742_D 10/13 Actuator Motor 742 Accessories Replaces: 08/13 Installation & Operation Manual Introduction The Actuating Motor 742 uses a 0-10 or 2-10 V (dc) signal to adjust the position of a mixing valve. It is compatible with tekmar brass mixing valves 710 to 724. It provides 88 in•lbs (10 N•m) of torque over a 90° rotation. The rotation direction is selected by a toggle switch. 0 .2 .4 .6 .
It is the installer’s responsibility to ensure that this control is safely installed according to all applicable codes and standards. This electronic device is not intended for use as a primary limit control. Other controls that are intended and certified as safety limits must be placed into the control circuit. tekmar Control Systems is not responsible for damages resulting from improper installation and/or maintenance. Read this Manual BEFORE using this equipment.
Step 1 - Rough In Wiring Pull two conductor 18 AWG LVT cable, up to 500 feet (150 m) for the following: • 24 V (ac/dc) power supply • 0-10 or 2-10 V (dc) control signal from control Strip wire to 3/8" (10 mm) for all terminal connections. Step 2 - Mounting • Using a Phillips screwdriver, remove the two screws in the corners of the actuator cover. Remove the cover. • Thread the anti-rotation bolt into one of the threaded holes on the mixing valve.
Step 3 - Wiring Conduit Connector Pull wires through conduit connector and provide enough wire length to connect to wiring terminals. Tighten the conduit connector nut. --------------------------------------------------------------------Power Supply -If using a 24 V (ac) power supply: • Connect C to terminal 1. • Connect R to terminal 2. If using a 24 V (dc) power supply: • Connect the power supply negative (–) to terminal 1. • Connect the power supply positive (+) to terminal 2.
Step 4 - Switch Settings Switch 1 -------------------------------------------------------------------------------------------------------Function Switch 1 Position Counterclockwise to open valve Right (factory default) Clockwise to open valve Left Switch 2 -------------------------------------------------------------------------------------------------------Function Switch 2 Position 2-10 V (dc) signal Right (factory default) 0-10 V (dc) signal Left CW 0-10 V CCW 2-10 V 5 of 8 © 2013 742_D -
Step 5 - 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 screwdriver, tighten until snug.
Technical Data Actuating Motor 742 0-10 V (dc) Literature 742_C, 742_D 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 noncondensing Power supply 24 V ± 10% (ac/dc), 2.
Limited Warranty and Product Return Procedure Limited Warranty The liability of tekmar under this warranty is limited. The Purchaser, by taking receipt of any tekmar product (“Product”), acknowledges the terms of the Limited Warranty in effect at the time of such Product sale and acknowledges that it has read and understands same.
