Honeywell ML6874 user manual

Summary of the content on the page No. 1

ML6874
Valve Actuator
PRODUCT DATA
FEATURES
• Allows the use of one common transformer
power supply for multiple actuators and
controllers
• Self-contained, motorized valve linkage
• Linkage self-adjusts to valve stroke of up to
19mm (3/4")
• Multipose mounting
• Strong valve seat closing force 710 Newton
(160 lbs.)
• Compact size for easy installation in
confined area
• Field-configurable DIP switches for
Direct/Reverse action
• One device for either Vac or Vdc po

Summary of the content on the page No. 2

ML6874 SPECIFICATIONS • ORDERING INFORMATION Specifications Accessories/Parts: IMPORTANT: 272630A--Auxiliary switch assembly (1-SPDT) The specifications given in this publication do not include 272630B--Auxiliary switch assembly (2-SPDT) normal manufacturing tolerances. Therefore, an individual 272775-- Replacement motor brush kit unit may not exactly match the listed specifications. Also, 40003793-003--Mounting hardware bag assembly this product is tested and calibrated under closel

Summary of the content on the page No. 3

ML6874 SPECIFICATIONS •INSTALLATION FIG. 1 -- DIMENSIONS OF ML6874 VALVE ACTUATOR IN MM (INCHES). Installation Mounting: 1. Ensure that the valve body is installed correctly, that is, the arrow points in the direction of the flow. 2. Although the actuator can be mounted in any position, it is preferable that the ML6874 is mounted above the valve body. This will minimize the risk of damage to the ML6874 in the event of condensation or a valve gland leak. 3. Remove the stem button (Fig

Summary of the content on the page No. 4

ML6874 INSTALLATION FIG.3 -- PREPARATION FOR VALVE ASSEMBLY. FIG. 4 -- ASSEMBLY OF ML6874A TO VALVE. 5. Remove the plastic cover from the ML6874 by loosening the two screws located on the top (Note: These screws are captive. Rotate three complete revolutions to remove cover ). Drop either Slot Headed or Allen Hex type of set screw (both are OR included in the plastic bag ) into the top of the shaft, slotted/ Allen Wrench Hexed side up. Or use the set screw from the valve stem button

Summary of the content on the page No. 5

ML6874 WIRING 3 SPDT Controller 2 ML6874 1 W T6 W L1 R 24 Vac L2 R B T5 B OR 2 ML6874 + T6 W T6 28 Vdc W T5 R R B T5 B ! Caution: In multiple actuators connection, power supply to all actuators must be connected in a TRUE parallel fashion to reduce excessive voltage drop. DO NOT "daisy chain" i.e. connected to one actutator then branched to another. Allow 0.5 amps maximum for each device. Actuators and controller can share same transformer providing the 1 VA

Summary of the content on the page No. 6

ML6874 OPERATION AND CHECKOUT Operation and checkout Operation: The recommended valve actuator power source is a class REPLACEMENT NOTE: 2, 24V transformer or 28Vdc across terminals T5 &T6. Internal circuitry provides dc power for the electronic 1. The old ML684 actuators cannot be used with new sensing and drive motor circuits. ML6874 valve actuators in the same circuitry, unless they are isolated by an isolation relay to prevent cross-talking. The motor is controlled by a micropr