Chromalox PG407-3 User Manual
DIVISION 4 SECTION
RAD
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation, Operation
and
RENEWAL PARTS IDENTIFICATION
161-048766-001
FEBRUARY, 1987
PG407-3
(Supersedes PG407-2)
Chromalox
®
© 2010 Chromalox, Inc.
Chromalox Type RAD Radiant Heaters
Converting Styles 0, 1, 3 and 3A to 3B
The current Chromalox Style 3B RAD has superseded earlier
Styles 0, 1, 3 and 3A RAD heaters. These instructions are for converting 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 nameplate.
For complete installation information for type RAD - Style
3B, request Chromalox Service Reference sheet PG404.
GENERAL
CONVERSION
Figure 1 – Style 0 and 1 Terminal Area Assembly
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)
3. NOTE: If replacing old element with a new one, omit this step.
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
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.
5. Assemble heater as shown in Figure 7.
A
B
6
7
2
CONVERSION (cont’d.)
B. CONVERTING STYLE 3 TO STYLE 3B RADIANT HEATER
1. Completely disassemble heater. Re-use the heating element O
(if desired), the extruded aluminum housing. the element support clips ••• and insulation bushing •• . Scrap all other parts.
2. Drill #24 (.152" dia.) hole in the wiring trough of the extruded
housing •• , 3" from each end.
NOTE: If replacing old element with a new one, omit steps 3 and 4.
3. Remove terminal connector from terminal pin and replace with
terminal connector 302-019961-002. The location of this connector is as shown in Figure 6.
4. Fashion wire loops from #15 gage (.072" dia.) or larger high
temperature wire (such as stainless steel or nichrome) and braze
or tack weld these loops in position 2-1/4” from each sheath end
of the element.
5. Assemble heater as shown in Figure 7 using Parts Bag 168-
016585-002.
C. CONVERTING STYLE 3A TO STYLE 3B RADIANT HEATER
1. Completely disassemble heater. Scrap the bottom terminal
blocks •••, the terminal block support brackets •••, the
Tinnerman
®
“U” speed nuts •••, the terminal block support
bracket screws ••• and the terminal block screws •••. Re-use all
the other parts, including the heating element unless a new one
is required. In this case order an element from Table A, page 3
with same voltage and wattage and for same heater housing
length as old unit.
2. Assemble heater as shown in Figure 7 using Parts Bag 168-
016585-001.
Aluminum
Housing
1
6
6
7
A
Figure 2 – Style 3 Terminal Area Assembly
Aluminum Housing
12
9
15
17
Figure 3 – Style 3A RAD Heater Terminal Area Assembly
1
7
6
A
9
17
16
15
12
RENEWAL PARTS IDENTIFICATION
13
3
11
12
4
12
9
10
5
14
Figure 4 – Parts Bag 168-016505-002 (to convert Style 0, 1 and 3B
12
11
12
9
10
Figure 5 – Parts Bag 168-016585-001
(to convert Style 3A to Style 3B)
PARTS BAG 168-016585-001 Consists of:
Terminal Block ...........303-016367-001 (2)
Speed Nuts.................272-048153·005 (4)
Terminal Block ...........303-014326-001 (2)
Screws - #8 x 1" Lg. ..248-075519-095 (6)
9
10
11
12
PARTS BAG 168-016585-001 Consists of:
Terminal Cover..............306-014405-001 (2)
Terminal Cover Clip.......056-014401-002 (4)
End Plate.......................220-017278-001 (2)
Terminal Block ..............303-016367-001 (2)
Speed Nuts....................272-048153-005 (4)
Terminal Block ..............303-014326-001 (2)
Screws - #8 x 1” ...........248-075519-095 (6)
Screws - #8 x 3/8” ........248-075519·080 (4)
Screws - #8-32 x 3/8”...248-075512-053 (4)
3
4
5
9
10
11
12
13
14
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