Unit Heaters - Sigma Products

1 MANUFACTURERS OF HYDRONIC HEATING Products unit Heaters Catalog Tel: (905) 670-3200 Fax: (905) 670-3822 Rev Sigma horizontal and vertical propeller unit Heaters feature a wide performance range for both hot water and steam applications. The performance range is consolidated to reduce the number of different models, simplifying the selection, ordering and installation activities. All single-phase models may be ordered with a low-cost speed-reducer permitting units to be field tuned. Side entry coil connections on model H units permit installation in clearance-critical low ceiling environments.

2 Special coils, constructed with wall Cu-Ni tubes or wall copper, are available for more demanding applications. Furthermore, special explosion-proof motors may be ordered for any unit size. PERFORMANCE All units are designed for maximum airflow and for optimum air distribution. As a result, outlet temperatures are reduced, avoiding unwanted hot spots . Standard units in both horizontal (model H) and vertical configurations (model V) have 12 fpi fin series for enhanced performance. All model H units are equipped with horizontal louvres for simple vertical air distribution adjustment.

3 Optional Louvre Fin Diffusers on model H units permit enhanced air distribution adjustment with either a wide spread of warmth or focussed warm air for greater unit throw. Optional Louvre Cone Diffusers are available on model V units to permit tailored airflow distribution. unit Heaters General Product Overview 1 UUUnnniiittt HHHeeeaaattteeerrrsss Rev 4 ROBUST CONSTRUCTION FEATURES Cabinets are constructed from heavy-duty, cold-rolled, corrosion-resistant steel finished in grey baked enamel. Model H back panels and Model V discharge panels, both have integral inlet collars for additional stiffness.

4 All coils are pressure-tested at 350 psig. unit fans are statically and dynamically balanced and all motors are resilient-mounted resulting in quiet operation. Model H motors are mounted onto sturdy mounts, which also act as fan guards. Inherently stable blades on the model V Louvre Cone Diffuser permit louvre blades to be set at any position without flutter. All louvre blades have rugged retaining springs keeping blades at their set position. These springs permit unlimited blade adjustment over the unit s life without decreasing the blade holding force.

5 SIMPLE INSTALLATION AND MAINTENANCE Model H units are designed with all coil connections to the side(s) of the unit , facilitating access to the rear of the unit . Thus, model H motors and motor/fan assemblies are readily accessible. All model V units are designed with generous spacing between the fan blades, facilitating access to the motor mounting fasteners. This enables easy removal of motor/fan assemblies through the discharge opening on model V units, thus permitting installation close to the ceiling.

6 All H and V units come equipped with an electrical junction box for simple electrical hook-up. unit Heaters General Product Overview 2 UUUnnniiittt HHHeeeaaattteeerrrsss Rev 4 CABINETS Cabinets are constructed from heavy duty cold-rolled corrosion-resistant steel finished in grey baked enamel. Fronts have integral double-folded discharge frame for additional cabinet rigidity. Back panels have integral inlet collars for superior stiffness. Suspension tappings securely fastened to top panel. FANS Fans are designed and selected for high efficiency.

7 Fans are statically and dynamically balanced for quiet, low vibration operation. COILS Standard coils are constructed from heavy wall 5/8 outside diameter copper tube with mechanically bonded aluminum fins. Coils are pressure tested at 350 psig. Coils with copper tubes are suitable for steam applications up to 100 psig. MOTORS Standard motors are 115/60/1, totally enclosed, with automatic thermal overload protection. Standard motors shall be resilient mounted onto fan guards for quiet, low-vibration operation.

8 DIFFUSERS Model H units are equipped with horizontal louvres with individually adjustable blades. The optional louvre fin diffuser consists of vertically arranged, individually adjustable blades for maximum air distribution adaptibility. unit Heaters Horizontal unit Specifications 3 Rev 4 FIGURE 1 DIMENSION DIAGRAM FOR HORIZONTAL unit HEATER WITH SERPENTINE COIL (30H & 40H) FIGURE 2 DIMENSION DIAGRAM FOR HORIZONTAL unit HEATER WITH MULTI-CIRCUITED COIL (47H TO 245H) TABLE 1 HORIZONTAL unit HEATER SPECIFICATIONS DIMENSIONS (IN) MAX THROW (FT) MODEL FIGURE REF.

9 A B C D E F G WT (LB) MAX. MTG. HT (FT) W/ HORIZ. LOUVERS W/ VERT. LOUVERS 015H 1 20 5 8 FIG. 1 27 9 16 19 025H 1 22 8 FIG. 1 36 9 19 24 030H 1 22 8 FIG. 1 40 9 18 23 040H 1 22 8 FIG. 1 40 10 23 29 047H 2 27 48 10 23 29 058H 2 27 48 10 28 35 062H 2 10 71 10 25 30 084H 2 10 76 12 32 40 105H 2 24 10 96 12 38 48 133H 2 10 108 13 40 50 200H 2 10 148 15 50 64 245H 2 10 172 16 54 68 260H 2 10 190 16 56 70 325H 2 10 230 16 60 75 Note.

10 Model 325H motor mount differs from detail shown above in unit Heaters Horizontal unit Dimensions 4 Rev 4 G 1/2 Cu Tubing (5/8 ), sweat connection G NPT Pipe Tap (Male Thread) TABLE 2 STANDARD HORIZONTAL unit Heaters PERFORMANCE DATA 160 F EWT 180 F EWT 200 F EWT 2 PSIG STEAM WATER TD ( F) CAP (MBH) FLOW (GPM) LAT ( F) WPD (FT) CAP (MBH) FLOW (GPM) LAT ( F) WPD (FT) CAP (MBH) FLOW (GPM) LAT ( F) WPD (FT) CAP (MBH) FLOW (#/HR) 030H 10 CFM 420 20 RPM 850 30 1/20HP, 40 030H 10 CFM 520 20 RPM 1050 30 1/20HP.