Unical ELLPREX Series, Инструкция по установке, использованию и обслуживанию

Страница: 13 / 40

13
2.5.6 - SHUNT PUMP
The ELLPREX boilers must always operate in
forced circulation hot water systems and with
a minimum return temperature of 55 °C.
So, it is suggestable to adopt a shunt pump,
having also an anti-condensation purpose,
installed between the flow and return
connections, upstream an eventual 3 or 4 way
mixing valve.
This pump will be sized according to the
following formula:
Q = P x 22
where
Q
= Water flow rate in liter/h
P
= Boiler nominal output in kW
and the manometric head 1-2 m w.c.
2.6 - FURNACE DOOR:
ADJUSTMENT,
OPENING & CLOSING
2.6.1 - BOILERS “ELL 170
-
ELL 630”
For all these models the hinging and the fixing
of the door are made according the schema of
fig. 17.
In these cases the door is mounted with 4 hinges
of the same type: the two ones on the L.H. side,
with the shaft
A
inserted, are normally used
as rotating hinges (from Right to Left), whilst
the two ones on the R.H. side are used as door
support; the door is then blocked with four
screws.
Exactly the contrary will happen when the door
is hinged on the R.H. side and the door needs
to be opened from Left to Right.
To get the reversion of the opening it is
sufficient to move the shafts
A
on the opposite
side.
On the door of these models of boiler the
following adjustments are possible:
A
)
Adjustment in vertical way:
it is possible
only by introducing some washers of
convenient thickness under the hinge on
which the door rotates.
fig. 17
B
)
Adjustment in transversal way:
it is
possible by unscrewing and side moving
the hinges fixed to the front tube plate.
C
)
Adjustment in axial way:
it is possible by
screwing more or less the fixing screws.
2.6.2 - BOILERS “ELL 760 - ELL 970”
For all these models the hinging and the fixing
of the door are made according the schema of
fig. 18.
In these cases the two hinges on the L.H. side
are normally used as rotating hinges (from
Right to Left), whilst the two ones on the R.H.
side are used as closing hinges.
Exactly the contrary will happen when the door
is hinged on the R.H. side and the door needs
to be opened from Left to Right.
To get the reversion of the opening it is
sufficient to move the rear counternuts onto
the opposite side.
On the door of these models of boiler the
following adjustments are possible:
A
)
Adjustment in vertical way:
it is possible
by acting on the nut of the upper shaft of
the rotating hinge.
B
)
Adjustment in transversal way:
it is
possible by unscrewing and side moving
the hinges fixed to the front tube plate.
C
)
Adjustment in axial way:
it is possible by
screwing more or less the fixing screws.
fig. 18
The expansion pipe connects the C.H. system to
the expansion vessel.
This pipe which starts from the connecting
point T3 (see table DIMENSIONS), must have NO gate valve on it.