Instruction/ maintenance manual of the product VA-8051 Johnson Controls
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Valve and Actuator Manual 977 Actuators and Positioners Section Product Bulletin VA-8051 Issue Date 0988 © 1988 Johnson Controls, Inc. 1 Part No.14-548-9 Rev. A Code No. LIT- 977305 VA-8051 Electric Valve Actuator Floating Control, 50 lb. Force The VA-8051 synchronous, motor-driven actuator provides floating control of valves with up to 3/4 in.
2 VA-8051 Product Bulletin Wiring All wiring must be in accordance with applicable electrical code requirements. Input lines to the actuator must be wired correctly for the valve to move in the proper direction.
VA-8051 Product Bulletin 3 Wiring is to a terminal strip labeled DWN (Down), COM (Common) and UP, respectively. Wiring is to the terminals labeled R (Retracted end), W (Wiper), and S (Stroked end) for the feedback potentiometer. (See Fig. 6). Retrofit Installation ! CAUTION: Do not use on valves having a stroke over 3/4 in.
4 VA-8051 Product Bulletin 8. Reverse the actuator and drive it up until it stops on the limit switch. Check to make sure the gap between the lever plate and the molded upper stop is 1/16 in. (.047 to .093 in.). Set with flat washer gage supplied. (See Fig.
VA-8051 Product Bulletin 5 Repair Information Field repairs must not be made. For a replacement VA-8051, contact the nearest Johnson Controls branch office. Application and Drawing Identification Fig. 3: Isometric Drawing Fig. 4: VA-8051-1 Dimensions in.
6 VA-8051 Product Bulletin Fig. 6: DSC-8500 Application Wiring (Incremental Control with Position Indication or Proportional Control) Controls Group 507 E.
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