Chromalox Electric Heater PG421 1 User Manual

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.  
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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-  
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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  
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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  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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