22
3.5.1
Head with total rate of flow
to other zones
In
“DEWY 30/130 HE FS”
versions using
the second and third zone kit, determine
the head available to the zones as shown in
the following example:
Rate of flow calculated for zone 1 = 350 l/h
Rate of flow calculated for zone 2 = 400 l/h
Rate of flow calculated for zone 3 = 400 l/h
To obtain head available to zone 1, add the
total rate of flow to the other zones (in this
case zones 2 and 3): 400 l/h + 400 l/h =
800 l/h.
As shown in the graph (fig. 18/a) at the
800 l/h curve, head at 350 l/h for zone 1
= 180 mbar.
The same procedure may be applied to
other zones to obtain:
Zone 2 = 350 l/h + 400 l/h = 750 l/h.
As shown in the graph at the 800 l/h
curve, head at 400 l/h = 160 mbar.
Zone 3 = 350 l/h + 400 l/h = 750 l/h.
As shown in the graph at the 800 l/y
curve (curve E), head at 400 l/h = 160
mbar.
3.6
SMOKE
STAT
To ensure an effective protection of the flue
from becoming damaged from excessive
heat, the boiler is supplied with a standard
smoke thermostat (37 Fig. 3).
0
200
1600
1400
1200
1000
800
600
400
PORTATA (l/h)
PREV
ALENZA RESIDU
A (mbar)
500
400
100
200
300
A
DEWY 30/1
30
B
C
D
E
A= 0 l/h
D= 600 l/h
B= 200 l/h E= 800 l/h
C= 400 l/h
Fig. 18/a
3 HIGH TEMPERATURE ZONES
FLOW RATE (l/h)
RESIDU
AL
HEAD (mbar)
