Danfoss VFQ 2 21 Betriebshandbuch - Seite 8

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AFPQ (4) / VFQ 2(1)

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 flow rate limitation

and differential pressure control of water and

water glycol mixtures for heating, district

heating and cooling systems.

The technical data on the rating plates

determine the use.

Scope of Delivery

❶

Accessory, for connection to flow supply and return flow

Assembly

Admissible Installation Positions

DN 15-80

media temperatures up to 120 °C:

Can be installed in any position.

DN 100–250 all temperatures and DN 15-80

media temperatures > 120 °C:

Installation only permitted in horizontal

pipelines with the actuator hanging

downwards.

Installation Location and

Installation Scheme

❸

AFPQ/VFQ 2(1) return flow mounting

AFPQ 4/VFQ 2(1) supply flow mounting

Valve Installation

❹

1. Install strainer ① before the controller.

2. Rinse system prior to installing the valve.

3. Observe flow direction ② on the 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 and Actuator Mounting

1. Place actuator at the valve.

2. Align actuator, observe position of impulse

tube connection ①.

3. Tighten union nut ② Torque 100 Nm

Impulse Tube Mounting

Overview

③ Mounting of impulse tube set

④ Connection for copper impulse tubes

8 | © Danfoss | 2022.12

Procedure ❻

1. Remove plug ① at the valve.

For AFPQ 4 remove plug ② in addition

2. Screw in threaded joint ③ with copper

seal ④. Torque: 40 Nm

3. Verify the correct position of the cutting

ring ⑤.

4. DN 150/250 screw angle ⑥ to the valve.

5. Screws angle to the pressure actuator.

⑦ AFPQ

AFPQ 4 ❼ ① Mount two angles.

For DN150-250, screw additional angle ②.

6. Press impulse tube ⑤ into the threaded joint

up to its stop.

7. Tighten union nut ④

Torque 40 Nm

Impulse Tube Mounting to Supply

Flow AFPQ

Return Flow AFPQ 4

Note

When installing seal pots ①, please observe the Installation In-

structions for the seal pots.

Which impulse tubes to use?

Use impulse tube set AF (1x) ②

Order No.: 003G1391 or use the following pipes:

Pipe

Stainless steel

DIN 17458, DIN 2391

Steel DIN 2391

Copper DIN 1754

❷

Connection of impulse tube ③ in the system

Return flow mounting ④

Supply flow mounting ⑤

Connection to the pipeline ➒ ①

No connection downwards ②, could become

dirty.

Impulse Tube Mounting (Copper)

1. Cut pipe into rectangular sections ③ and

burr.

2. Insert sleeves ④ on both sides.

3. Verify the correct position of the cutting

ring ⑤ .

4. Press impulse tube ⑥ into the threaded

joint up to its stop.

5. Tighten union nut ⑦. Torque 40 Nm

Insulation

❿

For media temperatures up to 120 °C

the pressure actuator ① may also be

insulated.

Dismounting

Danger

Danger of injury by hot water!

Valve without actuator is open ①,

❺

seal ② is in the actuator.

Prior to dismounting depressurize system!

Carry out dismounting in reverse order to

mounting.

➑

Ø 10×0,8

Ø 10×1

⓫

Leak and Pressure Tests

Pressure must be increased slowly at

the +/– connec tion ① until the max

testing pressure is reached.

Non-compliance may cause damages at the

actuator or valve.

Max. test pressure [bar] with connected

impulse tu bes: 25 bar

In case of higher test pressu res, remove impulse

tubes at the pipeline ② and at the valve ③.

Close connections with plugs G ¼ ISO 228.

Observe nominal pressure ④ of the valve.

Max. test pres sure is 1,5 x PN

Filling the System, First Start-up

The return flow pressure ① must not

exceed the supply flow pressure ②.

Non-compliance may cause

damages at the controller.

1. Open shut-off valve ③ that is possibly

available in the impulse tube.

2. Open valves ④ 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.

Set-point Setting

First set the differential pressure ⓮①.

Set-point range see rating plate ⓮②.

Differential Pressure Setting

1. Start system, see section "First Start-up"

Completely open all shut-off devices in the

system.

2. Set flow rate to about 50 % ① & ②.

3. Adjustment

Observe pressure indicators ③.

Turning clockwise ④ increases the set-point

(stressing the spring).

Turning counterclockwise ⑤ reduces the set-

point (un-stressing the spring).

The set-point adjuster ⑥ may be sealed.

Adjustment of Flow Rate Limitation

The flow rate is limited by adjusting the stroke

of the adjusting throttle.

There are two options:

1. Adjustment with the flow adjusting curves,

only DN 15-125 ⓰

remove the cap ①

Untighten the counter nut ②

Turning clokwise, fully close the flow limiter

③

Turning counter clockwise, set the flow ④

limitation according to the table.

Tighten the counter nut ⑤

Tighten the cap ⑥

2. Adjustment with heat meter, see step 2, ⓱.

Untighten the counter nut ①

Increase maximum flow limitation ②

AQ00008644697902-000301

⓬

⓭

⓯