Samson 3374 - Page 52

7-6 EB 3018 EN
Operation
9. Thread the lock nut (2.2) upwards to the
head of the rod (2.1).
10. Extend the actuator stem (1.1) using the
manual override. Place the actuator on
the yoke and screw tight (see 'Tightening
torques' in Annex).
11. Position the stem connector (1.2) and fas-
ten with screws.
12. Thread the lock nut (2.2) all the way to
the top toward the stem connector (1.2)
and lock in place (see 'Tightening
torques' in Annex).
Î Adjustment with actuator · See Fig.7-1
More details on the Type3374 Electric Actu-
ator 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). Make
sure that the rod does not get turned by
holding the threaded rod (2.1) stationary
at the attened part using a wrench.
5. Determine the scale divisions required to
achieve the desired ow 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 ow rate at the heat meter and
correct it, if necessary.
8. Once the ow rate is set as required,
lock the setting with the locking screw
(2.6).
9. Extend the actuator stem (1.1) as far as it
will go using the manual override.
10. Position the stem connector (1.2) and fas-
ten with screws.
11. Slightly retract the actuator stem to allow
the lock nut (2.2) to move.
12. Thread the lock nut (2.2) all the way to
the top toward the stem connector (1.2)
and lock in place (see 'Tightening
torques' in Annex).