7
Step 4 - Final Assembly
• Install actuator cover onto the actuator. Using a Phillips screwdriver, tighten
the two screws.
• Install the scale plate.
• For clockwise to open installations, face scale plate with 0 on the left and 1
on the right.
• For counterclockwise to open installations, face scale plate with 1 on the left
and 0 on the right.
• Install actuator handle onto the actuator spline.
• Install actuator screw through hole in the handle. Using a flat head screw-
driver, tighten until snug. Do not overtighten.
Testing and Troubleshooting
The actuator motor includes a manual override.
To engage manual operation, use
a flat blade screwdriver and set the
manual override dial to the “hand”
position.
Use the handle to manually adjust the
valve position. When the handle is
set to 0, the valve should be closed
and there should be no heat transfer.
When the handle is set to 1, the valve
should be fully open and there should
be heat transfer.
To return to automatic operation,
use a flat blade screwdriver and set
the manual override dial to the “A”
position.
0
.2 .4 .6 .8 1
0
.2 .4 .6 .8 1
Manual
override
dial
Actuator Motor 743
Literature
ES-T-743, IOM-T-743
Packaged weight
1.1 lbs (500 g)
Dimensions
3-5/8" H x 3-1/8" W x 3-9/16" D (93 x 80 x 90 mm)
Enclosure
Polycarbonate plastic, NEMA type 1
Ambient conditions
Indoor use only, 32 to 122°F (0 to 50°C), 95% RH non-condensing
Power supply
24 V (ac) ± 10%, 60 Hz, 1.5 VA, Class 2
Control signal input
24 V (ac), floating action
Angle of rotation
Electrically limited to 90° shaft rotation
Motor speed
117 seconds at 60 Hz
Rated torque
88 in•lbs (10 N•m)
Technical Data
