DIVISION 4 SECTION
U-RAD
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation, Operation
and
RENEWAL PARTS IDENTIFICATION
161-048457-001
APRIL, 2005
PG405-5
(Supersedes PG405-4)
Chromalox
®
© 2010 Chromalox, Inc.
Model Volts kW
Overall Heated
U-RAD-2 120 or 240
800 12-3/4 8-5/16
U-RAD-2V 208 or 275
U-RAD-3 120 or 240
1100 15-7/8 11-7/16
U-RAD-3V 208 or 275
U-RAD-4V 208 or 275
1800 23-13/16 19-3/8
U-RAD-4 240 or 480
U-RAD-5V 208 or 275
2500 31-1/4 26-13/16
U-RAD-5 240 or 480
U-RAD-6V 208 or 275
3000 37-1/4 32-13/16
U-RAD-6 240 or 480
U-RAD-7V 208 or 275
3600 43-3/8 38-15/16
U-RAD-7 240 or 480
Type U-RAD Electric Radiant Heaters
The Safety Alert Symbol is used to indicate a
risk of personal injury.
Please familiarize yourself with these instructions before
attempting to install or operate this Radiant Heater.
Before Installing
1. Open carton and remove heater at the place of installation.
Mounting clamps are in parts bag in carton.
2. Check nameplate volt and watt rating against your power supply
voltage and heating requirements of your installation. This
nameplate is located on one end of the heater.
The system designer is responsible for the safety of
this equipment and should install adequate back-up
controls and safety devices with their electric heating equipment. Where the consequences of failure
could result in personal injury or property damage,
back-up controls are essential.
Specifications Table –
Single U-Shaped Element
Model Volts kW
Overall Heated
U-RAD-22 120 or 240
1600 25-1/2 16-5/8
U-RAD-22V 208 or 275
U-RAD-32 120 or 240
1900 28-5/8 19-3/4
U-RAD-32V 208 or 275
U-RAD-33 120 or 240
2200 31-3/4 22-7/8
U-RAD-33V 208 or 275
U-RAD-42V 208 or 275
2600 36-9/16 27-11/16
U-RAD-42 240
U-RAD-43V 208 or 275
2900 39-11/16 30-13/16
U-RAD-43 240
U-RAD-44V 208 or 275
3600 47-9/16 38-11/16
U-RAD-44 240
U-RAD-52V 208 or 275
3300 44 35-1/8
U-RAD-52 240
U-RAD-53V 208 or 275
3600 47-1/8 38-1/4
U-RAD-53 240
U-RAD-54V 208 or 275
4300 55-1/16 46-3/16
U-RAD-54 240 or 480
U-RAD-55V 208 or 275
5000 62-7/16 53-9/16
U-RAD-55 240 or 480
U-RAD-62V 208 or 275
3800 50 41-1/8
U-RAD-62 240
U-RAD-63V 208 or 275
4100 53-1/8 44-1/4
U-RAD-63 240
U-RAD-64V 208 or 275
4800 61-1/16 52-3/16
U-RAD-64 240 or 480
U-RAD-65V 208 or 275
5500 68-1/2 59-5/8
U-RAD-65 240 or 480
U-RAD-66V 208 or 275
6000 74-1/2 65-5/8
U-RAD-66 240 or 480
U-RAD-72V 208 or 275
4400 56-1/8 47-1/4
U-RAD-72 240
U-RAD-73V 208 or 275
4700 59-1/4 50-3/8
U-RAD-73 240
U-RAD-74V 208 or 275
5400 67-1/8 58-1/4
U-RAD-74 240 or 480
U-RAD-75V 208 or 275
6100 74-1/2 65-5/8
U-RAD-75 240 or 480
U-RAD-76V 208 or 275
6600 80-5/8 71-3/4
U-RAD-76 240 or 480
U-RAD-77V 208 or 275
7200 86-3/4 77-7/8
U-RAD-77 240 or 480
Two U-Shaped Elements
A
B
A
B
Conduit
Connector
Single-Element U-RAD
Double-Element U-RAD
Length (In.)
Length (In.)
!
INSTALLATION
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property damage. Heater must be installed or serviced by a qualified person in accordance with the National
Electrical Code, NFPA 70.
Mounting
1. These radiant heaters are designed for indoor installation only.
2. Clamps — Heaters are mounted by means of the mounting
clamp and 3/8” bolt assembly which is used as shown in Fig. 2.
Clamp assembly may be attached to heater by sliding over end
or by snapping over top of extruded frame section at any point
along its length (see Fig. 3). For proper heater support, the maximum distance between clamps must not exceed 48”. On extralong heaters, more than two clamps are furnished.
3. Mounting Holes — When heaters are mounted adjacent to
each other in the same plane, note that distance between mounting
holes on framing to support heaters will be 3-11/16”minimum.
When heaters are not in the same plane, i.e. set at an angle to one
another, distance between mounting holes in framing will be either
greater or less than 3-11/16”.
4. Framing — Where an extensive installation is being made,
the use of continuous slot metal framing manufactured by several concerns will be of assistance in saving time and money.
The frame is reusable.
5. Reflector Spacer Sheets — Where heaters are not mounted
side by side (see Fig. 4), reflector spacer sheets can be used
between heaters. These reflector spacer sheets and companion
reflectors consisting of an extruded aluminum housing with
reflector sheet and mounting clamps are available. Check with
local sales representative.
6. Insulation — Where unusually high work temperatures are
encountered, it may be desirable to insulate backs of heaters
with high-temperature fibrous insulation. A suggested method
of accomplishing this is indicated in Fig. 4.
7. Ventilation — Where solvents, water, etc. are being evaporat-
ed from work in process, it is necessary to provide substantial
quantities of ventilation air to carry away the resulting vapors.
FIRE HAZARD. Since Radiant heaters are capable
of developing high temperatures, extreme care
should be taken to:
A. Keep combustible materials at least 6” away
form sides and back of heater housing and its supporting brackets and spaced far enough in front of
heater (heating element side) so thermal radiation
from the elements will not ignite combustible
materials.
B. If combustible materials are being processed,
stoppage of process should initiate immediate
heater shutdown and interception of residual heat
from radiant heaters (use radiation baffles or move
heaters away from work).
C. In the case of solvents of an explosive nature,
ventilation air must be in sufficient volume to
dilute the solvent vapor so that explosive mixtures
cannot occur, refer to NFPA 86, Standard for Ovens
and Furnaces.
Figure 4
Insulation
Reflector
Spacer Sheet
Mounting Frame
Figure 1 — Heater Parts and Dimensions
Terminal Cover
Terminal Block
Element
Polished Aluminum Reflector
Interlocking Connector
Housing
Mounting
Clamp
Assembly
2-3/8”
3-11/16”
1/4”
1-7/8”
Figure 3
2-3/8”
2-15/16”
3-
Figure 2
WIRING
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property damage. Heater must be installed or serviced by a
qualified person in accordance with the National
Electrical Code, NFPA 70.
ELECTRIC SHOCK HAZARD. Any installation
involving electric heaters must be performed by a
qualified person and must be effectively grounded
in accordance with the National Electrical Code to
eliminate shock hazard.
1. Electrical connection to the type U-RAD Radiant Heater is
made through the 7/8” dia. opening in the end of the terminal cover of
the element assembly. A 1/2” flexible conduit connector is provided
with each element assembly for this purpose.
2. Wiring should be run in flexible or rigid metal conduit and must
be installed in accordance with the requirements of the National
Electrical Code and such other local requirements by a qualified person as defined in the NEC.
3. Access to the element terminals is obtained by removing
the mounting bolt and nut (see Figure 8, item and ) and sliding the terminal end of the element assembly out of the housing.
4. Wires supplying power to heating element terminals shall have
insulation rated for 150°C minimum.
High temperatures will oxidize copper. Use only
nickel-plated copper wire for supplying power to
heater. Do not use aluminum conductors.
5. A sufficient length of this wire (not less than 12”) should be
used to extend from each heater terminal into a connection box
location where the temperature does not exceed 300˚F.
6. Assemble terminal, screw and wire as shown in Fig. 5.
7. Hold terminal with pliers and tighten the terminal screw
securely with a screwdriver.
Note: Where circuit wiring is installed in locations of high
ambient temperature, conductors should be insulated in accordance with requirements for temperature and voltage.
8. SERIES CONNECTION of Radiant Heaters of equal volt
and watt rating is permitted in all line voltages up to 600 volts.
In making such series connections it is necessary to observe the
“right” (series-parallel) connection rather than the “wrong”
(parallel-series) connection both shown in Figure 6. If heaters
are connected according to the “wrong” illustration, failure of
any one heater will cause progressive failure of other heaters
still operating.
9. DELTA CONNECTIONS — When heaters occur in multi-
ples of three, they may be connected to, and balanced across,
three-phase lines. The most commonly used connection is the
delta connection illustrated in Figure 7.
Three phase Delta connections to minimize inductive effect in
conduits are made per this diagram. The rule: run all 3 threephase conductors in the same conduit as far as possible. For single-phase, run only two conductors and follow the same rule.
L1
L2
L1
L2
Wrong
Right
Radiant
Heaters
L1
L2
L3
Radiant
Heaters
3 Conductors
in 1 Conduit
3 Conductors
in 1 Conduit
FEDCBA
Figure 6
Figure 7
Figure 5
18
16
MAINTENANCE
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property damage. Heater must be installed or serviced by a qualified person in accordance with the National
Electrical Code, NFPA 70.
A. To Remove Heating Element —
1. Remove element assembly mounting nut and bolt and and
element support clips (see Figure 8) and slide element assembly out
of housing.
2. Disconnect heating element from electrical leads at both ends.
3. Remove screws from porcelain terminal blocks.
4. Remove element support clips and secondary insulating
bushings.
5. Lift element out of heater.
B. To Install Element —
Observe instructions for removing element and proceed in
reverse fashion. Be sure to replace secondary insulating bushings.
C. Care of Reflectors —
Reflectors should be cleaned periodically. A mild soap and
water solution or fine cleaning powder is best although more
drastic means may be required if reflectors are badly soiled by
chemical or other deposits. The reflector is aluminum. DO NOT
use alkali cleaners since alkalies will dull reflector. Mild nonalkaline cleaners, such as used for scouring kitchen sinks, may
be used. Reflectors are replaceable and may be purchased from
Chromalox.
18 16
OPERATION
FIRE/EXPOSION HAZARD. This heater is not
intended for use in hazardous atmospheres where
flammable vapors, gases, liquids or other combustible atmospheres are present as defined in the
National Electrical Code. Failure to comply can
result in personal injury or property damage.
Before energizing this heater:
1. Be sure all electrical connections are tightly made. Hold ter-
minal with pliers when tightening screw.
2. Be sure that all conductors are properly insulated.
3. Be sure that all element assemblies have been properly
replaced, and that secondary insulation bushings have not been
omitted.
A. Controlling Radiant Intensity —
Standard Radiant Heaters are built to operate at approximately
40 watts per sq. inch on the element sheath. When it is desired
to reduce radiant intensity, one or more of the following methods may be used.
1. INPUT CONTROLLERS. These motor-driven cycling
devices can be used to vary heater output capacity from 4 to
100%. They are usually connected in holding coil circuit of
magnetic contactors. See Chromalox Radiant Heater Manual
for further information regarding Input Controllers and
Contactors.
2. SOLID STATE THYRISTOR POWER CONTROLLERS.
For best non-contact control of radiant heat, a Series #6
Chromalox Thyristor Power Controller with manual potentiometer setting is recommended. Truly proportional output
of from 0-100% can be easily dialed-in to suit the particular
product or process requirements. The Series #6 panels are
pre-engineered, pre-packaged assemblies in an enclosure
with circuit disconnect provided and ready for installation.
B. Maximum Ambient Temperatures —
CHROMALOX Radiant Heaters are not recommended for
applications in ambient temperature exceeding 450˚F. Higher
ambient temperatures mean shorter heater life.
Maximum work temperature in a given time depends on several factors: Reflectivity of work, specific heat of work, mass of
work, kW input and losses from oven, and time of exposure. As
work temperature increases, the work loses heat by radiation and
by convection to the surrounding ambient. Although it is a general principle of Radiant Heater application that work temperature conventionally exceeds ambient temperature, in cases
where extremely high work temperatures are desired, it is necessary to enclose the heaters in order to increase the ambient. If
evaporation of a liquid is desired as a result of increasing work
temperature, it is necessary to provide ventilation air in order to
carry away the evaporated liquid. Under carefully engineered
circumstances, a maximum work temperature of 600˚F may be
attained.
RENEWAL PARTS IDENTIFICATION
STANDARD PARTS USED ON ALL HEATERS
Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303-014316-001
Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303-014317-001
Terminal Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .080-016868-001
Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .027-016372-001
Spacer Bushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .032-075525-012
1/2” Flexible Conduit Connector and Locknut . . . . . . . . . . . . . . . .119-075454-005
200-075482-002
Terminal Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248-046044-002
Element Support Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .059-014304-002
Insulating Bushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .032-013454-001
Bushing Retaining Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .059-017175-001
Mounting Clamp Parts Bag — For mounting heaters with overall length less than
74-1/2”, use Parts Bag 168-013071-001. For heaters with 74-1/2” or larger overall length, use Parts Bag 168-013071-002.
MISCELLANEOUS HARDWARE
#8-32 Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200-075520-064
#8-32 x 1-3/4” Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248-075512-194
#8-32 x 1” Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248-075512-185
#8 Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .328-075528-036
9
5
6
7
8
Volts kW Element Reflector
Aluminum
Model
Housing
208
UTU-4-208V 234-016383-003
UTU-3-208V 234-016383-002
U-RAD-43 240 2900
UTU-4-240V 234-016383-003
152-016376-005
UTU-3-240V 234-016383-002
275
UTU-4-275V 234-016383-003
UTU-3-275V 234-016383-002
208 UTU-4(2)-208V
U-RAD-44 240 3600 UTU-4(2)-240V 234-016383-003 (2) 152-016376-006
275 UTU-4(2)-275V
208
UTU-5-208V 234-016383-004
UTU-2-208V 234-016383-001
U-RAD-52 240 3300
UTU-5-240V 234-016383-004
152-016376-007
UTU-2-240V 234-016383-001
275
UTU-5-275V 234-016383-004
UTU-2-275V 234-016383-001
208
UTU-5-208V 234-016383-004
UTU-3-208V 234-016383-002
U-RAD-53 240 3600
UTU-5-240V 234-016383-004
152-016376-008
UTU-3-240V 234-016383-002
275
UTU-5-275V 234-016383-004
UTU-3-275V 234-016383-002
208
UTU-5-208V 234-016383-004
UTU-4-208V 234-016383-003
U-RAD-54
240
4300
UTU-5-240V 234-016383-004
UTU-4-240V 234-016383-003
152-016376-009
275
UTU-5-275V 234-016383-004
UTU-4-275V 234-016383-003
480
UTU-5-480V 234-016383-004
UTU-4-480V 234-016383-003
U-RAD-55
208
5000
UTU-5(2)-208V 234-016383-004 (2)
152-016376-010
240 UTU-5(2)-240V 234-016383-004 (2)
275 UTU-5(2)-275V 234-016383-004 (2)
480 UTU-5(2)-480V 234-016383-004 (2)
208
UTU-6-208V 234-016383-005
UTU-2-208V 234-016383-001
U-RAD-62 240 3800
UTU-6-240V 234-016383-005
152-016376-011
UTU-2-240V 234-016383-001
275
UTU-6-275V 234-016383-005
UTU-2-275V 234-016383-001
208
UTU-6-208V 234-016383-005
UTU-3-208V 234-016383-002
U-RAD-63 240 4100
UTU-6-240V 234-016383-005
152-016376-012
UTU-3-240V 234-016383-002
275
UTU-6-275V 234-016383-005
UTU-3-275V 234-016383-002
208
UTU-6-208V 234-016383-005
UTU-4-208V 234-016383-003
U-RAD-64
240
4800
UTU-6-240V 234-016383-005
UTU-4-240V 234-016383-003
152-016376-013
275
UTU-6-275V 234-016383-005
UTU-4-275V 234-016383-003
480
UTU-6-480V 234-016383-005
UTU-4-480V 234-016383-003
2 3 4
Volts kW Element Reflector
Aluminum
Model
Housing
208
UTU-6-208V 234-016383-005
UTU-5-208V 234-016383-004
U-RAD-65
240
5500
UTU-6-240V 234-016383-005
UTU-5-240V 234-016383-004
152-016376-014
275
UTU-6-275V 234-016383-005
UTU-5-275V 234-016383-004
480
UTU-6-480V 234-016383-005
UTU-5-480V 234-016383-004
U-RAD-66
208
6000
UTU-6(2)-208V 234-016383-005 (2)
152-016376-015
240 UTU-6(2)-240V 234-016383-005 (2)
275 UTU-6(2)-275V 234-016383-005 (2)
480 UTU-6(2)-480V 234-016383-005 (2)
208
UTU-7-208V 234-016383-006
UTU-2-208V 234-016383-001
U-RAD-72 240 4400
UTU-7-240V 234-016383-006
152-016376-016
UTU-2-240V 234-016383-001
275
UTU-7-275V 234-016383-006
UTU-2-275V 234-016383-001
208
UTU-7-208V 234-016383-006
UTU-3-208V 234-016383-002
U-RAD-73 240 4700
UTU-7-240V 234-016383-006
152-016376-017
UTU-3-240V 234-016383-002
275
UTU-7-275V 234-016383-006
UTU-3-275V 234-016383-002
208
UTU-7-208V 234-016383-006
UTU-4-208V 234-016383-003
U-RAD-74
240
5400
UTU-7-240V 234-016383-006
UTU-4-240V 234-016383-003
152-016376-018
275
UTU-7-275V 234-016383-006
UTU-4-275V 234-016383-003
480
UTU-7-480V 234-016383-006
UTU-4-480V 234-016383-003
208
UTU-7-208V 234-016383-006
UTU-5-208V 234-016383-004
U-RAD-75
240
6100
UTU-7-240V 234-016383-006
UTU-5-240V 234-016383-004
152-016376-015
275
UTU-7-275V 234-016383-006
UTU-5-275V 234-016383-004
480
UTU-7-480V 234-016383-006
UTU-5-480V 234-016383-004
208
UTU-7-208V 234-016383-006
UTU-6-208V 234-016383-005
U-RAD-76
240
6600
UTU-7-240V 234-016383-006
UTU-6-240V 234-016383-005
152-016376-019
275
UTU-7-275V 234-016383-006
UTU-6-275V 234-016383-005
480
UTU-7-480V 234-016383-006
UTU-6-480V 234-016383-005
U-RAD-77
208
7200
UTU-7(2)-208V 234-016383-006 (2)
152-016376-020
240 UTU-7(2)-240V 234-016383-006 (2)
275 UTU-7(2)-275V 234-016383-006 (2)
480 UTU-7(2)-480V 234-016383-006 (2)
2 3 4
10
11
12
13
14
15
16
17
18
19
Note: Part Numbers suffixed by a number in ( ) indicates the number of parts of the same part number used or supplied if more than one.
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493 www.chromalox.com
RENEWAL PARTS IDENTIFICATION
Volts kW Element Reflector
Aluminum
Model
Housing
U-RAD-3
120
1100
UTU-3-120V
234-016383-002 152-016384-002
208 UTU-3-208V
240 UTU-3-240V
275 UTU-3-275V
U-RAD-4
208
1800
UTU-4-208V
234-016383-003 152-016384-003
240 UTU-4-240V
275 UTU-4-275V
480 UTU-4-480V
U-RAD-5
208
2500
UTU-5-208V
234-016383-004 152-016384-004
240 UTU-5-240V
275 UTU-5-275V
480 UTU-5-480V
U-RAD-6
208
3000
UTU-6-208V
234-016383-005 152-016384-005
240 UTU-6-240V
275 UTU-6-275V
480 UTU-6-480V
U-RAD-7
208
3600
UTU-7-208V
234-016383-006 152-016384-006
240 UTU-7-240V
275 UTU-7-275V
480 UTU-7-480V
U-RAD-22
120
1600
UTU-2(2)-120V
234-016383-001 (2) 152-016376-001
208 UTU-2(2)-208V
240 UTU-2(2)-240V
275 UTU-2(2)-275V
120
UTU-3-120V 234-016383-002
UTU-2-120V 234-016383-001
U-RAD-32
208
1900
UTU-3-208V 234-016383-002
UTU-2-208V 234-016383-001
152-016376-002
240
UTU-3-240V 234-016383-002
UTU-2-240V 234-016383-001
275
UTU-3-275V 234-016383-002
UTU-2-275V 234-016383-001
U-RAD-33
120
2200
UTU-3(2)-120V
234-016383-002 (2) 152-016376-003
208 UTU-3(2)-208V
240 UTU-3(2)-240V
275 UTU-3(2)-275V
208
UTU-4-208V 234-016383-003
UTU-2-208V 234-016383-001
U-RAD-42 240 2600
UTU-4-240V 234-016383-003
152-016376-004
UTU-2-240V 234-016383-001
275
UTU-4-275V 234-016383-003
UTU-2-275V 234-016383-001
Element assembly includes all parts shown except items and
For element assembly part number, add prefix “R” to Element part
number Ex: R UTU-6-208V.
Volts kW Element Reflector
Aluminum
Model
Housing
U-RAD-2
120
800
UTU-2-120V
234-016383-001 152-016384-001
208 UTU-2-208V
240 UTU-2-240V
275 UTU-2-275V
2
3
4
2 3 4
1
2
4
17
10
7
19
5
6
11
8
16
2
4
3
9
16
18
14
13
12
Element
Support
Clip
Assembly
3
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
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