Danfoss PN 16 Self Acting Flow Control
Flow Control Instructions
AVQM is a self-acting flow control with required max. flow setting facilities.
AMV gear motor is mounted onto AVQM and controlled by e.g. weather compensator, type ECL.
Fitting
AVQM can be fitted in any position in heating-system flow or return with flow in cast-in arrow-direction. A strainer must be fitted in flow line, e.g. Danfoss strainer type FV (1 and 2 – AVQM fitted in return).
Starting
Gradually open flow line shut-off cock before opening return line shut-off cock
Pressure testing
Max. test pressure: PN 16 = 25 bar, PN 25 = 40 bar.
Flow adjustment
All district heating connections and bypass, if any, must be open to achieve max. flow. Flow is adjusted either with or without motor mounted onto AVQM.
Without motor
Setting diagrams (see 3, ∆ pb = 0.2 bar and 3a, ∆ pb = 0.5 bar) show required flow depending on scale setting 1 to 10 (14) from closed position (see 4a). Use the tool delivered with the AVQM (see4b) for turning adjustment screw clockwise until it cannot be turned any further (min. flow). Flow can be roughly adjusted in turning adjustment screw counter-clockwise.
With motor
Turn adjustment screw to max. setting (see 4b) and the valve will be opened electrically or manually to ensure required flow, then set adjustment screw on required flow. Without flowmeter it might be necessary to readjust flow with adjustment screw and motor.
Use enclosed plate for covering flow setting. Cover plate is pushed across setting windows (see 4c) and sealed (see 4d)
Fault location
If the control does not function as required, check whether valve body is correctly fitted and whether the impulse tube is blocked.
Dimension
| DN | L |
| 15 | 65 mm |
| 20 | 70 mm |
| 25 | 75 mm |
| 30 | 100 mm |
| DN | L1 |
| 15 | 131 mm |
| 20 | 142 mm |
| 25 | 159 mm |
| 32 | 196 mm |
| DN | L2 |
| 15 | 139 mm |
| 20 | 154 mm |
| 25 | 159 mm |
| 32 | 184 mm |
| DN | L3 |
| 15 | 69 mm |
| 20 | 74 mm |
| 25 | 79 mm |
| 32 | 104 mm |
Service
There must be no pressure on the system when dismantling the control.
Therefore the control must be disconnected.
Spare parts
| Description | Code No. |
| Diaphragm section for AVQM | 003H2305 |
| Valve insert, kvs = 1.6 m3 /h | 003H2310 |
| Valve insert, kvs = 2.5 m3 /h | 003H2311 |
| Valve insert, kvs = 4.0 m3 /h | 003H2312 |
| Valve insert, kvs = 6.3 m3 /h | 003H2313 |
| Valve insert, kvs = 10.0 m3 /h | 003H2314 |
| Contr. valve kvs = 1.6 m3 /h | 003H2336 |
| Contr. valve kvs = 2.5 m3 /h | 003H2337 |
| Control valve kvs = 4.0 m3 /h | 003H2338 |
| Control valve kvs = 6.3 m3 /h | 003H2339 |
| Control valve kvs = 10.0 m3 /h | 003H2340 |
Documents / Resources
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Danfoss PN 16 Self Acting Flow Control [pdf] Instructions 003R9105, 003H2305, 003H2310, 003H2311, 003H2312, 003H2313, 003H2314, 003H2336, 003H2337, 003H2338, 003H2339, 003H2340, PN 16 Self Acting Flow Control, PN 16, Self Acting Flow Control, Acting Flow Control, Flow Control |