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AFP 2 / VFG 22 (221) DN15-250
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.
Disposal instructions
This product should be dismantled
and its components sorted, if possible,
in various groups before recycling or
disposal.
Always follow the local disposal regulations.
Definition of Application
The controller is used for diffe rential pressure
control of water and water glycol mixtures for
heating, district heating and cooling systems.
The technical data on the label plates determine
the use.
Scope of Delivery
❶
*) Impulse tube AF, accessory
Assembly
Admissible Installation Positions ❷
① media temperatures up to 150 °C:
Can be installed in any positi on.
② media temperatures > 150 °C.
Installation permitted only in horizontal
pipelines with the actuator oriented
downwards.
Installation Location and Installation
Scheme ❸
Return mounting ①
Flow mounting ②
Valve Installation ❹
1. Install strainer ① before the controller.
2. Rinse system prior to installing the valve.
3. Observe flow direction ② on valve body.
Flanges ③ in the pipeline must be in
parallel position and sealing surfaces
must be clean and without any
damage.
4. Install valve.
5. Tighten screws crosswise in 3 steps up to the
max. torque.
VI.LI.H1.02
Actuator Installation
❺
The actuator stem must be screwed
into the valve stem.
1. Remove the spindle protection cup
2. Align the actuator stem with the valve stem,
connect both stems and turn gently the whole
pressure actuator clockwise with both hands,
until the stems are fully connected (valve stem
fully screwed into the actuator stem).
3. Release the uninon nut by pulling out the
blocking spring.
4. Tight the union nut
5. Release the pressure actuator by turning it
counter clockwise for approximately half a
turn.
6. Observe the position of impulse tubes
connection to the valve and align the
actuator accordingly.
7. Hold the actuator in the position and tight
the union nut to the valve with 100- 120 Nm
torque.
Impulse Tube mounting
❻
•
Which impulse tubes to use?
The impulse tube set AF (2×) ❻① can be
used: Order No.: 003G1391
or use the following pipes:
Stainless steel
Ø 10×0.8
Steel
Ø 10×1
Copper
Ø 10×1
•
Connection of impulse tubes ❻② in the
system
Installation in return flow ③
Installation in supply flow ④
Connection to the valve ❼
1. Remove plug ① at the valve.
2. Screw in threaded joint G 1/4 ② with copper
seal, Torque 40 Nm.
- or -
Connection to the Pipeline ❽①
No connection downwards/upwards ②, could
bring dirt/air into an impulse tube.
1. Cut pipe in rectangular sections ③ and
deburr.
2. For copper pipe:
insert sockets ④ on both sides.
3. Verify the correct position of the cutting
ring ⑤.
4. Press impulse tube ⑥ into the threaded joint
up to its stop.
5. Tighten union nut ⑦ Torque 40 Nm.
When installing seal pots ❽⑧, please
observe the Installati on Instructions
for the seal pots.
Insulation
❾
For media temperatures up to 120 °C the
pressure actua tor may be insulated ①.
Dismounting
Danger
Danger of injury by hot water
Prior to dismounting depres surize system or
use shut off valves on the impulse tubes!
Carry out dismounting in re verse order to
mounting.
Leak and Pressure Test
To prevent damages on the
diaphragm pressure must be
constantly and simultaneously
increased at the + and − connection ①
until the max testing pressure is
reached.
In case of higher test pressu res, remove impulse
tubes at the pipelines ①.
Observe nominal pressure ② of the valve.
Max. test pres sure must not exceed the plant
testing pressure and must always be lower than
1.5 × PN
Non-compliance may cause damages at the
actuator or valve.
Filling the System, Start-up
DIN 17458,
DIN 2391
The return flow pressure ① must not
DIN 2391
exceed the supply flow pressure ②.
DIN 1754
Non-compliance may cause damages at the
controller ③.
1. Open shut-off devices ④ that are possibly
available at the impulse tubes.
2. Slowly open valves in the system.
3. Slowly open shut-off devices ⑤ in the supply
flow.
4. Slowly open shut-off devices ⑥ in the return
flow.
Putting out of Operation
1. Slowly close shut-off devices ⑤ in the supply
flow.
2. Slowly close shut-off devices ⑥ in the return
flow.
Differential Pressure Setting
Set-point range see rating plate ①
1. Start-up of system, see section ⓬.
2. Set flow rate on a motorized valve ③ over
which the differential pressure is controlled,
to about 50 % ②
3. Adjustment
• Observe pressure indica tors ④.
• Turning to the right ⑤ increases the set-
point (stressing the spring)
• Turning to the left ⑥ redu ces the
set-point (un-stressing the spring)
4. The set-point adjuster ⑦ may be sealed.
5. Release the not yet used pointer ⑧, move it
to the set position and fix it with the screw
Dimensions
⓮
Flanges: connection dimensi ons acc. to DIN 2501, seal form C
❿
⓫
⓬
⓭
© Danfoss | 2018.01 | 7
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