®
Chromalox
SERVICE REFERENCE
Installation, Operation
and
DIVISION
SALES
4
SECTION RAD
(Supersedes PG407-2)
PG407-3
161-048766-001
REFERENCE
RENEWAL PARTS IDENTIFICATION
DATE
FEBRUARY, 1987
Chromalox Type RAD Radiant Heaters
Converting Styles 0, 1, 3 and 3A to 3B
GENERAL
The current Chromalox Style 3B RAD has superseded earlier
Styles 0, 1, 3 and 3A RAD heaters. These instructions are for con-
verting these earlier models to the current Style 3B. This conversion
is necessary because replacement parts for the old models are no
longer available.
The changes involved are primarily in the terminal area as
shown in Figures I, 2 and 3. Match-up one of the Figures with your
heater's terminal arrangement and order the corresponding parts bag
(Figures 4 and 5). If an element or other part listed in Table A (page
3) is necessary, order according to heater housing length and the
voltage and wattage stamped on the element and the heater name-
plate.
For complete installation information for type RAD - Style
3B, request Chromalox Service Reference sheet PG404.
CONVERSION
CAUTION: Hazard of electric shock. Disconnect
power before servicing heater.
A. CONVERTING STYLES 0 AND 1 TO
STYLE 3B RADIANT HEATER
1. Completely disassemble heater. Re-use the heating element (if
desired) and the extruded aluminum housing (Fig. 7). Scrap all
the other parts.
2. Drill #24 (.152" dia.) hole in the back of the extruded housing
, 3" from each end. (See Fig. 7)
A
3. NOTE: If replacing old element with a new one, omit this step.
B
Remove wire retaining loops (Fig. 6) from the elements and
replace with wire loops fashioned from #15 gage (.072" dia.) or
larger stainless steel wire located 2-1/4” from each end of the
sheath. Other high temperature materials such as nichrome may
be substituted. Braze or tack weld the loops in position.
4. Besides the Parts Bag 168-016585-002 (Fig. 4), you will need
6
7
2
insulation bushings , element support clips
, reflector
and element (if required) as listed in Table A, page 2.
NOTE: Quantities of these parts, as well as size of element and
reflector will be determined by the heater housing length of the old
unit.
Figure 1 – Style 0 and 1 Terminal Area Assembly
5. Assemble heater as shown in Figure 7.
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RENEWAL PARTS IDENTIFICATION
MISCELLANEOUS HARDWARE
13
Screws
8
Terminal Screw .....................................................................248-046044-002(2)
#8 x 1” Lg..............................................................................248-075519-095(6)
#8 x 3/8” Lg...........................................................................248-075519-080(4)
#8-32 x 3/8” Lg.....................................................................248-075512-053(4)
12
12
13
14
11
4
3
MISCELLANEOUS HARDWARE
8
8
Terminal Screw .....................................................................303-016367-001(2)
Speed Nuts ............................................................................272-048153·005(4)
Terminal Block.......................................................................303-014326-001(2)
Saddle Clamp ........................................................................238-026539-001(2)
15
10
11
15
1
12
9
HEATER MOUNTING CLAMP ASSEMBLY
14
For mounting heater with catalog numbers up to Cat. No. RAD 7000
use mounting clamp assembly part no. 168-013071-001. For mount-
ing heaters above Cat. No. RAD 7000 use mounting clamp assem-
bly part no. 168-013071-002.
10
5
Aluminum
Housing
A
7
6
Figure 7 – Style 3B RAD Heater Terminal Area Assembly
6
1
2
7
Heater
Housing Length
Element
Catalog Number
Reflector
Sheet
Insulation
Bushing
Element
Support Clip
Volts
Watts
120
208
240
275
RTU-2083A-120V
RTU-2083AV
24-3/8”
30-5/8”
800
234-013411-001
234-013411-012
________
________
________
________
RTU-2083A-240V
RTU-2083AV-275V
120
208
240
275
RTU-3113A-120V
RTU-3113AV
RTU-3113A-240V
RTU-3113AV
1100
1800
2500
208
240
275
480
RTU-4183AV
RTU-4183A-240V
RTU-4183AV
46-5/8”
61-3/8”
234-013411-014
234-013411-016
032-013454-001 (2)
032-013454-001 (6)
059-013424-001
RTU-4183A-480
208
240
275
480
RTU-5253AV
RTU-5253A-240V
RTU-5253AV
059-013424-001 (3)
RTU-5253A-480V
208
240
275
480
RTU-6303AV
RTU-6303A-240V
RTU-6303AV
73-3/4”
85-3/4”
3000
3600
234-013411-018
032-013454-001 (8)
059-013424-001 (4)
RTU-6303A-480V
208
240
275
480
RTU-7363AV
234-013411-004*
and
234-013411-012*
RTU-7363A-240
RTU-7363AV
032-013454-001 (10) 059-013424-001 (5)
RTU-7363A-480V
*For ease of installation. these reflectors shipped in two pieces (one each of part numbers listed).
NOTE: Part numbers suffixed by a number in ( ) Indicates the quantity of the same part number used.
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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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