Danfoss AFA 2 / VFG 21 Manuel - Page 7

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AFA 2 / VFG 2(1) DN 15-250, VFG 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 controller is used for pressure relief 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

*) adapter 003G1780, accessory sold separately,

**) Impulse tube AF, accessory sold separately

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

The valve is closed without pressure

and is opening on rising pressure ①

before the valve.

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

(stressed).

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).

AQ36277258032801-010102

3. Release spring (unstress) and release the

uninon nut by pulling out the blocking

spring.

4. Tight the union nut by hand or with wrench

key using minimal force

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:

Steel /

Ø 10×1

Stainless steel

Copper

Ø 10×1

•

The impulse tube ③ can be connected

directly to the valve ④

to the pipeline ⑤.

⑥ ventilation socket, do not connect

impulse tube.

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

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

Observe max.

permitted pressure, see below.

The pressure behind the valve ② must not

exceed the pressure before the valve ①.

Observe nominal pressure ⑤ of the valve.

Caution:

The valve is closed without pressure and it

opens on rising pressure before the valve.

ISO 1127 D3/T3

Prior to pressure tests, it is absolutely necessary

Cu-DHP R200

to remove the impulse tube at the valve ④.

EN12449

Close connections with plugs G ¼ ISO 228.

Max. pressure [bar] with connected impulse tube:

AFA 2 cm

bar

Max. test pressure with disconnected impulse

tube must not exceed the plant testing pressure

and must always be lower than 1.5 × PN.

Non-compliance may cause damages at the

controller ③.

Filling the System, Start-up

The pressure ② behind the valve

must not exceed the pressure ① before

the valve.

Non-compliance may cause damages at the

controller ③.

1. Open shut-off devices that are possibly

available at the impulse tubes ④.

2. Slowly open valves in the system.

3. Slowly open shut-off device ⑤.

4. Slowly open shut-off device ⑥.

Putting out of Operation

1. Slowly close shut-off device ⑤.

2. Slowly close shut-off device ⑥.

Setpoint Adjustment

1. Set-point range see rating plate ①

2. Start-up of system, see section ⓬.

3. Start pump ②

4. Observe pressure indicator ③

5. Slightly close fitting ④ behind the pump (in

flow direction) so that the pressure ③ is rising.

6. Adjustment of the pressure in front of the valve

• Turning to the right ⑥ reduces the set-point

(unstressing the spring - tension spring)

• Turning to the left ⑦ increases the set-point

(stressing the spring)

7. If the required pressure ③ cannot be set,

further close the fitting ④.

8. The set-point adjuster ⑧ may be sealed.

9. Release the not yet used pointer ⑨, move it

to the set position and fix it with the screw to

mark setting position

Dimensions

Flanges: connection dimensi ons acc. to

DIN 2501, seal form C

⓫

160

320

640

2.5

1.3

0.35

⓬

⓭

⓮