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AFA/VFG 2(1)
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 of
steam, 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, for connection to
the pipeline.
Mounting
❷
Admissible Installation Positions
DN 15‑80 media temperatures up to 120 °C:
Can be installed in any position ①.
DN 100‑250 and DN 15‑80, media
temperatures higher >120 °C.
Installation only permitted in horizontal
pipelines with the actuator hanging
downwards ②.
Installation Scheme
❸
Note: The valve is closed without pressure
and is opening on rising pressure ② before
the valve.
Valve Installation
❹
1. Install strainer ❸ ① before the controller.
2. Rinse system prior to installing the valve.
3. Observe flow direction ③ on the valve body.
Flanges ④ in the pipeline must be in
parallel position and sealing surfaces
must be clean and without any
damage.
4. Install the valve.
5. Tighten screws crosswise in 3 steps up to the
max. torque.
Valve Actuator Installation
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.
6 | © Danfoss | 2021.05
Valves DN 15‑125:
1. Place actuator at the valve.
2. Align actuator, observe position of impulse
tube connection ③.
2. Tighten union nut ④
Torque 100 Nm
Impulse Tube Installation
Note: When installing seal pots ①, please
observe the Installation Instructions for the
seal pots.
Which impulse tubes to use?
Use the impulse tube set AF (1×) ②:
Order No.: 003G1391
or use the following pipes:
Stainless steel
Steel
Copper
The impulse tube ③ can be connected directly
to the valve ④ or to the pipeline ⑤.
⑥ ventilation socket, do not connect
impulse tube.
Installation ❼
1. Remove plug ① at the valve.
2. Screwed in threaded joint G ¼ ② with
copper seal,
Torque 40 Nm.
3. Cut pipe in rectangular sections ③ and burr.
4. For copper pipe: insert sockets ④ on both
sides.
5. Verify the correct position of the cutting
ring ⑤.
6. Press impulse tube ⑥ into the threaded joint
up to its stop.
7. Tighten union nut ⑦
Torque 40 Nm
Insulation
For media temperatures up to 100 °C the
pressure actua tor ① may be insulated.
Dismounting
Danger
Danger of injury by hot water!
Valve without actuator is open ①, seal ② is in
the actuator.
Prior to dismounting, depressurize system!
Carry out dismounting in reverse order to
mounting.
Leak and Pressure Tests
Observe max. permitted pressure, see
❺
below.
The pressure ① behind the valve must not
exceed the pressure ② before the valve.
❻
DIN 17458
Ø 10×0.8
DIN 2391
Ø 10×1
DIN 2391
Ø 10×1
DIN 1754
❽
❾
❿
Caution:
The valve is closed without pressure and is
opening on rising pressure before the valve.
Non-compliance may cause damages at the
controller ③.
Prior to pressure tests, it is absolutely
necessary to remove the impulse tube at the
valve ④.
Close connections with plugs G ¼ ISO 228.
Max. pressure [bar] with connected impulse
tube
AFA cm
32
80
2
bar
16
6
Observe nominal pressure ⑤ of the valve.
Max. test pressure is 1.5 × PN.
Filling the System, First Start‑up
The pressure ① behind the valve
must not exceed the pressure ②
before the valve.
Caution:
The valve is closed without pressure and is
opening on rising pressure before the valve.
Non-compliance may cause
damages at the controller ③ .
1. Open shut-off valve ④ at the impulse tube, if
any.
2. Slowly open shut-off unit ⑥.
3. Slowly open shut-off unit ⑤.
4. Only for actuator 630 cm²:
Open ventilation screw ⑦ by about 2 turns.
As soon as water is penetrating, close screw.
Putting out of Operation
⓬
1. Slowly close shut-off units ①.
2. Slowly close shut-off units ②.
Setpoint Adjustment
⓭
Set-point range see rating plate ①.
1. Start system, see section "First Start-up".
2. Start pump ②.
3. Observe pressure indicator ③.
4. Slightly close fitting ④ behind the pump
(in flow direction) so that the pressure ③ is
rising.
5. Adjusting the setpoint ⓮:
Turning to the right ① reduces the set-point
(unstressing the spring, tension spring)
Turning to the left ② increases the set-point
(stressing the spring)
6. If the required pressure ③ cannot be set,
further close the fitting ④.
7. The set-point adjuster ⑤ may be sealed.
Dimensions, Weights
⓯
AQ13838645618604-010203
250
630
1.5
0.5
⓫
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