Danfoss AFP 2/VFG 22 Instrukcja obsługi - Strona 7

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AFP 2 / VFG 2 (21) DN 15-250, VFG 22 (221) 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 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

on valve body.

②

Flanges

in the pipeline must be in

③

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).

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

Order No.: 003G1391

AQ26905314366601-010203

or use the following pipes:

Stainless steel

Steel

Copper

•

Connection of impulse tubes

Installation in return flow

Installation in supply flow

Connection to the valve ❼

1. Remove plug

2. Screw in threaded joint G 1/4

Torque 40 Nm.

- or -

Connection to the Pipeline ❽①

No connection downwards/upwards

bring dirt/air into an impulse tube.

1. Cut pipe in rectangular sections

2. For copper pipe:

insert sockets

3. Verify the correct position of the cutting ring

4. Press impulse tube

up to its stop.

5. Tighten union nut

When installing seal pots

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

Dismounting ❿

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 following steps:

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

pressure is reached.

In case of higher test pressu res, remove impulse tubes

at the pipelines

Observe nominal pressure

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.

can be used:

DIN 17458,

Ø 10×0.8

DIN 2391

Ø 10×1

DIN 2391

Ø 10×1

DIN 1754

in the system

❻②

③

④

①

at the valve.

②

with copper seal,

②

, could

③

and deburr.

on both sides.

④

⑤

into the threaded joint

⑥

⑦

Torque 40 Nm.

❽⑧

, please

①

②

①

until the max testing

①

②

of the valve.

Filling the System, Start-up ⓬

The return flow pressure

exceed the supply flow pressure

Non-compliance may cause damages at

the controller

③

1. Open shut-off devices

④

available at the impulse tubes.

2. Slowly open valves in the system.

3. Slowly open shut-off devices

4. Slowly open shut-off devices

Putting out of Operation

1. Slowly close shut-off devices

2. Slowly close shut-off devices

Differential Pressure Setting ⓭

Set-point range see rating plate

1. Start-up of system, see section

2. Set flow rate on a motorized valve

which the differential pressure is controlled,

to about 50 %

②

3. Adjustment

• Observe pressure indica tors

• Turning to the right

⑤

(stressing the spring)

• Turning to the left

⑥

redu ces the

set-point (un-stressing the spring)

4. The set-point adjuster

⑦

5. Release the not yet used pointer

set position and fix it with the screw

Dimensions ⓮

Flanges: connection dimensi ons acc. to DIN 2501, seal form C

①

must not

②

that are possibly

in the supply flow.

⑤

⑥

in the return flow.

⑤

in the supply flow.

in the return flow.

⑥

①

⓬

over

③

④

increases the set-point

may be sealed.

, move it to the

⑧