Danfoss AVP-F (Generation 2006) User Manual

Page 5

73695010 DH-SMT/SI

VI.DB.N3.8I

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 of water and water glycol mixtures

for heating, district heating and cooling

systems.

The technical parameters on the product

labels determine the use.

Assembly

Admissible Installation Positions ❶

Medium temperatures up to 100 °C ①:

- Can by installed in any position.

Medium temperatures > 100 °C ②:

- Installation permitted only in

horizontal pipelines with the

actuator oriented downwards.

Installation location and

Installation scheme ❷

AVP (-F) return mounting ①
AVP (-F) flow mounting ②

Valve Installation ❸

1. Clean pipeline system prior to assembly.
2. The installation of a strainer in

front of the controller is strongly

recommended ①.

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

spotwelded to the pipeline ④.

The weld-on tailpieces may be welded

only without the valve and seals! ⑤

⑥

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.

Impulse tube and seal pot mounting

• Which impulse tubes to use?

❹

Use Impulse tube set AV ① or

use following pipe:

Copper Ш 6 Ч 1 mm EN 12449

• Connection of impulse tube and seal pot

③

in the system

❺

- Return mounting ①

- Flow mounting ②

• Connection to the pipeline ❻

It is strongly recommended to install the

impulse tube to the pipeline horizontally
①

or upwards ②.

This prevents dirt accumulation in the

impulse tube and possible malfunction

of the controller.

Connection downwards is not

recommendable ③.

• Impulse Tube Mounting ❼

1. Cut pipe perpendicularly to the pipe

axis and smooth edges out ①.

2. Press impulse tube ② into the

threaded joint up to its stop.

3. Tighten union nut ③ Torque 14 Nm

Insulation ❽

For medium temperatures up to 100 °C the

pressure actuator ① may also be insulated.

Dimensions, Weights

❾

(See page 2)

Conical ext. thread acc. to EN 10226-1

Flanges PN 25, acc. to EN 1092-2

Other flange dimensions - see table for

tailpieces.

start-up

❿

Filling the system, first start-up

1. Slowly open shut-off devices ① in the

flow pipeline.

2. Slowly open shut-off devices ② in the

return pipeline.

3. Slowly open shut-off devices ③ in the

flow pipeline.

4. Slowly open shut-off devices ④ in the

return pipeline.

leak and Pressure Tests

Pressure must be gradually increased at

the +/- connection ⑤.

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 ④ in the

return pipeline.

settings

Differential Pressure setting

⓫

(not relevant at fixed setting version AVP-F)
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. Set flow rate on a motorised valve ②, on

which differential pressure is controlled,

to about 50 %.

3. Adjustment

Observe pressure indicators ③ or/and

alternatively see handle scale indication.

Turning to the right (clockwise) ④

increases the set-point (stressing the

spring).

Turning to the left (counter clockwise)
⑤

reduces the set-point (releasing the

spring).

If the required differential pressure is not

attained, a cause may be a too small

pressure loss in the system.

seal

⓬

The set-point adjuster can be sealed by a

seal wire ①, if necessary.

ENglIsh