Flow Rate Adjustment - Danfoss Pilot-controlled PCVQ Instructions Manual

Instructions
7 Start-up
DH-SMT/SI
Pilot-controlled PCVQ DN 100 - DN 250 (PN 16, PN 25)

7.6 Flow Rate Adjustment

The setting of the setpoint for the flow rate
limitation is made by means of flow adjusting
curves (see section 7.7) or a heat meter (see
page 33).
Adjustment by means of flow adjusting
curves
Adjustment is to be made at a shut-down
system.
Procedure
1. Unscrew cover 1.
1
2. Loosen the counter nut 2.
2. Screw.in the adjusting throttle 3 to its stop.
3. Choose diagram,
(see section 7.7, Flow Adjusting Curves)
Observe effecitve pressure Δp
see rating plate on the actuator AVP-F
Required
flow rate
Read rotations
for the adjusting throttle
VI.JA.G2.02
© Danfoss 11/2006
4. Turn the adjusting throttle by this number of
rotations to the left.
5. The adjusted flow rate can be verified by
means of a flow rate measuring device.
Perhaps you need to re-adjust the flow rate.
Care for an adequate differential pressure in
the system.
6. Tighten the counter nut without changing the
position of the adjusting throttle.
2
7. Re-screw the cap nut 1.
8. The cap nut can be sealed.
3
: 0.2 or 0.5 bar
b
The flow rate adjustment is completed.
Now, adjust the differential pressure,
see section 7.8.
9