Инструкция по эксплуатации Danfoss VFG 2 — страница 6

Installation Guide

AFP/VFG 2(21) DN 15-250

DEN-SMT/SI

VI.CA.K2.1I

District Energy

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.

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

Ш 10Ч0,8

DIN 17458,

DIN 2391

Steel

Ш 10Ч1

DIN 2391

Copper

Ш 10Ч1

DIN 1754

• 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.

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

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.

Non-compliance may cause damages at the controller ③.

1 Open shut-off devices ④ that are possibly 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 tors ④.

• Turning to the right ⑤ increases the setpoint (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.