Chromalox SLL, HSRL, SRF, CPR, DL, SRCCH, RTES, Thermwire Installation guide

Chromalox SLL, HSRL, SRF, CPR, DL, SRCCH, RTES, Thermwire Installation guide
Installation Instructions
Industrial Heating Cable
Products
PJ438a-24
161-057884-001
November, 2016
Important General Instructions
These instructions are to be followed when installing Chromalox
Heating cables on pipes in ordinary locations. Consult factory for
installation of braided cable in hazardous locations. Chromalox
has four basic types of heating cables: Self-Regulating, Constant
Wattage, Mineral Insulated and Series Long Line Cable. Although
they are all resistance type cables, they each have different operating characteristics. These characteristics may make one type of
cable more suitable for a particular application than another. This
manual, however, is not intended as a product selection manual.
Refer to Chromalox Design Guide for Heat Tracing Products” for
product selection guidelines. Below is a chart highlighting certain
characteristics for Chromalox heating cables.
ELECTRIC SHOCK HAZARD. Any cable with an insulation resistance reading less than 10 megohms before
installation should not be installed. Contact your local
Chromalox representative.
4. The heating cables should be stored in their shipping cartons
or on reels in a dry atmosphere until they are ready to be installed.
5. Handle coils and reels utilizing equipment designed for that
purpose.
6. Do not drop coils or reels, especially from transporting equipment.
7. Lift or handle reels so that the lifting/handling device does
not come in contact with the cable or it’s protective covering.
Coils should be placed on a skid.
8. Handle reels so that the deterioration or physical damage of
cable is prevented.
1. Open package and visually check for breaks or nicks in the
cable jacket. File claim with carrier if any damage is found.
2. Never energize the cable when it’s coiled or on a reel. Test only
when it is laid out straight.
3. After removing the cable from the carton or wrapping, check
the resistance of the unit from buss wires to braid or metal
sheath with a 500 VDC (1,000 VDC recommended) megger
to assure the cables have not been damaged during shipping
and handling. If the cable has no braid or metal sheath, uncoil
the cable onto a metal surface and check resistance between
the buss wires and the metal surface. See table on page 9 for
acceptable minimum insulation resistance readings.
NOTICE
STORE IN DRY AREA
These products may be become damaged by moisture. Damage to electrical components,
electrical properties, corrosion or other damage may occur if equipment is not stored
in a dry location. Visual inspection and electrical checks must be performed prior to
installation to ensure safety and proper operation. See equipment installation manual
or contact the factory for more information. 800-443-2640 or www.chromalox.com.
2
Chromalox Cable Types
Self-Regulating
Constant
Wattage
Mineral
Insulated
Series
Long Line
Hazardous ratings available
Yes
Yes
Yes
Yes
Usable on plastic pipe
Yes*
No
No
No
Can be cut to length in field
Yes
Yes
No
Yes
Can be single overlapped
Yes
No
No
No
* SRL only on plastic pipe.
Resistance Wire
Overcoat Over
Braid (Optional)
Binder
Buss Wires
Buss Wires
Tinned Copper
Braid (Optional)
Jacket
Module Point
Primary Insulation
Conductive Matrix
Tinned Copper Braid (Optional)
Overcoat Over Braid (Optional)
Self-Regulating
Constant Wattage
High Temperature
Fluoropolymer
Overjacket
Alloy 825 Sheath
Densely
Compacted
Mineral Insulation
16, 14, 12,10 AWG
Copper Buss Wires
Metallic Braid
High Temperature
Fluoropolymer Jacket
High Temperature
Fluoropolymer Core Matrix
Twin (Shown) or Single
Resistance Wires
SLL Long Line
Mineral Insulated
Installation
A. IMPORTANT — GENERAL NOTES REGARDING
INSTALLATION OF HEAT TRACING SYSTEMS.
FIRE HAZARD. Failure to follow these guidelines could
result in property damage or personal injury.
1. Read this instruction sheet and those enclosed with the accessories to familiarize yourself with the products.
2. Selection of heating cable type and rating should be in accordance with the procedures located in the “Chromalox Design
Guide for Heat Tracing Products”.
3. Ensure all pipes, tanks etc. have been hydrostatically tested
prior to the installation of the heating cable.
4. Always install tracing at the 5 or 7 o’clock position on a pipe.
5. Installation Guidelines for fire protection systems:
a. For use on insulated UL listed steel schedules 5, 10, 20
and 40 standpipe and sprinkler system pipe up to and in-
3
cluding 6 in. size. Includes use on elbows, tees, flanges,
hangers and valves as shown. (show figures of heating
cable installed to various equipment as mentioned above).
UL listed fiberglass insulation with a minimum k-factor of
0.25 BTU/hr -˚F/ft2 -in with weatherproof cladding must be
used.
b. For systems having piping which connects between buildings in unheated areas, coolers and freezers.
c. For systems having sprinkler piping that is installed in coolers or freezers where the temperature is -40˚F or greater.
Not intended to be used as the means to prevent freezing of
sprinkler branch lines including all accessories for these lines
and automatic (deluge, preaction, dry pipe, alarm, etc.) valves
as referenced in NFPA 13.
For use in Ordinary Hazard Occupancies only as specified in
NFPA 13 the standard for the installation of sprinkler systems.
Fire suppression system heater circuits must be connected
to monitoring equipment. A listed power supply relay with the
— Allowing the cable to be walked on or subjec ed to other abuse which could cause mechan
ical damage.
appropriate voltage coil shall be connected in parallel prior
to the heat tracing (should show figure with typical installation). The output contacts of the listed power supervisory relay
should be connected to a listed fire control panel which has
provisions for supervisory circuits.
6. Do not attempt to heat trace any piece of equipment
which will not be insulated.
7. Do not install heating cable on equipment which
could become hotter than the heating cable’s maximum exposure temperature.
8. Do not install heating cable in an area or on equipment which contains potentially corrosive materials
without having a suitable protective jacket on the
cable.
9. The minimum bending radius for all Chromalox
heating cables is six times the minor diameter.
10. Allow a minimum of 2” between cable runs.
11.Always install heat tracing on the outside radius of
elbows.
12.Never install heat tracing over expansion joints
without leaving slack in the cable.
13.Never use tie-wire or pipe straps to secure SelfRegulating Maximum Circuit length or Constant
Wattage heating cables.
14. Observe all published specifications. Do not expose
cables to temperatures above their specified maximums. Do not run cables longer than specified maximum circuit lengths. See table 3 for details.
15. Pumps and small vessels should be heat traced and controlled with the piping on the inflow end. The cable on the
pump or vessel should be physically separate to permit disconnection during maintenance or removal.
16.Use aluminum foil tape to cover the heating cable whenever
the cable is not in good contact with the pipe (i.e. at supports,
valves, pumps, etc.) or whenever its use is specified by the
“Chromalox Design Guide for Heat Tracing Products”.
17.Separately controlled circuits should be provided on dead end
legs and closed bypasses.
18.No heat tracing circuit should extend more than two feet beyond a point where two or more pipes join when such junctions permit optional flow paths. In such cases, separately
controlled traces should be used.
19.The minimum installation temperature for all Chromalox heating cables is -76˚F (-60˚C).
20.Chromalox Type SRL heating cables are well suited for heat
tracing plastic pipes. Consult “Chromalox Design Guide for
Heat Tracing Products” for design recommendations. Installation details AD1 through AD17 apply for plastic pipe only when
Type SRL heating cable is used. Consult factory for applications involving other products.
3. When you reach the end of the circuit, secure the heater cable
to the pipe using glass tape or plastic cable tie with a temperature rating compatible with the heater cable.
If this end is to have an end seal installed, remember to leave
about a foot of extra cable. If it is a power connection, leave
about two feet of extra heater cable.
4. (If the heater cable is to be spiralled, go to step 4A.)
Begin attaching the cable to the pipe about every foot (.3 meters).
Place the cable on the bottom half of the pipe at the 5 or 7
o’clock position. Refer to installation detail AD1. Go to step 5.
a. Note the path of the heater cable and the spiral factor of
the design. A simple way to think about spiral factor is:
A1.1 spiral factor means install 11 feet of heating cable on
every 10 feet of pipe, etc. At about every 10 feet of pipe,
pull the required amount of cable and let hang in a loop,
and attach the cable to the pipe.
b. Rotate the loops around the pipe until all the slack has
been taken up. Even out the spirals of the heater cable and
secure to the pipe as necessary to obtain good contact.
The entire circuit can be installed with hanging loops with
the spiralling on the pipe being done when you trace the
heat sinks. Refer to installation detail AD3.
5. At a heat sink (pipe supports, valves, pumps, reducers, gauges, bucket strainers, etc.), attach the heater cable to the pipe
just before the heat sink. Refer to the design specs to determine the amount of heater cable you need to install on the
heat sink. Pull this amount of cable into a loop, attach the
heater cable on the other side of the heat sink and continue
attaching the cable down the pipe as before.
6. When you reach the heater cable reel, you should have the
heater cable attached all along the pipe, with the correct
amount of heater cable pulled in loops at all heat sinks. Attach
the cable to the pipe, (leave an extra foot if at an end seal, two
feet if at a power connection) and cut the heater cable from
the reel.
7. Install the heater cable loops on the heat sinks. Refer to the
proper installation detail (AD5-AD12) for a general idea of how
to install the cable, but remember:
• It is important to get the proper amount of heater cable on
the heat sink, rather than exactly as the detail shows. The
detail is just a guide.
• Self-Regulating heater cables are very flexible and can be
single overlapped for installation ease. Feel free to use this
feature when you can.
FIRE HAZARD. Do not overlap constant wattage or mineral insulated heating cables.
B. INSTALLING A SINGLE RUN OF CABLE ON A PIPE.
1. Mount the reel of cable on a holder and place near one end of
the pipe run to be traced. Choose the end from which it will be
the easiest to pay out the cable.
2. Pay out the cable from the reel and loosely string along the
piping, making sure the cable is always next to the pipe when
crossing obstacles. For example, if the heater is on the wrong
side of a crossing pipe, you will have to restring the cable or
cut and splice it.
• By having the cable installed this way, it can be removed
easily from the heat sink without cutting if access to, or
removal of the heat sink is required.
Note: If a tee is designed into the system, or if you are using two
or more short cable lengths to complete a circuit, allow two or
three feet of each cable to overlap. This will allow flexibility in assembling the connection kit and locating it on the pipe.
C. INSTALLING MORE THAN ONE HEATING CABLE ON A
PIPE.
There are two cases where you will need to install more than one
heater cable on a pipe:
• When the design calls for more than one cable.
•
When the lines being heat traced are considered important
enough to install a backup (redundant) heat tracing system.
To prevent damage to cable, avoid such things as:
— Pulling the cable over sharp edges.
— Forcibly pulling the cable free if it snags while
being paid out.
4
The installation requirements are different for these cases.
1. Installing multiple heater cables for design requirements.
The most common multiple cable requirement is two cables
on a pipe. Below are the recommended techniques for the two
cable systems. They also apply to installations where three or
more cables are to be installed on a pipe.
There are two ways of paying out two heater cables along a
pipe. The first is to locate two reels of heater cable and supply
one cable from each. This method works for all types of piping
runs.
However, it may increase material waste by leaving unusable
lengths from two reels. The second way is to supply both cables from one reel. This method is generally the easiest for
relatively straight, simple piping runs. For each circuit, decide
which method to use and then go to the appropriate part below.
a. Supplying cable from two reels.
The general procedure here is the same as given earlier,
but there are a few things to do to make sure the system is
correctly done.
i. At each heat sink, the easiest thing to do is supply the
extra heater called for by the design drawing from only
one heater cable. This avoids having to measure out half
of the requirement from each cable.
ii. When doing the previous step, leave a small loop other cable at equipment which may be serviced, such as
pumps, valves, instruments, etc. This is so both heater
cables may be removed enough for future access.
b. Supply heater cables from one reel.
The general procedure is the same as given earlier, but
there are a few things to do to make sure the system is
correctly done.
i. With this method, a loop is pulled for the entire circuit.
To do this, attach the end of the heater cable to the pipe
near the heater cable reel. Remember to leave enough
extra cable for the type of connection to be installed.
ii. Begin pulling the cable off the reel in a large loop down
the piping run. Be sure to keep the cable next to the
pipe. Moving down the run, continue attaching the cable to the pipe, leaving the side of the loop going back
to the reel unattached.
iii.You will want both sides of the loop to be about the
same length to avoid future problems. Also, it is easier
to install the extra cable required at each heat sink from
only one cable. Therefore, pull the right amount of extra
heater cable needed at every second heat sink from the
side of the loop you are attaching to the pipe. At the
remaining serviceable heat sinks (pumps, valves, instruments, etc.) don’t forget to leave a short loop of cable
for slack when access to the equipment is needed.
iv.When the end of the piping run is reached, pull the
proper amount of extra cable for the connection to be
installed.
v. Now, begin working the remaining side of the loop back
toward the reel, installing it on the pipe and heat sinks
as required.
2. Installation for Backup (Redundant) Systems.
The purpose of a backup system is to provide the proper
amount of heat from the second heater cable if there are problems with the first. Therefore, each cable must be installed so
it can do the job alone. The simplest way to do this is to install
the first heater cable as given in Section B. Then, go back and
install the backup heater cable the same way.
There are several things to keep in mind:
• The power connections and end seals for the two cables
are often designed to be at opposite ends of the run in a
redundant system. Remember to leave the proper amount
of extra cable for the connection to be installed on each
cable at that end.
• On piping one inch IPS or smaller, it can be difficult to apply both heater cables with good contact at all places. The
main thing is to get the correct amount of cable installed.
However, try to get as much contact with the piping and
heat sinks from both cables as possible.
Supplementary Instructions for ATEX and IECEx Applications
SRL and SRM/E Self-Regulating Heating Cables, U Series
Connection Accessories Type UPC, UMC, UES and RTES
1. Do not bend the cable for a length of 300mm from the cable
gland inlet.
2. Connection and termination of Chromalolx ATEX and IECEx
certified cable must be carried out by using the U Series of
certified cable connection kits as supplied by Chromalox, Inc.
These are only to be used for the operations for which they
were designed.
3. The supply circuit to the heating cables must be protected by
a safety differential device or equivalent ground fault protection.
4. The earthing braid of the heat trace cable must be bonded to
a suitable earth terminal.
5. The minimum cable installation temperature for SRL and
SRM/E cable is -40˚C (-40˚F).
6. The certified minimum cable exposure temperature for SRL
and SRM/E cable is -60˚C (-76˚F).
ELECTRIC SHOCK HAZARD. Disconnect all power before installing or servicing heating cable. Failure to do
so could result in personal injury or property damage.
Heaters must be installed by a qualified person in accordance with IEC 62086-2 2001.
Any installation involving electric heating cables must
be performed by a qualified person and must be effectively grounded in accordance with IEC 62086-2:2001
to eliminate shock hazard.
5
Typical Installation Detail
AD1 - One Run of Cable
AD1 - Two Runs of Cable
AD3 - One Cable-Spiralling Method
AD4 - One Run of Cable at Pipe Elbow
AD5 - Orifice Flange
AD6 - Expansion Joint
6
AD7 - Welded Support
AD8 - Shoe Support
AD9 - Valve
AD10 - Pressure Gauge
AD11 - Diaphragm Pressure Gauge
AD12 - Level Gauge
7
AD13 - U Series Power Connection
AD14 - U Series Splice & Tee Connection
AD14 - EL Series Splice and Tee Kit
AD15 - End Seal
AD15-2
AD16 - DL Series Power Connection
8
AD17 - DL Series Splice & Tee Connection
AD18 - Sensor Placement
Wiring
7. All equipment must be properly grounded.
8. Install installation accessories according to the instructions
included in the kits and per installation details AD13 through
AD17.
ELECTRIC SHOCK HAZARD. Disconnect all power before installing or servicing heating cable. Failure to do
so could result in personal injury or property damage.
Heater must be installed by a qualified person in accordance with the National Electrical Code, NFPA 70.
To prevent equipment damage, Circuits fed from overhead lines should be protected by secondary lighting arrestors.
ELECTRIC SHOCK HAZARD. Any installation involving
electric heating cables must be performed by a qualified
person and must be effectively grounded in accordance
with the National Electrical Code to eliminate shock
hazard.
CONTROLS:
1. All heating circuits should have temperature controls. Temperature control of the pipeline can be obtained through various
Chromalox temperature controls.
2. Contactors must be used when load currents exceed the rating of the thermostat contacts. Equipment protection ground
fault (30 mA EPD) thermal breakers are recommended with
type SRL, SRM/E, SRP & SLL.
3. The temperature control should be mounted in a location
where it will not be subjected to excessive shock or vibration.
4. Line sensing temperature sensors should be mounted in accordance with Installation Detail AD18 (see Detail above).
5. Ambient sensing temperature sensors should be located at a
point where the lowest ambient temperature is expected.
ACCESSORIES:
1. Selection of installation accessories should be in accordance
with ChromaTrace 3.0 design software program. Ensure accessories are rated for the area where they are located. If
Chromalox accessories are not used with cable, all third party
approvals are voided.
2. Only use Chromalox installation kits and use them only for the
operations for which they are designed.
3. The instructions included in the Chromalox installation accessories must be followed in order for the third party approvals
(UL, FM, CSA, ATEX, IECEx, etc.) to apply.
4. Junction boxes must be in accordance with the requirements
of the area classification.
5. All outdoor junction boxes must be located above grade level.
Covers should be kept on the boxes at all time when not being
worked in.
6. All terminations must be protected from the weather and from
physical damage by locating them either under the weatherproof insulation or inside an appropriate junction box.
To prevent equipment damage, handle and secure temperature sensors, especially thermostat bulbs and capillaries with care to avoid distortion or crimping which
might impair control accuracy.
6. Exposed thermostat capillaries should have mechanical protection.
9
End Cap
End Cap
Heat Generating Matrix
Buss Wire
Heat Resistance Wire
L2
Power Supply
L1
L2
Power Supply
Buss Wire
L1
Thermostat
Thermostat
Contactor
Contactor
Heat Resistance Wire
Heat Generating Matrix
L2 Power
L1 Supply
L2 Power
L1 Supply
End Cap
Buss Wire
End Cap
Buss Wire
Control
Circuit
Control
Circuit
Thermostat
Thermostat
II. Constant Wattage
I. Self-Regulating
Contactor
End Cap
Heat Resistance Wire
Cold Lead
Heat Resistance Wire
L2
Power Supply
L1
L2 Power
L1 Supply
End Cap
Thermostat
Control
Circuit
OR
L1
L2
Thermostat
Thermostat
III. Mineral Insulated
Installation Testing
When the heater cable and connections for a circuit have been
completed, immediately perform the following checks.
1. Visually inspect the heater cable and temperature controls for
signs of mechanical damage. If damage is seen, either replace
the complete heater cable, or cut out the damaged section
and replace using the proper splice connection for the area
and cable you are using.
2. Inspect all connections to be sure they are correctly assembled. Be sure each heater cable entry to a connection has a
grommet and the compression plates and caps are properly
tightened.
3. Inspect the insulation resistance of the circuit using a 500 VDC
(1,000 VDC recommended) megger. Always perform this test
at the power connection. See the following table for minimum
insulation resistance readings. Any cable with an insulation resistance below the recommended value should be removed
and factory should be contacted.
Chromalox SR
Delivery
20 MΩ
Installed Maintenance
5 MΩ
5 MΩ
Chromalox MI
20 MΩ
5 MΩ
5 MΩ
Chromalox Snow Melt
20 MΩ
5 MΩ
5 MΩ
4. Check voltage at end of circuit and record in log.
(See page 14).
10
Thermal Installation
An installed heating circuit should be thermally insulated immediately to provide protection from damage from ongoing
work. Things to remember about insulating:
1. Insulate the equipment being heat traced as soon as possible
after the heating cable is installed. This will protect the cable
from possible physical damage.
2. The type and thickness of thermal insulation specified on the
design drawing must be used. If you use another type or thickness, the heater cable type or amount may have to be changed.
3. Never install wet insulation. Both the piping and the insulation
must be dry when thermally insulating a circuit. Wet insulation
may cause start-up or operational problems.
4. Properly weatherproof the thermal insulation. All places where
valve stems, conduits, pipe supports, connection housing, thermal capillary tubes, etc. extend outside the insulation jacketing
must be sealed with a suitable compound to keep water out.
5. Insulate valves fully up to, and including, the packing gland.
6. Heat trace and fully insulate the face of all non-diaphragm pressure instruments.
7. Insulation must be covered by a weatherproof barrier, such as
an aluminum jacket.
8. If you are using metal jacketing and sheet metal screws, be sure
the screws are not long enough to penetrate the thermal insulation and damage the heater cable.
9. Again, perform the megger test on the circuit immediately after
the thermal insulation is installed to detect if any mechanical
damage may have occurred.
10.When the insulation and the weatherproofing is complete, attach “Electric Traced” labels on the outside of the insulation.
These should be installed where they are visible from normal
operations, usually on alternating sides about every 10 feet. It is
also useful to mark the location of any connections buried under
the insulation.
Additional requirements for rigid thermal insulations:
1. In the standard single heater cable installation, rigid insulations
do not need to be oversized. However, they should be carved so
there is no gap in the insulation.
2. In case of redundant or multiple heater cables, rigid insulations
which are .500 inches oversized should be used.
Commission Testing
For systems controlled by line-sensing thermostats:
1. Set the thermostat to the desired control temperature.
2. Turn the main circuit breaker ON.
3. Turn ON the branch circuit breakers controlled by the thermostat.
4. Allow the pipe temperatures to be raised to the control point.
This may take up to four hours for most circuits (large full
pipes may take longer).
5. Measure the amperage draw, ambient temperature, and pipe
temperature for each circuit and record in the installation log.
This information may be needed for future maintenance and
troubleshooting.
1. Again, visually inspect the piping, insulation and connections for
the heater cable to make sure no physical damage has occurred if
some time period has elapsed since the installation and start-up.
2. Megger the system again to determine if damage not readily
visible has occurred.
3. Turn all branch circuit breakers to the OFF position.
For systems controlled by ambient-sensing thermostats:
1. If the actual ambient temperature is higher than the desired
thermostat setting, turn the thermostat setting up high enough
to turn the system ON or (some models) turn the selector
switch to the ON position.
2. Turn the main circuit breaker ON.
3. Turn the branch breakers ON one-by-one until all are on.
4. Allow system to run at least four hours in order to let all pipes
reach steady-state.
5. Measure the amperage draw, ambient temperature and pipe
temperature for each circuit and record in the installation log.
This information may be needed for future maintenance and
troubleshooting.
6. When the system is completely checked out, reset the thermostat to the proper temperature.
For redundant systems:
Follow the procedure above for the type of control system you
have, but commission the systems one at a time. Start up the primary system, qualify it and shut it down. Then start up the backup
system, qualify it and shut it down.
Specifications
Table 1 – Maximum Temperatures
Max. Maintain
(Power On)
Max. Exposure
(Power Off)
SRL / HSRL
150˚F
185˚F
SRM/E / HSRM
302˚F
420˚F
Cable Type
CWM
See table below
See table below
SRF
150˚F
185˚F
SLL
302˚F
450˚F
SRP
230˚F
275˚F
11
Table 2 – CWM Cable Maximum Maintenance Temperatures
Temperatures (˚F)
Output (W/Ft.)
3
w/o AT-1 Tape
4
340
w AT-1 Tape
6
325
350
6.7
293
344
8
282
332
9
262
328
10.1
246
320
10.6
229
314
12
222
307
200
304
296
Table 3 – Maximum
SRL / HSRL Circuit Breaker Selection (Max. Circuit Lengths in Ft.)
SRL
SRL
SRL
SRL
SRL
SRL
SRL
SRL
50°F Start-Up (Ft.)
Cable
Rating
/ HSRL3-1C
/ HSRL3-2C
/ HSRL5-1C
/ HSRL5-2C
/ HSRL8-1C
/ HSRL8-2C
/ HSRL10-1C
/ HSRL10-2C
10A
205
400
125
250
100
185
60
100
15A
305
600
185
375
150
285
95
160
20A
360
660
250
505
200
375
130
210
25A
NR
NR
270
540
215
420
160
260
0°F Start-Up (Ft.)
30A
NR
NR
NR
NR
NR
NR
180
315
40A
NR
NR
NR
NR
NR
NR
NR
360
10A
135
275
90
180
70
135
50
80
15A
200
415
135
270
110
200
80
125
20A
270
555
180
360
145
265
105
170
-20°F Start-Up (Ft.)
25A 30A 40A
330 360 NR
660 NR NR
225 270 NR
450 540 NR
180 215 NR
335 395 420
130 155 180
210 255 340
10A
120
245
80
160
65
120
45
75
15A
185
370
120
245
100
175
70
120
20A
245
495
160
325
130
235
95
160
25A 30A 40A
300 360 NR
600 660 NR
205 245 270
405 490 540
165 200 210
300 350 420
120 140 180
195 240 320
SRP Circuit Breaker Selection (Max. Circuit Lengths in Ft.)
Cable
Rating
SRP 5/1
SRP 10/1
SRP 15/1
SRP 5/2
SRP 10/2
SRP 15/2
15A
145
100
75
295
200
150
50°F Start-Up (Ft.)
20A
30A
40A
195
295
390
135
200
270
100
150
200
385
580
750
270
400
530
195
295
390
50A
490
330
250
750
665
500
0°F Start-Up (Ft.)
20A
30A 40A
145
215
295
95
145
190
80
120
160
290
430
580
190
290
380
160
235
320
15A
110
70
60
220
145
120
50A
360
240
200
720
480
400
15A
70
65
55
135
130
110
-20°F Start-Up (Ft.)
20A
30A 40A
90
135
180
85
130
175
70
110
145
180
270
360
175
260
350
145
220
290
50A
225
215
180
450
440
360
SRM/E / HSRM Circuit Breaker Selection (Max. Circuit Lengths in Ft.)
SRM/E
SRM/E
SRM/E
SRM/E
SRM/E
SRM/E
SRM/E
SRM/E
SRM/E
SRM/E
SRM/E
SRM/E
Cable
Rating
/ HSRM 3-1
/ HSRM 3-2
/ HSRM 5-1
/ HSRM 5-2
/ HSRM 8-1
/ HSRM 8-2
/ HSRM 10-1
/ HSRM 10-2
/ HSRM 15-1
/ HSRM 15-2
/ HSRM 20-1
/ HSRM 20-2
50°F Start-Up (Ft.)
15A
285
575
180
360
145
285
95
190
70
145
60
115
20A
385
770
240
480
190
380
125
255
95
190
75
155
30A
NR
780
360
720
285
575
190
385
145
290
115
230
40A
NR
NR
375
750
325
650
250
490
190
385
155
305
0°F Start-Up (Ft.)
50A
NR
NR
NR
NR
NR
NR
NR
NR
210
420
160
350
15A
275
540
165
325
135
255
90
165
65
120
50
100
12
20A
375
750
220
430
175
345
110
225
85
175
65
135
30A
385
780
330
645
265
520
175
345
125
270
105
200
40A
NR
NR
375
750
325
650
250
490
165
360
140
270
-20°F Start-Up (Ft.)
50A
NR
NR
NR
NR
NR
NR
NR
NR
210
420
160
350
15A
265
525
155
310
130
245
85
155
60
115
45
90
20A
365
740
210
415
165
335
100
215
80
165
65
130
30A
385
780
310
620
250
490
170
330
120
260
100
195
40A
NR
NR
375
750
325
650
245
470
150
340
135
255
50A
NR
NR
NR
NR
NR
NR
250
490
210
420
160
335
CWM Specifications
SRF Circuit Breaker Selection (Max. Circuit Lengths in Ft.)
Circuit Load
(Amps / Ft.)
0.033
Max Circuit
Length (Ft.)
350
CWM 8-1CT
0.067
CWM 12-1CT
40°F Start-Up (Ft.)
0°F Start-Up (Ft.)
240
Cable
Rating
SRF 3-1C
20A
350
30A
360
40A
NR
20A
270
30A
360
40A
NR
0.100
200
SRF 3-2C
660
NR
NR
555
660
NR
CWM 4-2CT
CWM 8-2CT
0.017
0.033
700
480
SRF 5-1C
230
270
NR
180
270
NR
CWM 12-2CT
0.050
400
SRF 5-2C
SRF 8-1C
450
180
540
215
NR
NR
360
145
540
215
NR
NR
CWM 12-4CT
0.025
780
SRF 8-2C
330
420
420
265
395
420
Model
CWM 4-1CT
SLL Specifications
16.00
Nominal Output Ratings on Metal Pipe - 120 VAC
Nominal Output Ratings on Metal Pipe - 240 VAC
14.00
W/Ft.
12.00
W/Ft.
12.00
10.00
10.00
SLL45
SLL28
8.00
8.00
SLL18
SLL10
6.00
4.00
2.00
2.00
0.00
200
400
600
800
1000
SLL28
SLL18
6.00
4.00
0
SLL45
1200
1400
1600
0.00
0
500
1000
1500
Cable Length (ft.)
16.00
14.00
14.00
W/Ft.
12.00
W/Ft.
12.00
Nominal Output Ratings on Metal Pipe - 480 VAC
10.00
SLL28
3000
3500
SLL45
SLL28
8.00
SLL18
SLL18
SLL10
6.00
SLL10
6.00
2500
Nominal Output Ratings on Metal Pipe - 600 VAC
SLL45
8.00
2000
Cable Length (ft.)
16.00
10.00
SLL10
4.00
4.00
2.00
2.00
0.00
0
0.00
0
1000
2000
3000
4000
5000
6000
7000
1000
2000
3000
4000
5000
6000
7000
8000
Cable Length (ft.)
Cable Length (ft.)
NR = Not Required. Maximum circuit length has been reached in a smaller breaker size.
Note — Thermal magnetic circuit breakers are recommended since magnetic circuit breakers could “nuisance trip” at low temperature.
Maintenance
Repair or replace all damaged heater cable, connections, thermal
insulation and weatherproofing using only Chromalox connections and methods before testing the system.
Record all repairs made and measurements taken in the installation and maintenance log.
Recommended maintenance for Chromalox heat tracing systems
consists of performing the steps involved in the commission testing on a regular basis. For those systems controlled by line sensing thermostats, Chromalox recommends checking the system at
least twice per year. Systems controlled by an ambient-sensing
thermostat should be checked when the season requiring their
use is approaching.
13
4000
Installation and Maintenance Log
Reference Information
Circuit Number
Circuit Breaker Number
Drawing Number
Circuit Length
Heat Tracing Visual Checks
No Signs of Moisture, Corrosion
or Damage
Proper Electrical Connection
Proper Grounding of the Braid
Initial
Date
Initial
Date
Initial
Date
Heat Tracing Electrical Checks
Megger Test (500 VDC)
(Bypass Controls)
Amperage Draw Test
Compare to design Amperage Draw
Voltage at end of Circuit*
Meg Ohms
Date
Amperage
Amp. Temp
Date
Voltage
Date
Accessories/Control Checks
Temperature Control Properly Set
Sensors Protected and Undamaged
All Enclosures and Kits Closed and
Sealed
Setpoint
Date
Initial
Date
Initial
Date
Thermal Insulation Checks
Location of Kits Visible on Outside of
Insulation
Initial
Insulation is Complete, Dry and
Weatherproof
Initial
Date
Date
* This test must be performed at installation or at any time the cable is cut or damaged in any way.
14
Division 1 / Zone 1 – Checklist Example
Location:
System / Project Number
Circuit ID #
Test Value / Remarks
Reference Drawing(s)
Date
Initials
Area:
Ignition Temperature
Group Classification
Trace Heater Circuit:
Trace Heater type
Supply Voltage
Circuit Length
Design Maximum Pipe Temperature
Trace Heater Device Temp Identification Number (T-rating)
Components:
Power Connection
End Seal
Tee Connection
Splice
Ground-Fault Protection
Make & Model
Ground Leakage
Trip Level (mA)
Installation Instructions:
Correct Components Per Manufacturers Specification
Seal Fittings (when used) Opened and Inspected (properly
poured)
Ground-Leakage Device Tested
Insulation Resistance Testing:
Instrument Used
Calibration Date
Megohmmeter Test Voltage (minimum 500 VDC,
recommended 1000 VDC for MI, 2500 VDC for polymeric)
Electrical Jacket Before Thermal Insulation Installed
(minimum value shall be 20 megohms)
Overjacket Before Thermal Insulation Installed (minimum
value shall be 20 megohms- Div. 1 only)
Overjacket After Thermal Insulation Installed (minimum insulation resistance value shall be 20 megohms- Div. 1 only
Circuit Ready to Commission
Name (Print): _______________________________________________ Signed: _____________________________________
Company: __________________________________________________ Date: _______________________________________
15
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
Chromalox, Inc.
1347 Heil Quaker Boulevard
Lavergne, TN 37086
(615) 793-3900
www.chromalox.com
© 2016 Chromalox, Inc.
16
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