Danfoss PN 25 Manuale di istruzioni - Pagina 5

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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

control and as a protection against excess

pressure in front of the valve. The controller

is used for water and water glycol mixtures

for heating, district heating and cooling

systems.

Controller is design-tested according to

DIN 4747 (SÜV) and the AGFW guidelines.

The technical parameters on the product

labels determine the use.

Disposal instruction

This product should be

dismantled and its

components sorted, if

possible, in various groups

before recycling or disposal.

Always follow the local disposal

regulations.

Assembly

Admissible Installation Positions ❶

Medium temperatures up to 100 °C:

- Can be installed in any position ①.

Medium temperatures > 100 °C:

- Installation permitted only in

horizontal pipelines with the actuator

oriented downwards ②.

Installation location and

Installation Scheme ❷

SAVA mounting

Secure the shut-off unit ① against

unauthorized opening.

73695100 DH-SMT/SI

Valve Installation ➌

1. Clean pipeline system prior to assembly.

2. Install a strainer in front of the

controller ①.

Max. mesh width

DN 15 - 25: 0.5 mm

DN 32 - 50: 0.8 mm

3. Install pressure indicators in front of and

behind the system part to be controlled.

4. Install valve

• The flow direction indicated on the

product label ② or on the valve ③

must be observed.

• The valve with mounted weld-on

tailpieces may only be spot welded to

the pipeline ④.

The weld-on tailpieces may be welded

only without the valve and seals! ⑤⑥

If these instructions are not observed,

high welding temperatures may

destroy the seals.

• Flanges ⑦ in the pipeline must be in

parallel position and sealing surfaces

must be clean and without any

damage.

Tighten screws in flanges crosswise

in 3 steps up to the maximum torque

(50 Nm).

5. Caution:

Mechanical loads of the valve body by the

pipelines are not permitted ⑧.

Insulation ➍

Do not insulate the pressure actuator ①.

Dimensions, Weights ❺

(See page 2)

Conical ext. thread acc. to EN 10226-1

Flanges PN 25, acc. to EN 1092-2

Start-up

❻

The valve is closed without pressure. The

valve opens when the pressure in front

of the valve ① rises above the adjusted

set-point.

Filling the system, first start-up

To avoid too high pressure differences

on the controller, observe the following

sequence when opening the shut-off

valves:

1. Release spring ⑤ by turning the set-

point adjuster ④.

2. Slowly open shut-off devices in the

return pipeline ②.

3. Slowly open shut-off devices in the

supply pipeline ③.

leak and Pressure Tests

To avoid inadmissible pressures on the

actuator (admissible excess pressure

during operation is 14 bar) it is absolutely

necessary to remove the impulse tube

VI.DC.F2.8M

⑥. Close connections with plugs G 1/8 ISO

228 ⑦. In this case valve is always closed.

Pressure must be gradually increased at

the +/- connection.

Non-compliance may cause damages at

the actuator or the valve.

A pressure test of the entire system

must be carried out in accordance with

manufacturer's instructions.

The maximum test pressure is: 1.5 × PN

PN - see product label!

Putting out of operation

1. Slowly close shut-off devices ③ in the

flow pipeline.

2. Slowly close shut-off devices ② in the

return pipeline.

Settings ❼

Pressure Setting

The pressure setting range is indicated on

the product label ①.

Procedure:

1. Start system, see section "Filling the

system, first start-up"

Completely open all shut-off devices in

the system.

2. Adjustment

(of the pressure in front of the valve)

Observe pressure indicators ②.

• Turning to the right ③ (clockwise)

increases the set-point (stressing the

spring).

• Turning to the left ④ (counter-

clockwise) reduces the set-point

(releasing the spring).

Seal ❽

The set-point adjuster can be sealed by a

seal wire ①, if necessary.

Safety function ❾

If the control diaphragm ① beaks, pressure

gets in the two intermediate chambers ②.

This pressure acts upon the safety

diaphragm ③ and causes the following:

- The valve opens

- The control function does not operate

- A slight water leakage at the threaded

joint ④ of the upper casing indicates a

break of the diaphragm

The controller must be replaced when the

diaphragm is broken.