Viega Basic Heating Control Installation Manual page 26

Product
Instructions
Operation
The movement of the electric actuator is produced by
the rotation of a screw spindle which is driven in both
directions by a synchronous motor through a set of
gears. A magnetic coupling limits the torque of the
gear assembly and the driving force of the actuator.
The actuator is fixed to the valve body by means of
a coupling ring requiring no tools for mounting. The
actuator is maintenance free and supplied complete
with a ready-to-wire connecting cable.
Mounting
For ease of installation, make sure that the actuator is
in the open position (factory supplied) before fixing the
actuator to the valve body. Thread the nut hand tight
only (do not use pliers or a wrench).
Troubleshooting
A functional check of the valve actuator can be made
by suddenly changing the heating curve adjustment.
The movement of the actuator stem indicates whether
the valve is opening or closing.
If the direction of travel is incorrect, the green and
brown wires should be exchanged.
301 N. Main, 9th Floor • Wichita, KS 67202 • Ph: 800-976-9819 • Fax: 316-425-7618 • www.viega.com
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PI-PR-561170 0512 (3 Position Actuator for Stations)
EN0B-0471GE51-VIEGA R0412B
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Dimensions
Wiring Diagram
Green wire: open valve (warmer water)
Brown wire: close valve (cooler water)
White wire: ground
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