®
Chromalox
Installation, Operation
SERVICE REFERENCE
and
DIVISION
4
SECTION U-RAD
SALES
REFERENCE
RENEWAL PARTS IDENTIFICATION
(Supersedes PG405-4)
PG405-5
161-048457-001
DATE
APRIL, 2005
Type U-RAD Electric Radiant Heaters
Conduit
Connector
Single-Element U-RAD
B
Double-Element U-RAD
A
B
A
!
The Safety Alert Symbol
risk of personal injury.
is used to indicate a
Length (In.)
Model
Volts
kW
Overall
Heated
Please familiarize yourself with these instructions before
attempting to install or operate this Radiant Heater.
Before Installing
Two U-Shaped Elements
U-RAD-22
U-RAD-22V
U-RAD-32
U-RAD-32V
U-RAD-33
U-RAD-33V
U-RAD-42V
U-RAD-42
U-RAD-43V
U-RAD-43
U-RAD-44V
U-RAD-44
U-RAD-52V
U-RAD-52
U-RAD-53V
U-RAD-53
U-RAD-54V
U-RAD-54
U-RAD-55V
U-RAD-55
U-RAD-62V
U-RAD-62
U-RAD-63V
U-RAD-63
U-RAD-64V
U-RAD-64
U-RAD-65V
U-RAD-65
U-RAD-66V
U-RAD-66
U-RAD-72V
U-RAD-72
U-RAD-73V
U-RAD-73
U-RAD-74V
U-RAD-74
U-RAD-75V
U-RAD-75
U-RAD-76V
U-RAD-76
U-RAD-77V
U-RAD-77
120 or 240
1600
1900
2200
2600
2900
3600
3300
3600
4300
5000
3800
4100
4800
5500
6000
4400
4700
5400
6100
6600
7200
25-1/2
28-5/8
31-3/4
36-9/16
39-11/16
47-9/16
44
16-5/8
19-3/4
22-7/8
27-11/16
30-13/16
38-11/16
35-1/8
38-1/4
46-3/16
53-9/16
41-1/8
44-1/4
52-3/16
59-5/8
65-5/8
47-1/4
50-3/8
58-1/4
65-5/8
71-3/4
77-7/8
208 or 275
120 or 240
208 or 275
120 or 240
208 or 275
208 or 275
240
208 or 275
240
208 or 275
240
208 or 275
240
208 or 275
240
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240
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 heat-
ing equipment. Where the consequences of failure
could result in personal injury or property damage,
back-up controls are essential.
47-1/8
55-1/16
62-7/16
50
Specifications Table –
Length (In.)
208 or 275
240
53-1/8
61-1/16
68-1/2
74-1/2
56-1/8
59-1/4
67-1/8
74-1/2
80-5/8
86-3/4
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240
Model
Volts
kW
Overall
Heated
Single U-Shaped Element
U-RAD-2
U-RAD-2V
U-RAD-3
U-RAD-3V
U-RAD-4V
U-RAD-4
U-RAD-5V
U-RAD-5
U-RAD-6V
U-RAD-6
U-RAD-7V
U-RAD-7
120 or 240
800
12-3/4
15-7/8
23-13/16
31-1/4
37-1/4
43-3/8
8-5/16
11-7/16
19-3/8
208 or 275
120 or 240
208 or 275
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
1100
1800
2500
3000
3600
208 or 275
240
26-13/16
32-13/16
38-15/16
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
© 2010 Chromalox, Inc.
WIRING
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 accor-
dance with requirements for temperature and voltage.
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam-
age. Heater must be installed or serviced by a
qualified person in accordance with the National
Electrical Code, NFPA 70.
Wrong
Right
Radiant
Heaters
L1
L2
ELECTRIC SHOCK HAZARD.
Any installation
L1
L2
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.
Figure 6
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.
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 per-
son as defined in the NEC.
3. Access to the element terminals is obtained by removing
3 Conductors
in 1 Conduit
18
16
the mounting bolt and nut (see Figure 8, item and )and slid-
ing 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.
Radiant
Heaters
A
B
C
D
E
F
L1
L2
L3
3 Conductors
in 1 Conduit
High temperatures will oxidize copper. Use only
nickel-plated copper wire for supplying power to
heater. Do not use aluminum conductors.
Figure 7
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.
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 three-
phase conductors in the same conduit as far as possible. For sin-
gle-phase, run only two conductors and follow the same rule.
Figure 5
OPERATION
2. SOLID STATE THYRISTOR POWER CON-
TROLLERS.
For best non-contact control of radiant heat, a Series #6
Chromalox Thyristor Power Controller with manual poten-
tiometer 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 —
FIRE/EXPOSION HAZARD.
This heater is not
intended for use in hazardous atmospheres where
flammable vapors, gases, liquids or other com-
bustible 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-
CHROMALOX Radiant Heaters are not recommended for
applications in ambient temperature exceeding 450˚F. Higher
ambient temperatures mean shorter heater life.
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.
Maximum work temperature in a given time depends on sever-
al 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 gen-
eral principle of Radiant Heater application that work tempera-
ture conventionally exceeds ambient temperature, in cases
where extremely high work temperatures are desired, it is nec-
essary 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.
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 meth-
ods 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.
MAINTENANCE
B. To Install Element —
Observe instructions for removing element and proceed in
reverse fashion. Be sure to replace secondary insulating bushings.
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam-
age. Heater must be installed or serviced by a qual-
ified person in accordance with the National
Electrical Code, NFPA 70.
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 non-
alkaline cleaners, such as used for scouring kitchen sinks, may
be used. Reflectors are replaceable and may be purchased from
Chromalox.
A. To Remove Heating Element —
18
16
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.
RENEWAL PARTS IDENTIFICATION
2
3
4
2
3
4
Aluminum
Housing
Aluminum
Housing
Model
Volts
kW
Element
Reflector
Model
Volts
kW
Element
Reflector
UTU-4-208V
UTU-3-208V
UTU-4-240V
UTU-3-240V
UTU-4-275V
UTU-3-275V
UTU-4(2)-208V
UTU-4(2)-240V
UTU-4(2)-275V
UTU-5-208V
UTU-2-208V
UTU-5-240V
UTU-2-240V
UTU-5-275V
UTU-2-275V
UTU-5-208V
UTU-3-208V
UTU-5-240V
UTU-3-240V
UTU-5-275V
UTU-3-275V
UTU-5-208V
UTU-4-208V
UTU-5-240V
UTU-4-240V
UTU-5-275V
UTU-4-275V
UTU-5-480V
UTU-4-480V
UTU-5(2)-208V
UTU-5(2)-240V
UTU-5(2)-275V
UTU-5(2)-480V
UTU-6-208V
UTU-2-208V
UTU-6-240V
UTU-2-240V
UTU-6-275V
UTU-2-275V
UTU-6-208V
UTU-3-208V
UTU-6-240V
UTU-3-240V
UTU-6-275V
UTU-3-275V
UTU-6-208V
UTU-4-208V
UTU-6-240V
UTU-4-240V
UTU-6-275V
UTU-4-275V
UTU-6-480V
UTU-4-480V
234-016383-003
234-016383-002
234-016383-003
234-016383-002
234-016383-003
234-016383-002
UTU-6-208V
UTU-5-208V
UTU-6-240V
UTU-5-240V
UTU-6-275V
UTU-5-275V
UTU-6-480V
UTU-5-480V
UTU-6(2)-208V
UTU-6(2)-240V
UTU-6(2)-275V
UTU-6(2)-480V
UTU-7-208V
UTU-2-208V
UTU-7-240V
UTU-2-240V
UTU-7-275V
UTU-2-275V
UTU-7-208V
UTU-3-208V
UTU-7-240V
UTU-3-240V
UTU-7-275V
UTU-3-275V
UTU-7-208V
UTU-4-208V
UTU-7-240V
UTU-4-240V
UTU-7-275V
UTU-4-275V
UTU-7-480V
UTU-4-480V
UTU-7-208V
UTU-5-208V
UTU-7-240V
UTU-5-240V
UTU-7-275V
UTU-5-275V
UTU-7-480V
UTU-5-480V
UTU-7-208V
UTU-6-208V
UTU-7-240V
UTU-6-240V
UTU-7-275V
UTU-6-275V
UTU-7-480V
UTU-6-480V
UTU-7(2)-208V
UTU-7(2)-240V
UTU-7(2)-275V
UTU-7(2)-480V
234-016383-005
234-016383-004
234-016383-005
234-016383-004
234-016383-005
234-016383-004
234-016383-005
234-016383-004
234-016383-005 (2)
234-016383-005 (2)
234-016383-005 (2)
234-016383-005 (2)
234-016383-006
234-016383-001
234-016383-006
234-016383-001
234-016383-006
234-016383-001
234-016383-006
234-016383-002
234-016383-006
234-016383-002
234-016383-006
234-016383-002
234-016383-006
234-016383-003
234-016383-006
234-016383-003
234-016383-006
234-016383-003
234-016383-006
234-016383-003
234-016383-006
234-016383-004
234-016383-006
234-016383-004
234-016383-006
234-016383-004
234-016383-006
234-016383-004
234-016383-006
234-016383-005
234-016383-006
234-016383-005
234-016383-006
234-016383-005
234-016383-006
234-016383-005
234-016383-006 (2)
234-016383-006 (2)
234-016383-006 (2)
234-016383-006 (2)
208
240
275
208
240
275
480
U-RAD-43
2900
152-016376-005
U-RAD-65
5500
152-016376-014
208
240
275
U-RAD-44
U-RAD-52
3600
3300
234-016383-003 (2) 152-016376-006
208
240
275
480
234-016383-004
234-016383-001
234-016383-004
152-016376-007
234-016383-001
234-016383-004
234-016383-001
234-016383-004
234-016383-002
234-016383-004
152-016376-008
234-016383-002
234-016383-004
234-016383-002
234-016383-004
234-016383-003
234-016383-004
234-016383-003
152-016376-009
234-016383-004
234-016383-003
234-016383-004
234-016383-003
234-016383-004 (2)
234-016383-004 (2)
234-016383-004 (2)
234-016383-004 (2)
234-016383-005
234-016383-001
234-016383-005
152-016376-011
234-016383-001
234-016383-005
234-016383-001
234-016383-005
234-016383-002
234-016383-005
152-016376-012
234-016383-002
234-016383-005
234-016383-002
234-016383-005
234-016383-003
234-016383-005
234-016383-003
152-016376-013
234-016383-005
U-RAD-66
U-RAD-72
6000
4400
152-016376-015
152-016376-016
208
240
275
208
240
275
208
240
275
480
208
240
275
208
240
275
208
240
275
480
208
240
275
480
208
240
275
480
U-RAD-53
U-RAD-54
3600
4300
U-RAD-73
U-RAD-74
4700
5400
152-016376-017
152-016376-018
208
240
275
480
U-RAD-55
U-RAD-62
5000
3800
152-016376-010
208
240
275
208
240
275
208
240
275
480
U-RAD-75
6100
152-016376-015
U-RAD-63
U-RAD-64
5
4100
4800
U-RAD-76
U-RAD-77
6600
7200
152-016376-019
152-016376-020
208
240
275
480
234-016383-003
234-016383-005
234-016383-003
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
13 Insulating Bushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .032-013454-001
14
6
7
Bushing Retaining Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .059-017175-001
15 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 over-
all length, use Parts Bag 168-013071-002.
8
9
MISCELLANEOUS HARDWARE
10
16
17
18
19
#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
11
12
Terminal Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248-046044-002
Element Support Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .059-014304-002
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.
RENEWAL PARTS IDENTIFICATION
2
3
4
17
Aluminum
Housing
Model
Volts
kW
Element
Reflector
120
208
240
275
208
240
275
480
208
240
275
480
208
240
275
480
208
240
275
480
120
208
240
275
UTU-3-120V
UTU-3-208V
UTU-3-240V
UTU-3-275V
UTU-4-208V
UTU-4-240V
UTU-4-275V
UTU-4-480V
UTU-5-208V
UTU-5-240V
UTU-5-275V
UTU-5-480V
UTU-6-208V
UTU-6-240V
UTU-6-275V
UTU-6-480V
UTU-7-208V
UTU-7-240V
UTU-7-275V
UTU-7-480V
UTU-2(2)-120V
UTU-2(2)-208V
UTU-2(2)-240V
UTU-2(2)-275V
UTU-3-120V
UTU-2-120V
UTU-3-208V
UTU-2-208V
UTU-3-240V
UTU-2-240V
UTU-3-275V
UTU-2-275V
UTU-3(2)-120V
UTU-3(2)-208V
UTU-3(2)-240V
UTU-3(2)-275V
UTU-4-208V
UTU-2-208V
UTU-4-240V
UTU-2-240V
UTU-4-275V
UTU-2-275V
7
U-RAD-3
1100
234-016383-002
234-016383-003
234-016383-004
234-016383-005
234-016383-006
152-016384-002
152-016384-003
152-016384-004
152-016384-005
152-016384-006
19
Element
Support
Clip
U-RAD-4
U-RAD-5
U-RAD-6
U-RAD-7
U-RAD-22
1800
2500
3000
3600
1600
5
10
Assembly
6
12
2
13
11
8
16
3
14
4
234-016383-001 (2) 152-016376-001
234-016383-002
234-016383-001
234-016383-002
234-016383-001
152-016376-002
234-016383-002
234-016383-001
234-016383-002
234-016383-001
18
120
208
240
275
9
16
U-RAD-32
1900
Element assembly includes all parts shown except items3
and4
1
For element assembly part number, add prefix “R” to Element part
120
208
240
275
number
Ex: R UTU-6-208V.
2
U-RAD-33
U-RAD-42
2200
2600
234-016383-002 (2) 152-016376-003
4
3
2
Aluminum
Housing
Model
Volts
kW
Element
Reflector
234-016383-003
234-016383-001
234-016383-003
152-016376-004
234-016383-001
234-016383-003
234-016383-001
208
240
275
120
208
240
275
UTU-2-120V
UTU-2-208V
UTU-2-240V
UTU-2-275V
U-RAD-2
800
234-016383-001
152-016384-001
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493
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