ADI CD Boiler – Technical Manual
49
17.7.4 Low Loss Header / Water manifold / Inertial
-
It avoids hydraulic unbalances between the circuits and the boilers.
-
It ensures a constant water flow to the boiler, independently from the
consumptions required. In accordance with current regulations.
-
In case of heavy sludge in the water, it drives it to the bottom of the tank. It
can not avoid lighter sludge.
It is necessary to install (2) an automatic air vent of big capacity in the higher
part of the tank, (3) an appropriate drainage with a diameter of 50/60, and
optionally, (1) a manual air vent with a diameter of 15/21.
Inertial volume
ADI CD
OPTION 1 (see text)
OPTION 2 (see text)
Nr. Boilers
1 boiler
2 boilers
3-4 boilers
1 boiler
2 boilers
3-4 boilers
ADI CD 70 - 105
20 lit.
30 lit.
40 lit.
40 lit.
60 lit.
75 lit.
ADI CD 120
30 lit.
40 lit.
65 lit.
50 lit.
100 lit.
125 lit.
ADI CD 175
35 lit.
75 lit.
125 lit.
80 lit.
150 lit.
200 lit.
ADI CD 200
35 lit.
50 lit.
75 lit.
50 lit.
75 lit.
125 lit.
ADI CD 250
35 lit.
50 lit.
75 lit.
80 lit.
100 lit.
175 lit.
ADI CD 325
50 lit.
75 lit.
100 lit.
100 lit.
175 lit.
250 lit.
ADI CD 375
50 lit.
100 lit.
150 lit.
100 lit.
200 lit.
300 lit.
ADI CD 450
75 lit.
150 lit.
250 lit.
150 lit.
300 lit.
375 lit.
ADI CD 550
100 lit.
175 lit.
300 lit.
150 lit.
350 lit.
500 lit.
ADI CD 650
125 lit.
250 lit.
400 lit.
175 lit.
400 lit.
600 lit.
ADI CD 750
150 lit.
300 lit.
500 lit.
200 lit.
500 lit.
800 lit.
ADI CD 850
175 lit.
350 lit.
500 lit.
250 lit.
700 lit.
1000 lit.
ADI CD 950
200 lit.
400 lit.
600 lit.
300 lit.
800 lit.
1200 lit.
This inertial volume may be distributed between (see system drawings in this document):
o
Water header / collectors linked by a by-pass (not closed) or one common water header / manifold.
o
Water pipes between header / collector and boilers.
OPTION 1:
Boiler cascade (for 2 or more boilers) managed by the boiler control:
o
Siemens LMS
o
Similar controller from another trademark with 0…10 V control signal (one signal per each boiler), to
control the cascade of several boilers.
Caution: when the consumption required is DHW instantaneous production (that means no DHW buffer vessel)
with quick and high consumption peaks
the inertial volume of Option 2 must be used.
OPTION 2:
-
No controller manages the boiler cascade (for 2 or more boilers at the same circuit).
-
Instantaneous DHW production.
Installations with a sufficient inertial volume and a constant water flow, without interruption.
These are installations where the main circuit/s has/have a minimum water capacity ensuring a constant and
uninterrupted water flow to the boilers (unless the boilers stop). For example:
-
Heating circuits with a main loop to which are connected A.H.U., fan-coils, where there are the control
el valves. This loop will have enough water capacity to ensure a constant water flow to the boilers.
-
Renovation of old boilers rooms (previously located in the basement) which have been moved to the top of
the building or terrace, where the flow and the return piping connecting the new boilers room to the old one
have a sufficient water capacity to guarantee a constant water flow, without interruption, through the boiler.
See system drawings.
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