Danfoss AFP/VFG 21 Manual Del Usuario página 6

AFP/VFG 2(1) DN 15-250
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.
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
DN 15‑80 ①:
media temperatures up to 120 °C:
Can be installed in any positi on.
DN 100‑250 and DN 15‑80 ②:
media temperatures > 120 °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.
Valve Actuator Installation ❺
Valves DN 150‑250 ①
The actuator stem must be screwed
into the valve stem.
Observe the Installation Instructions ② for the
DN 150 - 250 valves.
1. Place the actuator stem to the valve stem
and screw gently by hand until it stops ③.
2. Unscrew for approximately one turn.
6 | © Danfoss | 2021.05
Valves DN 15‑125
1. Screw the actuator nut to the valve neck.
2. Align actuator, observe position of impulse
tubes connection to the valve ⑤
3. Tighten union nut ④ Torque 100 Nm
Impulse Tube mounting ❻
When installing seal pots ❻①, please
observe the Installati on Instructions
for the seal pots.
• Which impulse tubes to use?
The impulse tube set AF (2×) ❻② 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 ❻③ in the
system
Installation in return flow ④
Installation in supply flow ⑤
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 ❽④
No connection downwards/upwards ⑤, could
bring dirt/air into an impulse tube.
1. Cut pipe in rectangular sections ⑥ and
deburr.
2. For copper pipe:
insert sockets ⑦ on both sides.
3. Verify the correct position of the cutting ring
⑧.
4. Press impulse tube ⑨ into the threaded joint
up to its stop.
5. Tighten union nut ⑩ Torque 40 Nm.
Insulation
❾
For media temperatures up to 100 °C the
pressure actua tor ① may be insulated.
Dismounting
❿
Danger
Danger of injury by hot water
Valve without actuator is open ①, Seal ② is in
the ac tuator.
Prior to dismounting depres surize system!
Carry out dismounting in re verse order to
mounting.
Leak and Pressure Test
Pressure must be constantly increased
at the +/- connec tion ①. Never
increase − pressure above + pressure.
Observe max. permitted pressure, see below.
Non-compliance may cause damages at the
actuator or valve.
Max. test pressure [bar] with connected
impulse tu bes
AFP cm
2
bar
In case of higher test pressu res, remove impulse
tubes at the pipelines ①.
DIN 17458,
DIN 2391
Close connections with plugs G ¼ ISO 228.
DIN 2391
Observe nominal pressure ② of the valve.
DIN 1754
Max. test pres sure is 1,5 × PN
Filling the System, Start‑up
The return flow pressure ① must not
exceed the supply flow pressure ②.
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 by
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 (unstressing the spring)
4. The set-point adjuster ⑦ may be sealed.
Dimensions
⓮
Flanges: connection dimensi ons acc. to DIN 2501,
seal form C
⓫
80 250 630
25 25 16
⓬
⓭
AQ17328645996904-010302