Danfoss AFQ 2 Instructions page 8

AFQ 2 / VFQ 2(1) DN 15-125, VFQ 22(1) DN 65-250
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 flow rate controller is used for flow rate
restriction of water and water-glycol mixtures in
heating, district heating and cooling systems.
The technical data on the label plates determine
the use.
Scope of Delivery
❶
accessory sold separately,
1)
Impulse tube set - accessory sold separately
2)
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
Flow mounting
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.
Actuator Installation
❺
The actuator stem must be screwed
into the valve stem. Spring on the
pressure actuator is factory adjusted
(released) for proper installation.
1. Remove the spindle protection cup and
release the valve spindle by removing the
nut, washer and cardboard tube.
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).
AQ37768222503601-000101
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
Connection of impulse tubes in the system -
Overview
1. Installation in return flow ②.
2. Installation in supply flow ③.
Connection of impulse tube set ❼
Remove plug ① at the valve.
Screw in threaded joint ② with copper
seal. Torque: 40 Nm
For instalation of impulse tube sets,
please observe the Installation
Instructions for the Impulse tube sets.
Connection of impulse tube set AF
If control lines (copper) are not pre-bent or seal
pots are to be installed, please observe the
Assembly Instructions of these parts.
• Which impulse tubes to use?
The impulse tube set AF (2×) ❻ ① can be used:
Order No.: 003G1391 or use the following pipes:
Stainless steel Ø 10×0.8 DIN 17458, DIN 2391
Steel Ø 10×1 DIN 2391
Copper Ø 10×1 DIN 1754
Connection of impulse tube set ❽①
1. Cut pipe in rectangular sections ① and
deburr.
2. For copper pipe:
insert sockets ② on both sides.
3. Verify the correct position of the cutting
ring ③.
4. Press impulse tube ④ into the threaded joint
up to its stop.
5. Tighten union nut ⑤ Torque 40 Nm.
When installing seal pots ❽⑥, 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
❿
Danger
Danger of injury by hot water
Prior to dismounting depres surize system or
use shut off valves on the impulse tubes! ①
Carry out dismounting in following steps: ②
1. Fasten pressure actuator with the safety
bands to the fixed points in surroundings
2. Before releasing the actuator, fully release
the union nut
3. Hold the pressure actuator with both
hands, and release it by turning it counter
clockwise ~30 turns. During turning, control
the actuator weight all the time to prevent
unexpected fall of detached actuator.
4. Carefully remove the actuator from the valve.
Before installing actuator back to the valve,
setting spring must be fully released again.
Leak and Pressure Test
⓫
"Danger of injury by heavy weight of
pressure actuator. When dismounting
the pressure actuator from the valve,
control the actuator weight all the time to
prevent unexpected fall of detached actuator
and potential injuries due to the heavy weight!"
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 ① and close the valve with appropriate
plugs.
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
The return flow pressure ① must not
exceed the supply flow pressure ②.
Non-compliance may cause damages at the
controller ③.
1. Slowly open valves in the system.
2. Slowly open shut-off devices ④ in the supply
flow.
3. Slowly open shut-off devices ⑤ in the return
flow.
Putting out of Operation
1. Slowly close shut-off devices ④ in the supply
flow.
2. Slowly close shut-off devices ⑤ in the return
flow.
Adjustment of Flow Rate Limitation
The flow rate is limited by adjusting the stroke of
the adjusting throttle ⓭①.
There are two options:
1. Adjustment with the flow adjusting curves
2. Adjustment with heat meter.
Adjustment with flow adjusting curves
The system must not be running!
When closing the adjusting throttle
(step 3), the actuator could be damaged
in case of high pressure differences.
1. Screw in adjusting throttle ⓭② up to its
stop.
→ Valve is closed, no flow.
© Danfoss | 2021.09 | 8
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