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Flow Rate setting (AHQM)
The flow rate is adjusted by means of
limitation of control valve stroke
There are two possibilities:
1. Adjustment with the flow adjusting
curves,
2. Adjustment with heat meter.
Pre-condition
(Min. diff. pressure over the valve)
To achieve maximum flow rate the pressure
difference Δp
across the control valve
v
must be at least:
Δp
= 0.5 bar
min
Adjustment with flow adjusting
13
curves
The system don't need to be active for
being adjusted.
1. Close control valve
by turning the
adjustable flow restrictor
(clockwise) to its stop.
Adjustable flow restrictor
moved by hand not by tool.
2. Select flow adjusting curve in the
diagram (see page 4).
Necessary
flow rate
No
Revolutions of
adjusting throttle
3. Open the adjustable flow restrictor
by determined number of revolutions to
the left
(counter clockwise):
Adjustable flow restrictor
moved by hand not by tool.
4. The setting of the valve stroke is
completed, continue with step 2 in
section Adjustment with Heat Meter.
Note:
The setting may be verified with help of a
heat meter if the system is in operation,
see next section.
73695230 DH-SMT/SI
Flow Adjusting Curves
Adjustment with Heat Meter
.
Pre-condition:
The setting can be carried out when the
electrical actuator AMV(E) is dismounted.
The system must be in operation. All units
in the system
completely open.
1. Observe heat meter indicator:
- turning to the left (counter
clockwise)
- turning to the right (clockwise)
decreases the flow rate
Adjustable flow restrictor
moved by hand not by tool.
to the right
After the adjustment has been completed
2. Install the electrical actuator
section Mounting of electrical actuator.
3. Shortly throttle the system and then
has to be
re-open it (e.g. by means of the
electrical actuator).
4. Verify flow rate.
The control valve setting is completed.
5. Electrical actuator
sealed
has to be
VI.LR.B1.02
14
15
or a bypass must be
increases the flow rate
has to be
, see
may now be
.
© Danfoss 11/2007
16
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