Submittal Sheet

F-11302-9 © Copyright 2008 TAC All Rights Reserved. 3
8. Straighten thermostat housing and tighten mounting
screws securely.
9. Make electrical connections 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 bushing threaded for standard 3/4" pipe fittings.
3. Remove cover, using care when handling bimetal
element, and insert element in bulb well.
4. Note that cutout of mounting flange on bulb well must be
at the top. This cutout allows clearance for scale setting
lock screw. Insert mounting screws provided through
keyhole slot in thermostat housing to engage
corresponding holes in bulb well mounting flange. Align
thermostat and tighten mounting screws securely.
5. Make electrical connections 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 action and terminal identification.
ADJUSTMENTS
See Figure 3.
Setpoint
The lever setting determines the setpoint of the thermostat.
The lever can be locked in place by tightening the dial setting
lock screw to prevent unauthorized resetting of thermostat
control point.
Differential
To increase the differential, bend the switch actuating cam up,
using a narrow screwdriver. A 1/32" (1 mm) upward bend at
the left end of the cam increases the differential approximately
2°F (1°C).
CHECKOUT
While media temperature is in the scale range of unit,
determine the media temperature, then move the scale slider
above and below the media setting and verify internal switch
action using a VOM.
CALIBRATION
The thermostats are factory calibrated and should not require
further attention. However, if a thermostat requires calibration,
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 power to thermostat and then remove thermostat
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 calibrating screw
either to the right or to the left (clockwise or
counterclockwise) as required until the switch clicks.
4. Rotate the calibrating screw in the opposite direction until
the switch clicks again.
5. Set calibrating screw halfway between point where switch
clicks [one full turn of calibrating screw represents
approximately 10°F (6°C)].
6. Re-install all electrical connections and replace
thermostat cover.