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Unico M Series Installation Manual
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Bulletin 30-20 — Page 3© Copyright 2010, Unico, Inc.If installing the unit in an attic, avoid placing the unitabove a bed. The ideal location is above a central hall, acloset, a bathroom, or any normally unoccupied space.The unit can also be installed in a closet, crawlspace, orbasement. If the local codes allow, the unit may be in-stalled in the garage provided the ductwork is wellsealed, especially the return duct. Although the unit isnot designed for outdoor use, it may be located outsideprovided adequate weather protection is used; typically aroof installation requires mounting on blocks with asheet metal cover or cap to protect the unit from rain andextreme weather conditions.Be sure to position the return air box and filter near theunit allowing at least one 90° bend in the return duct forproper acoustical performance (refer to figure 3 for atypical horizontal attic installation). The section on Re-turn Air Ducts in the manual provides more details.All modules except the MC4860 cooling module aredesigned to fit through a 14-inch (356 mm) opening,typical of a joist spaced at 16-inch (406 mm) center dis-tance. The MC4860 module requires an 18.5-inch (470mm) opening. If no access is provided, an opening mustbe cut. It is suggested to use the opening required for thereturn air box, especially in an attic installation. Theopening for the return air box is listed in Table 1. If thejoists or studs are less than 16-inches (406-mm) center-to-center or running the wrong direction it will be neces-sary to cut and header the joists.Return DuctIL00037b.CNVTop View6 (152) MinimumService clearance:30 (762) for MH/MC243042 (1067) for MH/MC48601 (25) MinimumSupply PlenumSecondary Drain PanReturn DuctSupply Plenum1 (25) Minimum5 (127) Minimum for Control Box Cover RemovalAir FlowAir FlowMBxxxxxSide View1 (25) MinimumAll dimensions in inches (mm).Optional Control BoxPlacementOptional Control BoxPlacementMCxxxx MHxxxxxMBxxxxx MCxxxx MHxxxxx6 (152) Minimum20 (508) sideclearance for serviceFigure 2. Minimum ClearancesTable 1. Return Air Box OpeningModels Return Air BoxPart No.Size of openinginches (mm)2430 UPC 01-2430 14 3 8 × 25 ½ (365 × 648)3642 UPC 01-3642 14 3 8 × 30 12 (365 × 775)4860UPC-01-4860 24 3 8 × 30 12 (619 × 775)UPC-01-4860NC 20 3 8 × 30 12 (518 × 775)CoolingModule(MCxxxxx)BlowerModule(MBxxxxx)HeatingModule(MHxxxxx)Return Air Adapter(UPC 104-xxxx)Band (supplied with return air box)Return Air Duct(UPC-04-xx-1)Return Air Box(UPC-01-xxxx-1)PlenumAdapter(UPC 61-xxxx)IsolationPadsSecondaryDrain Pan(UPC 20 or 24)PlatformTypical 10 foot (3.6 m) Return DuctUse at least one 90° bend.IL00039c.CVSControlBoxBandFigure 3. Typical Horizontal Attic Installation |
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