Raychem AMC1B Installation Manual

WARNING:

8.0 in

(202 mm)

AMC-1B

Line-Sensing Thermostat for Nonhazardous Locations
Installation Instructions

DESCRIPTION

The nVent RAYCHEM AMC-1B thermostat is designed for
controlling heat-tracing systems in nonhazardous locations.
The AMC-1B can be used to control heat- tracing circuits
in a pipe-sensing mode (see Figure 1 on back), to indicate
low-temperature (Figure 2) or high temperature (Figure 3)
alarm conditions, or to control the coil on a contactor (Figure 4).

APPROVALS

SPECIFICATIONS

Enclosure Type 4X, polyurethane-coated cast-

Entries One 3/4 in. NPT conduit hub
Set point range 25°F to 325°F (–4°C to 163°C)
Sensor exposure

limits
Housing exposure

limits
Switch SPDT
Electrical rating 22 A at 125/250/480 Vac
Accuracy ±6°F (±3.3°C)
Deadband 2°F to 12°F (1.1°C to 6.7°C) above actuation

Set point
repeatability

Sensor type Fluid-filled (silicone) bulb and 9 ft (2.7 m)

Sensor material 300 series stainless steel
Connection

terminals

aluminum housing, stainless-steel hardware

–40°F to 420°F (–40°C to 215°C)

–40°F to 160°F (–40°C to 71°C)

temperature
±3°F (±1.7°C)

capillary

Screw terminals, 10–14 AWG (2–5 mm2)

4.5 in (114 mm)

4.0 in (102 mm)

Removable
knob cover

Terminal

block

3⁄4 in

NPT conduit entry

Adjusting
knob

3.0 in (76 mm)

0.3 in

(9 mm)

R

4.0 in

(102 mm)

4.5 in

(114 mm)

Ø.28 in (7 mm)
mounting holes (2X)

1.2 in

(30 mm)

0.8 in

(20 mm)

5.6 in

(142 mm)

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

Component approvals and performance are based on the use
of specified parts only. Do not use substitute parts or vinyl
electrical tape to make connections.

THERMOSTAT INSTALLATION INSTRUCTIONS

Conduit
drain

90

Heating cable

Control thermostat bulb
AT-180 tape

AT-180 tape

Heating cable

Control thermostat bulb

Double Traced

Single Traced

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.

3. Mount the unit using unistrut or the nVent RAYCHEM
Universal Mounting Bracket (UMB-263757) in a position that
prevents condensation from draining into the enclosure from
the connecting conduit (see diagram above).

POSITIONING THE SENSOR BULB

4. 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.

WIRING

5. Tape the bulb firmly to the pipe with AT-180 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 AT-180 tape.

6. For metal-tank-wall sensing, use the BCK-35 bulb clamp
(purchased separately) and install the clamp per the
instructions provided. Make sure there is no air space between
the tank wall and the bulb.

For installation on plastic tanks, contact nVent at

[phone].

SETTING THE THERMOSTAT

7. Set the thermostat dial to the desired temperature, then finish
wiring.

8. Complete insulating. Do not turn the system on until the bulb
is covered with thermal insulation.

9. Fill the piping or tank. Once the thermostat has begun to cycle,
check the fluid temperature with an immersed thermostat
(best for plastic systems) or an accurate temperature
indicator. Adjust the dial setting, if necessary.

Power Supply

GFEPD

ØØ

208-V or 240-V supply – 240-V cable

or

G

120-V supply – 120-V cable

N

Ø

277-V supply – 240-V cable

C
NO NC

Power

G

connection

Thermostat bulb

Braid

(see "Positioning"

instructions above

for mounting details)

Heating
Cable

North America

Tel [phone]
Fax [phone]
[e-mail]

Power Supply

GFEPD

208-V or 240-V supply

ØØ

or

ØGN

120-V or 277-V supply

Control
thermostat

Alarm

for mounting details)

Figure 2. Low-temperatu re alarm

Europe, Middle East, Africa

Tel [phone]
Fax [phone]
[e-mail]

C

NO NC

Thermostat bulb

(see "Positioning"

instructions above

Control
thermostat

Power Supply

GFEPD

208-V or 240-V supply

ØØ

or

ØGN

120-V or 277-V supply

C
NO NC

Alarm

Thermostat bulb

(see "Positioning"

instructions above

for mounting details)

Figure 3. High-temper ature alarm

Asia Pacific

Tel [phone]
Fax [phone]
[e-mail]

Control
thermostat

Power Supply

GFEPD

GCNANBN

C

Braid

Heating

cable A

Heating
cable B

Figure 4. Contract contolFigure 1. Pipe-sensing

For switching heat-tr acing loads greater than 22 A
or switching multiple heat-t racing circuits.

120-V supply – 120-V heating cable or

Ø

ØBØ

C

A

277-V supply – 240-V heating cable

120-V or
277-V
coil

Heating
cable C

NONC

C

NONC
C

Thermostat bulb
(see "Positioning"
instructions above
for mounting details)

Latin America

Tel [phone]
Fax [phone]
[e-mail]

Control
thermostat

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