPERATIONA constant volume of high velocity, preconditioned primaryair provides the motive power in an induction system . Itenters the internal section of the unit plenum and passesthrough the balancing damper. The damper is adjusted atstart-up to provide the required nozzle static pressure. Afterthe damper, the air passes through a sound attenuating com-partment to the nozzle strips. When this high velocity airpasses through the nozzles, it creates an area of reducedpressure behind the secondary water coil. This reduced pres-sure induces room air through the unit coil. The coil controlsthe heating and/or cooling of the room air. A secondary watercontrol valve, regulated by the space thermostat, varies unitcapacity to offset room loads. The tempered room air mixeswith the primary air in the discharge stack and is then emit-ted into the room. The primary air provides required ventila-tion and, by varying moisture content, maintains humidityconditions during any unique insulated air path of Induction Unit is diagramedbelow.

7 High velocity air passes through the primary airdamper, turns against acoustical material, flows into a nar-row passage that has a high ratio of absorption to cross sec-tion, and then through the nozzles. The shape and insulationof this air path removes a major portion of the air turbulencesounds. 4 COIL OPTIONS PROVIDE APPLICATION FLEXIBILITYSINGLE A(A)SINGLE H(H)DOUBLE A(AA)DOUBLE (H)(HH)SINGLE A(A)SINGLE H(H)DOUBLE A(AA)DOUBLE (H)(HH)SINGLE A(A)SINGLE H(H)DOUBLE A(AA)DOUBLE (H)(HH)Horizontal (HPH) UnitVertical (HPV) UnitLow Vertical (HPL) Unit5 GENERAL COMMENTS ON system DESIGNIt is generally accepted that minimum total system cost isachieved when minimum amounts of primary air and sec-ondary water are used. However, the unit must be selected ator above inches nozzle static pressure to insure maxi-mum nozzle efficiency and relative ease of system air side coil pressure drop should be kept under 17 feet toreadily balance the system .

8 Although minimizing these parameters requires longer induc-tion units to match module loads, offsetting economies arerealized in piping, installation, pumps, high velocity ductwork,and air handling equipment. Normally these energy savingoperating economies more than compensate the owner for thehigher first cost of longer units. Because of this potential sav-ings, unit selection should begin by determining the longestunit that can be installed in a given module. Considerationmust be given to minimum nozzle static and water pressuredrops, and the space required for piping, valves, and the pri-mary air connection. Then the temperature and minimumamount of primary air and secondary water needed to satisfydesign load conditions, VENTILATION requirements, changeovertemperature, sound level, and desired humidity can be final-ized. In a changeover system consideration should also be given tothe ability of the unit to offset heat losses in the evening hoursand on weekends by means of gravity (air off) heating.

9 If suffi-cient capacity is available it will not be necessary to operatethe primary air system during these hours resulting in furtherenergy and cost PROCEDUREThe tables on pages 7-24 contain unit capacities and noise cri-teria information based on the following Primary air sensible cooling capacity: T (Room - PA) = 20 Temperature difference between room air and primary air capacity for 20 T is conveniently shown in theselection chart. (Second column from left). For other than20 T, the primary air capacity can be computed as Capacity = CFM X X Secondary coil cooling capacity is based on a 25 T(Room-Entering water temp). For other than 25 T see thefactors in table 4. The capacity factors for other than 25 Tare computed as follows: X where X = the degree T other than 25 .3. Secondary coil capacity is based on a water flow rate of for all units 16 to 72 , GPM for 76 to 84 units.

10 Seetable 5 for factors at other flow Noise criteria (NC) levels for medium room are based onattenuation effects of , , , , , and inthe 2nd through 8th octave Free area of discharge and inlet grilles must be in accor-dance with table 9, page 29, to obtain catalog correction factors are required, they are to be mul-tiplied by the catalog capacity to get the actual SELECTIONThe Rosemex Induction Unit's function is to offset module heatgain or loss. The design engineer should complete a schedulewhich will specify the maximum cooling and heating loadsrequired of each module. The combination of primary air andsecondary coil capacities must off-set the modular loadthroughout the IOOI1,2 3 4,5 67 8,9 10 11 12 13 14 15 16 HIGH PRESSUREMODEL:L - Low VerticalV - VerticalH - HorizontalUNIT COIL LENGTH:HPV - 16 - 84 HPL - 16 - 84 HPH - 16 - 60 NOZZLE SERIES:A - *, B - , X - ,C - , Y - , D - ,Z - , E - , S - SpecialMAIN COIL SUPPLY:R - Right handL - Left handS - Split coil (2 pipe)* Note: Open nozzle per SCREEN.