ML7425A,B Spring Return Electric Linear Valve Actuator PRODUCT DATA FEATURES • Quick and easy installation. • No separate linkage required. • ML7425A extends actuator stem on power failure; ML7425B retracts actuator stem on power failure. • Conduit connector is standard. • No adjustments required. • True spring return on power failure. • Accurate valve positioning. • Low power consumption. • High close-off ratings. • Force-limiting end switches. APPLICATION The ML7425A,B Spring Return Electric Linear Valve Actuators are modulating control actuators used with controls that provide an analog output of 0 to 10 Vdc or 2 to 10 Vdc. These actuators operate standard Honeywell valves in heating, ventilating, and air conditioning (HVAC) applications. An internal selector plug can be used to reverse the direction of action. • 0 to 10 Vdc or 2 to 10 Vdc signal input. • Position feedback signal. • Direct/reverse action. • Fail-safe position selection. • Synchronous motor. • Corrosion resistant design. • Maintenance free. Contents Application ........................................................................ Features ............................................................................ Specifications .................................................................... Ordering Information ......................................................... Installation ......................................................................... Operation .......................................................................... Checkout ........................................................................... ® U.S. Registered Trademark Copyright © 1996 Honeywell Inc. • All Rights Reserved X-XX UL 1 1 2 2 3 7 8 63-2518-1 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR Maximum Valve Medium Temperature: 300°F (150°C) SPECIFICATIONS Models: Model Description Spring Return Action ML7425A Electric Linear Valve Actuator Extends actuator stem on power failure ML7425B Humidity: 5 to 95 percent relative humidity, noncondensing Close-off Pressure Ratings: See Tables 1 and 2. Retracts actuator stem on power failure Protection Standard: IP54 Electrical Ratings: Power Input: 24 Vac (+10%, -15%), 60 Hz Power Consumption: 12 VA maximum at 24 Vac Insulation: Class II (24 Vac) Signal Inputs: 0 to 10 Vdc or 2 to 10 Vdc Approvals: UL94-5V Flame Retardant Meets CE standards Signal Source Output Resistance: 1K ohm maximum Cable Entry: Conduit connector and one knockout are standard on actuator case. Load: 1 mA maximum Stem Force: 135 lbf (600N) Actuator Material: Cover: ABS-FR plastic Yoke and Base: Diecast aluminum Actuator Stroke: 3/4 in. (20 mm) Weight: 5.1 lb (2.3 kg) Actuator Run Time at 60 Hz: ML7425A: 90 seconds ML7425B: 90 seconds Dimensions: See Fig. 1. Accessories: 43191679-112 Single Auxiliary 220 ohm Potentiometer for ML7425A/B 43191679-111 Single Auxiliary 10K ohm Potentiometer for ML7425A/B 43191680-105 Dual Auxiliary Switch for ML7425A,B (for 24 Vac use only) 43196000-101 High Temperature Kit. Includes 1/4 in. and 3/8 in. stem extenders. The kit increases the temperature range to 428°F (220°C). Spring Return Time: 12 seconds Ambient Temperature Range: 14°F to 122°F (-10°C to +50°C) Storage Temperature Range: -40°F to +158°F (-40°C to +70°C) ORDERING INFORMATION When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Home and Building Control Sales Office (check white pages of your phone directory). 2. Home and Building Control Customer Logistics Honeywell Inc., 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 (612) 951-1000 In Canada—Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 2C9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A. 63-2518—1 2 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR Table 1. Close-off ratings in psi for ML7425A,B Electric Linear Valve Actuators and V5011, V5013 Valves. Valve Type 1/2 in. 3/4 in. 1 in. 1-1/4 in. 1-1/2 in. 2 in. 2-1/2 in. 3 in. V5011A Flange N/A N/A N/A N/A N/A N/A 28 16 V5011F Screw 150 150 150 145 86 49 28 16 V5011G Screw 150 150 150 134 77 49 28 16 V5013B Flange N/A N/A N/A N/A N/A N/A 21 14 V5013C Flange N/A N/A N/A N/A N/A N/A 21 14 V5013F Screw 150 150 150 126 77 49 N/A N/A Table 2. Close-off ratings in psi for ML7425A,B Electric Valve Actuators and V3350,1; V3360,1; V3450,1; V3460,1 Valves. 5-5/15 6-5/16 (135) x (161) Valve Model 2-11/16 (67) V3350, V3351, V3360, V3361, V3450, V3451, V3460, V3461 a Valve Size in in. 2-1/2 3 4 5 6 Close-Off Rating psi (kPa)a 135 lbf (600 N) 21 (145) 14 (97) — — — Represents maximum pressure difference between the outlet and either of the two inlets. 14-5/16 (364) INSTALLATION When Installing this Product... 1. Read instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. 2. Check ratings and description given in the specifications to make sure the product is suitable for your application. 3. Installer must be a trained, experienced service technician. 4. After installation is complete, check out product operation as provided in these instructions. 11-1/4 (284) 1/2 (13) FPT 7-5/8 (192) YOKE DIAMETER 1-3/8 (35) CAUTION Disconnect power before installation to prevent electrical shock or equipment damage. Location M7892 Install the actuator in a location that allows enough clearance for mounting accessories and for servicing. See Fig. 1. Fig. 1. Approximate dimensions of ML7425A,B Electric Linear Valve Actuator in in. (mm). CAUTION Do not install the actuator in a position below horizontal to minimize risk of damage to actuator in the event of condensation or a valve gland leak. Mounting A Place the actuator on the valve with the U-bolt around the valve collar. See Fig. 2. 3 63-2518—1 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR E Release the stem button retaining clip to secure the stem button. Check to make certain the stem button is secured by the retaining clip. F Remove the cover from the actuator, using a Phillips or crosspoint screwdriver. See Fig. 4. CAUTION The manual spring handle is under tension and can turn quickly when lifted, pinching fingers between the handle and plastic casing, which can result in injury. Maintain handle orientation while lifting and remove fingers quickly when releasing. G Remove manual spring handle retaining clip and lift and release the handle. See Fig. 5. The easiest way to safely perform this operation is to: — remove the retaining clip, then — wedge a small, flat-bladed screwdriver under the manual spring handle at the point marked in Fig. 5 and pry up the handle. M6632 Fig. 2. Attaching the actuator to the valve collar. B Place the U-bolt against the valve collar and secure the actuator to the valve by turning each U-bolt nut clockwise. To assure even pressure on the collar, first tighten the nuts finger-tight and then alternate turning each U-bolt nut until both are snug. C Push aside the stem button retaining clip and hold. See Fig. 3. M6627 Fig. 4. Removing ML7425 cover. M6633 Fig. 3. Securing ML7425 to valve. D Lift the valve stem until the head of the valve stem button is inside the large slot of the stem button retaining clip on the actuator. 63-2518—1 M6629 Fig. 5. Removing spring retaining clip and releasing manual spring handle. 4 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR ML7425 Wiring CAUTION Disconnect power supply before starting wiring to prevent electrical shock or equipment damage. WIRING STRIP 2 F F + – + INPUT (FEEDBACK) OUTPUT 3 – T2 T1 All wiring must comply with local electrical codes, ordinances and regulations. Voltage and frequency of the transformer used with the ML7425 must correspond with the characteristics of the power supply and those of the actuator. See Fig. 7 through 11 for typical wiring hookups. O1 O2 TS A Feed power and control wires through the conduit connector located on the bottom of the actuator case. See Fig. 6. L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL FEEDBACK SECTION. 3 0-10 Vdc OR 2-10 Vdc CONTROL SIGNAL (SEE W2). C8286A Fig. 7. ML7425 wiring diagram using feedback output from another controller with one transformer. ML7425 WIRING STRIP SENSOR 1 2 3 4 5 6 F M6630 L1 (HOT) L2 1 + – Fig. 6. Connecting power and control wiring to ML7425. T2 CAUTION DUAL TRANSFORMERS 3 2 1 T1 O1 If conduit connector is to be removed, use a wrench to support the metal connector when tightening or removing the conduit pipe. O2 TS T775 (WITH 2-10 VDC OUTPUT) L1 (HOT) L2 1 B Using the wiring diagrams in Fig. 7 through 11, connect power and control wires to the ML7425. Make sure that all wiring is correct. C When wiring is complete, replace the cover on the ML7425. See Fig. 12. 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M7894 Fig. 8. ML7425 wiring diagram using a 2 to 10 Vdc output control (e.g., T775) with two transformers. NOTE: Make the selector plug changes, if required, before replacing the cover. See Fig. 13. ML7425 D Apply power and control signals to the ML7425. WIRING STRIP SENSOR 1 2 3 4 5 6 F L1 (HOT) L2 1 + – T2 3 2 1 T1 SINGLE TRANSFORMER 40 VA 24 VAC O1 O2 TS 1 T775 (WITH 2-10 VDC OUTPUT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M7895 Fig. 9. ML7425 wiring diagram using a 2 to 10 Vdc output control (e.g., T775) with one transformer. 5 63-2518—1 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR ML7425 WIRING STRIP SENSOR 1 2 3 4 5 6 F L1 (HOT) L2 1 + – T2 DUAL TRANSFORMERS 3 2 1 T1 O1 500 OHM RESISTOR O2 TS T775 (WITH 4-20 MA OUTPUT) L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M7896 Fig. 10. ML7425 wiring diagram using a 4 to 20 mA output control (e.g., T775) with two transformers. ML7425 WIRING STRIP SENSOR 1 2 3 4 5 M6628 6 F L1 (HOT) L2 1 + – T2 Fig. 12. Replacing cover on ML7425. Auxiliary Potentiometers DUAL TRANSFORMERS 3 2 The 43191679 Auxiliary Potentiometers can be used as feedback potentiometers and to provide remote indication of the valve position. See the installation instructions packed with the potentiometers. 1 T1 O1 O2 TS T775 (WITH 2-10 VDC OUTPUT) L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Auxiliary Switches The 43191680 Dual Auxiliary Switch can be used on both the ML7425A and ML7425B Electric Linear Valve Actuators. Switching points are adjustable over the full length of the actuator stroke; for example, the switch can be used to switch pumps or to provide remote indication of any stroke position. See the Installation Instructions packed with the auxiliary switch. M7894 Fig. 11. ML7425 wiring diagram using a 4 to 20 mA output control (e.g., T775) with one transformer. CAUTION Use the 43191680 Dual Auxiliary Switch only with 24 Vac applications. 63-2518—1 6 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR OPERATION Output Signal Feedback (F) General An analog output signal (2 to 10 Vdc) that represents the actual actuator stem position is available at Terminal F. It can be used for remote indication of the stem position. When the actuator stem is fully extended, the output signal is 10 Vdc. In the ML7425, the drive of a synchronous motor is converted into the linear motion of the actuator stem by using a spur gear transmission. A button retainer clip connects the actuator stem to the valve stem. When the actuator stem is up, the output signal is 0 or 2 Vdc. The output of the signal does not change when the action of the actuator is reversed using W3. See Direction of Action. An integrated spring package limits the stem force to a factory-adjusted value in either direction. Installed microswitches turn off the actuator when the specified stem force is reached. Actuator Override The converter output signal override function can be used in freeze protection or similar applications. It forces the actuator to a specific position, overriding the control signal. To exercise this function, disconnect the 24 Vac common from the actuator (⊥ or T2) and connect it to either Terminal O1 or O2. Connecting to Terminal O1 fully extends the actuator stem. Connecting to O2 fully retracts the actuator stem. The ML7425A,B Spring Return Valve Actuators provide a safety valve position in event of power failure. On power failure, the ML7425A returns the stem to the bottom position. On power failure, ML7425B returns the stem fully upward. The ML7425 actuators are shipped from the factory with a spring handle retaining clip installed, so that the actuator can be connected to the valve without applying power. This clip is removed after the actuator is installed on the valve. See Installation section. The control signal (+) is ignored when the override signal is applied to Terminal O1 or O2. This override can be achieved with a switch or a relay. See Fig. 14. ML7425 WIRING STRIP Signal Input (+) The analog input signal (+) range is set at the factory to 0 to 10 Vdc. Changing the position of the W2 selector plug sets the range to 2 through 10 Vdc. Selector plugs W1, W2, and W3 are positioned on the back side of the internal label holder. See Fig. 13 for location of the selector plugs. 2 F F + – + INPUT (FEEDBACK) OUTPUT – T1 O1 W1 W3 3 T2 SP3T OVERRIDE SWITCH O2 W2 4 TS 10V 0% 50% 100% 2 ... 10V 0 ... 10V L1 (HOT) L2 1 10V 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL FEEDBACK SECTION. 3 0-10Vdc OR 2-10 Vdc CONTROL SIGNAL (SEE W2). 4 SEE OVERRIDE SECTION FOR DETAILS ON OVERRIDE OPERATION. M7906 Fig. 14. Connections for overriding control signal to drive actuator to a specific position. M6631 Fig. 13. Location of W1, W2 and W3 selector plugs. Signal Input Failure Direction of Action Using selector plug W1, the actuator can be set to run to one of three positions in event of a signal failure: 0% — Actuator position corresponds with 0 or 2 Vdc signal 50% — Actuator stem in mid-position 100% — Actuator position according to 10 Vdc signal W1 is factory set at the mid-position. The direction of the actuator action can be changed by repositioning selector plug W3, which is factory set so that the stem extends on increasing signal and retracts on decreasing signal. When the actuator stem is up, the output signal from the feedback (F) function is 0 or 2 Vdc. The output of the signal does not change when W3 is used to reverse the action of the actuator. See Fig. 13. 7 63-2518—1 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR Controller Checkout CHECKOUT The ML7425 Electric Linear Valve Actuator can be checked out either directly or by using a controller. Direct Checkout A Mount the actuator for the required application (see Installation section). B Check the valve position and make sure that 24 Vac is correctly applied to the actuator. C Apply the control signal to the appropriate leadwires to move the valve in the opposite direction. D If the actuator does not move, make sure the actuator is properly installed/wired. E If the actuator installation and wiring are both correct and the actuator does not run, replace the actuator. A Adjust the setpoint of the controller to call for opening the valve. Observe the actuator. B If the valve is closed, it should begin to open. C If the valve remains closed, move the setpoint further toward the open setting. D If the valve does not move, check for 24 Vac in the actuator power input. E If 24 Vac is present and the actuator does not operate, check the voltage across the controller leadwires to determine if the device is miswired. F If the wiring is correct, 24 Vac is present on the power input terminals, and the actuator does not run, replace the actuator. Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis MN 55408-0524 Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 2C9 Honeywell Latin American Division Miami Lakes Headquarters 14505 Commerce Way Suite 500 Miami Lakes FL 33016 Honeywell Europe S.A. 3 Avenue du Bourget B-1140 Brussels Belgium Honeywell Asia Pacific Inc. Room 3213-3225 Sun Hung Kai Centre No. 30 Harbour Road Wanchai Hong Kong Helping You Control Your World® 63-2518—1 C.H. Rev. 10-96 Printed in U.S.A. 63-2518—1 Printed on recycled paper containing at 8 least 10% post-consumer paper fibers.