Pentair DigiTrace AMC-2B-2 User manual

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AMC-2B-2
Double pole line-sensing thermostat for nonhazarDous locations
installation instructions
THERMAL MANAGEMENT SOLUTIONS EN-DigiTraceAMC2B2-IM-H5691001/13
DEScRIpTION
The DigiTrace AMC-2B-2 thermostat is designed for controlling
heat-tracing systems in nonhazardous locations. The thermostat
functions as a DPST switch.
The DPST switch will enable and disable current flow in both
buses of the heat-tracing cable.
The AMC-2B-2 can be used to control heat-tracing circuits in a
pipe-sensing mode directly (see Figure 1 on back).
Note: Do not use this thermostat to control two separate heat-
tracing circuits.
ADDITIONAL MATERIAL REqUIRED
• AT-180aluminumtape
AppROvALS
SpEcIfIcATIONS
Enclosure NEMA 4X, polyurethane-coated cast-
aluminum housing, stainless-steel hardware
Entries One 3/4 in. NPT conduit hub
Set point range 25°F to 325°F (–4°C to 163°C)
Sensor exposure
limits
–40°Fto420°F(–40°Cto215°C)
Housing exposure
limits
–40°Fto160°F(–40°Cto71°C)
Switch DPST
Electrical rating 22Aat208/240Vac
Relay coil 208–240Vac,4VA
Accuracy ±6°F (±3.3°C)
Deadband 2°Fto12°F(1.1°Cto6.7°C)aboveactuation
temperature
Set point
repeatability
±3°F(±1.7°C)
Sensor type Fluid-filled(silicone)bulband9ft(2.7m)
capillary
Sensor material 300seriesstainlesssteel
Connection
terminals
Screwterminals,10–14AWG(2–5mm2)
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.
WARNING:
3⁄4 in NPT conduit entry
6.0 in (152 mm)
0.3 in (9 mm)
0.8 in
(20 mm)
Terminal
block
Ø.28 in (7 mm)
mounting holes (2X)
1.2 in
(30 mm)
4.0 in
(102 mm)
4.5 in
(114 mm)
5.6 in
(142 mm)
4.5 in (114 mm)
4.0 in (102 mm)
8.0 in
(202 mm)
Adjusting
knob
Removable
knob cover

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© 2001-2013 Pentair. PN D55692-000
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Pentair, DigiTrace and AMC are owned by Pentair or its global affiliates. All other trademarks are the property of their respective owners. Pentair reserves
the right to change specifications without prior notice.
Figure 1. Heat-tracing control
Circuit1
Circuit2
GØØ
Heating
cable
Power
connection
Thermostat bulb
(see "Positioning"
instructions above
for mounting details)
Braid
Control
thermostat
Relay
GFEPD
Power supply
208-V or 240-V supply – 240-V heater
GØØ
WIRING
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.
3. Mounttheunitusingunistrutorthe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 diagram
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.
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 from Pentair Thermal Management)
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 Pentair Thermal
Managementat(800)545-6258.
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.
Conduit
drain
90 Heating cable
Control thermostat bulb
AT-180 tape
AT-180 tape
Heating cable
Control thermostat bulb
Double traced
Single traced