Danfoss VFG 2 Series Kurulum Kılavuzu - Sayfa 6

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Installation Guide

LANGUAGE

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.

Disposal instructions

This product should be

dismantled and its components

sorted, if possible, in various

groups before recycling or

disposal.

Always follow the local disposal regulations.

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 ra ting plates

determine the use.

Scope of Delivery ❶

*) Impulse tube AF, accessory

Assembly

Admissible Installation Positions ❷

DN 15-80 ①:

medium temperatures up to 120 °C:

Can be installed in any positi on.

DN 100-250 and DN 15-80 ②:

medium 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.

DEN-SMT/SI

AFP/VFG 2(21) DN 15-250

Valve Actuator Installation

Valves DN 150-250

The actuator stem must be screwed into

the valve stem.

Observe the Installation In structions for the

valves DN 150-250.

Valves DN 15-125 ❺

1. Place actuator at the valve.

2. Align actuator, observe position of impulse

tube connection to the valve ①

3. Tighten union nut ② Torque 100 Nm

Impulse Tube mounting

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 ❼ of impulse tubes ① in the

system

Installation in return flow ②

Installation in supply flow ③

• Connection ❽ to the pipeline ①

No connection downwards ②, could be

chocked by dirt.

• Impulse Tube Installation (Copper) ❾

1. Cut pipe into rectangular sections ① and

deburr.

2. Insert sleeves 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

Insulation ❿

For medium temperatures up to 100 °C the

pressure actua tor may be insulated ①.

Dimensions ⓫

Flanges:

connection dimensi ons acc. to

DIN 2501, seal form C

Dismounting ⓬

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.

VI.CA.K2.1I

Leak and Pressure Test ⓭

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

bar

In case of higher test pressu res, remove impulse

tubes at the pipelines ①.

Close connections with plugs G ¼ ISO 228.

Observe nominal pressure ② of the valve.

Max. test pres sure is 1,5 × PN

Filling the System, Start-up ⓮

The return flow pressure ① must not

exceed the supply flow pressure ②.

DIN 17458,

Non-compliance may cause damages at the

DIN 2391

controller ③.

DIN 2391

1. Open shut-off devices ④ that are possibly

DIN 1754

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 ⓯

Set-point range see rating plate ①

1. Start-up of system, see section ⓮.

2. Set flow rate on a motorised valve ③ by

which the differential pressure is controlled,

to about 50 % ②

3. Adjustment

• Observe pressure indica t ors 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.

250

630

District Energy