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AVP, AVP-F – PN 16,25/DN 15 – 50
ENGLISH
Safety Notes
Prior to assembly and commissioning to avoid
injury of persons and damages of the devices, it is
absolutely necessary to carefully read and observe
these instructions.
Necessary assembly, start-up, and maintenance
work must be performed only by qualified, trained
and authorized personnel.
Prior to assembly and maintenance work on the
controller, the system must be:
- depressurized,
- cooled down,
- emptied and
- cleaned.
Please comply with the instructions of the system
manufacturer or system operator.
Definition of Application
The controller is used for pressure relief control
of water and water glycol mixtures for heating,
district heating and cooling systems.
The technical parameters on the product labels
determine the use.
Assembly
Admissible Installation Positions ❶
Medium temperatures up to 100 °C ①:
- Can by installed in any position.
Medium temperatures > 100 °C ②:
- Installation permitted only in horizontal
pipelines with the actuator oriented
downwards.
Installation Location and Installation
Scheme ❷
AVP (-F) return mounting ①
AVP (-F) flow mounting ②
Valve Installation ❸
1. Clean pipeline system prior to assembly.
2. The installation of a strainer in front of the
controller is strongly recommended ①.
3. Install pressure indicators in front of and
behind the system part to be controlled.
4. Install valve
• The flow direction indicated on the
product label ② or on the valve ③ must
be observed.
• The valve with mounted weld-on
tailpieces may only be spotwelded to the
pipeline ④.
The weld-on tailpieces may be welded only
without the valve and seals! ⑤⑥
If these instructions are not observed, high
welding temperatures may destroy the
seals.
• Flanges ⑦ in the pipeline must be in
parallel position and sealing surfaces must
be clean and without any damage.
Tighten screws in flanges crosswise in 3
steps up to the maximum torque (50 Nm).
5. Caution:
Mechanical loads of the valve body by the
pipelines are not permitted ⑧.
© Danfoss | Climate Solutions | 2025.01
Impulse tube and seal pot mounting
•
Which impulse tubes to use? ❹
Use Impulse tube set AV ① or
use following pipe:
Copper Ø 6 × 1 mm EN 12449
•
Connection of impulse tube and seal pot ③
in the system ❺
- Return mounting ①
- Flow mounting ②
•
Connection to the pipeline ❻
It is strongly recommended to install the
impulse tube to the pipeline horizontally ①
or upwards ②.
This prevents dirt accumulation in the
impulse tube and possible malfunction of
the controller.
Connection downwards is not
recommendable ③.
•
Impulse Tube Mounting ❼
1. Cut pipe perpendicularly to the pipe axis
and smooth edges out ①.
2. Press impulse tube ② into the threaded
joint up to its stop.
3. Tighten union nut ③ Torque 14 Nm
Insulation ❽
For medium temperatures up to 100 °C the pressure
actuator ① may also be insulated.
Start-up ❾
Filling the system, first start-up
1. Slowly open shut-off devices ① in the flow
pipeline.
2. Slowly open shut-off devices ② in the return
pipeline.
3. Slowly open shut-off devices ③ in the flow
pipeline.
4. Slowly open shut-off devices ④ in the return
pipeline.
Leak and Pressure Tests
Pressure must be gradually increased
at the +/- connection ⑤.
Non-compliance may cause damages at the
actuator or the valve.
A pressure test of the entire system must be carried
out in accordance with manufacturer's instructions.
The maximum test pressure is: 1,5 × PN
PN - see product label!
Putting out of operation
1. Slowly close shut-off devices ③ in the flow
pipeline.
2. Slowly close shut-off devices ④ in the return
pipeline.
Settings
Differential Pressure Setting ❿
(not relevant at fixed setting version AVP-F)
The pressure setting range is indicated on the
product label ①.
Procedure:
1. Start system, see section "Filling the system,
first start-up"
Completely open all shut-off devices in the
system.
2. Set flow rate on a motorised valve ②, on
which differential pressure is controlled, to
about 50 %.
3. Adjustment
Observe pressure indicators ③ or/and
alternatively see handle scale indication.
Turning to the right (clockwise) ④ increases
the set-point (stressing the spring).
Turning to the left (counter clockwise) ⑤
reduces the set-point (releasing the spring).
If the required differential pressure is
not attained, a cause may be a too
small pressure loss in the system.
Seal ⓫
The set-point adjuster can be sealed by a seal
wire ①, if necessary.
Dimensions, Weights ⓬
(See page 2)
Conical ext. thread acc. to EN 10226-1
1)
2)
Flanges PN 25, acc. to EN 1092-2
Other flange dimensions - see table
for tailpieces.
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