Danfoss USV-I Manuel d'installation - Page 3

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Installation Guide

LANGUAGE

ENGLISH

Presetting valve USV-I is used together

with shut-off upgradeable valve USV-M to

balance the flow in heating installations.

After upgrading with PV controller, USV-M

becomes an automatic balancing valve.

Function

USV-I gives maximum limitation of water

flow and the riser can be shut off by

turning the knob fully clockwise.

USV-M can shut-off the riser by turning the

knob fully clockwise.

USV-M (after upgrading to USV-PV)

regulates together with USV-I the

differential pressure and flow across the

riser to the preset value.

Data

Max. working pressure ............................16 bar

Max. differential pressure

across the valve ........................................ 80 kPa

Max. flow temperature............................120 °C

Max. test pressure .....................................25 bar

Installation

USV-I must be installed in the flow pipe

and USV-M must be installed in the return

pipe. The direction of the flow must be

according to the arrow on the valve body.

It is recommended that an FV-filter is

installed in the supply pipe.

The valve must in addition be installed as

determined by installation conditions.

Measurment of flow

Measuring connector (accessory) can be

fitted to the drain cock, and the differential

pressure and flow across the valve can be

measured using ordinary equipment, by

doing the following:

• When the quick couplings on the

measuring instrument are connected,

turn the measuring nipple one turn

counterclockwise and open the drain

cock

• Using the graph ❺ the actual diffential

pressure across the valve can be

converted to actual flow.

• Close the measuring nipple and drain

cock again, before removing the quick

couplings.

Note: When measuring sized flow, all

radiator valves mus be fully open.

Heating Solutions

USV-I / USV-M

Setting

To preset the valve:

• Turn the valve knob to the required

setting ❻.

• Hold the knob to keep the setting, use a

hexagon seocket key to turn the spindle

fully counterclockwise (until a stop can

be felt) ➐.

• Turn the valve knob fully counterdclock-

wise, so that the mark on the knob is

opposite "0" on the scale ❽. The valve

is now open as many turns as required.

Resetting

To reset the setting, hold the knob and

turn the spindle fully clockwise (until a

stop can be felt) ❾.

Check the setting

Close the valve by turning the valve knob

fully clockwise and read the setting on the

scale ❻.

Fault location

Check the following if the riser valve does

not function correctly:

1. Is the flow direction through the valve

correct?

2. Is the USV-I valve open?

Insulation

The styropor packaging (accessories)

can be used as an insulation jacket for

temperature up to 120 °C.

Valve size

Internal thread

DN 15

Rp 1/2

DN 20

Rp 3/4

DN 25

Rp 1

DN 32

Rp 1 1/4

DN 40

Rp 1 1/2

DN 50

Rp 2

VI.C1.D4.1Z

External thread

G 3/4 A

G 1 A

G 1 1/4 A

G 1 1/2 A

G 1 3/4 A

G 2 1/4 A

3 3

SMT/SI