Electric Unit Heaters Model UHAA Model UHWA Model UHRA Model UHXA Model UHEC Model UHCA August 2005 UH-PRC003-EN
Introduction Introduction Electric unit heaters have been a traditional means of heating hard-to-warm spaces for many years. Their uncomplicated approach in auxiliary heating make them easy to install and maintain. Their versatile characteristics allow Trane’s electric unit heaters to fill nearly every heating application gap, while their structural integrity makes them a reliable heat source to blend into today’s building décor. Trane’s electric unit heaters are available in 6 variations.
Contents UH-PRC003-EN Introduction 2 Features and Benefits 4 Application Considerations 13 Selection Procedure 14 Model Number 15 General Data 19 Control Wiring 29 Dimensional Data 32 Options 39 Mechanical Specifications 42 3
Features and Benefits Electric Unit Heaters • Thirty-seven models to choose from ranging from 3.3 to 50 kW. Available for 208, 240/208, 277 or 480-volt operation. • One unit can be used for either horizontal or vertical discharge. • Specially designed inlet louvers, venturi and outlet diffuser provide uniform air temperature and throw characteristics. • Single-phase units, easily converted to three-phase power, are available in 3.3 to 10 kW for 208 and 240-volt operation.
Features and Benefits Model UHEC Mounting the unit is easily accomplished with the use of hanger rods connected to weld nuts on the unit casing. An accessory mounting bracket is available for single-point mounting. Field installed accessories such as built-in thermostats, disconnect switches and summer fan switches are provided with spade terminals for easy installation to a singlepoint terminal board.
Features and Benefits Model UHRA Hose-Down Electric Unit Heaters Trane UHRA hose-down electric unit heaters are constructed for use in areas that require washing or hosing of equipment due to a dirty or dusty industrial environment in non- hazardous locations. The totally enclosed, watertight casing made with corrosion-resistant material, makes the unit ideal for industrial heating applications.
Features and Benefits Model UHXA Trane Explosion-Proof Electric Unit Heaters Pressure Relief Valve Rated at 200 PSI Epoxy Coated 14-Gauge Cold Rolled Steel Cabinet Spiral Aluminum FinnedTubular Steel Heat Exchanger Core Liquid Filled Operation (see page 3) 14-Gauge Steel Adjustable Louvers with Minimum Position Stops Cast Aluminum Control Enclosure with Oversized Opening Built-In Load Carrying Contactor Protective Heating Element Cover Copper Sheathed ImmersionType Heating Element UH-PRC003-EN Etch
Features and Benefits Liquid to air heat exchanger with low watt density heating elements in ethylene glycol solution that provides freeze protection to -45°C. Model UHXA Designed for rugged industrial applications in hazardous locations where the possibility of explosion or fire exists due to the presence of certain flammable gases, vapors, powdered metals or dusts. • Permanently sealed, liquid to air, finned tube heat exchanger core.
Features and Benefits Heavy-Duty Wall Heaters Trane heavy-duty wall mounted electric forced-air unit heaters are architecturally styled in a vandal- resistant design for all commercial, institutional and many industrial applications. They are particularly suited for schools, office buildings, dormitories, stores, hospitals and other public buildings. The high capacity and wide range of voltage/phase and control systems provides application versatility to meet most installation requirements.
Features and Benefits Model UHWA Series 20 and 50 • Architecturally styled and vandal- resistant for schools, churches, stores, office buildings, transportation terminals, dormitories, hospitals. • Use in vestibules, entrance ways, lobbies, corridors, stairways, reception rooms, rest rooms, offices. • Simple application design — Wide selection of built-in, factory installed and wired, pre-engineered control systems. Saves design and on-the-job time.
Features and Benefits Model UHCA Series 70 and 80 Commercial and Industrial Ceiling - Mounted Fan Forced Heaters Series 70 and 80 Features • Crisp, unique styling to blend into any architectural design — unit designed for long life and warranted for five years. • Higher velocity ceiling-mounted heater gets air down to warm those hard to heat areas where public accessibility is not desired or where wall area is restricted.
Features and Benefits Model UHAA Series 3320 Architectural Quality • Built - in tamper resistant thermostat • Built - in tamper resistant disconnect switch • Richly styled, rugged grille • Whisper-quiet sound level • Fan delay • Decorator designed for functional beauty and versatility. • Five-year element, limited warranty • UL listed Optional Accessories 3320EX33 Surface Mounting Adapter Factory-Installed Accessories Suffix R Day/Night Relay Rugged Grille — Grille made of 18 gauge (1.
Application Considerations Abbreviated descriptions of UL classes, groups and divisions. Before selecting any heater for a particular application, refer to Article 500 as well as other standards referenced in the National Electric Code. • Class I: Equipment does not have surface operating temperature in excess of the ignition temperature of the specific gas or vapor. • Class II: Equipment does not have surface temperature greater than the ignition temperature of the specified dust.
Selection Procedure Model UHEC, UHRA, UHXA, UHWA, UHCA, UHAA Calculate the heating loads using the NEMA, ASHRAE, or other accepted heating load calculation method. Determine the quantity and size of unit heaters to be used.To maintain uniform temperature and recommended air circulation, it is suggested that cfm should be adequate to accomplish three air changes per hour. For maximum comfort, the use of smaller units with lower airflows is suggested to provide more uniform temperature and even airflow.
Model Number Description Model UHEC, UHRA, UHXA Model UHEC Model UHRA Model UHXA Digits 1-3 — Electric Unit Heater Digits 1-3 — Electric Hose-Down Corrosion Resistant Unit Heater Digits 1-3 — Electric Explosion-Proof Unit Heater Digit 4 — Development Sequence Digit 4 — Development Sequence Digits 5-6 — Unit Capacity 03 — 3.3 kW 05 — 5 kW 07 — 7.
Model Number Description Model UHWA Digits 1-3: Unit Type UHW = Electric Wall Mounted Unit Heater Digit 4: Development Sequence Digits 5 - 6: Unit Capacity 02 = 2 kW 03 = 3 kW 04 = 4 kW 05 = 5 kW Digit 7: Element Phase 1 = 1 Phase/60 Cycle 3 = 3 Phase/60 Cycle Digit 8: Element and Motor Voltage A = 208 Volt B = 240 Volt C = 277 Volt Digit 9: Unit Series 2 = Unit Series 20 5 = Unit Series 50 Digit 10: Current Design Sequence Digit 11: Built-in Thermostat 0 = None T = Unit Mounted Tamper Proof Thermostat Dig
Model Number Description Model UHCA Digit 1-3: Unit Type UHC = Electric Ceiling Mounted Commercial Heater Digit 4: Development Sequence Digits 5-6: Unit Capacity 02 = 2 kW 03 = 3 kW 04 = 4 kW 05 = 5 kW Digit 7: Element Phase 1 = 1 Phase/60 Cycle 3 = 3 Phase/60 Cycle Digit 8: Element and Motor Voltage A = 208 Volt B = 240 Volt C = 277 Volt Digit 9: Unit Series 2 = Surface Mounted, Unit Series 70 5 = Recess Mounted, Unit Series 80 Digit 10: Current Design Sequence Digit 12-13: Unit Mounted Thermostat T1 = Si
Model Number Description Model UHAA Model UHAA Digit 9: Built-in Thermostat T = Unit Mounted Tamperproof Thermostat Digit 1 - 3: Unit Type UHA = Electric Architectural Wall Heater Digit 10: Current Design Sequence Digit 4: Development Sequence Digit 11: Unit Mounted Disconnect D = Unit Mounted Disconnect Switch Digits 5–6: Unit Capacity 15 = 1.5 kW 02 = 2 kW 03 = 3 kW 04 = 4 kW 48 = 4.
General Data Model UHEC Table GD-1 — Model UHEC Electrical Data Unit Model Number UHEC-031A0C0 UHEC-031B0C0 UHEC-031AACA UHEC-032A0C0 UHEC-032B0C0 Capacity kW Btu/Hr Rating (000) 3.3 11.2 3.3/2.5 11.2/8.5 3.3 11.2 3.3 11.2 3.3/2.5 11.2/8.5 Element and Motor Voltage 208 240/208 208 208 240/208 UHEC-031C0C0 UHEC-031CACA UHEC-033DACA UHEC-031BACA UHEC-032AACA UHEC-032BACA 3.3 3.3 3.3 3.3/2.5 3.3 3.3/2.5 11.2 11.2 11.2 11.2/8.5 11.2 11.2/8.
General Data Model UHEC Table GD-2 — Model UHEC — Metric Unit Heater Capacity kW Rating 3.3 5.0 7.5 10 15 20 25 Motor Data Watts R.P.S. 6 25.8 6 25.8 14 25.8 14 25.8 37 25.8 37 25.8 62 25.8 25 480/3 Mtr 30 50 25.8 62 25.8 30 480/3 Mtr 40 50 25.8 186 25.8 40 480/3 Mtr 50 149 25.8 186 25.8 50 480/3 Mtr 149 25.8 Airflow at Outlet (L/S) 189 189 330 330 519 519 944/ 849 944/ 849 944/ 849 944/ 849 1463/ 1321 1463/ 1321 1463/ 1321 1463/ 1321 Approx. Air Rise @ Outlet (C) 14.4 22.2 18.9 25.
General Data Table GD-4 — Air Delivery Data Table GD-3 — Model UHRA Unit Model Number kW UHRA Rating 031AAAT 033AAAT 031GAAT 033GAAT 3.3 031CAAT 033DAAT 033FAAT 051AAAT 053AAAT 051GAAT 053GAAT 5.0 051CAAT 053DAAT 053FAAT 071AAAT 073AAAT 071GAAT 073GAAT 7.
General Data Model UHRA Table GD-5 — Air Delivery Characteristics Heater Capacity (kW Rating) 3.3, 5.0 7.5 10, 15 Velocity of Air Movement (FPM) Distance from Heater 6 Ft. 12 Ft. 24 Ft. (1.8 M) (3.7 M) (7.3 M) 210 80 25 (12.8 M/S) (4.9 M/S) (1.5 M/S) 270 95 45 (16.5 M/S) (5.8 M/S) (2.7 M/S) Throw Distance 36 Ft. (11 M) 46 Ft. (14 M) Weight 45 lbs. (20.4 Kg) 55 lbs. (24.9 Kg) Throw Distance 55 Ft. (16.8 M) 65 Ft. (19.8 M) Weight 85 lbs. (39 Kg) 130 lbs.
General Data Model UHXA Table GD-8 — Model UHXA Unit Size 3 kW 5 kW 7.5 kW 10 kW 15 kW 20 kW 25 kW Model No.
General Data Model UHXA Table GD-9 — Model UHXA with 120 Volt Control Voltage Unit Size 3 kW 5 kW 7.5 kW 10 kW 15 kW 20 kW 25 kW Model No.
General Data Model UHXA Table GD-11 — Model UHXA Unit Size Capacities Available UL Listing ULTemperature Code CFM @ 70°F (21°C) L/S @ 21°C (70°F) FPM MM/S AirTemperature Rise Horizontal Throw Max. Mtg. Height from floor Max.
Model UHWA Series 20 and 50 General Data Table GD-12 — Electric Wall-Mounted Unit Heaters — Series 20 Watts 2000 Watts 3000 Watts 4000 Watts 5000 Watts Model No. UHWA 021A2AT 021B2AT 021C2AT 031A2AT 031B2AT 031C2AT 041A2AT 041B2AT 041C2AT 043A2AT 043B2AT 051A2AT 051B2AT 051C2AT 053A2AT 053B2AT Order No.
Model UHCA Series 70 and 80 General Data Table GD-14 — Series 70 Electric Ceiling Surface Heaters Watts 2000 3000 4000 5000 Model Order No. No.
Model UHAA Series 3320 General Data Table GD-16 – Electrical Specifications and Ordering Information Unit No. UHAA151ETAD UHAA151BTAD UHAA151ATAD UHAA151CTAD UHAA021BTAD UHAA021ATAD UHAA021CTAD UHAA031BTAD UHAA031ATAD UHAA031CTAD UHAA041BTAD UHAA041ATAD UHAA041CTAD UHAA481BTAD UHAA481ATAD UHAA481CTAD Volts 120 240 208 277 240 208 277 240 208 277 240 208 277 240 208 277 kW Watts Btu/Hr Output Wgt Lbs Wgt Kg 1.5 1500 5119 22 10 2.0 2000 6825 22 10 3.0 3000 10240 22 10 4.
Control Wiring The Trane heaters have been designed for explosion-proof service with single and 3-phase inputs of 208, 240, 480 and Model UHXA 600 volts. They meet stringent UL requirements. However, it is essential that correct installation procedures be followed to eliminate all potential hazards arising from faulty installation.
Controls Model UHWA Series 20 and 50 Control Systems Type of Control Built-in thermostat control Wall mounted thermostat, heater voltage, line duty. For single phase heaters use SP or DP (DP if used as a disconnect) of sufficient capacity. For three-phase heaters use TW1512 which cycles two poles simultaneously. Wall mounted, heater voltage, pilot duty, one or more heaters. Heater has built-in contactor with heater voltage coil. Wall mounted, 120 V, pilot duty, one or more heaters.
Control Wiring Optional Control Systems • Heaters operated from wall mounted, line voltage, heavy-duty thermostats. • Direct Line Voltage. More than one heater may be controlled from one thermostat providing total amperage of heaters does not exceed thermostat rating. • Single-Phase Heaters. Use any good quality single pole thermostat of sufficient ampacity. Use double pole thermostat if positive off is desired. Knob operated and tamper resistant type available. • Three-Phase Heaters. Use TW1512.
Dimensional Data Horizontal Air Discharge Unit Casing Vertical Air Discharge Weld-Nut Location Dimensions, Inches (mm) Unit Casing (Inches) Unit Size 3.3-5 7.5-10 15-20 25-50 Model UHEC H W D 17 3/4 (451) 14 15/32 (368) 6 1/2 (165) 24 5/16 (618) 21 1/2 (546) 6 1/2 (165) 28 11/16 (729) 21 1/2 (546) 6 1/2 (165) 34 (864) 29 1/4 (743) 10 1/16 (256) Unit Size 3.3-5 7.
Dimensional Data Model UHEC Vertical Air Discharge Louver Cone Diffuser Louver Cone Diffuser Dimensions, in. (mm) Unit Size 03 & 05 07 & 10 15 & 20 25-50 UH-PRC003-EN P N/A 11 5/8 (295.3) 11 5/8 (295.3) 17 1/8 (435.0) R N/A 14 1/4 (362.0) 14 1/4 (362.0) 21 (533.4) S N/A 6 1/2 (165.1) 6 1/2 (165.1) 9 3/4 (247.7) T N/A 1 3/4 (44.5) 1 3/4 (44.5) 2 3/4 (69.
Dimensional Data Model UHRA Dimensions shown in ( ) are in millimeters 3 kW thru 15 kW 20 kW thru 48 kW Unit Size 03,05,07 10,15 20,25,30 40,48 34 A 12” (305) 14” (356) 16” (406) 18” (457) B 18” (457) 19” (483) 27” (686) 31” (787) C 19 3/4” (502 21 3/4” (552) 28 3/4” (730) 30 3/4” (781) Dimensions, in. (mm) D E 15 1/4” (387) 16 1/2” (419) 15 1/4” (387) 18” (457) 19 1/2” (495) 17 1/2” (445) 19 1/2” (495) 19 1/2” (495) 6 6 6 6 Ft. Ft. Ft. Ft. F (1.8 (1.8 (1.8 (1.
Dimensional Data Model UHXA Physical Dimensions, in. (mm) Unit Size 3-5 7.5 kW 10 kW 15-20 25 kW A 17 3/4” 20 3/4” 24 3/4” B 22 3/8” 26 3/8” 30 3/8” 3 PH. 19 3/4” 20 3/4” 22 1/2” C Unit Size 3-5 7.5 kW 10 kW 15-20 25 kW A (450.9) (527.1) (628.7) B (568.3) (669.9) (771.5) 3 PH. (501.7) (527.1) (571.5) 1 PH. 20 5/8” 21 5/8” — D 16 1/4” 20 1/4” 24 1/4” E 10 1/2” 11 1/2” 12 1/2” F 14” 18” 22” G 3” 4” 4 1/2” 1 PH. (523.9) (549.3) — D (412.8) (514.4) (616.0) E (266.7) (292.1) (317.5) F (355.
Dimensional Data Model UHWA Series 20 and 50 Dimensions shown in are inches (mm) Typical Heater Element, Motor, “Zero Voltage Reset” Thermal Cutout Control System Wiring Diagrams 36 UH-PRC003-EN
Dimensional Data Model UHCA Series 70 and 80 Series 70 — Surface Mounted Note: Dimensions shown in in inches (mm) Series 70 — Surfaced Details Series 80 — Recessed Mounted UH-PRC003-EN 37
Dimensional Data Model UHAA Series 3320 Dimensions are shown in inches (mm) 38 UH-PRC003-EN
Options Model UHEC Dust Shield Horizontal Heater and Used On Wall Brackets Dust Shield 3.3 kW A5105 DS5105 7.5 kW to 20.0 kW A5120 DS5120 25.0 kW to 50.0 kW A5150 DS5150 OSHA Fan Guards Stratification Control Option Electric UHEC unit heaters are an efficient way to provide quick, efficient heat when and where it’s required. A wall thermostat with an optional stratification thermostat makes the Trane unit heater even more energy efficient.
Options Model UHEC Unit-Mounted Room and Stratification Thermostats Unit-mounted thermostats for field installation are available in low voltage (24V) for either single or two-stage operation, and line voltage (up to 277V) for single-stage operation. All room thermostats have an adjustable temperature setting range of 45°F (7.2°C) to 90°F (32.2°C); and the stratification thermostat has a range of 70°F (21.1°C) to 130°F (54.4°C).
Options Mounting Bracket Kits Trane makes three mounting kits available — the HLPM Pipe Mounting Bracket, the HLHM Ceiling Mounting Bracket, and the HLWM Wall Mounting Bracket. Each of these is illustrated and described on page 20 of this brochure.To order, specify the type of bracket with the heater model desired.
Mechanical Specifications Heaters shall be installed and wired in accordance with the manufacturer’s recommendations and applicable national and local codes. Casing Casings fabricated of die-formed, heavy gauge steel and finished in high gloss, baked enamel. Supply air shall be drawn through a stamped louver periphery evenly across the heating element, and discharged through an outward drawn venturi. Adjustable discharge louvers shall be provided to control the direction of airflow.
Mechanical Specifications Heaters shall be installed and wired in accordance with the manufacturers recommendations and applicable national and local codes. Casing The casing that houses the heating elements shall be fabricated from 16-gauge 304 stainless steel with a 304 stainless steel outlet protective grille and angled outlet louvers to insure uniform air flow and delivery temperature across the entire face of the heater.The inlet grille shall be chrome plated.
Heaters shall be installed and wired in accordance with the manufacturer’s recommendations and applicable national and local codes for use in hazardous classified locations and shall be UL listed. UL Classes For Class I, Group D, Divisions 1 and 2 and Class II, Groups E, F and G, Divisions 1 and 2. Abbreviated descriptions of UL classes, groups and divisions. Before selecting any heater for a particular application, refer to Article 500 as well as other standards referenced in the National Electric Code.
Mechanical Specifications Contractor shall supply and install heavy-duty, wall-mounted forced-air electric unit heaters of the wattage, voltage and phase as indicated on the plans. The heater is designed to provide an even distribution of heated air to the space by drawing return air in the periphery of the heater across the element, which shall then be discharged from the center section of the heater by means of an electric motor and axial flow fan blade.
Mechanical Specifications Contractor shall supply and install heavy duty ceiling-mounted forced-air electric heater(s) of the wattage, voltage and phase as indicated on the plans. The heater is designed to provide an even distribution of heated air to the space to be heated by drawing return air in the periphery of the heater, across and through the element and be discharged from the center section of the heater by means of an electric motor and axial flow fan blade.
Mechanical Specifications Furnish and install heavy-duty forced air wall heaters, Series 3320 where specified. Heaters are architectural styled, constructed of a 18-gauge (1.2 mm thickness) steel housing with a 14-gauge (1.9 mm thickness) extruded aluminum frame. The rugged steel grille and heater box are painted with a rust resistant dark brown baked enamel color finish. Rough-in dimensions of 19 3/16” (487.4 mm) high x 14 3/16” (360.4 mm) wide x 4” (101.6 mm) deep.
Literature Order Number UH-PRC003-EN File Number PL-UH-000-UH-PRC003-08/05 Supersedes UH-PRC003-EN-12/01, UH-DS-6-04/98 Trane A Business of American Standard Companies www.trane.com For more information contact your local district office or e-mail us at comfort@trane.com Trane has a policy of continuous product and data improvement and reserves the right to change design and specifications without notice.
