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Operation
Î Adjustment with actuator · See Fig. 7-1
More details on the Type 3274 Electric Actu-
ator in u EB 8340; more details on the
Type 3374 Electric Actuator in u EB 8331-3
and u EB 8331-4.
1. Close the restriction. To do this, extend
the actuator stem (1.1) of the actuator (1)
as far as it will go by pressing the elec-
tric override button (or the manual mode
of the controller).
2. Remove the stem connector (1.2) and re-
tract the actuator stem to the top end po-
sition using the manual override.
3. Loosen the locking screw (2.6) and turn
the set point adjuster (2.3) clockwise ()
until the scale reading 0 is located above
the red groove mark (2.5).
4. Thread the lock nut (2.2) downward
against the set point adjuster (2.3) while
making sure the rod is not turned by
holding the threaded rod (2.1) stationary
at the flattened part using a wrench.
5. Determine the turns required to achieve
the desired flow rate from the adjustment
diagrams (see Table 7-3).
6. Turn the hex nut on the set point adjuster
(2.3) until the previously determined
scale reading is located above the red
groove mark (2.5) on the reference ring.
7. Check the flow rate at the heat meter and
correct it, if necessary.
8. Once the flow rate is set as required,
lock the setting with the locking screw
(2.6).
7-6
9. Extend the actuator stem (1.1) as far as it
will go using the manual override.
10. Position the stem connector clamps (1.2)
and screw them tight.
11. Slightly retract the actuator stem to allow
the lock nut (2.2) to move. Thread the
lock nut upwards toward the stem con-
nector to lock the setting.
EB 3018 EN
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