Installation and Maintenance Manual: 272137-B, TF4X40 Heat Tracing Temerature Switch for Ordinary Locations
Nelson Installation and Maintenance Manual: 272137-B, TF4X40 Heat Tracing Temerature Switch for Ordinary Locations Manuals & Guides
Installation And Maintenance Instructions
HEAT TRACING TEMPERATURE SWITCH
FOR ORDINARY AREAS
Model TF4X40
Remote sensing bulb and capillary type
Description
The remote bulb and capillary type are used to
sense the fluid media temperature.
The local mount types are used to sense ambient
temperatures for freeze protection applications.
Caution: Do not use this switch for hazardous
environments. Sensing bulb and probe
must not exceed specified proof
temperatures.
Installation
Caution: This switch should be installed by a
trained service person.
Switch
Mounting: Switch may be mounted in any position.
Sensors: For heat tracing, install bulb toward the
bottom of pipe or vessel, away from heat
sinks and approximately 90° from the
heat tracing cable. Always secure both
bulb and capillary and wrap with proper
insulating tape.
For ambient sensing, orient the probe for
optimal ambient temperature sensing,
away from heat sources or heat sinks.
Enclosure: Type NEMA 4X .
Enclosure temperature limits:
-30 °F to 140 °F (-34 °C to 60 °C).
Wiring
All electrical wiring must comply with local and
national electrical codes.
Caution: Electrical rating must be within range
stated on switch nameplate. Failure to
stay within rating may result in damage
to, or failure of electrical contacts.
Electrical
Rating: 22A at 125, 250, 480 VAC.
Electrical
Connection: Two #14 AWG wires 12 inches long.
Switch is wired normally open.
Testing of the Switch
Testing of the swi tch may be done before or after
final installation. If bench tested, the swi tch should
be re-tested when installed in the final application.
Be sure switch can be tested without affecting other
equipment. Check nameplates for elec trical rating
and circui try (normally closed or normally open) of
switch. Cycle switch a few times to check operation.
Set-Point Adjustment
Switch is factory set. Set-point is not user-adjustable.
Switch contacts close at 40° ±4°F on decreasing
temperature set-point.
Agency Approvals
Underwriters Laboratories, Inc.
Temperature Indicating and Regulating
Equipment File No. E56247, Guide No. XAPX.
Canadian Standards Association listed for
Temperature Indicating and Regulating
Equipment File No. LR34555,
Guide No. 400-E-O, Class 4813.
Troubleshooting
Warning: Disconnect electrical power supply to
swi tch before removal or inspection.
Failure to observe this warning could
result in serious injury or switch damage.
Important: The swi tch is
case of damage, replace entire swi tch.
Causes of improper operation:
1. Incorrect electrical connection: check leads to
switch. Be sure they are properly connected.
See “Wiring” section for circuitry color code.
2. Faulty control circuit: check electrical power
supply to swi tch. Check for loose or blown fuses,
open circuited or grounded wires, loose
connections at the switch
3. Incorrect temperature: check temperature in
system. Temperature must be within range
specified on nameplate.
4. Excessive vibration: check for temperature
fluctuations in system. Check swi tch mounting
and be sure there is no excessive vibration.
If the operation of the swi tch cannot be corrected by
the above means, consult factory or authorized
factory representative.
not field-repairable. In
NELSON HEAT TRACING SYSTEMS, Tulsa, OK 74146 Bulletin No. 272137-B 01-26-07 1 of 3
For service or ordering information
Consult factory or authorized factory representative.
Specify full catalog number (with any optional modifications or factory set-point) as shown on part
number code.
Warranty
All products of the company are sold and all services
are offered subject to the company's standard
conditions of sale.
TEMPERATURE RANGE
SWITCH
NUMBER
TF4X40
FIXED SET POINT
40 °F (4.4 °F) DECREASING
BULB SENSOR EXPOSURE
LIMITS (PROOF)
-40 TO 160 °F (-40 TO 71 °C)
WIRE CODE
Purple = Common
Blue = Normally Open
4
101.6
3/8 DIA.
9.5
1/16
DIA.
1.6
1/4 DIA.
MOUNTING HOLE
2 PLACES
6.0
2.50
63.5
3/8
10
4 1/2
114
3/8
9.5
1 1/8 DIA. HOLE
FOR 3/4 NPT
CONDUIT HUB
5 1/4
133
28.6
1/5 2 PL
5.1
2 1/2
63.5
3 1/4
82.5
DIMENSIONS IN BOXES
ARE IN MILLIMETERS
NELSON HEAT TRACING SYSTEMS, Tulsa, OK 74146 Bulletin No. 272137-B 01-26-07 2 of 3
Installation Instructions
A
Installing the Thermostat
1. Verify that the thermostat is suitable for the area where it is to be
installed.
2. Check the line voltage and the heat-tracing load to ensure that the
thermostat ratings are not exceeded.
Conduit
drain
3. Mount the unit in a position that prevents condensation from draining
into the enclosure from the connecting conduit, (see diagram at left).
Positioning (Ambient)
4. Mount ambient-sensing units in the area exposed to the coldest
temperature and most wind. Do not mount on the side of a warm
building on in a location that is exposed to warm air currents or direct
sunlight.
Positioning the Sensor Bulb (Line Sensing)
90°
Single traced
Heating cable
Control thermostat bulb
Tap e
5. Position the bulb in the lower quadrant of the pipe as shown in the
diagrams to the left. Place the bulb at least three feet from pipe
supports, valves, or other heat sinks; protect the capillary from kinks
or bends less than 1/2 inch in radius.
Double traced
Heating cable
Control thermostat bulb
Tap e
6. Tape the bulb firmly to the pipe with aluminum tape, making sure
there is no air space between the bulb and pipe. Do not overlap the
bulb and heating cable with the same piece of tape.
Wiring
Pow er Su pp ly
GFEPD
G
G
Ø
N
120-V supply
Power
connection
Purple
wire
Blue
wire
208-V or 240-V supply
Ø
Ø
or
Braid
Heating
Cable
Figure 1. Heat-tracing control
C
Control
thermostat
NC
Thermostat bulb
(see "Positioning"
instructions above
mounting details)
Power Supply
GCNANBN
C
GFEPD
Ø
Ø
B
120-V supply – 120-V heating cable or
Ø
C
208-V supply – 240-V heating cable
Pur ple
wir e
Blue
wir e
120-V or
240-V
coil
Braid
Heating
Cable A
Heating
Cable
B
Heating
Cable C
Figure 2. Contactor control
For switching heat-tracing loads greater than 22 A
or switching multiple heat-tracing circuits.
C
Control
thermostat
NC
Thermostat bulb
(see "Positioning"
instructions above
mounting det ails)
Important: All information, including illustrations, is believed to be reliable. Users, however, should independently evaluate the suitability of each
product for their particular application.
NELSON HEAT TRACING SYSTEMS, Tulsa, OK 74146 Bulletin No. 272137-B 01-26-07 3 of 3
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