Trane UHWA, UHAA, UHRA, UHXA, UHCA Catalogue
...
Electric Unit Heaters
Model UHWA
Model UHAA
Model UHRA
Model UHCA
Model UHXA
Model UHEC
UH-PRC003-ENAugust 2005
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. The following chart presents a brief overview of the different
electric unit heater models Trane offers.
Model
UHEC 3 to 50 kW
Description
Horizontal and Vertical Spot
Heating Electric Unit Heater
Applied as an auxiliary heat source
in walkways, stairways, vestibules,
and entrances. The horizontal and
vertical spot heater may be used in
commercial, industrial and
institutional applications.
Application
UHRA 3 to 48 kW
UHXA 3 to 25 kW Explosion-Proof Electric Unit Heater Designed for hazardous locations, the
UHCA 2 to 5 kW
UHWA 2 to 5 kW Heavy Duty, Wall Mounted
Hose-Down, Corrosion-Resistant
Electric Unit Heater
Commercial, Ceiling-Mounted
Electric Unit Heater
Electric Unit Heater
Series 20 and 50
Used in industrial applications where
dirt or dust may be extensive. The
totally enclosed, watertight casing is
corrosion-resistant for non-hazardous
locations.
UHXA model may be applied where
flammable gases, vapors, powdered
metals or dust may be present.
The surface- or recessed mounted
model may be applied in restricted
areas or where wall space is limited.
This may included vestibules, lobbies,
rest rooms, small-offices or guard
buildings.
Suited for public buildings such as
schools, stores, offices, dormitories,
hospitals and transportation
terminals.
UHAA 1.5 to 4.8 kW
© 2005 American Standard Inc. All rights reserved.
Architectural Wall Mounted
Electric Unit Heater
The rugged construction and
attractive design of the UHAA model
make them appropriate for offices,
lobbies, and reception areas for
schools and dormitories.
UH-PRC003-EN
Contents
Introduction
Features and Benefits
Application Considerations
Selection Procedure
Model Number
General Data
Control Wiring
Dimensional Data
Options
Mechanical Specifications
2
4
13
14
15
19
29
32
39
42
UH-PRC003-EN
3
Features and
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.
Two-speed fan operation standard on
•
25 kW units and above.
Meets all requirements of UL listing
•
standard 1278 when installed as
directed.
UHEC electric unit heaters are ideal for
applications ranging from new
construction to auxiliary heat to
renovation. They are available in 37
models ranging from 3.3 kW to 50 kW. In
addition to a wide capacity range, each
compact, attractive unit can be mounted
in either a horizontal or vertical discharge
arrangement.
Benefits
Flexibility
The Trane electric unit heater shows its
flexibility in installation and operation.
Intended for industrial, commercial or
institutional use, the Trane electric unit
heater is available for 208 to 480-volt,
single or three-phase operation. Units
from 3.3 to 10 kW for 208 and 240-volt
operation may be converted easily from
single to three-phase operation in the
field. Two-speed fan operation on 25 kW
units and above provides greater airflow
flexibility.
Uniform Air Distribution
The Trane unit heater uniformly directs
the air to exactly where it’s needed. A
specially designed deep-drawn venturi
assures uniform air distribution. The
outward-drawn venturi channels the air
forward for maximum, uniform air throw.
Outlet diffusers are provided to properly
direct the heated discharge air.
In order to minimize the potential for hot
spots on the heating coil, inlet louvers
evenly distribute intake air over the entire
heating element.
Model UHEC
Trane electric unit heaters are designed
with totally enclosed, permanently
lubricated industrial motors. The
air-over-motor design reduces operating
temperatures, promoting long motor life.
Thermal overloads provide additional
protection for major circuits, in case
normal operating temperatures are
exceeded.
Quick and Easy
Low-Cost Installation
Installation time and costs are minimized.
Compact and completely factory wired,
the Trane electric unit heater requires
only a single-source power supply
connection. The units are available with
factory installed 24-volt control
transformers and contactors.
Outlet Louvers — Individually adjustable
from 30° up to 45° down.
Motor and Fan — Totally enclosed,
permanently lubricated, sealed bearing,
all-angle motor and fan combination
through 20 kW and two-speed permanent
capacitor-type motor on 25 through 50
kW units.
Contactors — All units 25 kW and larger
are equipped with two contactors and
two element banks for either single or
two-stage heating operation.
Fusing — Element, motor and transformer
primary fusing are factory installed and
wired where required to NEC. Branch
circuit fusing installed where required on
48 amps and up.
LISTED
Casing — Die-formed heavy-gauge steel
with baked enamel finish.
Intake Louvers — Designed to provide
uniform air distribution across entire
heating element.
Element — High mass, all steel finned,
tubular heating element.
Transformer — 24-volt control circuit for
closer temperature control and added
safety. Standard on most models,
optional on 3.0 and 5 kW 208, 240/208,
277-volt models.
Thermal Overloads — Automatic reset
thermal cutouts disconnect motor and
element in the event normal operating
temperatures are exceeded.
Terminal Panel — Single-point terminal
board wiring for easy control accessories
installation.
Access Panel — Full width access panel
secured by quarter-turn fasteners.
UH-PRC003-EN4
Features and
Benefits
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.
Reliable Operation
Trane electric UHEC unit heaters operate
reliably when installed and operated as
directed. In addition to meeting all
requirements of UL listing standard 1025,
the heating element is backed with a fiveyear warranty.
Easy Access
In the event that service is required, easy
access to the control components is
provided with a full-length access panel
secured by quarter-turn fasteners. For
added convenience, unit wiring diagrams
are located inside the access panel for
easy reference during installation and
servicing.
Model UHEC
Horizontal Discharge
Vertical Discharge
5UH-PRC003-EN
Features and
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. All controls are built-in and
the safety temperature controls are
wired in a nonmetallic NEMA 4x control
panel with single-point power
connections.
Standard Features
Heavy-duty 304 stainless steel casing
•
NEMA 4x nonmetallic control panel
•
24-volt transformer and control circuit
•
Three-position switch (off - heat - fan)
•
Disconnect switch with enclosure
•
interlock
Capillary thermostat with stainless steel
•
sensor
Automatic reset thermal cutout
•
Totally enclosed UL listed motor
•
Pilot light (power on indicator)
•
Chrome-plated finned tubular element
•
Control panel on bottom of unit for ease
•
of installation and service
304 Stainless Steel Casing
Plated Inlet Grille
Benefits
Control Enclosure
Single-point power connection
•
Meets all UL, NEC and OSHA
•
requirements (when installed as
directed)
Model UHRA
Corrosion-resistant in high humidity and
•
water-saturated areas (for areas where
corrosion-resistance is needed in
non-hazardous areas).
Easy-mount bracket for Use with
Field- Installed Hanger or Optional
Mounting Brackets
Totally Enclosed Motor
Aluminum Fan Blade
Thermostat
Three-Position Fan Switch
Pilot Light (Heater
Energized)
Door Interlock
Disconnect Switch
(Optional)
Stainless Steel
Discharge Grille
Element
NEMA 4x Non-Metallic Enclosure
Control Components (24-Volt Standard)
UH-PRC003-EN6
Features and
Epoxy Coated 14-Gauge Cold Rolled
Steel Cabinet
Cast Aluminum Control Enclosure
with Oversized Opening
Benefits
Trane Explosion-Proof
Electric Unit Heaters
Pressure Relief Valve
Rated at 200 PSI
Model UHXA
Spiral Aluminum Finned Tubular Steel
Heat Exchanger Core Liquid Filled
Operation (see page 3)
14-Gauge Steel Adjustable
Louvers with Minimum
Position Stops
Built-In Load Carrying Contactor
Protective Heating Element Cover
Copper Sheathed Immersion Type
Heating Element
Etched Aluminum Data Plates
Riveted to Case
High Performance Aluminum Fan
Blades (not shown)
7UH-PRC003-EN
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.
Ball bearing permanently lubricated
explosion-proof motor. Chrome plated
guard meets OSHA requirements.
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.
Ethylene glycol water mixture used as
•
heat transfer fluid in the heater core,
providing -45°C, (-49°F) freeze damage
protection.
High-performance electric motor
•
driven fan blows air across finned tubes
to effect uniform heat transfer and area
heat distribution.
Automatic reset capillary type high limit
•
provides high temperature regulation
and is rated for 100,000 cycles of
service.
Stainless steel and aluminum pressure
•
relief valve handles any over-pressure.
14-gauge steel cabinet contains heater
•
core, motor and fan assembly.
Narrow gap safety fan guard shields all
•
moving parts.
Adjustable louvers allow directional
•
control of air.
Copper conductor wires enclosed in
•
rigid metal conduits carry all electrical
power.
Box lugs are furnished for field
•
connections within an approved
enclosure.
Heavy-duty control contactor with
24-volt control circuit provided on all
models.
UH-PRC003-EN8
Features and
Model UHWA
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.
Solid Construction and
Dependable Components
Sleeve
Sleeve for surface or semi-recessed
installation. 16 gauge (1.5 mm
thickness) zinc coated steel.
Element
Totally enclosed, corrosion-resistant.
Maximum finning for lower operating
temperature and longer life. Will not
become dust clogged. (No filter
required.)
Thermal Cut-Out
Exclusive “zero voltage reset” type for
high degree of effectiveness if normal
operating temperatures are exceeded.
Transformer
Optional factory assembled and wired
in 50 Series. Choice of 24 or 120 volt
secondary.
Entrance Terminals
Line side termination enclosed for safe
servicing of heaters when supplied with
circuit breakers.
Circuit Breakers
Reduces installation cost by allowing
one or more heaters to be wired from
feeder and feeder tap. Separate control
circuit switch supplied when required.
All power can be turned off before front
cover is removed.
Benefits
The high capacity and wide range of
voltage/phase and control systems
provides application versatility to meet
most installation requirements. A wide
selection of built-in factory installed and
wired, pre-engineered control systems
minimizes system design and
installation time.
Series 20 and 50
All units are equipped with zero voltage
reset thermal cut-outs for overheat
protection and a totally enclosed,
permanently lubricated motor. Optional
circuit breaker, control transformer and
a selection of integral or wall-mounted
thermostat controls are part of the unit
package.
Louvered Grille
Heavy-duty welded steel for maximum
impact resistance. Closely spaced
(pencil proof), tamperproof.
Motor Shield
Protects motor by separating return air
from heated air.
Motor
Heavy-duty unit bearing, permanently
lubricated, totally enclosed, impedance
protected.
Blade
Highly efficient, space saving bladeover-motor design, individually
balanced.
Contactor
Optional, definite purpose, heavy-duty
type with flame path separators and
dust covers. Choice of heater voltage,
120 volt or 24 volt holding coil.
Thermostat
Optional heavy-duty hydraulic snap
action type with sensing bulb in return
airstream. Disconnects all ungrounded
conductors in OFF position.
Series 50 with exposed thermostat knob
and covered circuit breaker and control
switch only
Series 20 and 50 with tamper-resistant
thermostat cover plate which is included
with each heater.
Series 50 with tamper-resistant cover
removed.
9UH-PRC003-EN
Features and
Model UHWA
Benefits
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.
Versatile application — Higher capacity
•
and wider range of voltage/phase and
control systems than any similar
heaters previously available.
Heater front withstands with less than
•
1
/16” (1.6 mm) permanent distortion,
10.8 ft lbs (324 poundals) impact and
400 lbs (181.4 kg) static force applied to
an 8 sq. in. (5160 sq. mm) area at center
grille location.
UH-PRC003-EN10
Features and
Model UHCA
Series 80
Recess mounted for 2’ (609.6 mm) x
2’ (609.6 mm) “T” bar or plaster
ceilings
Mounting Bracket — features swing up
installation on surface mounted 70
Series. Bracket center notched to
accept screws of ceiling outlet box
(installed by others). Recessed heater
80 Series has junction box attached to
heater can.
Motor — heavy-duty unit bearing,
permanently lubricated, totally
enclosed, impedance protected.
Blade — highly efficient, space-saving
blade over motor design, individually
balanced.
Thermal Cut-Out — exclusive “zero
voltage reset” type for highest degree
of effectiveness in event normal
operating temperatures are exceeded.
Heater must be manually shut off for
five minutes to reset. (See page 8.)
Element — totally enclosed and
corrosion resistant. Maximum finning
for lower operating temperatures and
long life. Will not become dust clogged.
(No filter required.)
Discharge Venturi — bull’s-eye design
permitting heated air to leave in
uniform pattern.
Plaster Trim — optional plaster trim for
recessed mounted heaters (series 80)
only. Provides finished ceiling
appearance.
Benefits
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.
Single or multiple installations at a
•
fraction of the cost of cabinet unit
heaters.
Five-year warranty.
•
2,000 to 5,000 watts.
•
208, 204 V single and three-phase.
•
277 V single-phase.
UL listed and conform to Underwriters’
•
Standard 1025.
Commercial and Institutional
Applications
Use in vestibules, entrance ways,
•
lobbies, restrooms and small office and
guard building applications.
A unique design offers surface and
•
recessed applications with higher
wattage capacity and wider range of
voltage and phase capabilities than
other heaters of this type.
Control: Line voltage and low voltage
•
control capabilities using accessory
thermostat (see page 8).
Unit mounted controls for Series 80
•
only with fan purge.
11UH-PRC003-EN
Features and
Model UHAA
Benefits
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 (1.2 mm thickness) steel painted
with a dark brown baked enamel finish.
Richly Styled Grille — Grille is
highlighted by a snap-on, 14-gauge
(1.9 mm thickness) aluminum frame,
secured to the heater with an
inconspicuous fastener.
Element — Steel sheath with plate heat
exchanger.
Fan Delay Switch — To allow the fan to
continue to run for a short period after
the thermostat is satisfied, to expel
warm air from inside the heater. Also
delays fan on start up to insure delivery
of heated air. This switch also prolongs
element life.
“Unique” Vane Axial Fan Wheel —
Draws in large volumes of air then
quietly and gently discharges 175 cfm
(82.6 l/s) of heated air downward into
the room.
UH-PRC003-EN12
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.
Group D: Atmospheres such as but not
•
limited to acetone, alcohol, gasoline,
lacquer solvent vapors, natural gas,
propane or other gases or vapors of
equivalent hazard.
Group E: Atmospheres containing
•
combustible metal dust regardless of
resistivity, or other combustible dust
of similar hazard characteristics
having resistivity of less than
5
ohm-centimeter.
10
Group F: Atmospheres containing
•
carbon black, charcoal, coal or coke
dust.
Group G: Atmospheres containing
•
combustible dust having resistivity of
5
ohm-centimeter or greater.
10
Division I: A location in which ignitable
•
concentrations of flammable material
exist under normal operating conditions.
Division II: Locations in which flammable
•
materials will normally be confined
within closed containers and escape
only in the case of accidental rupture,
breakdown or during maintenance
operations. Any equipment approved
for Division I is automatically also
approved for Division II.
Selection and application of electric unit
heaters should consider the location,
classification and properties of flammable
vapors, liquids, gases, dusts and fibers
which may be present. Each room,
section or area should be considered
individually.
For further information consult National
Electric Code and National Fire Prevention
Association (ANSI) standards. All models
conform to OSHA requirements when
mounted at any height.
Installation Conditions
1
Refer to owner’s manual.
Model UHXA
2
The Trane explosion-proof electric unit
heaters have been listed by the
Underwriters Laboratories for maximum
surface temperatures. Use only in
atmospheres having an ignition
temperature higher than 165°C (T3B) for
Class I and Class II operation.
3
Altitude restrictions — see specification
table.
4
Heater must be installed in permanently
mounted upright position and connected
to fixed power supply.
5
Do not operate in atmospheres corrosive
to steel and aluminum.
13UH-PRC003-EN
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. In warehouses and storage
areas where uniform heat distribution
and temperature control is of lesser
importance, it is desirable to use fewer
units with greater capacity.
Unit heaters mounted in the horizontal
discharge position are most effective
when heat is directed along the perimeter
of the building wall with the airflow of
each unit supporting the airflow of the
other units to create a constant flow of
warm air.
Model UHEC and Model UHRA
Unit heaters in the vertical position are
ideal for use in high ceiling areas and
areas where low mounting heights
would interfere with personnel or
equipment activity. Units mounted in the
vertical discharge position should not be
mounted higher than the unit’s published
maximum mounting height ratings.
When unit heaters are used to temper
areas such as loading dock doors, one or
more units should be arranged to
blanket the exposed opening.
UH-PRC003-EN14
Model Number
Model UHEC,
Model UHEC
Digits 1-3 — Electric Unit Heater
Digit 4 — Development Sequence
Digits 5-6 — Unit Capacity
03 — 3.3 kW
05 — 5 kW
07 — 7.5 kW
10 — 10 kW
15 — 15 kW
20 — 20 kW
25 — 25 kW
30 — 30 kW
40 — 40 kW
50 — 50 kW
Digit 7 — Element Phase
1 — Single-phase
2 Single-phase/three-phase
(field convertible)
3 — Three-phase
Digit 8 — Element and Motor Voltage
A — 208 V
B — 240/208 V
C — 277 V — Single-phase only
D — 480 V — Three-phase only
Digit 9 — 24-Volt Control Transformer
0 — None - wired for direct line voltage
A — Transformer - for 24-volt control
circuits
Digit 10 — Design Sequence
Digit 11 — Contactors
0 — None - wired for direct line voltage
A — Contactor - for 24-volt control circuits
Description
Model UHRA
Digits 1-3 — Electric Hose-Down Corrosion
Resistant Unit Heater
Digit 4 — Development Sequence
Digits 5-6 — Unit Capacity
03 — 3.3 kW
05 — 5 kW
07 — 7.5 kW
10 — 10 kW
15 — 15 kW
20 — 20 kW
25 — 25 kW
30 — 30 kW
40 — 40 kW
48 — 48 kW
Digit 7 — Element Phase
1 — Single-phase
3 — Three-phase
Digit 8 — Element Voltage
A — 208 V
G — 240 V
C — 277 V
D — 480 V
F — 600 V
Digit 9 — 24-Volt Control
Transformer/Relay
A — Transformer/Relay — Standard
Digit 10 — Design Sequence
Digit 11 —Thermostat/off/on/fan switch
— Factory installed and wired
T — Thermostat/off/on/fan switch —
Standard
UHRA, UHXA
Model UHXA
Digits 1-3 —
Electric Explosion-Proof
Unit Heater
Digit 4 — Development Sequence
Digits 5-6 — Unit Capacity
03 — 3 kW
05 — 5 kW
07 — 7.5 kW
10 — 10 kW
15 — 15 kW
20 — 20 kW
25 — 25 kW
Digit 7 — Element Phase
1 — Single Phase
3 — Three Phase
Digit 8 — Voltage
A — 208 Volts
B — 240 Volts
D — 480 Volts
F — 600 Volts
Digit 9 — Control Voltage
1 — 24 Volts (STD)
2 — 120 Volts (For 208, 240 & 480 Volts only)
3 — 208 Volts (For 208 Volts only)
4 — 240 Volts (For 240 Volts only)
Digit 10 — Design Sequence
Notes:
1. Available in 3 phase only.
2. Available in 480 volts or 600 volts,
3 phase only.
3. Available for 3 kW, 5 kW and 7.5 kW in
208 and 240 volts and 10 kW in 240 volts
only.
15UH-PRC003-EN
Loading...