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Application
For line voltage on- off control of media t emperatures in ducts,
tanks, liquid lines, pipes, etc.
Specifications
Setpoint Dial Range: See T ab les 1 and 2.
Sens ing Ele m ent: Helical bimetal.
Differential: See Tables 1 and 2.
Shipping Ambient Temperature Limits: -40 to 160°F (-40
to 71°C).
Electrical Switch: See Tables 1 and 2.
Connections: Coded terminals.
Cover: Beige painted steel case wit h 1/2" conduit opening.
Locations: NEMA Type 1 indoor only.
Mounting: In any position on any surface not subject to
excessive vibration. For immersion mounting AT-223 will is
required. Extension mounting bracket (provided) is required
by UL for duct installation of TA-3434 and TC-3413.
Dimensions:
Case, 5-3/8" high x 3-1/2" wide x 1-7/8" deep (136 mm x
89 mm x 48 mm).
Element, 1/2" diameter x 7-1/2" insertion length, overall
length 9-3/8" (131 mm x 191 mm x 238 mm).
ACCESSORIES
AT-223 Brass bulb well (see below)
TA-3432, TA-3433, TA-3434,
TA-3441, TC-3411, TC-3413
Duct and Immersion Electric Thermostats
General Instructions
Figure-1 Switch Action and Terminal Identificat ion.
Table-1 Specifications.
Functional
Part
Number
TA-3432
TA-3433
TA-3434
TA-3441
a
Units dual marked °F and °C.
b
Reset cannot be accomplished until the sensed temperature is at least 5°F (3°C) below setpoint.
c
Reset cannot be accomplished until the sensed temperature is at least 5°F (3°C) above setpoint.
Printed in U.S.A. 9/08 © Copyright 2008 TAC All Rights Reserved. F-11302-9
Device Type
High temp.
manu al res e t
High temp.
manu al res e t
High temp.
manu al res e t
Low temp.
manu al res e t
Setpoint Dial
Range
°F (°C)
75 to 13 5 (23
to 57)
100 to 16 0
(38 to 71)0 (-18)
120 to 24 0
(49 to 116)20 (-7)
35 to 59 (1.7
to 15)
a
Sensor
Ambient
°F (°C)
Min. Max.
-25
(-32)
-40
(-40)
235
(113)
260
(127)
300
(149)
159
(71)
Differential
°F (°C)
b
Fixed
10 (5)
b
Fixed
5 (3)
b
Fixed
10 (5)
c
Fixed
10 (5)
Switch Type Voltage
SPST opens on
temp. rise
SPST opens on
temp. rise
SPST opens on
temp. rise
SPST opens on
temp. drop
120 16 96
240 8 48
120 16 96
240 8 48
120 16 96
240 8 48
120 16 96
240 8 48
Full
Load
Amps
Locked
Rotor
Amps
Pilot
Duty
(VA)
720
720
720
720
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Table-2 Specifications for Obsolete Models.
Functional
Part
Number
TC-3411
TC-3413
a
Units dual marked °F and °C.
b
TC-3411 and TC-3413 are not CSA certified.
Device Type
Low temp.
b
automatic
High temp.
b
automatic
reset
reset
Setpoint
Dial Range
°F (°C)
0 to 120
(-18 to 49 )
120 to 24 0
(49 to 116)
a
Sensor
Ambient
°F (°C)
Min. Max.
-40
(-40)
20
(-7)
220
(104)
300
(149)
Differential
°F (°C)
Adj. 2 to 8 (1
to 4) Fact ory
set 2 (1)
Adj. 2 to 8 (1
to 4) Fact ory
set 2 (1)
Switch Type Voltage
120 3.8 22.8
SPDT
SPDT
240 1.9 11.4
120 3.8 22.8
240 1.9 11.4
Full
Load
Amps
Locked
Rotor
Amps
Pilot Duty
(VA)
125
1254
AT-223 BRASS BULB WELL
Construction: Brass.
Connection: 3/4" MNPT.
Dimensions: 7-1/2" (191 mm) insertion length.
PRE-INSTALLATION
Inspection
Inspect the car ton for damage. If damaged, not if y the
appropriate carrier immediately. Inspect the device for
obvious damage. Return damaged products.
Required Installation Items
• Wiring diagrams
• Tools (not provided):
VOM (volt-ohm meter)
Appropriate screwdriver for mounting screws and
terminal connections
• Appropriate dri ll and drill bit for mounting scr ews
• Appropriate accessories
• Mounting screws:
(3) #8 x 3/4 sheet metal, pr ovided with extensio n
mounting bracket wit h TA-3434 and TC-3413
(2) #8-32 x 3/8" round head, provided for all model s
INSTALLATION
Caution:
1. Installer must be a qualified, experienced techn ician.
2. Make all connections in accordance with the wiring
diagram, and in accordance with national and local
electrical codes. Use copper conductors only.
3. Do not exceed ratings of the device.
Mounting
The thermostats may be mounted in any position. The
sensitive heli cal bi metal el ement may be mount ed in duct s or,
with optional bul b well , in liquid lines, pipes, tanks, etc.
Duct Installation
1. Cut a 3/4" (19 mm) diameter hole in the duct where the
thermostat is to be located.
2. Remove the cover and carefully insert the bimetal in the
duct opening. Mark position for the two mountin g screws
provided and punch or drill holes.
3. Partially insert scr ew s.
4. Insert the bimetal elem ent; rotat e the t hermos tat ho using
countercloc kwise to engage screw heads in key hol e
slots.
5. Straighten thermostat housing and tighten mounting
screws securely.
6. Make electrical connecti ons and replace thermostat
cover.
Duct Installation with Extension Mounting
Bracket
See Figure 2.
Caution:
installati on by UL on units where the control range exceeds
180°F (82°C) (typically TC-3413 and TA-3434).
1. Cut a 3/4" (19 mm) diameter hole in the duct where the
2. Use the extension bracke t a s a templ ate t o mar k pos ition
3. Punch or drill holes for the extension bracket.
4. Secure the extension bracket to t he duct with the three (3)
5. Partially thread the two #8-32 x 3/8" ro und head screws
6. Remove the cover from the thermostat.
7. Insert the bimetal element into the hole i n the duct; rotat e
Extension mountin g bracket is required for duct
thermostat is to be located.
for three mounting holes.
#8 x 3/4" screws provided.
provided into the extension bracket.
the thermostat housing counterclockwise to engage
screw heads in ke y h ole slots.
2 © Copyright 2008 T AC All Rights Reserved. F-11302-9
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8. Straighten thermostat housing and tighten mounting
scre w s se c u rely.
9. Make electrical connecti ons and replace thermostat
cover.
Figure-2 Duct Installation with Extension Mounting Bracket,
TA-3434 and TC-3413 Only.
Immersion Installation
1. The AT-223 bulb well (purchased separately) positions the
thermostat mechanism housing 2" (51 mm) away from
pipe or tank wall to allow for insulation.
2. Insert the bulb well in pipe line or tank where it will be
exposed to a representative temperature of the medium
being controlled. The bulb well is furnished with a
mounting bush in g thr eaded for standa rd 3/4" pipe f itt ings.
3. Remove cover, using care when handling bim etal
element, and insert element in bulb well.
4. Note that cutout of m ounting flange on bulb well m ust be
at the top. This cutout allows clearance for scale setting
lock screw. Insert mounting screws provided through
keyhole slot in ther m ostat housing to engage
correspondi ng holes in bulb well mounting flange. Align
thermostat and t ighten mounting screws securely.
5. Make electrical connecti ons and replace thermostat
cover.
WIRING
Terminals are located under thermostat cover. Knockouts for
1/2" conduit connectors at top of case.
See Figure 1 for switch act ion and terminal identification.
ADJUSTMENTS
See Figure 3.
Setpoint
The lever setting determines the setpoint of t he thermostat.
The lever can be locked in place by tight eni ng the dial set ting
lock screw to prevent unauthorized resetting of thermostat
control point.
Differential
To increase t he diffe rential, bend the swi tch actu ating cam u p,
using a narrow screwdriver. A 1/32" (1 mm) upward bend at
the left end of the cam increa ses the differential approximately
2°F (1° C ).
CHECKOUT
While media temperature is in the scale range of unit,
determine the media te mperatur e, then move th e scale sl ider
above and below the media setting and verify internal switch
action using a VOM.
CALIBRATION
The thermostats are fac tory ca libr ate d and shoul d no t requir e
further attenti on. However, if a the rmostat requires ca libration,
proceed as follows:
1. Set the temperature lever to correspond to actual
temperature of medium being controlled. Use and
accurate thermometer and allow both thermometer and
thermostat to settle out for approximately ten minutes.
2. Turn off p ower to the rmostat and then rem ove thermost at
cover.
3. Insert a narrow blade screwdriver from upper left-hand
corner and turn calibrating screw clockwise to lower
control point temperature, and counterclockwise to raise
control point temperature. Turn the calib rating screw
either to the right or to th e lef t (c lockwise or
counterclockwi se) as required until the switch clicks.
4. Rotate the ca librating s crew in the opposite dire ction unti l
the switch clicks again.
5. Set calibrat ing screw half way between point where switch
clicks [one full turn of calibrating screw represents
approximately 10°F (6°C)].
6. Re-instal l al l electrical connections and replace
thermostat cover.
F-11302-9 © Copyright 2008 TAC All Rights Reserved. 3
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MAINTENANCE
Regular maintenance of the total system is recommended to
assure sustai ned optimum performance.
FIELD REPAIR
Do not field repair the th ermostat. If the system is not
operating cor rectly and the rea son is traced to the t hermostat,
it should be replaced.
4 © Copyright 2008 T AC All Rights Reserved. F-11302-9
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F-11302-9 © Copyright 2008 TAC All Rights Reserved. 5
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6 © Copyright 2008 T AC All Rights Reserved. F-11302-9
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F-11302-9 © Copyright 2008 TAC All Rights Reserved 7
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Copyright 2008, TAC
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.
F-11302-9
TAC
1354 Clifford Avenue
P.O. Box 2940
Loves Park, IL 61132-2940
www.tac.com
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