Danfoss USV-M - Manual (Page 3)

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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.
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 External thread
DN 15 Rp 1/2 G 3/4 A
DN 20 Rp 3/4 G 1 A
DN 25 Rp 1 G 1 1/4 A
DN 32 Rp 1 1/4 G 1 1/2 A
DN 40 Rp 1 1/2 G 1 3/4 A
DN 50 Rp 2 G 2 1/4 A
Installation Guide USV-I / USV-M
Heating Solutions VI.C1.D4.1Z SMT/SI
LANGUAGE ENGLISH