Chromalox RTAS, RTAS-EP Installation Instructions Manual
PJ453-7
161-562764-001
JUNE, 2004
4RT
Installation Instructions
(Supersedes PJ453-6)
NOTICE: These thermostats are designed for temperature control service only.
Because they may not fail safe, they should not be used for temperature limiting duty.
WARNING: Users should install adequate back-up controls and
safety devices with their electric heating equipment. Where the
consequences of failure may be severe, back-up controls are
essential. Although the safety of the installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations.
RTAS and RTAS-EP
Power Connection Kit With Integral Thermostat
RTAS
RTAS and RTAS-EP Kit Parts:
1 – Molded Enclosure consisting of Base – Box – Lid
1 – Three Position Terminal Block
1 – Mounting Screw for Terminal Block
1 – Uninsulated Barrel Connector (RTAS-EP Only)
1 – Cover Gasket
1 – Six Inch Length of Insulating Tubing
These kits are designed to provide temperature control as well
as termination for one run of Rapid Trace Heating Cable. Select
and purchase one grommet for terminating the cable. Please refer
to the list below to ensure you purchase the proper grommet for
the cable you are installing.
GR1 For SRL-C
GR2 For SRL-CR or SRL-CT
GR3 For CWM-C
GR4 For CWM-CT
GR5 For SRL-MC
GR6 For SRL-MCR or SRL-MCT
WARNING: Hazard of Electric Shock. Disconnect all
power before starting. All installations must be
effectively grounded in accordance with the
National Electrical Code to eliminate shock hazard.
Note: All electrical wiring, including GFCI (Ground Fault Circuit
Interrupters), must be done according to National Electrical or
local codes by a qualified person.
© 2010 Chromalox, Inc.
RTAS-EP
1 – Eight Inch Length of 14 AWG Insulated Wire
4 – Cover Screws, 5/8” Long
4 – Box Screws, 1” Long
1 – Ring Connector (RTAS Only)
1 – Thermostat
GENERAL
GR7 For SRM/E-C
GR8 For SRM-E/CT
Each kit contains enough material to connect one cable. One
additional self-regulating cable can be connected; an extra grommet is required.
Materials required for installation include: sharp utility knife,
standard electrical cutters, screwdriver and a pipe strap
(Chromalox PS or equal).
Wipe inside lip of cover with a clean cloth. Remove protective
backing from the gasket and affix it to the cover lip. Press firmly
all around for proper adhesion.
INSTALLATION
Note: These instructions are for all Self-Regulating and Constant
Wattage Heating Cables in ordinary locations. Consult factory for
installation of braided cable in hazardous locations. Not all
instructions, however, are for all cases. Each step of the instructions will have a heading in boldface stating what type of cable or
connection each instruction is intended.
INSTALLATION
1. FOR CONSTANT WATTAGE CABLES:
Cut the cable 12 inches past the last module point (indention in
cable). Note: Cutting the cable between module points creates
a non-heating cold lead. See Figure 1.
Module Point
12”
Figure 1
2. FOR CABLE WITH EXPOSED METAL BRAID (-C):
Push the braid back 12 inches on the cable. See Figure 2.
12”
Figure 2
3. FOR ALL CABLES:
Feed the ends of the cables through the appropriate holes in the
base. Allow eight inches of cable to extend above the top of the
base. Slide cable grommet over the end of the cable and insert
it into the opening in the base. See Figure 3.
4. FOR ALL CABLES:
Secure the base to the pipe by threading the appropriate sized
pipestrap through the slot in the mounting plate. Tighten the
pipestrap until the base is securely attached to the pipe. Slide
cable grommet over the end of the cable and insert it into the
opening in the base. See Figure 4.
6. FOR ALL CABLES:
Punch out the knockouts on the bottom of the box which correspond to the openings in the base through which the heating
cable passes. If you should make a mistake, blank grommets
can be ordered to re-establish the water tight seal. See Figure 6.
7. FOR ALL CABLES:
Feed the cables through the corresponding holes in the box.
Secure box to base using all four large (8-32) screws. See
Figure 7.
Figure 6 Figure 7
8. FOR OVERCOATED CABLES:
Starting from the end of the cable, unravel 1-1/2 inches of the
braid. Twist the strands together to form a pigtail. See Figure 8.
9. FOR SELF-REGULATING CABLES:
Using standard electrical cutters, cut a 3/4 inch long notch out
of the cable between the conductor wires. Bare a 3/8 inch
length of each conductor by stripping off the outside insulation
and the inner black core material. See Figure 9.
8”
Figure 3 Figure 4
5. FOR OVERCOATED CABLES (-CR or -CT):
Score the outer insulation 1-1/2 inches from the end of the cable.
Remove the jacket to expose the metal braid. See Figure 5.
WARNING: Do not damage the braid or the base cable insulation.
1-1/2”
3/4”
1-1/2”
Figure 8 Figure 9
10. FOR CONSTANT WATTAGE CABLES:
Score the outer jacket 3/4 inch from the end of the cable and
remove the jacket. Cut off the exposed nichrome wire, pushing
any remainder back under the jacket. Constant Wattage cables
have an inner layer of insulation which is also to be removed as
described above. Separate the buss wires and strip off the last
3/8 inch of insulation from both buss wires. See Figure 10.
11. FOR OVERCOATED CABLES:
Slide the insulating tube over the end of the cable. Insert the
end of the braid pigtail into the opening in the terminal block
which will be nearest the center of the box. Tighten the screw
firmly to hold the braid in place. See Figure 11.
3/8”
Figure 5
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