Unigas P20, Installation, Operation And Maintanance Manual, Page: 16 / 52

PART I: INSTALLATION 16
SETTINGS
WARNING!
THE SEALED SCREWS MUST NOT BE UNLOOSED!
IN A SUCH CASE THE DEVICE WARRANTY IS IMMEDIATELY INVALIDATE!
Fig. 27 - Multibloc MB-DLE - VPS504
The multibloc unit is a compact unit consisting of two valves, gas
pressure switch, pressure stabilizer and gas filter.
It can be paired jointly to the Dungs VPS504 sealing controls.
The gas flow rate is adjusted by means of the RP regulator after
slackening the locking screw VB by a number of turns. By
unscrewing the regulator RP the flow increases and screwing it is
reduced.
Tight the screw VB after settings.
To set the fast opening remove cover T, reverse it upside down
and use it as a tool to rotate screw VR. Screw to reduce the star-
tup flow rate, unscrew to increase it.
Do not use a screwdriver on the screw VR!
The pressure governor is adjusted by operating the screw VS
located under the cover C. By screwing down the pressure is
increased and by unscrewing it is reduced.
Note: the screw VSB must be removed only in case of repla-
cemente of the coil.
Leakage control device VPS504 (Optional)
The VPS504 check the operation of the seal of the gas shut off
valves costituting the MB-DLE. This check, carried out as soon
as the boiler thermostat gives a start signal to the burner, crea-
tes, by means of the diaphragm pump inside it, a pressure in the
test space of 20 mbar higher than the supply pressure. When
wishing to monitor the test, install a pressure gauge ranged to
that of the pressure supply point PA. If the test cycle is sati-
sfactory, after a few seconds the consent light LC (yellow) comes
on. In the opposite case the lockout light LB (red) comes on.
To restart it is necessary to reset the appliance by pressing the
illuminated pushbutton LB.
.
Fig. 27
Gas valve Dungs MV- DLE
!
To adjust the gas flow rate loosen the screw VB and rotate the
regulator RP as necessary. Flow decreases sccrewing and
increases unscrewing.
!
Tighten the screw VB.
!
To set the fast opening remove the cover T, reverse it upside
down and use it as a tool to rotate the screw VR. Clockwise
rotation reduces the ignition flow rate, anticlockwise rotation
increase it.
Note: the screw VSB must be removed only in case of repla-
cemente of the coil.
Do not use a screwdriver on the screw VR!
Fig. 28
C VS T(VR)
RP
LC LB
PA
VB
VSB
T
VR
RP
VSB
VB