nvent EC-TS Installation Instructions Manual

WARNING:

EC-TS

Ambient, Pipe or Slab Sensing Electronic Thermostat With
25 Foot Temperature Sensing Lead Installation Instructions

DESCRIPTION

The nVent RAYCHEM EC-TS electronic thermostat is an
ambient, pipe, or slab sensing thermostat that is ideal for pipe
freeze protection, flow maintenance, freezer frost heave and
floor heating and snow melting applications. The EC-TS can
be used to control a single heat-tracing circuit or as a pilot to
control a contactor switching multiple heat-tracing circuits.

Thetemperature set point can be visually checked through the

clear lid, as can the LED indicators for alarm, power and heating

cable status. The stainless steel sensor makes it an ideal

thermostat for applications that require an embedded sensor.
The set point range for these thermostats is between 30°F

(–1°C) and 110°F (43°C). It operates at voltages between 100 to
277 Vac and switches current to 30 Amps.

For technical support call nVent at (800)545-6258.

APPROVALS

KIT CONTENTS

Item Qty Description

A 1 Lid
B 1 Wire cover
C 1 Box with electronics
D 1 25 foot temperature sensor
E 1 MI cable grounding kit (P000000279)
F 1 Pipe support bracket (optional; 707366)

This component is an electrical device that must be
installed correctly to ensure proper operation and to
prevent shock or fire. Read these important warnings
and carefully follow all of the installation instructions.

• To minimize the danger of fire from sustained
electrical arcing if the heating cable is damaged
or improperly installed, and to comply with the
requirements of nVent, agency certifications,

and the National Electrical Code, ground-fault
equipment protection must be used. Arcing may
not be stopped by conventional circuit breakers.

• Component approvals and performance are based
on the use of nVent-specified parts only. Do not
use substitute parts or vinyl electrical tape.

• The black heating cable core and fibers are
conductive and can short. They must be

TOOLS REQUIRED

• Large slotted screwdriver • Needle nose pliers

• Small slotted screwdriver

ADDITIONAL MATERIALS REQUIRED

• Appropriate mounting fasteners

• MI cable grounding kit (for direct connection of Pyrotenax

heating cables) Catalog No: MI-GROUND-KIT

A

B

C

properly insulated and kept dry.

• Damaged bus wires can overheat or short. Do
not break bus wire strands when scoring the
jacket or core.

• Keep components and heating cable ends dry
before and during installation.

• Use only fire resistant insulation materials, such
as fiberglass wrap or flame-retardant foam.

D

E

F

1

• Attach enclosure to the wall using the appropriate mounting
fasteners.

2A

Heating Cable using a Junction Box

Hole size

0.17 in (4.3 mm) x 4

Max. screw size 3/16 in (4.5 mm)

Connecting Heating Cable

• Insert the two power wires from the heating cable’s junction

box into the terminal block marked “To Heating Cable” and the
ground (braid) marked “Earth” and tighten terminals. Confirm
connection by pulling on the wires.

Remote

heating cable

Note: You must bring grounding wire from the MI junction box to the

controller for the ground-fault circuit breaker to work properly.

Mineral Insulated Heating Cable using a Direct Connection without a Separate Junction Box

2B

Heating cable
ground (braid)

Note: To ensure the MI heating cable is properly grounded, all MI
cables must be installed with a grounding kit, which is ordered
separately (P000000279). Failure to use the grounding kit will
void the warranty and can be a safety hazard by preventing
normal operation of the ground fault circuit breaker.

• Insert the two heating cable wires into the terminal block
marked “To Heating Cable” and the ground wire to “Earth” and
tighten terminals. Confirm by pulling on the wires.

Junction

box

Power In

Line

Power In

Line

Power

Terminal

Block

To

Heating

Cable

Neutral

Line

Neutral

Line

Power

Terminal

Block

To

Heating

Cable

Neutral

Line

Neutral

Line

Earth

Line

Earth

Line

2 | nVent.com

MI heating cable

Lock washer
Grounding strap
Conduit hub

3

Connecting Incoming Power

• Pull in 8 to 14 AWG power and ground wires, strip off 1/2
in (3 mm) of insulation and terminate. Confirm by pulling

on the wires.

¹⁄2 in

4 5

Preparing Sensor

• Cut the sensor lead wire to length.

• Being careful not to cut the wires, strip 1-1/2 inches of
outer jacket, trim off foil, to expose black white and non
insulated drain wire (ground/shield).

Power

Terminal

Block

To

Power In

Heating

Cable

Earth

Line

Neutral

Line

Neutral

Line

Line

GFPD

Ground

Power in

• Strip off 1/4 inch of insulation from black and white

wires. Do not cut the wire strands.

1-¹⁄2 in

6A 6B

Placing Sensor: Ambient Application

• Remove cap and grommet. Slide grommet over

temperature sensor and onto shrink tubing. Tighten cap.

Grommet

Sensor

Shrink tubing

Cap

¹⁄4 in

Placing Sensor: Pipe/Slab Application

• Remove cap and compression grommet. Slide cable

through cap, grommet and through side entry hole.

Tighten cap.

Cap

Sensor

Grommet

nVent.com | 3

7

Connecting Sensor

• Insert the three sensor wires into the terminal block
marked “Sensor Input.” Match the colors (White to W,
Black to B), and tighten terminals. Confirm connection by

pulling on the wires.

Finished Wiring Diagram

8

• Install wire cover.

• Turn pointer to the desired
set point.

• Install lid.

• Leave these instructions

Function LED color Description

Power Green When energized, indicates power to the controller
Sensor Red When energized, indicates shorted or open sensor
Htr On Green When energized, indicates power to the heating cable

with the end user for future
reference.

Heating cable using a junction box

Input

Shield

Power In

Line

Power

Terminal

Block

To

Heating

Cable

Neutral

Line

Neutral

Line

Earth

Line

ShieldBW

White

Sensor

Black

Sensor

Sensor

Sensor

Input

ShieldBW

Shield

Black

White

MI heating cable using
direct connection

Power

Terminal

Shield

Power In

Line

Block

Neutral

Line

To

Heating

Cable

Neutral

Line

Earth

Line

ShieldBW

Black

White

Self-regulating

heating cable

Heating cable
ground (braid)

North America

Tel [phone]
Fax [phone]

[e-mail]

Sensor

Junction box

Ground
Power in

GFPD

Europe, Middle East, Africa

Tel [phone]
Fax [phone]

[e-mail]

Grounding strap

Conduit hub

MI heating
cable

Asia Pacific

Tel [phone]
Fax [phone]

[e-mail]

Ground
Power in

GFPD

Latin America

Tel [phone]
Fax [phone]

[e-mail]

nVent.com

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nVent reserves the right to change specications without notice.

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