- 11 -
TECHNICAL SPECIFICATIONS
5 - CIRCULATING PUMP CHARACTERISTICS
The circulating pump is equipped with a 3-speed
motor with a 85 W (0.11 HP) maximum power input.
The heating pump’s power consumption can be si-
gnificantly optimised by adapting its speed to the re-
quirements of the installation and by using the
control devices that are offered as options
6 - MIXING VALVE CHARACTERISTICS
7 - CHARACTERISTICS OF THE EXPANSION VESSEL
FCX boilers are pre-equipped with an expansion
vessel for an installation water capacity of approxi-
mately 62 liters (16 gal) .(section 8.2 - page 26 -
chapter V - INSTALLATION)
The expansion vessel absorbs the increase in the
water volume in the installation produced by the in-
crease in temperature. The pre-inflation of the ves-
sel sends the internal membrane to the side of the
connection and the water dilation pushes on this
membrane. Optimum efficiency is obtained when
the inflation pressure is equal to the water pressure.
Note:
- The minimum water pressure necessary for the
correct working of the installation is defined by
the difference in levels between the boiler and the
highest point in the installation [ex : 8 m = 0,8 bar
(26ft=11.6 Psi)].
Fig. 3
0
0
5
10
15
20
25
30
35
T
o
ta
l He
a
d
in
F
e
e
t
Capacity in U.S. GPM
2
1
2
3
4
6
8
10
15
20
25
30
35
40
45
50
HP range
1/25, 1/12, 1/6
230°F Maximum
50°F Minimum
10-46 GPM
Fluid temp
Flow Range
FC
X
-6
5
-U
1
10
100
1000
10000
100
1000
10000
Flow (l/h)
Pressure drop
(m
b
a
r)
100%
90%
80%
70%
60%
50%
40%
30%
10%
20%
1
3
5
7
10
Setting button position
% Hot water
Fig. 4
H
Water inlet
Dilated water
volume
Inflating
valve
Pressure rises
as the air is
compressed
Max vessel
volume
Membrane
AM
4
-0
6
-3
Fig. 5
