8
VI.DB.T3.3F
© Danfoss 02/2011
73695050 DH-SMT/SI
Settings
Flow Rate Setting
⓫
The flow rate is adjusted by means of
limitation of control valve stroke
①②
.
There are two possibilities:
1. Adjustment with the flow adjusting
curves,
2. Adjustment with heat meter.
Pre-condition
⓬
(min. diff. pressure over the valve)
To achieve maximum flow rate the pressure
difference Δp
v
①
across the control valve
must be at least: Δp
min
= 0.5 bar
Adjustment with flow adjusting
curves
⓭
The system don’t need to be active for
being adjusted.
1. Close control valve
①
by turning the
adjustable flow restrictor
③④
to its
stop:
- at PN 16 controller to the right
(clockwise)
⑤
- at PN 25 controller to the right
(clockwise)
⑥
or to the left (counter
clockwise)
⑦
2. Select flow adjusting curve in the
diagram (see
⓯⓰
).
No
Necessary
flow rate
Revolutions of
adjusting throttle
For PN 16 controller: 1 = 120°
For PN 25 controller: 1 = 360°
3. Open control valve
②
with the
adjustable flow restrictor
⑧⑨
by
determined number of revolutions:
• at PN 16 controller to the left (counter
clockwise)
⑩
• at PN 25 controller to the left (counter
clockwise)
⑪
or to the right
(clockwise)
⑫
4. The setting of the valve stroke is
completed, continue with step 2,
Adjustment with Heat Meter.
The setting may be verified with help of a
heat meter if the system is in operation,
see next section.
Flow Adjusting Curves PN 16
⓯
Flow Adjusting Curves PN 25
⓰
Adjustment with Heat Meter
Pre-condition:
The setting should be carried out when the
electrical actuator AMV(E) is dismounted. If
the electrical actuator is mounted, the stem
of the actuator must be retracted.
The system must be in operation. All units
in the system
❿
or a bypass must be
completely open.
1. Observe heat meter indicator.
⓭
At PN 16 controller:
- turning to the left (counter clockwise)
②
increases the flow rate
- turning to the right (clockwise)
⑤
decreases the flow rate
At PN 25 controller:
- turning to the left (counter
clockwise)
⑪
or to the right
(clockwise)
⑫
increases the flow rate
- turning to the right (clockwise)
⑥
or to the left (counter clockwise)
⑦
decreases the flow rate.
After the adjustment has been completed
⓮
:
2. If not yet done, install the actuator
①
,
see section Mounting of electrical
actuator.
3. Shortly throttle the system and then
reopen it (e.g. by means of the electrical
actuator).
4. Verify flow rate.
The control valve setting is completed.
5. The adjustable flow restrictor
②③
may
be sealed.
Temperature setting
(relevant only at AVQMT controllers)
See instructions for temperature actuator
AVT or safety temperature monitor
(actuator) STM.