Installation, Operation
and
4
U-RAD
(Supersedes PG421)
PG421-1
RENEWALPARTSIDENTIFICATION
161-058006-001
APRIL, 2005
Type U-RAD-LT Electric Radiant Heaters
Specifications Table —
!
The Safety Alert Symbol
sonal injury.
is used to indicate a risk of per-
A
B
Overall
Heated
Please familiarize yourself with these instructions before
attempting to install or operate this Radiant Heater.
Model
Volts
Watts
Length (In.) Length (In.)
Single U-Shaped Element
U-RAD-2LT
120 or 240
0800
1100
1800
2500
3000
3600
135/
16
87/
16
U-RAD-2VLT
208 or 275
41/4” Dia.
(Typ.)
U-RAD-3LT
U-RAD-3VLT
U-RAD-4VLT
U-RAD-4LT
U-RAD-5VLT
U-RAD-5LT
U-RAD-6VLT
U-RAD-6LT
U-RAD-7VLT
U-RAD-7LT
120 or 240
208 or 275
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
167/
16
115/
16
311/16”
3
/
4” Pipe Tap on
243/
3113/
3713/
4315/
8
193/
2613/
3213/
3815/
8
B
Back Side of
Heater (Typ.)
A
Single Element U-RAD-LT
16
16
16
16
208 or 275
240 or 480
16
16
B
A
Two U-Shaped Elements
U-RAD-22LT
120 or 240
Double Element U-RAD-LT
1600
1900
2200
2600
2900
3600
3300
3600
261/
8
165/
8
U-RAD-22VLT
208 or 275
U-RAD-32LT
U-RAD-32VLT
U-RAD-33LT
U-RAD-33VLT
U-RAD-42VLT
U-RAD-42LT
U-RAD-43VLT
U-RAD-43LT
U-RAD-44VLT
U-RAD-44LT
U-RAD-52VLT
U-RAD-52LT
U-RAD-53VLT
U-RAD-53LT
U-RAD-54VLT
U-RAD-54LT
U-RAD-55VLT
U-RAD-55LT
U-RAD-62VLT
U-RAD-62LT
U-RAD-63VLT
U-RAD-63LT
U-RAD-64VLT
U-RAD-64LT
U-RAD-65VLT
U-RAD-65LT
U-RAD-66VLT
U-RAD-66LT
U-RAD-72VLT
U-RAD-72LT
U-RAD-73VLT
U-RAD-73LT
U-RAD-74VLT
U-RAD-74LT
U-RAD-75VLT
U-RAD-75LT
U-RAD-76VLT
U-RAD-76LT
U-RAD-77VLT
U-RAD-77LT
120 or 240
208 or 275
120 or 240
208 or 275
208 or 275
240
208 or 275
480
208 or 275
240 or 480
208 or 275
240
208 or 275
240
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240
208 or 275
240
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240
208 or 275
240
291/
4
193/
4
323/
371/
401/
481/
445/
473/
555/
631/
509/
5311/
619/
691/
75
5611/
5913/
6711/
753/
817/
871/
8
227/
2711/
3013/
383/
351/
381/
463/
535/
411/
441/
523/
595/
655/
471/
503/
585/
6511/
721/
777/
8
Housing
8
16
4
16
Mounting
Clamp
Assembly
8
4
Terminal Box
Cover
8
8
Element
Terminal Box
4
4
8
16
4300
5000
3800
4100
4800
5500
6000
4400
4700
5400
6100
6600
7200
Polished Aluminum Reflector
8
8
Figure 1 — Heater Parts and Dimensions
16
8
Before Installing
16
4
1. Open carton and remove heater at the place of installation.
Mounting clamps are in parts bag in carton.
16
16
2. Check nameplate volt and watt rating against your power sup-
ply voltage and heating requirements of your installation. This
nameplate is located on one end of the heater.
16
8
8
16
4
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 conse-
quences of failure could result in personal injury or
property damage, back-up controls are essential.
16
8
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
208 or 275
240 or 480
16
16
16
16
16
16
4
8
© 2010 Chromalox, Inc.
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 heater will cause progressive failure of other heaters still
operating.
9. DELTA CONNECTIONS — When heaters occur in multiples
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 single-phase,
run only two conductors and follow the same rule.
3 Conductors
in 1 Conduit
Wrong
Right
Radiant
Heaters
A
B
C
D
E
F
Radiant
Heaters
L1
L2
L3
L1
L2
L1
L2
3 Conductors
in 1 Conduit
Figure 7
Figure 6
OPERATION
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 cir-
cuit disconnect provided and ready for installation.
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:
Maximum Ambient Temperatures —
Chromalox Radiant Heaters are not recommended for applica-
tions in ambient temperatures exceeding 450°F. Higher ambient
temperatures mean shorter heater life.
1. Be sure all electrical connections are tightly made. Hold ter-
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 gener-
al 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.
minal with pliers when tightening screw.
2. Be sure that all conductors are properly insulated.
3. Be sure that terminal box cover has been properly replaced,
and that secondary insulation bushings have not been omitted.
Standard Radiant Heaters are built to operate at 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 poten-
MAINTENANCE
To Install Element —
Observe instructions for removing element and proceed in
reverse order. Be sure to replace secondary insulating bushings.
Care of Reflectors —
Reflectors should be cleaned periodically. A mild soap and
water solution or fine cleaning powder is best although more dras-
tic means may be required if reflectors are badly soiled by chemi-
cal 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.
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.
To Remove Heating Element —
1. Remove terminal box cover 6 .
2. Disconnect heating element from electrical leads.
3. Remove threaded fitting nuts 9 and washers 8 .
4. Remove element support clips and secondary insulating bushings.
5. Lift out element.
RENEWAL PARTS IDENTIFICATION
4
2
3
Aluminum
Housing
Model
Volts Watts
Element*
Reflector
6
U-RAD-2LT
U-RAD-2VLT
U-RAD-2LT
U-RAD-2VLT
U-RAD-3LT
U-RAD-3VLT
U-RAD-3LT
U-RAD-3VLT
U-RAD-4VLT
U-RAD-4LT
U-RAD-4VLT
U-RAD-4LT
U-RAD-5VLT
U-RAD-5LT
U-RAD-5VLT
U-RAD-5LT
U-RAD-6VLT
U-RAD-6LT
U-RAD-6VLT
U-RAD-6LT
U-RAD-7VLT
U-RAD-7LT
U-RAD-7VLT
U-RAD-7LT
U-RAD-22LT
U-RAD-22VLT
U-RAD-22LT
U-RAD-22VLT
120
208
800
240
275
120
UTU-2LT
UTU-2VLT
UTU-2LT
UTU-2VLT
UTU-3LT
UTU-3VLT
UTU-3LT
UTU-3VLT
UTU-4VLT
UTU-4LT
UTU-4VLT
UTU-4LT
UTU-5VLT
UTU-5LT
UTU-5VLT
UTU-5LT
UTU-6VLT
UTU-6LT
UTU-6VLT
UTU-6LT
UTU-7VLT
UTU-7LT
UTU-7VLT
UTU-7LT
UTU-2LT (2)
UTU-2VLT (2)
UTU-2LT (2)
UTU-2VLT (2)
UTU-3LT
234-013411-032
234-013411-033
234-013411-034
234-013411-035
234-013411-036
234-013411-037
234-013411-032 (2)
152-016961-001
152-016961-002
152-016961-003
152-016961-004
152-016961-005
152-016961-006
152-016963-001
5
10
208
1100
240
275
208
8
240
1800
275
11
480
208
2
13
9
240
2500
275
14
7
480
208
3
240
3000
275
480
208
240
15
3600
275
480
120
4
208
1600
240
275
234-013411-033
234-013411-032
234-013411-033
234-013411-032
234-013411-033
234-013411-032
234-013411-033
234-013411-032
U-RAD-32LT
U-RAD-32VLT
U-RAD-32LT
U-RAD-32VLT
120
UTU-2LT
Figure 8
UTU-3VLT
UTU-2VLT
UTU-3LT
UTU-2LT
UTU-3VLT
UTU-2VLT
208
1900
240
152-016963-002
1 Element assembly includes all parts shown except items 3 and
For element assembly part number, and prefix “R” to Element part
number 2 Ex: R UTU-6VLT, 208V, 3000W
4
275
RENEWAL PARTS IDENTIFICATION
4
4
2
3
Aluminum
Housing
2
3
Aluminum
Housing
Model
Volts Watts
Element*
Reflector
Model
Volts Watts
Element*
Reflector
U-RAD-33LT
U-RAD-33VLT
U-RAD-33LT
U-RAD-33VLT
120
208
240
275
208
UTU-3LT (2)
UTU-3VLT (2)
UTU-3LT (2)
UTU-3VLT (2)
UTU-4VLT
UTU-2VLT
UTU-4LT
U-RAD-66VLT
U-RAD-66LT
U-RAD-66VLT
U-RAD-66LT
208
240
275
480
208
UTU-6VLT (2)
UTU-6LT (2)
UTU-6VLT (2)
UTU-6LT (2)
UTU-7VLT
UTU-2VLT
UTU-7LT
2200
234-013411-033 (2)
152-016963-003
152-016963-004
6000
234-013411-036 (2)
152-016963-015
152-016963-016
234-013411-034
234-013411-032
234-013411-034
234-013411-032
234-013411-034
234-013411-032
234-013411-034
234-013411-033
234-013411-034
234-013411-033
234-013411-034
234-013411-033
234-013411-037
234-013411-032
234-013411-037
234-013411-032
234-013411-037
234-013411-032
234-013411-037
234-013411-033
234-013411-037
234-013411-033
234-013411-037
234-013411-033
234-013411-037
234-013411-034
234-013411-037
234-013411-034
234-013411-037
234-013411-034
234-013411-037
234-013411-034
234-013411-037
234-013411-035
234-013411-037
234-013411-035
234-013411-037
234-013411-035
234-013411-037
234-013411-035
234-013411-037
234-013411-036
234-013411-037
234-013411-036
234-013411-037
234-013411-036
234-013411-037
234-013411-036
U-RAD-42VLT
U-RAD-42LT
U-RAD-42VLT
U-RAD-43VLT
U-RAD-43LT
U-RAD-43VLT
U-RAD-72VLT
U-RAD-72LT
U-RAD-72VLT
U-RAD-73VLT
U-RAD-73LT
U-RAD-73VLT
U-RAD-74VLT
U-RAD-74LT
U-RAD-74VLT
U-RAD-74LT
U-RAD-75VLT
U-RAD-75LT
U-RAD-75VLT
U-RAD-75LT
U-RAD-76VLT
U-RAD-76LT
U-RAD-76VLT
U-RAD-76LT
240
275
208
240
275
2600
4400
4700
240
275
208
240
275
208
240
275
480
208
240
275
480
208
240
275
480
UTU-2LT
UTU-2LT
UTU-4VLT
UTU-2VLT
UTU-4VLT
UTU-3VLT
UTU-4LT
UTU-7VLT
UTU-2VLT
UTU-7VLT
UTU-3VLT
UTU-7LT
2900
3600
3300
152-016963-005
152-016963-006
152-016963-007
152-016963-017
152-016963-018
UTU-3LT
UTU-3LT
UTU-4VLT
UTU-3VLT
UTU-4VLT (2)
UTU-4LT (2)
UTU-4VLT (2)
UTU-4LT (2)
UTU-5VLT
UTU-2VLT
UTU-5LT
UTU-7VLT
UTU-3VLT
UTU-7VLT
UTU-4VLT
UTU-7LT
U-RAD-44VLT
U-RAD-44LT
U-RAD-44VLT
U-RAD-44LT
208
240
275
480
234-013411-034 (2)
UTU-4LT
5400
6100
UTU-7VLT
UTU-4VLT
UTU-7LT
234-013411-035
234-013411-032
234-013411-035
234-013411-032
234-013411-035
234-013411-032
234-013411-035
234-013411-033
234-013411-035
234-013411-033
234-013411-035
234-013411-033
234-013411-035
234-013411-034
234-013411-035
234-013411-034
234-013411-035
234-013411-034
234-013411-035
234-013411-034
U-RAD-52VLT
U-RAD-52LT
U-RAD-52VLT
U-RAD-53VLT
U-RAD-53LT
U-RAD-53VLT
U-RAD-54VLT
U-RAD-54LT
U-RAD-54VLT
U-RAD-54LT
208
240
275
208
240
275
208
240
275
480
UTU-4LT
UTU-2LT
UTU-7VLT
UTU-5VLT
UTU-7LT
UTU-5VLT
UTU-2VLT
UTU-5VLT
UTU-3LT
UTU-5VLT
UTU-3LT
UTU-5VLT
UTU-3LT
UTU-5VLT
UTU-4VLT
UTU-5LT
UTU-5LT
152-016963-021
UTU-7VLT
UTU-5VLT
UTU-7LT
3600
4300
152-016963-008
152-016963-009
UTU-5LT
UTU-7VLT
UTU-6VLT
UTU-7LT
UTU-6LT
6600
7200
152-016963-019
152-016963-020
UTU-4LT
UTU-7VLT
UTU-6VLT
UTU-7LT
UTU-5VLT
UTU-4VLT
UTU-5LT
UTU-6LT
UTU-4LT
U-RAD-77VLT
U-RAD-77LT
U-RAD-77VLT
U-RAD-77LT
208
240
275
480
UTU-7VLT (2)
UTU-7LT (2)
UTU-7VLT (2)
UTU-7LT (2)
U-RAD-55VLT
U-RAD-55LT
U-RAD-55VLT
U-RAD-55LT
208
240
275
480
UTU-5VLT (2)
UTU-5LT (2)
UTU-5VLT (2)
UTU-5LT (2)
UTU-6VLT
UTU-2VLT
UTU-6LT
234-013411-037 (2)
Ex: UTU-3VLT 275V
5000
3800
234-013411-035 (2)
152-016963-010
152-016963-011
*When ordering, specify Model Number and Volts.
234-013411-036
234-013411-032
234-013411-036
234-013411-032
234-013411-036
234-013411-032
234-013411-036
234-013411-033
234-013411-036
234-013411-033
234-013411-036
234-013411-033
234-013411-036
234-013411-034
234-013411-036
234-013411-034
234-013411-036
234-013411-034
234-013411-036
234-013411-034
234-013411-036
234-013411-035
234-013411-036
234-013411-035
234-013411-036
234-013411-035
234-013411-036
234-013411-035
U-RAD-62VLT
U-RAD-62LT
U-RAD-62VLT
U-RAD-63VLT
U-RAD-63LT
U-RAD-63VLT
U-RAD-64VLT
U-RAD-64LT
U-RAD-64VLT
U-RAD-64LT
U-RAD-65VLT
U-RAD-65LT
U-RAD-65VLT
U-RAD-65LT
208
240
275
208
240
275
208
240
275
480
208
240
275
480
UTU-2LT
PARTS COMMON TO ALL HEATERS (PER ELEMENT)
UTU-6VLT
UTU-2VLT
UTU-6VLT
UTU-3VLT
UTU-6LT
5
6
Terminal Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .304-037344-001
Terminal Box Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .080-048621-001
Threaded Fitting Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132-010712-007 (2)
Threaded Fitting Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .328-046907-003 (2)
Threaded Fitting Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200-046906-003 (2)
Saddle Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .238-026539-001 (2)
Terminal Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248-046044-002 (2)
Element Support Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .059-014304-002
Insulating Bushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .032-013454-001
Bushing Retaining Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .059-017175-001
7
8
4100
4800
152-016963-012
152-016963-013
UTU-3LT
9
UTU-6VLT
UTU-3VLT
UTU-6VLT
UTU-4VLT
UTU-6LT
10
11
13
14
15
UTU-4LT
UTU-6VLT
UTU-4VLT
UTU-6LT
UTU-4LT
HEATER MOUNTING CLAMP ASSEMBLY
UTU-6VLT
UTU-5VLT
UTU-6LT
For heaters less than 741/2” overall length
(Includes two complete assemblies) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168-013071-001
For heaters 741/2” and greater overall length
UTU-5LT
5500
152-016963-014
(Includes three complete assemblies) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168-013071-002
UTU-6VLT
UTU-5VLT
UTU-6LT
UTU-5LT
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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