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Operation
6 Operation
6.1 Adjusting the set point
6.1.1
Flow rate
Î Completely open the control and shut-off
valves or the bypass valve in the plant.
To adjust or change the flow rate set point,
proceed as follows:
Always adjust the set point based on a
closed restriction.
NOTICE
!
Risk of damage to the restriction stem
through one-side loading while turning the
set point screw clockwise.
First turn the handwheel of the electric actua-
tor to completely close the restriction.
1. To close the restriction (11), de-energize
the electric actuator (16).
2. Turn the manual adjuster (19) clockwise
() as far as it will go to close the re-
striction.
3. Use a suitable tool (Allen key, SW 4) to
turn the set point screw (13) clockwise
() as far as it will go.
4. Refer to Fig. 6 to find out how many
turns are required to set the flow rate.
5. Use a suitable tool (Allen key, SW 4) to
turn the set point screw (13) by the re-
quired number of turns. Turn it counter-
clockwise () to open the restriction. The
flow rate rises.
20
6. Guide the wire through the lead-seal
hole and lead-seal it to fix the adjusted
flow rate.
7. Reconnect the power supply to the elec-
tric actuator (16).
Tip
For exact adjustment, verify adjusted value
with a heat or flow meter.
Turns of the set point screw
5
K
vs
4
3
2
1
0
0.1
0.2
Fig. 6: Adjustment diagram for flow rate
1.6
2.5
V ˚
0.5
1
2
EB 3136 EN
m 3 /h
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